Document Detail


Exercise stress-induced changes in systemic arterial potassium in angina pectoris.
MedLine Citation:
PMID:  2729129     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Large fluctuations in systemic arterial potassium have been found during and after exercise in normal subjects. To determine whether similar changes occur in patients with angina pectoris, arterial potassium levels were measured before, during and immediately after maximal bicycle exercise in 20 patients with exertional angina. In 10 of these patients, leg blood flow and arteriovenous potassium levels also were measured. During exercise, arterial potassium increased significantly both from rest to submaximal exercise (4.3 +/- 0.1 to 4.7 +/- 0.1 mmol/liter, p less than 0.01) and from submaximal to maximal exercise (5.4 +/- 0.1 mmol/liter, p less than 0.01). Within 1 minute of cessation of exercise, arterial potassium had decreased to 4.7 +/- 0.1 mmol/liter (p less than 0.001) and continued to decrease to a minimum of 4.1 +/- 0.1 mmol/liter between 3 and 5 minutes after exercise, significantly less than the rest value (p less than 0.05). At maximal exercise (99 +/- 9 watts), the calculated release of potassium from each leg reached 2.7 +/- 1.3 mmol/min. Four minutes after exercise, the leg muscles were resorbing potassium at 0.24 mmol/min. In these patients with exertional myocardial ischemia, the magnitude and rapidity of arterial potassium changes during and after exercise resemble those found in normal subjects, but occurred at much lower workloads. Release and resorption of potassium by exercising muscle in patients with angina pectoris may cause potentially arrhythmogenic arterial potassium fluctuations.
Authors:
A Thomson; D T Kelly
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of cardiology     Volume:  63     ISSN:  0002-9149     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  1989 Jun 
Date Detail:
Created Date:  1989-07-12     Completed Date:  1989-07-12     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1435-40     Citation Subset:  AIM; IM    
Affiliation:
Hallstrom Institute of Cardiology, Royal Prince Alfred Hospital, Sydney, Australia.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Angina Pectoris / blood*
Arrhythmias, Cardiac / etiology
Arteries
Electrocardiography
Heart Rate
Humans
Lactates / blood
Leg / blood supply
Male
Physical Exertion*
Potassium / blood*
Regional Blood Flow
Chemical
Reg. No./Substance:
0/Lactates; 7440-09-7/Potassium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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