| Apparent bradycardia-dependent sinoatrial block associated with respiration. | |
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MedLine Citation:
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PMID: 11099362 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In our previous patients, apparent bradycardia-dependent block has been shown in the atrioventricular (AV) junction and in the accessory pathway. It was suggested that these previous cases were not of true bradycardia-dependent block; namely, that, as a result of periodic increases in vagal tone associated with respiration, conductivity in the AV junction or in the accessory pathway was depressed to a greater degree than automaticity in the sinus node. In the present article, 3 patients with frequent sinoatrial (SA) block were reported. In 1 patient, sinus escape-capture bigeminy caused by SA block was found. In these present patients, when the sinus cycle lengthened, SA block occurred. The purpose of the present article is to show that the patients have apparent bradycardia-dependent SA block, namely, not true bradycardia-dependent SA block. In all patients, the respiration curve was recorded simultaneously with the electrocardiogram. In all patients, during inspiration, the sinus cycle gradually shortened; on the other hand, during expiration, the sinus cycle gradually lengthened, and then a sinus impulse was blocked in the SA junction. These findings suggested that increased vagal tone during expiration depressed conductivity in the SA junction to a greater degree than automaticity in the sinus node. |
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Authors:
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T Katoh; S Kinoshita; Y Tsujumura; Y Sasaki |
Publication Detail:
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Type: Case Reports; Comparative Study; Journal Article |
Journal Detail:
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Title: Journal of electrocardiology Volume: 33 ISSN: 0022-0736 ISO Abbreviation: J Electrocardiol Publication Date: 2000 Oct |
Date Detail:
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Created Date: 2001-03-06 Completed Date: 2001-05-31 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0153605 Medline TA: J Electrocardiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 375-80 Citation Subset: IM |
Affiliation:
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Katoh Cardiovascular Clinic, Ohtsu, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Bradycardia
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diagnosis,
physiopathology* Diagnosis, Differential Female Humans Male Middle Aged Ovum* Respiration* Sinoatrial Block / diagnosis, physiopathology* Sinoatrial Node / physiopathology Vagus Nerve / physiopathology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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