Flat Belly Fix Review In the end, a pacemaker was placed to keep his heart rate constant. The doctors observed that his arrhythmias began while he slept, at which time his heart rate slowed down. Time passed and the cause of Lech's ventricular fibrillation continued without a clear diagnosis. Father and son returned to Poland , and on his return, Wockeczek brought the professor the electrocardiogram of his previous deceased daughter, Eva.