- Open Access
Does the presence of systemic artery–pulmonary circulation shunt during bronchial arterial embolization increase the recurrence of noncancer-related hemoptysis? A retrospective cohort study
Respiratory Research volume 24, Article number: 119 (2023)
The presence of systemic artery–pulmonary circulation shunt (SPS) during the bronchial arterial embolization (BAE) procedure, has been inferred to be a potential risk factor for recurrence. The aim of this study is to reveal the impact of SPS on the recurrence of noncancer-related hemoptysis after BAE.
In this study, 134 patients with SPS (SPS-present group) and 192 patients without SPS (SPS-absent group) who underwent BAE for noncancer-related hemoptysis from January 2015 to December 2020 were compared. Four different Cox proportional hazards regression models were used to clarify the impact of SPSs on hemoptysis recurrence after BAE.
During the median follow-up time of 39.8 months, recurrence occurred in 75 (23.0%) patients, including 51 (38.1%) in the SPS-present group and 24 (12.5%) in the SPS-absent group. The 1-month, 1-year, 2-year, 3-year and 5-year hemoptysis-free survival rates in the SPS-present and SPS-absent groups were 91.8%, 79.7%, 70.6%, 62.3%, and 52.6% and 97.9%, 94.7%, 89.0%, 87.1%, and 82.3%, respectively (P < 0.001). The adjusted hazard ratios of SPSs in the four models were 3.37 [95% confidence intervals (CI), 2.07–5.47, P < 0.001 in model 1], 1.96 (95% CI, 1.11–3.49, P = 0.021 in model 2), 2.29 (95% CI, 1.34–3.92, P = 0.002 in model 3), and 2.39 (95% CI, 1.44–3.97, P = 0.001 in model 4).
The presence of SPS during BAE increases the recurrence probability of noncancer-related hemoptysis after BAE.
Hemoptysis is a common symptom of respiratory diseases and can be life-threatening due to the risk of asphyxia and acute blood loss. In recent decades, bronchial arterial embolization (BAE) has been recognized as a minimally invasive and effective method for controlling hemoptysis . However, recurrence of noncancer-related hemoptysis after BAE is still common. The early (≤ 1 month) recurrence rate has remained below 10%, while the long-term cumulative recurrence rate is as high as 30% [2,3,4,5]. Among patients with relapse, 40–60% require repeat embolization or lobectomy or experience death [3, 6, 7].
The definitive risk factors for recurrence after BAE include heavy smoking, lung destruction, aspergillomas, and culprit vessels from nonbronchial systemic arteries (NBSAs) [3, 6,7,8]. In addition, another arteriography-specific parameter during the BAE procedure, the presence of systemic artery–pulmonary circulation shunt (SPS), has been inferred to be a potential risk factor for recurrence, although this has remained controversial [2, 3, 6, 8,9,10,11]. There is a vascular network between the systemic and pulmonary circulatory circuits at both the capillary and precapillary levels under natural physiologic and anatomic conditions . Long-course pulmonary inflammation induces hypertrophy of the systemic vessels and then amplifies these communicating vessels as substitute shunts.
These shunts open pathologically and are prone to rupture under chronic inflammation and systemic arterial pressure . In this context, an SPS for hemodynamic regulation is applied as a compensatory alteration in ~ 30% of hemoptysis patients [14, 15]. However, the effect of SPSs has received relatively little attention in previous studies, and some results have shown the negative predictive value of SPSs for recurrence [6, 11, 16]. A previous study revealed that the incidence of same-vessel recanalization in patients with SPSs (80.0%) seemed to be higher than that in patients without SPSs (30.8%) , which may also provide clues regarding the mechanism of recurrence. Given these findings, clarification of whether the presence of SPS during BAE is an independent risk factor for recurrence after embolization is necessary and may initiate the exploration of further treatment strategies. We hypothesized that the presence of shunt would increase recurrence of noncancer-related hemoptysis after BAE.
Thus, we conducted a retrospective cohort study to investigate the association between the presence of SPS and recurrence of noncancer-related hemoptysis after endovascular treatment.
Materials and methods
The research protocol of this retrospective study was discussed and approved by the local institutional ethics review board, and the requirement for informed consent was waived due to its retrospective nature. All procedures performed in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The data analyzed in this study is available upon reasonable request from the corresponding author.
We queried the baseline information, preoperative computed tomography (CT) and angiographic data of 436 consecutive adult patients who underwent arterial embolization for hemoptysis at our institution between January 2015 and December 2020. The exclusion criteria were as follows: (1) cancer-related hemoptysis (n = 59); (2) technical failure (n = 3); (3) clinical failure (n = 8); (4) history of BAE or lobectomy (n = 12); (5) incomplete clinical information (n = 3); and (6) unavailable follow-up date (n = 25). Ultimately, 134 patients were enrolled in the SPS-present group, while 192 patients were enrolled in the SPS-absent group. Figure 1 shows the patient enrollment flowchart. The presence of SPS was identified by the presence of feeding arteries (bronchial arteries and NBSAs) and pathological communicating and drainage vessels (Fig. 2) on dynamic angiography by two doctors independently; the decision was discussed with a senior doctor, and an agreement was reached, ensuring the reliability of the assessment.
The covariates in the present study included baseline information (age, sex, underlying lung disease, smoking, hypertension, duration and volume of hemoptysis), preoperative CT findings (number of affected lobes, presence of pleural thickening, and lung destruction), and angiographic data (number and diameter of culprit bronchial arteries, presence of NBSAs, and embolization materials). Hemoptysis severity was graded and classified into three levels according to the volume of hemoptysis: mild (< 100 ml/d), moderate (100–300 ml/d), and massive (≥ 300 ml/d) . Eight patients underwent bronchoscopy, CT and CT angiography (CTA) were performed for every patient during hospitalization. They could show underlying lung disease, locate the bleeding source, identify origins and courses of bronchial arteries and NBSAs, which provide high possibility for clinical success after BAE. The underlying lung disease included bronchiectasis, tuberculosis sequelae, chronic pneumonia, and cryptogenic hemoptysis. Cryptogenic hemoptysis indicated a lack of specific parenchymal or vascular abnormalities in the lung, as noted on preoperative CTA . Pleural thickening > 3 mm was diagnosed as pathological . Irreversible parenchymal destruction characterized by diffuse adhesions and large cavities was defined as lung destruction .
Arterial embolization procedures
All patients received standard medical care, including vital sign monitoring, hypoxemia correction, and hemostasis. The angiographic machines used included the Artis Zeego Digital Subtraction Angiography (DSA) (Siemens, Germany) and UNIQ FD20 DSA (PHILIPS, Netherlands) devices. The BAE procedure was performed by two interventional physicians with 8 and 10 years of experience. Before the procedure, they reviewed CT and CTA images to observe anatomy of the culprit artery and searched suspicious NBSAs according to the location of lung lesion, in particular, inferior phrenic arteries for inferior lobe lesion, internal mammary or esophageal arteries for medial lung lesion and superior thoracic arteries for superior lobe lesion, lateral thoracic arteries for lateral lung lesion, etc.. All procedures were performed via the femoral artery approach. A 5-F angiographic catheter (Cobra, RLG, MIK; Cook, USA) was inserted into suspicious culprit vessels (bronchial and nonbronchial arteries) to perform angiography with a total volume of 6–10 ml contrast agent (iodixanol 320 mgI/ml, GE Healthcare, United States or iopromide 370 mgI/ml, BAYER, Germany) injected at a speed of 1.5–2.0 ml/s. The abnormal angiographic findings included contrast agent extravasation, hypertrophic and tortuous vessels, hypervascularity, and presence of an SPS . Then, a microcatheter (2.7F; Terumo, Tokyo, Japan; or 2.4F; Merit Maestro, Utah, USA) was advanced as distally as possible to avoid ectopic embolization. The embolic materials were polyvinyl alcohol (PVA) particles (300–500 μm; Cook, USA), microspheres (500–700 μm; Merit Maestro, Utah, USA), and gelatin sponge particles (350–560 μm; Hangzhou Alicon Pharmaceutical Co., Ltd., Zhejiang, China). Microcoils (Cook, USA) were used for large vessel diameters or aneurysmal dilatation of culprit vessels after initial embolization with particles. The endpoint of embolization was complete occlusion of all the culprit arteries.
Follow-up and recurrence
Technical success was reflected by immediately successful embolization of all culprit vessels; otherwise, the procedure was considered a technical failure . Clinical success was defined as the resolution of hemoptysis within 24 h after the procedure; otherwise, the procedure was defined as a clinical failure . Severe procedure-related complications resulted in prolonged hospitalization, advanced care, unscheduled admission for therapy after discharge, permanent sequelae or death; all other complications were considered minor complications .
After discharge, follow-up evaluations in an outpatient clinic were scheduled at approximately 1–3 months. Subsequently, the patient was followed up by telephone interview approximately every six months for the first two years. If there was no recurrence, the follow-up calls were reduced to once a year. The follow-up assessed the general condition of the patient, queried details of hemoptysis recurrence (date of relapse, volume of hemoptysis, and management details) and provided healthy lifestyle education, including on smoking cessation, precautions according to the season of the year, abdominal respiration, and controlling pulmonary infections with low-dose macrolide therapy. Recurrence was defined as relapse with a hemoptysis volume ≥ 30 ml per day, the need for repeated BAE or lobectomy, or death due to recurrent hemoptysis after clinical success . According to the angiographic findings during repeated BAE, the cause of the recurrence was also documented; these causes included missed culprit arteries, recanalization and new collateral arteries. The end date of follow-up was May 2021 or the date of death.
All data analyses were performed with the Statistical Package for the Social Sciences (SPSS, version 22.0, Armonk, NY, USA). Patients with complete follow-up information were included in the final analysis. Continuous variables are described as the means and standard deviations (SD), and categorical variables are expressed as numbers (%). We compared the baseline characteristics of patients in the SPS-absent and SPS-present groups. Categorical variables were compared with the χ2 test or Fisher’s exact test. Continuous variables were compared with the t test or the Wilcoxon test. Cumulative hemoptysis-free curves were estimated by the Kaplan–Meier method. The impact of SPSs on recurrence was assessed by four different Cox proportional hazards regression models. Model 1 was a univariate Cox proportional hazards regression model. Model 2 was the full model that integrated all potential factors. Then, multivariate Cox analysis was performed to identify the statistically significant variables (P < 0.1) in Model 2, which was described as Model 3. In Model 4, the presence of SPS was the only factor maintained in the model, and the other variables were screened in a forward stepwise manner. A P value < 0.05 was considered to indicate statistical significance. A forest plot was generated with GraphPad Software (Prism 8.0.1, San Diego, California) according to the hazard ratio (HR) and 95% confidence interval (CI) of different models.
Characteristics of the study cohort
The baseline characteristics of the study cohort are provided in Table 1. The SPS-present group had more female patients (P = 0.001), a different composition of underlying lung disease (P < 0.001), a longer duration of hemoptysis (P < 0.001), more affected lobes (P < 0.001), culprit arteries with larger diameters (P < 0.001), and a higher incidence of pleural thickening (P < 0.001), lung destruction (P = 0.001) and culprit NBSAs (P < 0.001) than the SPS-absent group. The other variables did not show significant differences between groups.
Arterial embolization and complications
In total, we embolized 832 culprit arteries, including 733 bronchial arteries (401 in the right lung, 332 in the left lung) and 99 NBSAs, with an average of 2.6 arteries per patient. Culprit NBSAs were identified in 57 (42.5%) patients in the SPS-present group and 25 (13.0%) patients in the SPS-absent group. There were no significant differences in the number of culprit bronchial arteries and embolization materials (P = 0.677 and P = 0.273, respectively). Microcoils were used to treat high-level shunts in 10 patients (bronchial artery: 9 patients; NBSAs: 1 patient) and for aneurysmal dilatation of culprit arteries in 6 patients (bronchial artery: 5 patients; NBSAs: 1 patient).
Minor complications were observed in 60 patients, including chest or shoulder pain (n = 32), fever (n = 20), vomiting (n = 4), abdominal pain (n = 3) and puncture site discomfort (n = 1), all of which were relieved by conservative treatment. One patient in the SPS-present group suffered cerebral infarction after BAE with 300–500 μm PVA. There were no significant differences in either the minor or major complication rates between the two groups: 19.4% (26/134) and 0.7% (1/134) for the SPS-present group and 17.7% (34/192) and 0 for the SPS-absent group (P = 0.698 and P = 0.856, respectively).
Shunt and recurrence
During the median follow-up time of 39.8 months, recurrence was observed in 75 (23.0%) patients, 51 (38.1%) of whom were in the SPS-present group and 24 (12.5%) of whom were in the SPS-absent group. There was no difference in the median follow-up time between the two groups (38.6 vs. 42.6 months, P = 0.271). The number of recurrence events in the SPS-present group, there were 27, 11, 8, 4 and 1 recurrence events in the first, second, third, fourth and fifth years, while the corresponding numbers in the SPS-absent group were 10, 9, 2, 2 and 1. The 1-month, 1-year, 2-year, 3-year and 5-year hemoptysis-free survival rates of 91.8%, 79.7%, 70.6%, 62.3%, and 52.6% in the SPS-present group were significantly lower than the rates of 97.9%, 94.7%, 89.0%, 87.1%, and 82.3% in the SPS-absent group (P < 0.001) (Fig. 3). In the SPS-present group, 24 patients underwent repeated BAE, 2 patients underwent segmentectomy, 19 patients received medical therapy for recurrent hemoptysis, and 6 patients died due to recurrent hemoptysis; in the SPS-absent group, 8 patients underwent repeated BAE, and 16 patients received medical therapy. According to the angiography results from repeated BAE, the causes of relapse included missed culprit arteries (4 in the SPS-present group; 2 in the SPS-absent group, P = 0.601) for early recurrence, new collateral artery formation (7 in the SPS-present group; 5 in the SPS-absent group, P = 0.092) and recanalization (13 in the SPS-present group; 1 in the SPS-absent group, P = 0.040) for later recurrence.
The adjusted HRs of SPSs in the four models were 3.37 (95% CI, 2.07–5.47, P < 0.001 in model 1), 1.96 (95% CI, 1.11–3.49, P = 0.021 in model 2), 2.29 (95% CI, 1.34–3.92, P = 0.002 in model 3), and 2.39 (95% CI, 1.44–3.97, P = 0.001 in model 4) (Table 2). Based on these results, we generated a forest plot (Fig. 4).
The recurrence of noncancer-related hemoptysis after a successful BAE procedure is a troublesome but inevitable issue in clinical practice. In addition to some definite predictors, the presence of SPS has been inferred to be a potential risk factor for recurrence, but this remains controversial and needs to be further studied [2, 3, 6, 8, 9, 11, 14, 16, 24]. In the present study, the hemoptysis-free survival rates were significantly lower in the SPS-present group than in the SPS-absent group. After adjusting for confounding factors in four statistical models, the results demonstrated high consistency and confirmed that the presence of SPS increased the probability of noncancer-related hemoptysis recurrence after BAE.
Under normal conditions, there is communication between the systemic and pulmonary circulation at both the capillary and precapillary levels, but radiological observation of this is exceedingly rare . In a long-term chronic inflammatory environment, impairment of the pulmonary circulation and collateral pulmonary interstitial hypoxia occur. More systemic arteries are recruited and remodeled, exhibiting both enlargement and angiogenesis to compensate for decreased lung perfusion . Under systemic circulation pressure, the vascular network gradually enlarges to form a pathological SPS, which can then be identified on angiograms. This can also explain the higher number of patients with bronchiectasis and tuberculosis sequela, longer duration of hemoptysis, higher number of affected lobes, larger diameter of culprit arteries, and higher incidence of pleural thickening, lung destruction and culprit NBSAs in the SPS-present group.
In this study, different Cox proportional hazards regression models revealed that the impact of SPSs on recurrence was robust (all P values < 0.05 and HRs > 1). The hemoptysis-free survival rates of the SPS-present group were evidently inferior to those of the SPS-absent group. The majority (38/51) of patients in the SPS-present group experienced recurrence in the first 2 years. More patients in the SPS-preset group than in the SPS-absent group who experienced poor outcomes, including the need for segmentectomy and death due to recurrent hemoptysis. Angiograms of repeated BAE revealed that the rate of recanalization in the SPS-present group was higher than that in the SPS-absent group (13/24 vs. 1/8). This result suggested that culprit arteries complicated by SPS might be prone to recanalization, which was in line with a previous study . The cause of this phenomenon could be the escape and dislocation of embolized materials, which can be induced by the enlargement or rupture of SPSs under systemic pressure and aggravation of local inflammation. As another cause of later recurrence in our study, new collateral artery formation was usually induced by the progression of underlying lung disease. Therefore, the choice of embolic materials for SPSs and gaining control of underlying lung diseases warrant further prospective studies. In addition, the presence of an SPS could potentially increase the risk of nontargeted embolization, such as pulmonary infarction or systemic artery embolization . In our study, one patient in the SPS-present group suffered cerebral lacunar infarction after embolization, which also needs to be considered.
Visualizing SPSs and considering possible outcomes before the BAE procedure seem to be key issues. CTA has the potential to show radiographic indications of SPS in the transpleural systemic arterial supply . Clinically, because CT scans are still suboptimal for identifying the existence and dynamics of SPS, these shunts are mainly identified by angiography. Recently, Qu et al. reported that SPS could be evaluated by dual-input computed tomography perfusion (DI-CTP) in tuberculosis-related hemoptysis patients . However, the radiation exposure rate of DI-CTP is higher than that of conventional CTA. The sensitivity and specificity of DI-CTP and angiography of BAE need to be further compared . Therefore, the possible imaging findings associated with the presence of SPSs need to be further investigated.
This study had some limitations. First, due to its retrospective design, this study has inherent limitations. There were differences in some of the baseline characteristics between the two groups. However, four different Cox proportional hazards regression models were applied to confirm the stability of our hypothesis. Second, although we distinguished between the types of shunts, the type and level of SPSs were hard to stratify in subsequent analysis, which may need further exploration. Third, we did not collect and analyze variables about the inflammation index or treatment for underlying lung disease, which may influence the recurrence rate. However, patients in our study underwent programmed treatment for underlying lung disease during hospitalization and follow-up time.
In conclusion, our study confirmed that the presence of SPS increased the recurrence probability of noncancer-related hemoptysis after BAE. Further treatment strategies for SPSs among hemoptysis patients warrant further prospective studies.
Availability of data and materials
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Bronchial arterial embolization
Computed tomography angiography
Digital subtraction angiography
Dual-input computed tomography perfusion
Nonbronchial systemic arteries
Systemic artery–pulmonary circulation shunts
Expert Panel on Thoracic Imaging, Olsen KM, Manouchehr-Pour S, et al. ACR appropriateness criteria(R) hemoptysis. J Am Coll Radiol. 2020;17:S148–59.
Chen J, Chen LA, Liang ZX, et al. Immediate and long-term results of bronchial artery embolization for hemoptysis due to benign versus malignant pulmonary diseases. Am J Med Sci. 2014;348:204–9.
Lu GD, Zu QQ, Zhang JX, et al. Risk factors contributing to early and late recurrence of haemoptysis after bronchial artery embolisation. Int J Tuberc Lung Dis. 2018;22:230–5.
Kato A, Kudo S, Matsumoto K, et al. Bronchial artery embolization for hemoptysis due to benign diseases: immediate and long-term results. Cardiovasc Intervent Radiol. 2000;23:351–7.
Syha R, Benz T, Hetzel J, et al. Bronchial artery embolization in hemoptysis: 10-year survival and recurrence-free survival in benign and malignant etiologies—a retrospective study. Rofo. 2016;188:1061–6.
Chun JY, Belli AM. Immediate and long-term outcomes of bronchial and non-bronchial systemic artery embolisation for the management of haemoptysis. Eur Radiol. 2010;20:558–65.
Choi J, Baik JH, Kim CH, et al. Long-term outcomes and prognostic factors in patients with mild hemoptysis. Am J Emerg Med. 2018;36:1160–5.
Yan HT, Lu GD, Huang XZ, et al. A nomogram to predict recurrence after bronchial artery embolization for hemoptysis due to bronchiectasis. Cardiovasc Intervent Radiol. 2021;44:1609–17.
Xu S, Guan LJ, Shi BQ, Tan YS, Zhang XJ. Recurrent hemoptysis after bronchial artery embolization: prediction using a nomogram and artificial neural network model. AJR Am J Roentgenol. 2020;215:1490–8.
Lu GD, Zhang JX, Zhou CG, et al. Arterial embolization for hemoptysis in patients with chronic pulmonary tuberculosis and in patients with bronchiectasis. Acta Radiol. 2019;60:866–72.
van den Heuvel MM, Els Z, Koegelenberg CF, Naidu KM, Bolliger CT, Diacon AH. Risk factors for recurrence of haemoptysis following bronchial artery embolisation for life-threatening haemoptysis. Int J Tuberc Lung Dis. 2007;11:909–14.
Yon JR, Ravenel JG. Congenital bronchial artery–pulmonary artery fistula in an adult. J Comput Assist Tomogr. 2010;34:418–20.
Yoon W, Kim JK, Kim YH, Chung TW, Kang HK. Bronchial and nonbronchial systemic artery embolization for life-threatening hemoptysis: a comprehensive review. Radiographics. 2002;22:1395–409.
Lu GD, Zu QQ, Liu XL, et al. Embolisation for life-threatening haemoptysis complicated by systemic artery–pulmonary circulation shunts. Int J Tuberc Lung Dis. 2016;20:276–81.
Chan VL, So LK, Lam JY, et al. Major haemoptysis in Hong Kong: aetiologies, angiographic findings and outcomes of bronchial artery embolisation. Int J Tuberc Lung Dis. 2009;13:1167–73.
Peng Y, Zhu Y, Ao G, et al. Effect of bronchial artery embolisation on the management of tuberculosis-related haemoptysis. Int J Tuberc Lung Dis. 2019;23:1269–76.
Panda A, Bhalla AS, Goyal A. Bronchial artery embolization in hemoptysis: a systematic review. Diagn Interv Radiol. 2017;23:307–17.
Lee H, Yoon CJ, Seong NJ, Jeon CH, Yoon HI, Go J. Cryptogenic hemoptysis: effectiveness of bronchial artery embolization using n-butyl cyanoacrylate. J Vasc Interv Radiol. 2017;28:1161–6.
Yoon W, Kim YH, Kim JK, Kim YC, Park JG, Kang HK. Massive hemoptysis: prediction of nonbronchial systemic arterial supply with chest CT. Radiology. 2003;227:232–8.
Sayir F, Ocakcioglu I, Şehitoğulları A, Çobanoğlu U. Clinical analysis of pneumonectomy for destroyed lung: a retrospective study of 32 patients. Gen Thorac Cardiovasc Surg. 2019;67:530–6.
Davidson K, Shojaee S. Managing massive hemoptysis. Chest. 2020;157:77–88.
Swanson KL, Johnson CM, Prakash UB, McKusick MA, Andrews JC, Stanson AW. Bronchial artery embolization: experience with 54 patients. Chest. 2002;121:789–95.
Angle JF, Siddiqi NH, Wallace MJ, et al. Quality improvement guidelines for percutaneous transcatheter embolization: society of interventional radiology standards of practice committee. J Vasc Interv Radiol. 2010;21:1479–86.
Lee JH, Kwon SY, Yoon HI, et al. Haemoptysis due to chronic tuberculosis vs. bronchiectasis: comparison of long-term outcome of arterial embolisation. Int J Tuberc Lung Dis. 2007;11:781–7.
McCullagh A, Rosenthal M, Wanner A, Hurtado A, Padley S, Bush A. The bronchial circulation-worth a closer look: a review of the relationship between the bronchial vasculature and airway inflammation. Pediatr Pulmonol. 2010;45:1–13.
Baltacioğlu F, Cimşit NC, Bostanci K, Yüksel M, Kodalli N. Transarterial microcatheter glue embolization of the bronchial artery for life-threatening hemoptysis: technical and clinical results. Eur J Radiol. 2010;73:380–4.
Zhang YF, Zhao Q, Huang R. Computed tomography angiography for presence of systemic-to-pulmonary artery shunt in transpleural systemic arterial supply. Eur J Radiol. 2020;129: 109060.
Qu H, Wang M, Wang Z, et al. Diagnostic value of dual-input computed tomography perfusion on detecting bronchial-pulmonary artery fistula in tuberculosis patients with massive hemoptysis. Acad Radiol. 2018;25:1018–24.
This study was funded by Jiangsu Province’s Key Talents Program (QNRC2016559 to Qing-Quan Zu) and Construction Program of Jiangsu Province Clinical Research Center Support System (BL2014084 to Qing-Quan Zu).
Ethics approval and consent to participate
Study protocol followed the guidelines of the World Medical Association Declaration of Helsinki and were approved by the Ethics Committee of the First Affiliated Hospital with Nanjing Medical University (Ethical review no. 2018-SR-097). Written informed consent was not required for this retrospective study.
Consent for publication
The authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.
About this article
Cite this article
Yan, HT., Lu, GD., Liu, J. et al. Does the presence of systemic artery–pulmonary circulation shunt during bronchial arterial embolization increase the recurrence of noncancer-related hemoptysis? A retrospective cohort study. Respir Res 24, 119 (2023). https://doi.org/10.1186/s12931-023-02427-0
- Cohort studies
- Pulmonary circulation