Document Detail


Heart rate variability in systemic hypertension.
MedLine Citation:
PMID:  8644660     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Low heart rate (HR) variability is a risk factor for cardiac mortality in various patient populations, but it has not been well established whether patients with long-standing hypertension have abnormalities in the autonomic modulation of HR. Time and frequency domain measures of HR variability were compared in randomly selected, age-matched populations of 188 normotensive and 168 hypertensive males (mean age 50 +/- 6 years for both). The standard deviation of the RR intervals was lower in the hypertensive subjects than in the normotensive ones (52 +/- 19 vs 59 +/- 20 mss; p <0.01), and the very low and low-frequency spectral components of HR variability analyzed as absolute units were reduced in the hypertensive patients relative to the normotensive controls (p <0.001 for both). Hypertensive subjects also had blunted changes of the normalized low- and high-frequency components in response to an upright (sitting) posture (NS) as compared with normotensive subjects (p <0.001 for both). Multiple regression analysis showed the standard deviation of the RR intervals to be predicted most strongly by systolic blood pressure, both in the patients with hypertension (beta--0.20, p=0.01) and in the normotensive subjects (beta--0.28, p=0.0002). After adjustment for the baseline differences in blood pressure and body mass index, none of the absolute measures of the HR variability or the responses of the normalized units of HR variability to a change in the body posture differed between the hypertensive subjects and normotensive controls. These data show that long-standing hypertension results in reduced overall HR variability and blunted autonomic responses to a change in body posture. Altered autonomic modulation of HR in hypertension is mainly due to elevated blood pressure and obesity in males with long-standing hypertension as compared with normotensive subjects.
Authors:
H V Huikuri; A Ylitalo; S M Pikkujämsä; M J Ikäheimo; K E Airaksinen; A O Rantala; M Lilja; Y A Kesäniemi
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of cardiology     Volume:  77     ISSN:  0002-9149     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  1996 May 
Date Detail:
Created Date:  1996-07-16     Completed Date:  1996-07-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1073-7     Citation Subset:  AIM; IM    
Affiliation:
Division of Cardiology and Atherosclerosis Research Group, Department of Internal Medicine and Biocenter Oulu, University of Oulu, Finland.
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MeSH Terms
Descriptor/Qualifier:
Adult
Antihypertensive Agents / therapeutic use
Autonomic Nervous System / physiopathology
Echocardiography
Health Behavior
Heart Rate*
Humans
Hypertension / drug therapy,  physiopathology*,  ultrasonography
Male
Middle Aged
Posture / physiology
Chemical
Reg. No./Substance:
0/Antihypertensive Agents

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


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