| VALIDITY OF AUSCULTATORY AND PENAZ BLOOD PRESSURE MEASUREMENTS DURING PROFOUND HEAT STRESS ALONE AND WITH AN ORTHOSTATIC CHALLENGE. | |
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MedLine Citation:
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PMID: 21832209 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Despite frequent reporting of blood pressure during profound passive heat stress, both with and without a hypotensive challenge, the method by which blood pressure is measured often varies between laboratories. It is unknown whether auscultatory and finger blood pressure measures accurately reflect intra-arterial blood pressure 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 blood pressure (BP(AUSC)) measured at the brachial artery, and finger blood pressure measured by the Penaz method (BP(PENAZ)), are valid measures of intra-arterial blood pressure (BP(INTRA)) 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, diastolic, and mean blood pressures (SBP, DBP, MBP, respectively) were compared at normothermia, after a core temperature increase of 1.47±0.09°C and during subsequent LBNP. Heat stress did not change SBP(AUSC) (6 ±11 mmHg; P = 0.16), but SBP(PENAZ) (-22 ±16 mmHg; P<0.001) and SBP(INTRA) (-11±13 mmHg P=0.017) decreased. In contrast, DBP and MBP did not differ between methods throughout heat stress. Compared to blood pressure prior to LBNP, the magnitude of the reduction in blood pressure with all 3 methods were similar throughout LBNP (P>0.05). In conclusion, SBP(AUSC) and SBP(PENAZ) failed to track the decrease in SBP(INTRA) that occurred during the profound heat stress, while decreases in arterial blood pressure during an orthostatic challenge are comparable between methodologies. |
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Authors:
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Matthew S Ganio; R Matthew Brothers; Rebekah A I Lucas; Jeffrey L Hastings; Craig G Crandall |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-8-10 |
Journal Detail:
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Title: American journal of physiology. Regulatory, integrative and comparative physiology Volume: - ISSN: 1522-1490 ISO Abbreviation: - Publication Date: 2011 Aug |
Date Detail:
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Created Date: 2011-8-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100901230 Medline TA: Am J Physiol Regul Integr Comp Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1Institute for Exercise and Environmental Medicine. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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