Two-to-one sinoatrial block. Normalization by carotid massage.
In a clinical case of 2:1 sinoatrial block, carotid massage, paradoxically, released the sinoatrial block and doubled the manifest sinus rate. This resulted from a deceleration of the sinus discharge rate which allowed consecutive sinus impulses to traverse the sinoatrial junction.
Littmann
L
L
3rd Department of Medicine, Semmelweis University Medical School, Budapest, Hungary.
Tenczer
J
J
Svenson
R H
RH
D000368:Aged; D002346:Carotid Sinus / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000628:therapy*; D006801:Humans; D008405:Massage; D012848:Sinoatrial Block / Q000503:physiopathology / Q000628:therapy*