Document Detail


Does it matter whether blood pressure measurements are taken with subjects sitting or supine?
MedLine Citation:
PMID:  9557918     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Several guidelines for the management of hypertension do not give special preference to a specific position of the patient during blood pressure measurement, suggesting that blood pressure readings taken with patients sitting and with patients supine are interchangeable. OBJECTIVE: To test whether there is any difference between the blood pressure readings with patients sitting and supine. DESIGN AND METHODS: Blood pressure and heart rate were measured three times each for 245 subjects (171 hypertensives), with subjects both sitting and supine, simultaneously on both arms, with a Hawksley random-zero sphygmomanometer on the right arm and a semi-automatic oscillometric device (Bosomat) on the left arm. The sequence of the two positions was randomized. The procedure was repeated on a second occasion for 49 subjects (41 hypertensives) with the sequence of the positions reversed. Because there was no systematic difference among the three readings per position, the averages of the three blood pressure and heart rate readings with subjects sitting and supine were compared and the influences of age, body mass index, hypertension and medication on the difference were examined. RESULTS: We found no influence of the subject's body posture on the systolic blood pressure. We found a higher diastolic blood pressure [by 5.2+/-0.4 mmHg (mean+/-SEM), P< 0.001 with Hawksley random-zero sphygmomanometer] and a greater heart rate [by 1.5+/-0.3 beats/min (mean+/-SEM), P< 0.001] with subjects sitting. The sitting minus supine differences for diastolic blood pressure and heart rate decreased significantly with increasing age (P< 0.001). We found no effect of body mass index, hypertension and medication on the sitting - supine differences. CONCLUSIONS: The subject's body posture influenced especially the diastolic blood pressure and heart rate, both of them being significantly higher with patients sitting rather than supine. This effect decreased with age. Thus, for indirect blood pressure measurement, diastolic blood pressure values obtained with subjects sitting and supine cannot automatically be regarded as equivalent.
Authors:
R T Netea; P Smits; J W Lenders; T Thien
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of hypertension     Volume:  16     ISSN:  0263-6352     ISO Abbreviation:  J. Hypertens.     Publication Date:  1998 Mar 
Date Detail:
Created Date:  1998-06-16     Completed Date:  1998-06-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8306882     Medline TA:  J Hypertens     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  263-8     Citation Subset:  IM; S    
Affiliation:
Department of Internal Medicine, University Hospital Nijmegen, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Aged, 80 and over
Aging / physiology
Antihypertensive Agents / therapeutic use
Blood Pressure
Blood Pressure Determination / methods*
Body Mass Index
Diastole
Female
Heart Rate
Humans
Hypertension / diagnosis*,  drug therapy,  physiopathology*
Male
Middle Aged
Posture / physiology*
Supine Position / physiology
Systole
Chemical
Reg. No./Substance:
0/Antihypertensive Agents

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


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