Effects of airway obstruction and hyperinflation on electrocardiographic axes in COPD

Respiratory Research

Table 1 Baseline characteristics of the study cohort (n = 1195)

Parameter	Mean values ± SD or numbers
Anthropometry
Age, years	63.9 [±8.4]
Sex, m/f	677/518
BMI, kg/m²	26.7 [±5.0]
Diastolic blood pressure, mmHg	75.0 [±10.4]
Lung function
GOLD 0/1/2/3/4	175/107/468/363/82
FEV₁ % predicted	58.8 [±20.7]
FRC % predicted	145.0 [±34.9]
RV, l	3.77 [±1.15]
TLC, l	7.16 [±1.46]
RV/TLC	0.52 [±0.11]
TLCO % predicted	59.9 [±22.8]
KCO % predicted	67.5 [±22.9]
Echocardiographic measures
LVEDD, mm	47.5 [±6.5]
LVESD, mm	31.2 [±6.6]
LV mass, g/m²	106.6 [±34.5]
RV wall thickness, mm	5.9 [±3.5]
Electrocardiogram
RR interval, ms	847.8 [±137.2]
QT duration, ms	386.3 [±29.5]
P wave axis, degree	60.5 [±25.0]
QRS axis, degree	36.1 [±42.6]
T wave axis, degree	53.3 [±23.1]

The table shows mean values [± standard deviations], except for gender and GOLD grade. BMI = body-mass index. Lung function: FEV₁ = forced expiratory volume in 1 s, FRC = functional residual capacity, RV = residual volume; TLC = total lung capacity; TLCO = transfer factor of carbon monoxide (CO); KCO = CO transfer coefficient (ratio of TLCO and alveolar volume). Echocardiographic measures: LV = left ventricular; LVEDD = left ventricular end-diastolic diameter; LVESD = left ventricular end-systolic diameter; RV = right ventricular

ISSN: 1465-993X