Table 4.

Electrocardiographic variables in COPD patients with mean PAP < 40 or ≥ 40 mmHg

	Mean PAP < 40 mmHg Mean (SD) or n (%)	Mean PAP ≥ 40 mmHg Mean (SD) or n (%)	p
n (%)	126 (89)	16 (11)
P wave amplitude in V1	0.73 (0.04)	0.12 (0.08)	0.04
PR interval (ms)	142.2 (23)	178.5 (35)	0.001
QRS complex duration (ms)	88.6 (13)	95.8 (15)	0.048
S wave amplitude in lead I	0.12 (0.12)	0.19 (0.13)	0.03
T wave axis	63.6 (24)	42.8 (46)	0.005
Negative T waves in the inferior leads	7 (5.6)	4 (25)	0.02

Abbreviations: PAP: pulmonary artery pressure.