Document Detail

Validity of auscultatory and Penaz blood pressure measurements during profound heat stress alone and with an orthostatic challenge.
MedLine Citation:
PMID:  21832209     Owner:  NLM     Status:  MEDLINE    
Despite frequent reporting of blood pressure (BP) during profound passive heat stress, both with and without a hypotensive challenge, the method by which BP is measured often varies between laboratories. It is unknown whether auscultatory and finger BP measures accurately reflect intra-arterial BP during dynamic changes in cardiac output and peripheral resistance associated with the aforementioned conditions. The purpose of this investigation was to test the hypothesis that auscultatory BP measured at the brachial artery, and finger BP measured by the Penaz method, are valid measures of intra-arterial BP during a passive heat stress and a heat-stressed orthostatic challenge, via lower body negative pressure (LBNP). Absolute (specific aim 1) and the change in (specific aim 2) systolic (SBP), diastolic (DBP), and mean BPs (MBP) were compared at normothermia, after a core temperature increase of 1.47 ± 0.09°C, and during subsequent LBNP. Heat stress did not change auscultatory SBP (6 ± 11 mmHg; P = 0.16), but Penaz SBP (-22 ± 16 mmHg; P < 0.001) and intra-arterial SBP (-11 ± 13 mmHg P = 0.017) decreased. In contrast, DBP and MBP did not differ between methods throughout heat stress. Compared with BP before LBNP, the magnitude of the reduction in BP with all three methods was similar throughout LBNP (P > 0.05). In conclusion, auscultatory SBP and Penaz SBP failed to track the decrease in intra-arterial SBP that occurred during the profound heat stress, while decreases in arterial BP during an orthostatic challenge are comparable between methodologies.
Matthew S Ganio; R Matthew Brothers; Rebekah A I Lucas; Jeffrey L Hastings; Craig G Crandall
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Validation Studies     Date:  2011-08-10
Journal Detail:
Title:  American journal of physiology. Regulatory, integrative and comparative physiology     Volume:  301     ISSN:  1522-1490     ISO Abbreviation:  Am. J. Physiol. Regul. Integr. Comp. Physiol.     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-03     Completed Date:  2011-12-22     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  100901230     Medline TA:  Am J Physiol Regul Integr Comp Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  R1510-6     Citation Subset:  IM    
Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, and University of Texas Southwestern Medical Center, Dallas, Texas, USA.
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MeSH Terms
Analysis of Variance
Auscultation* / instrumentation
Blood Pressure*
Blood Pressure Determination / instrumentation,  methods*
Body Temperature Regulation
Brachial Artery / physiopathology*
Dizziness / physiopathology*
Equipment Design
Fingers / blood supply*
Heart Rate
Heat Stress Disorders / physiopathology*
Lower Body Negative Pressure
Middle Aged
Predictive Value of Tests
Reproducibility of Results
Skin Temperature
Time Factors
Grant Support

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

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