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Combination bronchodilator therapy in the management of chronic obstructive pulmonary disease
Respiratory Researchvolume 14, Article number: 49 (2013)
Chronic obstructive pulmonary disease (COPD) represents a significant cause of global morbidity and mortality, with a substantial economic impact. Recent changes in the Global initiative for chronic Obstructive Lung Disease (GOLD) guidance refined the classification of patients for treatment using a combination of spirometry, assessment of symptoms, and/or frequency of exacerbations. The aim of treatment remains to reduce existing symptoms while decreasing the risk of future adverse health events. Long-acting bronchodilators are the mainstay of therapy due to their proven efficacy. GOLD guidelines recommend combining long-acting bronchodilators with differing mechanisms of action if the control of COPD is insufficient with monotherapy, and recent years have seen growing interest in the additional benefits that combination of long-acting muscarinic antagonists (LAMAs), typified by tiotropium, with long-acting β2-agonists (LABAs), such as formoterol and salmeterol. Most studies have examined free combinations of currently available LAMAs and LABAs, broadly showing a benefit in terms of lung function and other patient-reported outcomes, although evidence is limited at present. Several once- or twice-daily fixed-dose LAMA/LABA combinations are under development, most involving newly developed monotherapy components. This review outlines the existing data for LAMA/LABA combinations in the treatment of COPD, summarizes the ongoing trials, and considers the evidence required to inform the role of LAMA/LABA combinations in treatment of this disease.
Currently the fourth leading cause of death globally , chronic obstructive pulmonary disease (COPD) is a major cause of morbidity and mortality, projected to become the world’s third leading cause of mortality by 2020 . Characterized by progressive airflow limitation, COPD also has a major economic impact, contributing to US$53.7 billion in related direct costs in 2008 in the US .
As an area of interest for physicians, and a logical progression from monotherapy for those seeking to further improve outcomes in patients with respiratory disease, the subject of combined bronchodilation with bronchodilators of differing modes of action has been discussed in the literature previously [4–8]. The aim of this review is to focus more specifically on the combination of long-acting muscarinic antagonists (LAMAs) and long-acting β2-agonists (LABAs) for the treatment of COPD, summarizing data from recent peer-reviewed publications and published abstracts.
Evolving COPD guidelines
2011 saw a substantial revision of the Global initiative for chronic Obstructive Lung Disease (GOLD) guidelines for diagnosis, management, and prevention of COPD, which has recently been updated . Recommendations for treatment are no longer based primarily on categorization (“staging”) by spirometric assessment, but on categorization by existing symptoms (using validated modified Medical Research Council and COPD Assessment Test questionnaires) and risk (based on severity of airflow limitation and history of exacerbations). This approach acknowledges the importance of consideration of both short- and long-term outcomes when making treatment decisions (Figure 1) .
Long-acting bronchodilators: the cornerstone of COPD maintenance therapy
Two key classes of bronchodilators have been developed in COPD: β2-agonists and muscarinic antagonists. Short-acting bronchodilators, such as ipratropium, albuterol, and metaproterenol, have formed the cornerstone of initial COPD therapy for the past two decades [9, 10]. Subsequently, long-acting bronchodilators were developed. The twice-daily LABAs salmeterol and formoterol first became available for maintenance therapy of COPD more than 15 years ago, while the once-daily LAMA tiotropium has been available for 10 years and is the most widely prescribed maintenance monotherapy bronchodilator in COPD . Inhaled bronchodilators, as monotherapy or in combination, remain the mainstay for patients in all categories (Table 1) . Long-acting bronchodilators, such as tiotropium, formoterol, and salmeterol, are proven to provide long-term improvements in lung function, quality of life, and exacerbations in patients with COPD [12–14]. Long-acting bronchodilators (e.g., tiotropium, salmeterol) also reduce lung hyperinflation and dyspnea, and increase exercise endurance [15, 16], although a recent review suggested further data are required on the benefits of long-acting bronchodilators on exercise tolerance . There are a variety of long-acting bronchodilators available (Table 2) [18–34]. The once-daily LABA indacaterol, the once-daily LAMA glycopyrronium, and twice-daily LAMA aclidinium represent newer, recently licensed therapies, and there are also several once-daily LABAs and LAMAs in development, including olodaterol, vilanterol, and glycopyrrolate (Table 2).
Combination bronchodilation: rationale
Guidelines recommend combination therapy involving two long-acting bronchodilators with differing modes of action in patients whose COPD is not sufficiently controlled with monotherapy (Table 1) . The mechanistic rationale for combination of a muscarinic antagonist and a β2-agonist has been reviewed in detail recently [35, 36]; as such, we will only briefly discuss it here. Airway smooth muscle relaxation (leading to bronchodilation) can be achieved via two main routes: inhibition of acetylcholine signaling via muscarinic M3 receptors on airway smooth muscle with a muscarinic antagonist, or stimulation of β2-adrenoceptors with a β2-agonist [35, 36]. Targeting these two mechanisms of bronchoconstriction, theoretically, has the potential to maximize the bronchodilator response without increasing the dose of either component, and helps to overcome the inter- and intra-patient variability in response to individual agents seen in COPD . The interaction between the two systems has yet to be fully elucidated; however, β2-agonists can amplify the bronchial smooth muscle relaxation directly induced by the muscarinic antagonist by decreasing the release of acetylcholine via modulation of cholinergic neurotransmission. Additionally, muscarinic antagonists have been demonstrated to augment β2-agonist-stimulated bronchodilation by reducing the bronchoconstrictor effects of acetylcholine in preclinical models .
The rationale for improved bronchodilation has been tested in preclinical models with a specific investigational LAMA/LABA combination, tiotropium plus olodaterol, demonstrating synergistic effects on bronchoprotection in vivo[37, 38]. Combination treatment in ovalbumin-induced bronchoconstriction in anesthetized guinea pigs has demonstrated improved bronchoprotection in a dose-dependent manner, with effective dose (ED) 50 values 10-fold lower than the ED50 of olodaterol alone (p < 0.05) ; similar results were reported versus tiotropium monotherapy in acetylcholine-induced bronchoconstriction in anesthetized dogs . Indacaterol synergistically potentiates the effects of glycopyrronium to inhibit metacholine-induced contraction of airway smooth muscle in vitro. However, specifically designed clinical studies are required to assess whether such synergistic effects can be observed with therapeutic doses in humans.
Combination bronchodilation: existing evidence and ongoing studies
Short-acting muscarinic antagonist plus short-acting β2-agonist
The concept of adding a muscarinic antagonist to a β2-agonist is by no means new. A fixed-dose combination (FDC) of the short-acting agents ipratropium and albuterol (Combivent®) and of fenoterol and ipratropium (Berodual®) clearly provides benefits over monotherapy with either component [40–42]. Additionally, dual bronchodilation with ipratropium and albuterol resulted in a consistently longer response and more patients achieved a pre-specified response level (12-15%) in forced expiratory volume in 1 second (FEV1) with the combination versus individual components (p < 0.05) [40, 41, 43–45], with an equivalent or improved safety profile.
Free combinations of LAMA plus LABA
Relatively few studies have examined the combination of LAMAs and LABAs. Until recently, research focused on free combinations of existing therapies, and has demonstrated benefits on lung function and other outcomes (Table 3) [46–69].
Following proof of concept in terms of a benefit on FEV1 and in patients with acute exacerbations [70–72], several randomized controlled trials have reported improved lung function for tiotropium plus formoterol versus tiotropium alone [54–56, 60, 65, 73]. Some trials have also identified significant improvements in symptom scores [55, 56, 60] and reductions in rescue medication use [47, 49, 55, 56, 65]. A recent meta-analysis confirmed the benefits of tiotropium plus formoterol on average FEV1, trough FEV1, and Transition Dyspnea Index (TDI)  (Table 3), with initial reports also suggesting that the combination may provide statistically significant improvements in effort-induced dynamic hyperinflation and exercise tolerance .
Currently available data on tiotropium plus salmeterol are conflicting. Initial investigations indicated the benefits of tiotropium plus salmeterol versus either monotherapy alone, while suggesting co-administration of once-daily salmeterol plus tiotropium was inadvisable, due to the shorter duration of bronchodilation provided by salmeterol . The Canadian Optimal Therapy of COPD trial investigated the impact of tiotropium plus placebo, tiotropium plus salmeterol, or tiotropium plus salmeterol/fluticasone on clinical outcomes in 449 patients with moderate to severe COPD . Tiotropium plus salmeterol/fluticasone (but not tiotropium plus salmeterol) statistically improved lung function and quality of life, and, while no improvement in overall exacerbation rate was seen, reduced the number of hospitalizations for exacerbations compared to tiotropium plus placebo  (Table 3). A more recent study, however, demonstrated significant improvements in FEV1 with salmeterol once or twice daily plus tiotropium , and the combination was also associated with clinically significant improvements in TDI (Table 3). These inconclusive data suggest that further research is necessary to determine any advantage of salmeterol plus tiotropium. Initial investigation of other free combinations has also been reported (Table 3); tiotropium plus indacaterol has been demonstrated to improve lung function and inspiratory capacity, as well as providing a further reduction in use of rescue medication . The LAMA GSK233705 twice daily plus salmeterol has also demonstrated significantly improved trough FEV1 from baseline compared to monotherapy . Overall, these data broadly confirm that combination therapy has the potential to improve outcomes versus monotherapy and justify further research in this area.
Fixed-dose combinations (FDCs)
FDCs of LAMAs and LABAs offer the potential of improved convenience and compliance over use of separate inhalers, and, during their development, the dose of each agent to be used in combination can be optimized.
A major challenge associated with development of an FDC is provision of improved bronchodilation over monotherapy components while balancing the associated adverse effects . Dose-finding studies are required to establish minimal effective doses for each agent in the combination, as it cannot be assumed that these doses are the same as would be used in monotherapy. Regulatory bodies also require investigation into any pharmacodynamic or pharmacokinetic interactions that may occur between the constituents, along with evidence of the safety profile for the combination [77, 78].
A number of FDCs are in development, with substantial clinical programs (Table 4), and some Phase II/III results are available (Table 3). In all cases, there is evidence of improved lung function parameters with the combinations versus monotherapy components. Glycopyrrolate/glycopyrronium is being developed as part of two combinations: the former plus formoterol as a twice-daily combination (Pearl Therapeutics) and the latter plus indacaterol as a once-daily combination (Novartis). Glycopyrrolate plus formoterol has recently reported improvements in FEV1 area under the curve from 0–12 hours (AUC0-12) versus monotherapy with glycopyrrolate, formoterol, or tiotropium , and in inspiratory capacity versus tiotropium monotherapy  (Table 3). Indacaterol is approved at doses of 150 and 300 μg in the EU, and 75 μg in the US . Early studies investigated high doses of indacaterol in combination with glycopyrronium [57, 58], but the recent SHINE, ILLUMINATE, and ENLIGHTEN studies have examined the effects of indacaterol (110 μg) plus glycopyrronium (50 μg) (Table 3). The SHINE study reported significantly greater improvements in trough FEV1 after 26 weeks’ treatment with the combination compared to monotherapy with indacaterol (mean difference 70 mL), glycopyrronium (90 mL), or tiotropium (80 mL) . This study also demonstrated improvements in dyspnea (versus placebo and tiotropium), St George’s Respiratory Questionnaire (versus placebo), and reduced use of rescue medication (versus placebo and all monotherapies). The ILLUMINATE study has provided interesting information on the relative effects on lung function of a LABA/LAMA combination versus LABA/inhaled corticosteroids (ICS): significant, sustained, and clinically meaningful improvements in trough FEV1, peak FEV1, and FEV1 AUC0-12 with indacaterol plus glycopyrronium versus the LABA/ICS salmeterol/fluticasone (p < 0.001 for all comparisons) . Mean treatment difference for indacaterol plus glycopyrronium versus salmeterol/fluticasone ranged from 103 mL (trough FEV1) to 155 mL (peak FEV1) . Additionally, the longer-term ENLIGHTEN study reported significant improvements in lung function with the combination versus placebo sustained for 52 weeks, with no evidence of tachyphylaxis .
Clinical Phase II trials have investigated the optimal dosing for olodaterol added to a fixed dose of tiotropium  and for tiotropium added to a fixed dose of olodaterol . Significant improvements in peak FEV1 were demonstrated with tiotropium/olodaterol 5/2 μg (p = 0.008), 5/5 μg (p = 0.012), and 5/10 μg (p < 0.0001) versus tiotropium monotherapy . Significant improvements were also seen in trough FEV1 with tiotropium/olodaterol 5/10 μg versus tiotropium monotherapy (p = 0.034) , and with all doses of the combination tested versus olodaterol monotherapy, with evidence of dose ordering  (Table 3).
There is little information available from studies of aclidinium plus formoterol; only initial results of preclinical cardiac safety in beagle dogs have been reported .
Of the LAMA/LABA FDCs currently under investigation, tiotropium plus olodaterol, umeclidinium plus vilanterol, aclidinium plus formoterol, and glycopyrronium plus indacaterol have the largest Phase III programs, focusing on efficacy, safety, exacerbations, exercise, and dyspnea (Table 4). The development program for umeclidinium plus vilanterol involves four large pivotal trials, one large safety study, and two studies assessing exercise endurance, with two ongoing trials investigating lung function and efficacy. Phase III studies of glycopyrronium plus indacaterol will compare the combination with a range of comparators, including fluticasone/salmeterol combination and tiotropium, across a variety of end points (FEV1, exacerbations, TDI, and safety). The tiotropium plus olodaterol development program includes two main registration trials, three examining exercise and functional capacity, one examining long-term safety, and a comprehensive lung function trial.
Several of the LAMA/LABA FDCs in development will be delivered once daily (such as umeclidinium plus vilanterol and tiotropium plus olodaterol) while others will have twice-daily dosing (e.g., aclidinium plus formoterol). This diversity has the potential to increase the personalization of medication to individual needs; for instance, twice-daily combinations could be considered where patients suffer from night-time symptoms , while once-daily combinations may be prescribed to improve adherence .
Inhalation devices are intrinsically linked to the medication they deliver. As such, careful consideration of the most appropriate delivery device is crucial to optimal COPD therapy, along with adequate training and observation of patient technique.
The new devices currently in development for delivery of combination inhaled LAMA/LABAs for COPD fall into three main classes: pressurized metered dose inhalers (pMDIs), dry powder inhalers (DPIs), and a propellant-free Soft Mist™ Inhaler (SMI), each with its own advantages and disadvantages (Table 5) [83–93]. Poor inhaler technique is often a main cause of sub-optimal COPD management ; determining a suitable delivery device that each individual patient will be able to use can help to ensure adequate disease management. For instance, a spacer or holding chamber can be used to improve drug delivery via pMDIs in patients with poor coordination between actuation and inhalation. DPIs were designed to ease operation compared to pMDIs . However, it remains important to provide patient training on the specific DPI, as confusion can arise regarding the differing loading techniques for individual devices (e.g., self-contained reservoirs or blister packs versus capsule insertion). Additionally, a higher inspiratory flow is required to operate this type of inhaler, meaning that it may not be appropriate for patients with very severe COPD [94, 95]. The increased aerosol production time provided by an SMI (1.5 seconds compared to <0.5 seconds for most other inhalers) may be an advantage for patients with low inspiratory capacity or poor timing of inhalation to actuation, although teaching and observing the patient’s technique remains important .
Non-adherence is a well-documented issue in COPD and is associated with detrimental effects on patient outcomes [96, 97]. Irrespective of the device type, a single device with once-daily dosing may provide a significant advantage, potentially improving adherence and, therefore, patient outcomes. Adherence is inversely related to the number of medications patients take  and both treatment persistence and adherence in patients with COPD have been demonstrated to be lower in multiple long-acting inhaler users, compared to single long-acting inhaler users . Additionally, a recent large retrospective study reported that adherence was significantly higher in those who initiated treatment with once-daily dosing versus more frequent dosing . On the other hand, apart from the possible advantage of once- over twice-daily dosing on adherence, a twice-daily preparation has the potential advantage of greater improvement in night-time airflow and symptoms, an issue that has recently been reappraised .
Consideration of potential adverse effects of LAMA/LABA combinations
The safety profiles of both LAMAs and LABAs are well understood. However, when combining two entities, it is important to understand both the similarities and differences in adverse events. Given that both muscarinic antagonists and β2-agonists can have a detrimental effect on the cardiovascular system [26, 99], these adverse events need to be monitored carefully in development programs for combination products. Initial results suggest that the cardiovascular safety profile of glycopyrronium plus indacaterol is similar to placebo, with no clinically significant differences observed versus placebo [57, 68], and, to date, no safety concerns have been identified with tiotropium plus olodaterol . Free combinations of LAMA/LABA also seem well tolerated. No differences in blood pressure and pulse rate were observed with tiotropium plus salmeterol versus single-agent therapies  and the meta-analysis of tiotropium plus formoterol data reported no differences in cumulative incidence of adverse events for the combination (33.2%) versus tiotropium alone (36.0%), stating that drug-related severe adverse events and cardiac effects were relatively rare .
Emerging therapeutic approaches
Triple therapy with LAMA plus LABA/ICS has also been investigated, demonstrating benefits over monotherapy on lung function [48, 100–102]. Additionally, a pilot study of patients with advanced COPD reported that triple therapy combined with pulmonary rehabilitation provided a benefit in terms of lung function . Some reports also suggest that triple therapy can provide additional benefits, such as reduction in exacerbation rate and mortality , although a recent systematic review concluded that further, longer-term studies are required to determine the benefits of tiotropium plus LABA and ICS , or the additional benefit of ICS on top of LAMA/LABA combinations.
Dual muscarinic antagonist-β2-agonists (MABAs)
Another interesting concept is that of single molecules with muscarinic antagonist-β2-agonist (MABA) activity. While the prospect of combining muscarinic antagonism and β2-agonism into one entity is highly attractive, this is a new and challenging area of research . The optimal MABA should be designed to achieve balanced, high potencies at both muscarinic and β2 receptors, for consistency. The furthest developed MABA is GSK961081, which has demonstrated effective bronchoprotection in vivo as proof of concept (NCT00478738)  and is currently in Phase IIb studies. MABAs provide a fixed ratio of muscarinic antagonist and β2-agonist activity at a cellular level, have a single pharmacokinetic profile, and deliver a fixed ratio of muscarinic antagonist and β2-agonist to the whole lung, simplifying both combination delivery device and clinical development programs [4, 5, 107]. These properties suggest that MABAs have the potential to act as a useful platform for triple therapy with an anti-inflammatory agent.
A number of new bronchodilators with novel modes of action are currently in early stages of development, including K+ channel openers, Rho kinase inhibitors, and analogs of vasoactive intestinal peptide; these have been reviewed more extensively elsewhere . Given the substantial evidence supporting a role of Rho kinase in bronchoconstriction , Rho kinase inhibitors such as Y-27632, Y-30141, Y-30694, and fasudil may currently hold the most promise, demonstrating smooth muscle relaxant properties in vitro. Once further evidence of efficacy and safety is available, these newer classes might be used in combination with more conventional bronchodilators, leading to additional therapeutic options and increased potential for individualized medication.
In summary, there is considerable evidence and guidance to support use of the combination of a LAMA and a LABA in COPD, a number of free LAMA and LABA combinations have been studied, and several LABA/LAMA FDCs are under development.
Although there is a clear rationale for the use of LAMA and LABA combinations, a recent treatment regimen analysis for patients with COPD (based on prescription and medical claims) suggests that currently this free combination is utilized much less frequently than LAMA monotherapy (tiotropium), LABA/ICS combinations, and the triple combination of LAMA plus LABA/ICS in clinical practice (Table 6). These data show that regardless of the presence or absence of comorbid asthma, LABA/ICS is the most widely used of these regimens, followed by tiotropium monotherapy. Interestingly, triple therapy is already a substantially used therapeutic option (usage approximately 60% of that of tiotropium monotherapy). LABA/ICS is more frequently used in patients with comorbid asthma and COPD . While this practice is to be expected, it is likely that the perceived overlap between asthma and COPD is exaggerated due to the common misconception that a significant bronchodilator response in patients with COPD implies the coexistence of an asthmatic component.
The very limited clinical use of LAMA/LABA combination therapy indicated by these data is perhaps surprising, given the current evidence base and GOLD guidance. However, the evidence from ongoing programs will be much more substantial and the future availability of LAMA/LABA FDCs should make this therapeutic option more convenient than separate administration by two inhalers (typically with different dosing schedules), currently the only option.
The rising number of both single-agent and combination therapies for COPD increases the number of treatment options, and, hence, makes treatment choice more complex. Further studies should be designed to provide substantial evidence for future guideline recommendations. In particular, investigation into the optimal sequencing of monotherapies and combination bronchodilators would be of use to determine where LAMA/LABA FDC therapy may be positioned in the treatment algorithm for COPD. Furthermore, examination of the benefits of using dual bronchodilation as initial maintenance therapy would be of interest, along with which groups of patients may benefit from this approach.
There is a growing appreciation of the benefits of bronchodilation beyond lung function, such as exacerbations , patient-reported outcomes, exercise tolerance  and exercise capacity, and daily activities [16, 112]. Trials of LABA/LAMA FDCs should assess this wider range of outcomes in order to more fully understand the broader benefits of increased bronchodilation on a patient’s life as a whole.
Area under the curve from 0–12 hours
Chronic obstructive pulmonary disease
Dry powder inhaler
Forced expiratory volume in 1 second
Global initiative for chronic Obstructive Lung Disease
Long-acting muscarinic antagonist
Pressurized metered dose inhaler
Soft Mist™ Inhaler
Transition Dyspnea Index.
World Health Organization: World health statistics 2008. http://www.who.int/whosis/whostat/2008/en/index.html,
Chapman KR, Mannino DM, Soriano JB, Vermeire PA, Buist AS, Thun MJ, Connell C, Jemal A, Lee TA, Miravitlles M, Aldington S, Beasley R: Epidemiology and costs of chronic obstructive pulmonary disease. Eur Respir J. 2006, 27: 188-207. 10.1183/09031936.06.00024505.
National Institutes of Health, National Heart, Lung, and Blood Institute: Morbidity & Mortality: 2012 Chart Book on Cardiovascular, Lung, and Blood Diseases. http://www.nhlbi.nih.gov/resources/docs/2012_ChartBook.pdf,
Cazzola M, Matera MG: Emerging inhaled bronchodilators: an update. Eur Respir J. 2009, 34: 757-769. 10.1183/09031936.00013109.
Cazzola M, Calzetta L, Matera MG: β2-adrenoceptor agonists: current and future direction. Br J Pharmacol. 2011, 163: 4-17. 10.1111/j.1476-5381.2011.01216.x.
Matera MG, Page CP, Cazzola M: Novel bronchodilators for the treatment of chronic obstructive pulmonary disease. Trends Pharmacol Sci. 2011, 32: 495-506. 10.1016/j.tips.2011.04.003.
Cazzola M, Page CP, Calzetta L, Matera MG: Pharmacology and therapeutics of bronchodilators. Pharmacol Rev. 2012, 64: 450-504. 10.1124/pr.111.004580.
Cazzola M, Rogliani P, Segreti A, Matera MG: An update on bronchodilators in Phase I and II clinical trials. Expert Opin Investig Drugs. 2012, 21: 1489-1501. 10.1517/13543784.2012.710602.
Global initiative for chronic Obstructive Lung Disease: Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease. Revised 2013. http://www.goldcopd.org/guidelines-global-strategy-for-diagnisis-management.pdf,
US Food and Drug Administration: FDA approved drug products. Ipratropium. http://www.accessdata.fda.gov/scripts/cder/drugsatfda/index.cfm]
Yohannes AM, Willgoss TG, Vestbo J: Tiotropium for treatment of stable COPD: a meta-analysis of clinically relevant outcomes. Respir Care. 2011, 56: 477-487. 10.4187/respcare.00852.
Tashkin DP, Celli B, Senn S, Burkhart D, Kesten S, Menjoge S, Decramer M, for the UPLIFT Study Investigators: A 4-year trial of tiotropium in chronic obstructive pulmonary disease. N Engl J Med. 2008, 359: 1543-1554. 10.1056/NEJMoa0805800.
Dahl R, Greefhorst LAPM, Nowak D, Nonikov V, Byrne AM, Thomson MH, Till D, Della Cioppa G, on behalf of the Formoterol in Chronic Obstructive Pulmonary Disease I (FICOPD I) Study Group: Inhaled formoterol dry powder versus ipratropium bromide in chronic obstructive pulmonary disease. Am J Respir Crit Care Med. 2001, 164: 778-784. 10.1164/ajrccm.164.5.2007006.
Cazzola M, Santangelo G, Piccolo A, Salzillo A, Matera MG, D'Amato G, Rossi F: Effect of salmeterol and formoterol in patients with chronic obstructive pulmonary disease. Pulm Pharmacol. 1994, 7: 103-107. 10.1006/pulp.1994.1012.
O'Donnell DE, Sciurba F, Celli B, Mahler DA, Webb KA, Kalberg CJ, Knobil K: Effect of fluticasone propionate/salmeterol on lung hyperinflation and exercise endurance in COPD. Chest. 2006, 130: 647-656. 10.1378/chest.130.3.647.
O'Donnell DE, Flüge T, Gerken F, Hamilton A, Webb K, Aguilaniu B, Make B, Magnussen H: Effects of tiotropium on lung hyperinflation, dyspnoea and exercise tolerance in COPD. Eur Respir J. 2004, 23: 832-840. 10.1183/09031936.04.00116004.
Aguilaniu B: Impact of bronchodilator therapy on exercise tolerance in COPD. Int J Chron Obstruct Pulmon Dis. 2010, 5: 57-71.
Casaburi R, Briggs DD, Donohue JF, Serby CW, Menjoge SS, Witek TJ, for the US Tiotropium Study Group: The spirometric efficacy of once-daily dosing with tiotropium in stable COPD. A 13-week multicenter trial. Chest. 2000, 118: 1294-1302. 10.1378/chest.118.5.1294.
Verkindre C, Fukuchi Y, Flémale A, Takeda A, Overend T, Prasad N, Dolker M: Sustained 24-h efficacy of NVA237, a once-daily long-acting muscarinic antagonist, in COPD patients. Respir Med. 2010, 104: 1482-1489. 10.1016/j.rmed.2010.04.006.
Novartis Europharm Limited: SPC. Onbrez Breezhaler 150 and 300 microgram inhalation powder, hard capsules. http://www.medicines.org.uk/EMC/medicine/23260/SPC/Onbrez+Breezhaler+150+and+300+microgram+inhalation+powder%2c+hard+capsules/,
Novartis Pharmaceutical Corporation: ARCAPTA NEOHALER. Full prescribing information. http://www.accessdata.fda.gov/drugsatfda_docs/label/2012/022383s0002mg.pdf,
Moen MD: Indacaterol. In chronic obstructive pulmonary disease. Drugs. 2010, 70: 2269-2280. 10.2165/11203960-000000000-00000.
Kerwin EM, Meli J, Peckitt C, Lassen C, Kramer B, Filcek S: Efficacy and safety of indacaterol 75 g [sic] once daily in patients with moderate-to-severe COPD [abstract]. Am J Respir Crit Care Med. 2011, 183: A1595-10.1164/rccm.201011-1783OC.
van Noord JA, Korducki L, Hamilton A, Koker P: Four weeks once daily treatment with BI 1744 CL, a novel long-acting β2-agonist, is effective in COPD patients [abstract A6183]. Am J Respir Crit Care Med. 2009, 179: A6183-
Hanania NA, Feldman G, Zachgo W, Shim JJ, Crim C, Sanford L, Lettis S, Barnhart F, Haumann B: Dose-related efficacy of vilanterol trifenatate (VI) in COPD [abstract P1227]. Eur Respir J. 2010, 36 (Suppl 54): 217s-
Tashkin DP, Fabbri LM: Long-acting beta-agonists in the management of chronic obstructive pulmonary disease: current and future agents. Respir Res. 2010, 11: 149-10.1186/1465-9921-11-149.
Vestbo J, Vogelmeier C, Creemers J, Falques M, Ribera A, Garcia Gil E: Onset of effect of aclidinium, a novel, long-acting muscarinic antagonist, in patients with COPD. COPD. 2010, 7: 331-336. 10.3109/15412555.2010.510158.
Gavaldà A, Miralpeix M, Ramos I, Otal R, Carreño C, Viñals M, Doménech T, Carcasona C, Reyes B, Vilella D, Gras J, Cortijo J, Morcillo E, Llenas J, Ryder H, Beleta J: Characterization of aclidinium bromide, a novel inhaled muscarinic antagonist, with long duration of action and a favorable pharmacological profile. J Pharmacol Exp Ther. 2009, 331: 740-751. 10.1124/jpet.109.151639.
Kerwin E, D'Urzo A, Gelb A, Lakkis H, Garcia Gil E, Caracta C: Twice-daily aclidinium bromide in COPD patients: efficacy and safety results from ACCORD COPD I [abstract P1235]. Eur Respir J. 2010, 36 (Suppl 54): 219s-
D'Urzo A, Ferguson GT, van Noord JA, Hirata K, Martin C, Horton R, Lu Y, Banerji D, Overend T: Efficacy and safety of once-daily NVA237 in patients with moderate-to-severe COPD: the GLOW1 trial. Respir Res. 2011, 12: 156-10.1186/1465-9921-12-156.
Orevillo C, St Rose E, Strom S, Fischer T, Golden M, Thomas M, Reisner C: Glycopyrrolate MDI demonstrates comparable efficacy and safety to tiotropium DPI in a randomized, double-blind, placebo-controlled phase 2b study in patients with COPD [abstract P3975]. Eur Respir J. 2011, 38 (Suppl 55): 724s-
Bateman E, Feldman G, Kilbride S, Brooks J, Mehta R, Harris S, Maden C, Crater G: Efficacy and safety of the long-acting muscarinic antagonist GSK233705 delivered once daily in patients with COPD. Clin Respir J. 2012, 6: 248-257. 10.1111/j.1752-699X.2011.00278.x.
Donohue JF, Siler T, Kerwin EM, Williams J, Kianifard F, McBryan D: Efficacy and safety of indacaterol 75 μg once daily in patients with moderate-to-severe COPD: pooled analysis of two phase III trials [abstract A2258]. Am J Respir Crit Care Med. 2012, 185: A2258-
Kerwin EM, Hebert J, Pedinoff A, Gallagher N, Martin C, Banerji D, Lu Y, Overend T: NVA237 once daily provides rapid and sustained bronchodilation in COPD patients, with efficacy similar to tiotropium: the GLOW2 trial [abstract]. Am J Respir Crit Care Med. 2012, 185: A2920-
Cazzola M, Tashkin DP: Combination of formoterol and tiotropium in the treatment of COPD: effects on lung function. COPD. 2009, 6: 404-415. 10.1080/15412550903156333.
Cazzola M, Molimard M: The scientific rationale for combining long-acting β2-agonists and muscarinic antagonists in COPD. Pulm Pharmacol Ther. 2010, 23: 257-267. 10.1016/j.pupt.2010.03.003.
Bouyssou T, Schnapp A, Casarosa P, Pieper MP: Addition of the new once-daily LABA BI 1744 to tiotropium results in superior bronchoprotection in pre-clinical models [abstract A4445]. Am J Respir Crit Care Med. 2010, 181: A4445-
Bouyssou T, Casarosa P, Pieper M, Schnapp A, Gantner F: Synergistic bronchoprotective activity of the long-acting beta 2-agonist olodaterol with tiotropium (long-acting M3 antagonist) and ciclesonide (inhaled steroid) on the ovalbumin-induced bronchoconstriction in anaesthetized guinea pigs [abstract 3451]. Eur Respir J. 2011, 38 (Suppl 55): 613s-
Kume H, Imbe S, Iwanaga T, Tohda Y: Presented at the European Respiratory Society Annual Congress, Vienna, Austria, September 1–5. Synergistic effects between glycopyrronium bromide and indacaterol on a muscarinic agonist-induced contraction in airway smooth muscle [abstract 4835]. 2012
COMBIVENT Inhalation Solution Study Group: Routine nebulized ipratropium and albuterol together are better than either alone in COPD. Chest. 1997, 112: 1514-1521.
COMBIVENT Inhalation Aerosol Study Group: In chronic obstructive pulmonary disease, a combination of ipratropium and albuterol is more effective than either agent alone. An 85-day multicenter trial. Chest. 1994, 105: 1411-1419.
Guleria R, Behera D, Jindal SK: Comparison of bronchodilatation produced by an anticholinergic (ipratropium bromide), a beta-2 adrenergic (fenoterol) and their combination in patients with chronic obstructive airway disease. An open trial. J Assoc Physicians India. 1991, 39: 680-682.
ZuWallack R, De Salvo MC, Kaelin T, Bateman ED, Park CS, Abrahams R, Fakih F, Sachs P, Pudi K, Zhao Y, Wood CC, on behalf of the Combivent Respimat® inhaler Study Group: Efficacy and safety of ipratropium bromide/albuterol delivered via Respimat® inhaler versus MDI. Respir Med. 2010, 104: 1179-1188. 10.1016/j.rmed.2010.01.017.
Dorinsky PM, Reisner C, Ferguson GT, Menjoge SS, Serby CW, Witek TJ: The combination of ipratropium and albuterol optimizes pulmonary function reversibility testing in patients with COPD. Chest. 1999, 115: 966-971. 10.1378/chest.115.4.966.
Campbell S: For COPD a combination of ipratropium bromide and albuterol sulfate is more effective than albuterol base. Arch Intern Med. 1999, 159: 156-160. 10.1001/archinte.159.2.156.
van der Molen T, Cazzola M: Beyond lung function in COPD management: effectiveness of LABA/LAMA combination therapy on patient-centred outcomes. Prim Care Respir J. 2012, 21: 101-108. 10.4104/pcrj.2011.00102.
van Noord JA, Aumann JL, Janssens E, Verhaert J, Smeets JJ, Mueller A, Cornelissen PJG: Effects of tiotropium with and without formoterol on airflow obstruction and resting hyperinflation in patients with COPD. Chest. 2006, 129: 509-517. 10.1378/chest.129.3.509.
Aaron SD, Vandemheen KL, Fergusson D, Maltais F, Bourbeau J, Goldstein R, Balter M, O'Donnell D, McIvor A, Sharma S, Bishop G, Anthony J, Cowie R, Field S, Hirsch A, Hernandez P, Rivington R, Road J, Hoffstein V, Hodder R, Marciniuk D, McCormack D, Fox G, Cox G, Prins HB, Ford G, Bleskie D, Doucette S, Mayers I, Chapman K: Tiotropium in combination with placebo, salmeterol, or fluticasone-salmeterol for treatment of chronic obstructive pulmonary disease. A randomized trial. Ann Intern Med. 2007, 146: 545-555. 10.7326/0003-4819-146-8-200704170-00152.
van Noord JA, Aumann J-L, Janssens E, Smeets JJ, Verhaert J, Disse B, Mueller A, Cornelissen PJG: Comparison of tiotropium once daily, formoterol twice daily and both combined once daily in patients with COPD. Eur Respir J. 2005, 26: 214-222. 10.1183/09031936.05.00140404.
Mahler DA, D'Urzo A, Peckitt C, Lassen C, Kramer B, Filcek S: Combining once-daily bronchodilators in COPD: indacaterol plus tiotropium versus tiotropium alone [abstract]. Am J Respir Crit Care Med. 2011, 183: A1591-
Maltais F, Beck E, Webster D, Maleki-Yazdi MR, Seibt J-V, Arnoux A, Hamilton A: Four weeks once daily treatment with tiotropium + olodaterol (BI 1744) fixed dose combination compared with tiotropium in COPD patients [abstract 5557]. Eur Respir J. 2010, 36 (Suppl 54): 1014s-
Reisner C, St Rose E, Strom S, Fischer T, Golden M, Thomas M, Orevillo C: Fixed combination of glycopyrrolate and formoterol MDI (GFF-MDI) demonstrates superior inspiratory capacity (IC) compared to tiotropium DPI (Tio) following 7 days dosing, in a randomized, double-blind, placebo-controlled phase 2b study in patients with COPD [abstract P879]. Eur Respir J. 2011, 38 (Suppl 55): 150s-
Reisner C, Fogarty C, Spangenthal S, Dunn L, Kerwin EM, Quinn D, Seale JP, Thomas M, St Rose E, Orevillo CJ: Novel combination of glycopyrrolate and formoterol MDI (GFF-MDI) provides superior bronchodilation compared to its components administered alone, tiotropium DPI, and formoterol DPI in a randomized, double-blind, placebo-controlled Phase 2b study in patients with COPD [abstract]. Am J Respir Crit Care Med. 2011, 183: A6453-
Vogelmeier C, Kardos P, Harari S, Gans SJM, Stenglein S, Thirlwell J: Formoterol mono- and combination therapy with tiotropium in patients with COPD: a 6-month study. Respir Med. 2008, 102: 1511-1520. 10.1016/j.rmed.2008.07.020.
Tashkin DP, Pearle J, Iezzoni D, Varghese ST: Formoterol and tiotropium compared with tiotropium alone for treatment of COPD. COPD. 2009, 6: 17-25. 10.1080/15412550902724073.
Tashkin DP, Littner M, Andrews CP, Tomlinson L, Rinehart M, Denis-Mize K: Concomitant treatment with nebulized formoterol and tiotropium in subjects with COPD: a placebo-controlled trial. Respir Med. 2008, 102: 479-487. 10.1016/j.rmed.2007.12.019.
Van de Maele B, Fabbri LM, Martin C, Horton R, Dolker M, Overend T: Cardiovascular safety of QVA149, a combination of indacaterol and NVA237, in COPD patients. COPD. 2010, 7: 418-427. 10.3109/15412555.2010.528812.
van Noord JA, Buhl R, LaForce C, Martin C, Jones F, Dolker M, Overend T: QVA149 demonstrates superior bronchodilation compared with indacaterol or placebo in patients with chronic obstructive pulmonary disease. Thorax. 2010, 65: 1086-1091. 10.1136/thx.2010.139113.
van Noord JA, Aumann J-L, Janssens E, Smeets JJ, Zaagsma J, Mueller A, Cornelissen PJG: Combining tiotropium and salmeterol in COPD: effects on airflow obstruction and symptoms. Respir Med. 2010, 104: 995-1004. 10.1016/j.rmed.2010.02.017.
Tashkin DP, Donohue JF, Mahler DA, Huang H, Goodwin E, Schaefer K, Hanrahan JP, Andrews WT: Effects of arformoterol twice daily, tiotropium once daily, and their combination in patients with COPD. Respir Med. 2009, 103: 516-524. 10.1016/j.rmed.2008.12.014.
Beier J, van Noord J, Deans A, Brooks J, Maden C, Baggen S, Mehta R, Cahn A: Safety and efficacy of dual therapy with GSK233705 and salmeterol versus monotherapy with salmeterol, tiotropium, or placebo in a crossover pilot study in partially reversible COPD patients. Int J Chron Obstruct Pulmon Dis. 2012, 7: 153-164.
Reisner C, Fernandez C, Orevillo C, St Rose E, Kollar C: Pearl Therapeutics' combination LAMA/LABA MDI (GFF MDI, PT003) provides comparable metabolic and ECG safety to Spiriva® HandiHaler® and placebo in patients with COPD [abstract]. Am J Respir Crit Care Med. 2012, 185: A2925-
Feldman G, Walker RR, Brooks J, Mehta R, Crater G: Safety and tolerability of the GSK573719/vilanterol combination in patients with COPD [abstract A2938]. Am J Respir Crit Care Med. 2012, 185: A2938-
Aalbers R, Maleki-Yazdi MR, Hamilton A, Waitere-Wijker S, Pivovarova A, Schmidt O, Bjermer L: Presented at the European Respiratory Society Annual Congress, Vienna, Austria, September 1–5. [abstract 2882]. Dose-finding study for tiotropium and olodaterol when administered in combination via the Respimat® inhaler in patients with COPD. 2012
Hanania NA, Boota A, Kerwin E, Tomlinson L, Denis-Mize K: Efficacy and safety of nebulized formoterol as add-on therapy in COPD patients receiving maintenance tiotropium bromide: results from a 6-week, randomized, placebo-controlled, clinical trial. Drugs. 2009, 69: 1205-1216. 10.2165/00003495-200969090-00005.
Terzano C, Petroianni A, Conti V, Ceccarelli D, Graziani E, Sanduzzi A, D'Avelli S: Rational timing of combination therapy with tiotropium and formoterol in moderate and severe COPD. Respir Med. 2008, 102: 1701-1707. 10.1016/j.rmed.2008.07.012.
Dahl R, Chapman K, Rudolf M, Mehta R, Kho P, Alagappan V, Berhane I, Chen H, Banerji D: Presented at the European Respiratory Society Annual Congress, Vienna, Austria, September 1–5. QVA149 administered once daily provides significant improvements in lung function over 1 year in patients with COPD: the ENLIGHTEN study [abstract 2896]. 2012
Bateman E, Ferguson GT, Barnes N, Gallagher N, Green Y, Horton R, Henley M, Banerji D: Presented at the European Respiratory Society Annual Congress, Vienna, Austria, September 1–5. Benefits of dual bronchodilation with QVA149 once daily versus placebo, indacaterol, NVA237 and tiotropium in patients with COPD: the SHINE study [abstract 2810]. 2012
Vogelmeier CF, Bateman ED, Pallante J, Alagappan VKT, D'Andrea P, Chen H, Banerji D: Efficacy and safety of once-daily QVA149 compared with twice-daily salmeterol-fluticasone in patients with chronic obstructive pulmonary disease (ILLUMINATE): a randomised, double-blind, parallel group study. Lancet Resp Med. 2013, 1: 51-60.
Cazzola M, Di Marco F, Santus P, Boveri B, Verga M, Matera MG, Centanni S: The pharmacodynamic effects of single inhaled doses of formoterol, tiotropium and their combination in patients with COPD. Pulm Pharmacol Ther. 2004, 17: 35-39. 10.1016/j.pupt.2003.09.001.
Cazzola M, Noschese P, Salzillo A, De Giglio C, D'Amato G, Matera MG: Bronchodilator response to formoterol after regular tiotropium or to tiotropium after regular formoterol in COPD patients. Respir Med. 2005, 99: 524-528. 10.1016/j.rmed.2004.10.004.
Di Marco F, Verga M, Santus P, Morelli N, Cazzola M, Centanni S: Effect of formoterol, tiotropium, and their combination in patients with acute exacerbation of chronic obstructive pulmonary disease: a pilot study. Respir Med. 2006, 100: 1925-1932. 10.1016/j.rmed.2006.03.007.
Rabe KF, Timmer W, Sagkriotis A, Viel K: Comparison of a combination of tiotropium plus formoterol to salmeterol plus fluticasone in moderate COPD. Chest. 2008, 134: 255-262. 10.1378/chest.07-2138.
Wang J, Jin D, Zuo P, Wang T, Xu Y, Xiong W: Comparison of tiotropium plus formoterol to tiotropium alone in stable chronic obstructive pulmonary disease: a meta-analysis. Respirology. 2011, 16: 350-358. 10.1111/j.1440-1843.2010.01912.x.
Berton DC, Reis M, Siqueira AC, Barroco AC, Takara LS, Bravo DM, Andreoni S, Neder JA: Effects of tiotropium and formoterol on dynamic hyperinflation and exercise endurance in COPD. Respir Med. 2010, 104: 1288-1296. 10.1016/j.rmed.2010.05.017.
Cazzola M, Centanni S, Santus P, Verga M, Mondoni M, Di Marco F, Matera MG: The functional impact of adding salmeterol and tiotropium in patients with stable COPD. Respir Med. 2004, 98: 1214-1221. 10.1016/j.rmed.2004.05.003.
European Medicines Agency: Guideline on the non-clinical development of fixed combinations of medicinal products. http://www.ema.europa.eu/docs/en_GB/document_library/Scientific_guideline/2009/10/WC500003976.pdf,
US Department of Health and Human Services, US Food and Drug Administration, Center for Drug Evaluation and Research (CDER): Guidance for industry. Chronic obstructive pulmonary disease: developing drugs for treatment. Draft guidance. http://www.fda.gov/downloads/Drugs/GuidanceComplianceRegulatoryInformation/Guidances/ucm071575.pdf,
Chowdhury BA, Seymour SM, Michele TM, Durmowicz AG, Liu D, Rosebraugh CJ: The risks and benefits of indacaterol — the FDA's review. N Engl J Med. 2011, 365: 2247-2249. 10.1056/NEJMp1109621.
Gavalda A, Vinyals M, Aubets J, Gras J: Presented at the European Respiratory Society Annual Congress, Vienna, Austria, September 1–5. Effect of formoterol alone and in combination with aclidinium on electrocardiograms in dogs [abstract 2116]. 2012
Agusti A, Hedner J, Marin JM, Barbé F, Cazzola M, Rennard S: Night-time symptoms: a forgotten dimension of COPD. Eur Respir Rev. 2011, 20: 183-194. 10.1183/09059180.00004311.
Toy EL, Beaulieu NU, McHale JM, Welland TR, Plauschinat CA, Swensen A, Duh MS: Treatment of COPD: relationships between daily dosing frequency, adherence, resource use, and costs. Respir Med. 2011, 105: 435-441. 10.1016/j.rmed.2010.09.006.
Yawn BP, Colice GL, Hodder R: Practical aspects of inhaler use in the management of chronic obstructive pulmonary disease in the primary care setting. Int J Chron Obstruct Pulmon Dis. 2012, 7: 495-502.
Brocklebank D, Ram F, Wright J, Barry P, Cates C, Davies L, Douglas G, Muers M, Smith D, White J: Comparison of the effectiveness of inhaler devices in asthma and chronic obstructive airways disease: a systematic review of the literature. Health Technol Assess. 2001, 5: 1-149.
Dalby R, Spallek M, Voshaar T: A review of the development of Respimat® Soft Mist™ Inhaler. Int J Pharm. 2004, 283: 1-9. 10.1016/j.ijpharm.2004.06.018.
Lechuga-Ballesteros D, Noga B, Vehring R, Cummings RH, Dwivedi SK: Novel cosuspension metered-dose inhalers for the combination therapy of chronic obstructive pulmonary disease and asthma. Future Med Chem. 2011, 3: 1703-1718. 10.4155/fmc.11.133.
Pavkov R, Mueller S, Fiebich K, Singh D, Stowasser F, Pignatelli G, Walter B, Ziegler D, Dalvi M, Dederichs J, Rietveld I: Characteristics of a capsule based dry powder inhaler for the delivery of indacaterol. Curr Med Res Opin. 2010, 26: 2527-2533. 10.1185/03007995.2010.518916.
Chrystyn H, Niederlaender C: The Genuair® inhaler: a novel, multidose dry powder inhaler. Int J Clin Pract. 2012, 66: 309-317. 10.1111/j.1742-1241.2011.02832.x.
Larsen JS, Hahn M, Ekholm B, Wick KA: Evaluation of conventional press-and-breathe metered-dose inhaler technique in 501 patients. J Asthma. 1994, 31: 193-199. 10.3109/02770909409044826.
Goodman DE, Israel E, Rosenberg M, Johnston R, Weiss ST, Drazen JM: The influence of age, diagnosis, and gender on proper use of metered-dose inhalers. Am J Respir Crit Care Med. 1994, 150: 1256-1261. 10.1164/ajrccm.150.5.7952549.
Brand P, Hederer B, Austen G, Dewberry H, Meyer T: Higher lung deposition with Respimat® Soft Mist™ Inhaler than HFA-MDI in COPD patients with poor technique. Int J Chron Obstruct Pulmon Dis. 2008, 3: 763-770.
Lavorini F, Magnan A, Dubus JC, Voshaar T, Corbetta L, Broeders M, Dekhuijzen R, Sanchis J, Viejo JL, Barnes P, Corrigan C, Levy M, Crompton GK: Effect of incorrect use of dry powder inhalers on management of patients with asthma and COPD. Respir Med. 2008, 102: 593-604. 10.1016/j.rmed.2007.11.003.
Hochrainer D, Hölz H, Kreher C, Scaffidi L, Spallek M, Wachtel H: Comparison of the aerosol velocity and spray duration of Respimat® Soft Mist™ Inhaler and pressurized metered dose inhalers. J Aerosol Med. 2005, 18: 273-282. 10.1089/jam.2005.18.273.
Geller DE: Comparing clinical features of the nebulizer, metered-dose inhaler, and dry powder inhaler. Respir Care. 2005, 50: 1313-1321.
Wieshammer S, Dreyhaupt J: Dry powder inhalers: which factors determine the frequency of handling errors?. Respiration. 2008, 75: 18-25. 10.1159/000109374.
Lareau SC, Yawn BP: Improving adherence with inhaler therapy in COPD. Int J Chron Obstruct Pulmon Dis. 2010, 5: 401-406.
Melani AS, Bonavia M, Cilenti V, Cinti C, Lodi M, Martucci P, Serra M, Scichilone N, Sestini P, Aliani M, Neri M, on behalf of the Gruppo Educazionale Associazione Italiana Pnemologi Ospedalieri (AIPO): Inhaler mishandling remains common in real life and is associated with reduced disease control. Respir Med. 2011, 105: 930-938. 10.1016/j.rmed.2011.01.005.
Yu AP, Guérin A, Ponce de Leon D, Ramakrishnan K, Wu EQ, Mocarski M, Blum S, Setyawan J: Therapy persistence and adherence in patients with chronic obstructive pulmonary disease: multiple versus single long-acting maintenance inhalers. J Med Econ. 2011, 14: 486-496.
Kesten S, Jara M, Wentworth C, Lanes S: Pooled clinical trial analysis of tiotropium safety. Chest. 2006, 130: 1695-1703. 10.1378/chest.130.6.1695.
Jung KS, Park HY, Park SY, Kim SK, Kim Y-K, Shim J-J, Moon HS, Lee KH, Yoo J-H, Lee SD: Comparison of tiotropium plus fluticasone propionate/salmeterol with tiotropium in COPD: a randomized controlled study. Respir Med. 2012, 106: 382-389. 10.1016/j.rmed.2011.09.004.
Chatterjee A, Shah M, D'Souza AO, Bechtel B, Crater G, Dalal AA: Observational study on the impact of initiating tiotropium alone versus tiotropium with fluticasone propionate/salmeterol combination therapy on outcomes and costs in chronic obstructive pulmonary disease. Respir Res. 2012, 13: 15-10.1186/1465-9921-13-15.
Welte T, Miravitlles M, Hernandez P, Eriksson G, Peterson S, Polanowski T, Kessler R: Efficacy and tolerability of budesonide/formoterol added to tiotropium in patients with chronic obstructive pulmonary disease. Am J Respir Crit Care Med. 2009, 180: 741-750. 10.1164/rccm.200904-0492OC.
Pasqua F, Biscione G, Crigna G, Auciello L, Cazzola M: Combining triple therapy and pulmonary rehabilitation in patients with advanced COPD: a pilot study. Respir Med. 2010, 104: 412-417. 10.1016/j.rmed.2009.10.005.
Short PM, Williamson PA, Elder DHJ, Lipworth SIW, Schembri S, Lipworth BJ: The impact of tiotropium on mortality and exacerbations when added to inhaled corticosteroids and long-acting β-agonist therapy in COPD. Chest. 2012, 141: 81-86. 10.1378/chest.11-0038.
Karner C, Cates CJ: The effect of adding inhaled corticosteroids to tiotropium and long-acting beta2-agonists for chronic obstructive pulmonary disease (Review). Cochrane Database Syst Rev. 2011, 9: CD009039-
Hughes AD, Jones LH: Dual-pharmacology muscarinic antagonist and β2 agonist molecules for the treatment of chronic obstructive pulmonary disease. Future Med Chem. 2011, 3: 1585-1605. 10.4155/fmc.11.106.
Steinfeld T, Hughes AD, Klein U, Smith JAM, Mammen M: THRX-198321 is a bifunctional muscarinic receptor antagonist and β2-adrenoceptor agonist (MABA) that binds in a bimodal and multivalent manner. Mol Pharmacol. 2011, 79: 389-399. 10.1124/mol.110.069120.
Fernandes LB, Henry PJ, Goldie RG: Rho kinase as a therapeutic target in the treatment of asthma and chronic obstructive pulmonary disease. Ther Adv Respir Dis. 2007, 1: 25-33. 10.1177/1753465807080740.
IMS Health, LifeLink Solutions: IMS data 5/2011-4/2012. 2012
Vogelmeier C, Hederer B, Glaab T, Schmidt H, Rutten-van Mölken MPMH, Beeh KM, Rabe KF, Fabbri LM, for the POET-COPD Investigators: Tiotropium versus salmeterol for the prevention of exacerbations of COPD. N Engl J Med. 2011, 364: 1093-1103. 10.1056/NEJMoa1008378.
Casaburi R, Kukafka D, Cooper CB, Witek TJ, Kesten S: Improvement in exercise tolerance with the combination of tiotropium and pulmonary rehabilitation in patients with COPD. Chest. 2005, 127: 809-817. 10.1378/chest.127.3.809.
Maltais F, Hamilton A, Marciniuk D, Hernandez P, Sciurba FC, Richter K, Kesten S, O'Donnell D: Improvements in symptom-limited exercise performance over 8 h with once-daily tiotropium in patients with COPD. Chest. 2005, 128: 1168-1178. 10.1378/chest.128.3.1168.
The authors take full responsibility for the scope, direction, content of, and editorial decisions relating to, the manuscript, were involved at all stages of development, and have approved the submitted manuscript. Medical writing assistance, supported financially by Boehringer Ingelheim, was provided by Caitlin Watson, PhD, of Complete HealthVizion under the authors’ conceptual direction and based on feedback from both authors. Boehringer Ingelheim was given the opportunity to check the data used in the review for factual accuracy only.
DPT has received grant support from Boehringer Ingelheim, Pearl Therapeutics, Novartis, Forest, and GlaxoSmithKline, speaking fees from Boehringer Ingelheim, Novartis, and Forest, and undertaken consultancy for Pearl Therapeutics, Novartis, and Theravance.
GTF has received grant support from Boehringer Ingelheim, GlaxoSmithKline, Pearl Therapeutics, Novartis, Forest, and Pfizer, speaking fees from Boehringer Ingelheim, GlaxoSmithKline, Astra Zeneca, Novartis, and Forest, and has acted as an advisor to Boehringer Ingelheim, GlaxoSmithKline, Astra Zeneca, Pearl Therapeutics, Forest, and Novartis.
DPT and GTF were responsible for the concept and design of the paper, preparation and revision of the draft, and take full responsibility for the final version of this manuscript.
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