ACE and hydrops fetalis: According to inclusion criteria all patients had a wide QRS complex (174.8 ± 17.0 ms), sinus rhythm, LBBB configuration and were treated according to HF guidelines [7], including beta-blockers, angiotensin converting enzyme inhibitors (ACE-I) or angiotensin receptor blockers (ARB), mineralocorticoid receptor antagonists (MRA), and diuretics at maximum tolerated doses.