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  • Title: First-degree sinoatrial heart block: sinoatrial block in the sick-sinus syndrome.
    Author: Engel TR, Bond RC, Schaal SF.
    Journal: Am Heart J; 1976 Mar; 91(3):303-10. PubMed ID: 1258728.
    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.
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