Abstract
Although DDD mode physiologic pacing has a superior function to VVI pacing, A-V sequential pacing is often not necessary. We challenged to study which factor is most important for determining cases who truly require DDD pacing, by changing patient's pacing-mode from DDD to VVI. We divided 40 patients in two groups (symptomatic; Group. 1, asymptomatic; Group. 2). First, Group. 1 was older than Group. 2 (average 66.9 to 63.1). Secondly, cardiac function (EF. % FS. mVcf) and hemodynamic regulation in Group. 1 were detereiolated compared to those in Group. 2. Our data demonstrated three factors; eg. 1) older age, 2) deteriolated cardiac function, 3) failure of hemodynamic regulation are important for decision making on pacemaker selection.
