Comparison of cardiac function between right ventricular septal pacing and right ventricular apex pacing

AIM:To compare the cardiac function between right ventricular septal pacing and right ventricular apex pacing.METHODS:A total of 180 cases were randomly divided into ventricular septal pacing group(n=98 cases)and apex pacing group(n=82).Changes in the echocardiogram of the two groups were compared before surgery and 1.5 years after surgery.RESULTS:Left ventricular ejection fraction(LVEF)in septal group increased [(66±8)% vs.(69±9)%,P0.01],stroke volume(SV)increased [(83±1)ml vs.(87±12)ml,P0.01],left ventricular end-diastolic diameter(LVEDD)decreased [(52±5)mm vs.(51±5)mm],and no significant change was found in left ventricular end-systolic diameter(LVESD)[(31±5)mm vs.(31±5)mm].In apex group,LVEF significantly decreased [(68±7)% vs.(63±8)%,P0.01],SV significantly decreased [(87±16)ml vs.(80±10)ml,P0.01],and a significant increase was found in LVEDD [(50±6)mm vs.(53±7)mm,P0.01] and in LVESD [(30±5)mm vs.(32±6)mm,P0.05].Eighteen months after operation,LVEF(P0.01)and SV(P0.05)were significantly different between groups.Pre-and postoperative difference between groups was statistically significant(P0.05).CONCLUSION:Ventricular septal pacing is superior to right ventricular apex pacing in improving cardiac function in patients with pacemaker implant.