TABLE 4.

Sensitivity and Specificity of ECG Features

VARIABLES	No RBBB		IRBB		CRBBB
	Sensitivity	Specificity	Sensitivity	Specificity	Sensitivity	Specificity
Repolarization Criteria
Right precordial T wave inversion through V2	84 (73–92)	89 (71–98)	80 (52–96)	73 (50–89)	76 (50–93)	62 (24–91)
Right precordial T wave inversion through V3	71 (58–81)	96 (81–100)	73 (45–92)	95 (77–100)	71 (44–90)	62 (24–91)
Right precordial T wave inversion through V4	51 (39–64)	96 (81–100)	60 (32–84)	100 (85–100)	59 (33–82)	88 (47–100)
T wave inversion in Inferior leads (2 out of 3)	41 (29–54)	93 (76–99)	47 (21–73)	100 (85–100)	53 (28–77)	87 (47–100)
Depolarization Criteria
Epsilon Wave	7 (2–16)	100 (87–100)	0 (0–15)	100 (78–100)	0 (0–37)	100 (80–100
QRS prolongation in right precordial leads QRS > 110ms	43 (31–55)	96 (81–100)	80 (52–96)	91 (71–99)	100 (80–100)	0 (0–37)
Parietal Block	13 (6–24)	96 (81–100)	40 (16–68)	91 (70–99)	47 (23–72)	50 (16–84)
Prolonged terminal activation duration	46 (33–58)	89 (71–98)	80 (52–96)	64 (41–83)	100 (80–100)	12 (0.32–53)
Increased ratio in QRSd of the right versus left precordial leads	22 (13–34)	79 (58–91)	40 (16–68)	91 (71–99)	35 (14–62)	37 (9–76)
r'/s ratio < 1	-	-	93 (66–100)	5 (0.12–23)	88 (64–99)	86 (42–100)