Automated functional imaging in atrioventricular delay time optimisation in patients with dual chamber pacemakers.

Assessment of the optimal atrioventricular delay in patients with dual chamber pacemakers using impedance cardiography and Doppler echocardiography

Importance of maintained atrio-ventricular synchrony in patients with pacemakers.

The effect of atrial contraction on cardiac function is reviewed in patients with dual chamber and rate-responsive ventricular pacemakers. The question posed was is there any haemodynamic, clinical or prognostic advantage of AV synchrony in dual chamber pacemakers in comparison to rate-responsive ventricular pacemakers? Optimal AV delay in dual chamber pacing favours cardiac performance at rest...

Intracardiac Atrial Signal Amplitude In Congenital And Acquired Complete Heart Block

BACKGROUND Good and reliable atrial sensing is a fundamental part of atrioventricular (AV) synchrony in dual chamber pacemakers. Due to the floating nature of atrial sensing electrode in single pass dual chamber pacemakers (VDD) compared with two-lead dual chamber pacemakers (DDD), they are more prone to atrial under-sensing and the resulting loss of AV synchrony. We hypothesized that there is ...

The Beneficial Effects of Individualizing Adequate Atrioventricular Delay in Dual Chamber Pacemakers

J Cardiol Curr Res 2016, 5(3): 00164 valve diastolic regurgitation. Therefore, the optimal AV delay is calculated as the long AV delay minus the difference of the time intervals of the QRS onset to mitral valve closure at short and long AV intervals [5]. The Optimal AV synchronization will not only maximize cardiac output by increasing ventricular preload and by lowering the mean atrial pressur...

Physiological importance of different atrioventricular intervals to improved exercise performance in patients with dual chamber pacemakers.

To determine the importance of different atrioventricular intervals during exercise in patients with dual chamber pacemakers, seven patients with complete heart block and sinus rhythm were exercised in different pacing modes and atrioventricular intervals: (a) ventricular inhibited (VVI) pacing with no synchronous atrial augmentation or rate responsiveness; (b) atrial synchronous ventricular or...