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Immediate effect on cardiac output of reversion to sinus rhythm from rapid arrhythmias.

Authors
  • Wright, J S
  • Fabian, J
  • Epstein, E J
Type
Published Article
Journal
BMJ
Publisher
BMJ
Publication Date
Aug 08, 1970
Volume
3
Issue
5718
Pages
315–318
Identifiers
PMID: 5451953
Source
Medline
License
Unknown

Abstract

Cardiac output was estimated immediately before and after conversion to sinus rhythm in nine patients with rapid arrhythmias. Conversion was by synchronized direct-current shock in eight patients, and by direct atrial wall stimulation in the other. In seven patients there was an immediate increase in cardiac output after restoration of sinus rhythm. The percentage increase in output was directly proportional to the rate of the arrhythmia immediately before conversion (r=0.91, P<0.01). The critical heart rate, above which an immediate increase in cardiac output might be expected on conversion to sinus rhythm, appeared in these patients to be about 160 beats per minute.

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