atrioventricular (AV) sequential pacemaker
- atrioventricular (AV) sequential pacemaker
- an artificial cardiac pacemaker used in patients with abnormal sinus node function and impaired AV conduction; it senses ventricular, and sometimes atrial, activity and in addition to stimulating the atrium also stimulates the ventricle after an appropriate delay. Committed versions invariably deliver the ventricular stimulus while noncommitted versions deliver it only in the absence of interim ventricular activity. See also DVI p., DDD p., and DDI p.
Medical dictionary.
2011.
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Pacemaker — A system that sends electrical impulses to the heart in order to set the heart rhythm. The pacemaker can be the normal natural pacemaker of the heart or it can be an electronic device. The natural pacemaker of the heart is the sinus node, one of… … Medical dictionary
DDI pacemaker — a type of atrioventricular sequential pacemaker that delivers impulses to the atrium and ventricles on the basis of sensed ventricular and atrial activity, although the latter can only inhibit atrial impulses and cannot trigger ventricular… … Medical dictionary
DVI pacemaker — a type of atrioventricular sequential pacemaker that delivers impulses to the atrium and ventricle on the basis of sensed ventricular activity only. Cf. DDI p. and DDD p … Medical dictionary
rhythm — 1. Measured time or motion; the regular alternation of two or more different or opposite states. 2. SYN: r. method. 3. Regular or irregular occurrence of an electrical event in the electrocardiogram or electroencephalogram. SEE ALSO: wave. 4.… … Medical dictionary
