TABLE 2.

Definitions of ECG Parameters and Measurements Employed in this Study

VARIABLES	DEFINITIONS
Right precordial T wave inversion through V2	Inverted T wave in Leads V1 and V2
Right precordial T wave inversion through V3 ¹⁰	Inverted T wave in Leads V1,V2 and V3
Right precordial T wave inversion through V4	Inverted T wave in Leads V1, V2, V3 and V4
T wave inversion in Inferior Leads	Inverted T waves in 2 out of 3 inferior leads
Epsilon Wave¹²	Distinct waves of small amplitude that occupy the ST segment in the right precordial leads and are distinct from the QRS complex
QRS prolongation in right precordial leads ¹⁰	QRSd > 110 msec in lead V1,V2, or V3
Parietal Block ¹¹	QRSd in lead V1 to V3 that exceeds the QRSd in Lead V6 by > 25 ms
Prolonged Terminal activation duration ¹⁵	Longest value in V1–V3 from the nadir of the S wave to the end of all depolarization
Localized right precordial QRS prolongation (Increased ratio in the QRSd of the right versus left precordial leads) ¹³,¹⁴	QRS duration:(V1+V2+V3)/(V4+V5+V6)≥ 1.2 with QRSd ≥ 100 msec in 2 of 3 right precordial leads
Complete RBBB ¹⁶	QRSd ≥ 120 ms and :
	A1: R’ or r’ in V1 or V2
	A2: S duration > R duration in I and V6
	A3: S duration > 40 msec in I and V6
	A4: R peak time > 50 msec in V1 or V2
	a: A1+A2
	b: A1+A3
	c: A4+ (A2orA3)
Incomplete RBBB ¹⁶	QRS <120 msec and R peak time in V1 or V2 > 50 msec
R or r prime in V1/V2	A positive deflection in V1/V2 following an S wave
r'/s ratio in V1	Ratio of amplitude of r' and S wave in lead V1