Table 1.

LBBB Selvester score criteria.

	Lead	LBBB Selvester score criteria	Points	Maximum points
Anterosuperior wall	I	(i) R/Q ≤ 1.5	1	1
		(ii) R/S ≤ 1.5
	aVL	(i) Q ≥ 50 ms	2	4
		(ii) Q ≥ 40 ms	1
		(iii) R/S ≤ 0.5	2
		(iv) R/Q ≤ 0.5
		(v) R/S ≤ 1.0	1
		(vi) R/Q ≤ 1.0
Inferior wall	II	(i) Q ≥ 40 ms	2	3
		(ii) Q ≥ 30 ms	1
		(iii) R/Q ≤ 0.5	1
		(iv) R/S ≤ 0.5
	aVF	(i) Q ≥ 50 ms	2	3
		(ii) Q ≥ 40 ms	1
		(iii) R/Q ≤ 0.5	1
		(iv) R/S ≤ 0.5
Anteroseptal wall	V 1	(i) Notch first 40 ms	1	3
		(ii) R ≥ 0.3 mV	2
		(iii) R ≥ 30 ms
		(iv) R ≥ 0.2 mV	1
		(v) R ≥ 20 ms
	V 2	(i) Notch first 40 ms	1	3
		(ii) R ≥ 0.4 mV	2
		(iii) R ≥ 30 ms
		(iv) R ≥ 0.3 mV	1
		(v) R ≥ 20 ms
Posterolateral wall	V 1	(i) S/S' ≥ 2.0	3	3
		(ii) S/S' ≥ 1.5	2
		(iii) S/S' ≥ 1.25	1
	V 2	(i) S/S' ≥ 2.5	3	3
		(ii) S/S' ≥ 2.0	2
		(iii) S/S' ≥ 1.5	1
Apical segments	I	(i) Any Q	1	2
		(ii) R ≤ 0.2 mV
		(iii) R/Q ≤ 1.0	1
		(iv) R/S ≤ 1.0
	V 5	(i) Any Q	1	4
		(ii) R/R' ≥ 2.0	2 1
		(iii) R/R' ≥ 1.0
		(iv) R/S ≤ 2.0
		(v) R ≤ 0.5 mV	1
	V 6	(i) Q ≥ 20 ms	1	4
		(ii) R/R' ≥ 2.0	2 1	383
		(iii) R/R' ≥ 1.0
		(iv) R/S ≤ 2.0
		(v) R ≤ 0.6 mV	1	384