Suppression of acute heart failure rehospitalization by biventricular pacing in wide QRS and mid-range ejection fraction.

We present a 66-year-old male patient with heart failure, mid-range ejection fraction and QRS widening suffering from recurrent hospitalization due to acute heart failure. We measured intra-cardiac pressure by cardiac catheterization to clearly demonstrate the augmentation of afterload by a vasoconstricting drug induced increase of left ventricular end-diastolic blood pressure and pulmonary capillary wedge pressure with pulmonary arterial V-wave augmentation (indicator of worsening of mitral regurgitation). Because the patient was considered as refractory to optimal medication, cardiac resynchronization therapy (CRT) was performed. After CRT implantation, these factors were improved, and the patient has not experienced recurrent hospitalization for >2 years.