Feasibility of physiological pacing rate in cardiac resynchronization therapy.

Aims: Although cardiac resynchronization therapy (CRT) improves functional capacity in heart failure patients, a blunted heart rate (HR) response remains after treatment. So we aimed to evaluate the feasibility of the physiological pacing rate (PPR) in CRT patients.

Methods: A cohort of 30 clinical mildly symptomatic CRT patients underwent the six-minute walk test (6MWT).