Document Detail


Patterns and behavior of transient myocardial ischemia in stable coronary disease are the same in both men and women: a comparative study.
MedLine Citation:
PMID:  8636547     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: This study sought to compare the circadian variations in transient ischemic activity, mean heart rate and ischemic threshold between women and men with coronary artery disease. BACKGROUND: There is a circadian variation in ischemic activity, onset of myocardial infarction and sudden cardiac death in patients with coronary artery disease, but studies assessing ischemia have incorporated predominantly male subjects. METHODS: Thirty-one women and 45 men underwent at least 48 h of ambulatory ST segment monitoring. RESULTS: There was a similar and significant circadian variation in ischemic activity in both women and men (p < 0.0001 and p < 0.0001, respectively), with a trough at night, a surge in the morning and a peak between 1 and 2 PM, corresponding to a similar circadian variation in mean hourly heart rate (p < 0.0001) that was not different between men and women (p = 0.28, power to detect a shift 99.9%). Mean heart rate at onset of ischemia (ischemic threshold) had similar variability in women and men (p = 0.96), and harmonic regression analysis confirmed a significant circadian variation (p < 0.0001), with a trough at night and a peak during activity hours. Heart rate increased significantly in the 5 min before ischemia throughout the 24 h (p < 0.0001), with no gender differences in the pattern of preonset to onset heart rate changes over time (p = 0.52); the smallest differences were recorded in the middle of the night. The majority of ischemic episodes (80%) had a heart rate increase > 5 beats/min in the 5 min before ischemia, but there were no gender differences. CONCLUSIONS: Women with coronary artery disease have a pattern of ischemic activity and underlying pathophysiologic mechanisms very similar to men. The importance of increase in myocardial oxygen demand in the genesis of ischemia in both men and women is reflected by similar magnitude of heart rate increases before ischemia. The lower ischemic threshold during the nocturnal hours, when blood pressure is also lower, is consistent with a circadian variation in underlying coronary vascular tone.
Authors:
D Mulcahy; N Dakak; G Zalos; N P Andrews; M Proschan; M A Waclawiw; W H Schenke; A A Quyyumi
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of the American College of Cardiology     Volume:  27     ISSN:  0735-1097     ISO Abbreviation:  J. Am. Coll. Cardiol.     Publication Date:  1996 Jun 
Date Detail:
Created Date:  1996-07-11     Completed Date:  1996-07-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8301365     Medline TA:  J Am Coll Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1629-36     Citation Subset:  AIM; IM    
Affiliation:
Cardiology Branch of Biostatistics Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
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MeSH Terms
Descriptor/Qualifier:
Acute Disease
Circadian Rhythm*
Coronary Disease / physiopathology*
Electrocardiography, Ambulatory
Exercise Test
Female
Heart Rate
Humans
Male
Middle Aged
Myocardial Ischemia / physiopathology*
Sex Characteristics

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


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