1. First-degree sinoatrial heart block: sinoatrial block in the sick-sinus syndrome.
- Author
-
Engel TR, Bond RC, and Schaal SF
- Subjects
- Arrhythmia, Sinus diagnosis, Female, Male, Syndrome, Arrhythmia, Sinus physiopathology, Heart Block physiopathology, Sinoatrial Block physiopathology, Sinoatrial Node physiopathology
- Abstract
Sinoatrial conduction time (SACT) was estimated from the delay in the atrial recovery period after premature depolarization applied in that portion of atrial diastole when increasing prematurity resulted in a constant recovery interval. In 20 normal patients SACT was 169 msec. +/- 91 (2 S.D.). At least nine of 19 patients with "sick-sinus syndrome" (SSS) demonstrated SACT that were longer than seen in these normal subjects. SACT was prolonged in seven of nine SSS patients with abnormal A-V nodal conduction. Among 10 SSS patients with normal A-V conduction, only two had prolonged SACT. This study identifies first-degree sinoatrial block as a frequent manifestation of SSS associated with the presence of A-V node conduction abnormalities.
- Published
- 1976
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