At the time of<unk>  implantation, AV synchrony should be optimized to prevent the occurrence of<unk> . Where patients with optimized AV synchrony have shown great results of implantation and very low incidence of<unk>  than those with suboptimal AV synchronization.
Pacemaker syndrome
Pre-excitation syndrome
Takotsubo cardiomyopathy
Torsades de pointes
Primary ventricular fibrillation
Aicardi syndrome
Unstable angina
Sudden arrhythmic death syndrome