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- Title
Patterns of Atrioventricular Conduction During Postexercise Recovery in Patients with Atrial Fibrillation and Wolff-Parkinson-White Syndrome.
- Authors
Favale, Stefano; Minafra, Franchesco; Pitzalis, Maria Vittoria; Sorgente, Luigi; Rizzon, Paolo
- Abstract
The effects of the postexercise recovery phase on the functional anterograde conduction properties of the accessory pathway (AP) were evaluated. Twenty- nine patients with Wolff-Parkinson-White (WPW) syndrome were submitted lo supine maximal bicycle exercise testing. In seven patients (group I), in whom sustained atrial fibrillation (AF) could be induced by transesophageal pacing (TP), mean ventricular rate (MVR), the shortest R-R interval (SRR) between preexcited beats, and the observed percentage of preexcited beats were evaluated at rest, after each step of exercise and 2 minutes after the end of exercise. In 22 patients (group II), in whom sustained AF could not be induced. decremental TP was performed to evaluate the shortest atrial cycle length (SCL) with 1:1 conduction over AP at rest, after each step of exercise, and 2 minutes after the end of exercise. In four patients in group I, the protocol was repeated with atropine injected during the last minute of exercise. In 12 patients (three from group land nine from group 11), catecholamine plasma levels were measured at rest, at peak exercise, and during recovery. MVR was 144 ± 20 beats/min at rest. 186 ± 21 beats/min at peak exercise (P < O.OO1 vs rest), and 179 ± 21 beats/min during recovery (P < 0.001 vs rest; P < 0.05 vs peak exercise). SRR was 289 ± 73 msec at rest, 223 ± 25 msec at peak exercise (P < 0.05 vs rest), and 227 ± 29 msec during recovery. Preexcited beat percentage was 95.4 ± 12 at rest, 35.2 ± 24.2 at peak exercise (P < 0.001 vs rest), and 85.1 ± 22.5 during recovery (P< 0.01 vs peak exercise and n.s.vs rest). In patients in whom atropine was injected MVR was 139 ± 17 beats/min at rest, 184 ± 19 beats/min at peak exercise (P < 0.05 vs rest), and 172 ± 16 beats/min during recovery (P < 0.05 vs peak exercise, P lt; 0.05 vs rest); SRR was 320 ± 71 msec at rest, 225 ± 25...
- Subjects
WOLFF-Parkinson-White syndrome; ARRHYTHMIA; EXERCISE tests; MEDICAL function tests; CARDIAC pacemakers
- Publication
Pacing & Clinical Electrophysiology, 1991, Vol 14, Issue 11, p1622
- ISSN
0147-8389
- Publication type
Article
- DOI
10.1111/j.1540-8159.1991.tb02738.x