Table 3.

Predicted Female QRSd Guidelines for CRT Recommendations Calibrated with LV Size

Guidelines	QRSd (ms)	QRS Morphology	EFa	ICMb	NYHAc Class	CORd	Recommendation	Female QRSd (ms)
ESC 2016 (2)	>130	LBBB	<35%			I	Recommend CRT	>118
	>130	non-LBBB	<35%			II a	Consider CRT	>120
	<130		<35%			III	Contraindicated	<120
ACCF/AHA 2013 (1)	>150	LBBB	<35%		II, III, IV	I	Recommend CRT	>137
	>150	non-LBBB	<35%		II	II a	Can be useful	>138
	120–149	LBBB	<35%		II, III, IV	II a	Can be useful	109–136
	120–149	non-LBBB	<35%		III, IV	II b	May be considered	111–137
	>150	non-LBBB	<35%		II	II b	May be considered	>138
	>150	LBBB	<30%	ICM		II b	May be considered	>137
	<150	non-LBBB	<35%		I or II	III	Contraindicated	<138

^aEF, Ejection fraction.

^bICM, Ischemic Cardiomyopathy.

^cNYHA Class, New York Heart Association Functional Classification.

^dCOR, class of recommendation.