The Acute Hemodynamic Effects Of VVI, AAI And DDD Pacing

Objective To evaluate the acute hemodynamic effects of AM, VVI and DDD pacing. Method 14. patients with symptomatic sick sinus syndrome were tested during pacemaker implantation :9 patients were found with venlriculoaUial conduction (group 1) and 5 patients without it (group 2). Mean right aUial pressure (RAP) , mean pulmonaiy aitely pressure (PAP) and mean pulmonaiy capilaiy wedge pressure (PCWP) were measured by Swan - Ganz catheterization, cardiac output (CO) was detemiined by the thennodilution technique, mean aitery pressure (MAP) was measured by no - invasive way. Pressures and CO were measured at spontaneous rhythm as baseline and during AAI , VVI and DDD pacing. Results (I) No significant difference in MAP was observed among the three pacing modes and spontaneous rhythm . (~) During AM, DDD pacing, no significant changes were observed for RAP , PAP , PCWP compared with spontaneous rhythm, but CO significantly increased (p