eTable 2. Frequency of electrocardiographic signs in pulmonary hypertension.

ECG sign	%	Source
Normal ECG on diagnosis	5–14	(28, e50)
P pulmonale	0–35	(26, e51)
QRS axis > 90°	35–78	(e51, e52)
SI-QIII type	7–65	(e53, e54)
SI-SII-SIII type	7	(e54)
Right ventricular hypertrophy (R V1(,V2) + S V5, V6 > 1.05 mV)	32–74	(e54, e55)
Large R wave in V1 (> 0,6 mV)	15–53	(e54, e56)
Large S wave in n V5 (> 1,0 mV)	9–37	(23, e54)
Large S wave in V6 (> 0,3 mV)	45–75	(23, e54)
Right bundle branch block	5–50	(e51, e57)
qR in V1	6–61	(26, e55)
T wave inversion in II	31	(e54)
T wave inversion in III	49	(e54)
T wave inversion in aVF	41	(e54)
T wave inversion in V1	64–87	(e54, e58)
T wave inversion in V2	51	(e54)
T wave inversion in V3	60	(e54)