[Bicameral (DDD) vs. monocameral (VVI) stimulation: echo Doppler study].
In 20 patients we measured the increase in stroke volume at rest with DDD compared with VVI pacing, using pulsed Doppler echocardiography at a pacing rate of 70 beats min. By using the apical two-chamber window, the stroke volume was assessed by measuring the integral wave of flow at the level of the aortic anulus, also the most favourable A-V delay was determined. The increase of stroke was comprised within 25.3% and 48.6%. The patients with increased heart size (atrial or ventricular chamber) or ventricular thickness and clinical or echocardiographic signs of heart failure were excluded to avoid variables too and to have an homogeneous group. This study confirms the hemodynamic effects of ventricular pacing, with and without atrio-ventricular synchrony in patients with normal left ventricular function. Doppler technique is useful in non invasive assessment of cardiac output in patients with or without physiologic pacemakers.
Minutiello
L
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Divisione di Cardiologia, Presidio Ospedaliero di Camerino (Macerata), Regione Marche-USL 20.
D000368:Aged; D001283:Atrioventricular Node / Q000000981:diagnostic imaging / Q000503:physiopathology; D002302:Cardiac Output; D002304:Cardiac Pacing, Artificial; D015150:Echocardiography, Doppler; D005260:Female; D006327:Heart Block / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000503:physiopathology; D006352:Heart Ventricles / Q000503:physiopathology; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D013318:Stroke Volume
Stimolazione bicamerale (DDD) versus stimolazione monocamerale (VVI): studio eco Doppler.