Cardiac-resynch-therapy

Consider if EF ≤35%, LBBB (QRS ≥130 ms) and symptomatic HF

36% ↓ mort. & ↑ EF in NYHA III–IV (CARE-HF, NEJM 2005;352:1539)

41% ↓ mort. if EF ≤30%, LBBB and NYHA I/II (NEJM 2014;370:1694)