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European Heart Journal 1992 13(4):464-472;
Copyright © 1992 by the European Society of Cardiology.
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© 1992 The European Society of Cardiology

The effect of atrio-ventricular delay programming in patients with DDDR pacemakers

A. N. SULKE, J. B. CHAMBERS and E. SOWTON

Department of Cardiology, Guy's Hospital London, U.K.

Received 30 January 1991; revised 5 June 1991; .

Correspondence Dr A. N Sulke. Department of Cardiolog . Guy's Hospital. St Thomas Street. London SE1 9RT. U.K.

Abstract

Modern DDDR (dual chamber universal, rate responsive) pacemakers are complex, hugely capable devices incorporating new features that theoretically should enhance haemodynamics and therefore quality of life. Ten patients (mean age 48 years) with chronotropic incompetence and high grade A-V block had activity sensing DDDR devices implanted and underwent a randomized double-blind crossover assessment of rate responsive and different fixed atrio-ventricular delay (AVD) settings during 2 weeks of out-of-hospital activity in DDDR mode. Subjective assessment showed improved ‘general wellbeing’ and preference for 175 ms rate responsive AVD (P <0.01) or 125 ms fixed AVD (P < 0.05). The longest fixed AVD setting (250 ms) was least acceptable and had increased symptom prevalence (P <0.02). Perceived exercise capacity and exercise treadmill tolerance was not significantly dfferent at any setting in DDDR mode but was less in DDD mode. Echocardiographically derived stroke distance was greater at 125 ms AVD than 250 ms at 100 b . min–1 (P <0.05) but did not differ at slower heart rates at any AVD. Colour Doppler assessed mitral and tricuspid regurgitation was greatest at 250 ms AVD at all heart rates but did not correlate with increased symptomatology. Stroke distance evaluated from the mitral inflow velocity profile allows improved AVD programming during DDDR pacing. Rate adaptive A-V delay is a useful feature during DDDR pacing.

Key Words: DDDR pacemakers • rate responsive A-V delay • comparison study • stroke distance • out of hospital activity


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