Document Detail


Effect of digital nerve blockade on heat-induced vasoconstriction in the human finger.
MedLine Citation:
PMID:  7759449     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The present study was performed to investigate the mechanism of heat-induced vasoconstriction (HIVC) in human fingers. The left fingers of five male subjects were immersed in water controlled at an initial temperature of 35.0 degrees C. The blood flows (BF) of the left index and fourth fingers were measured continuously with laser-Doppler flowmeter probes, and the temperatures of the middle finger and water bath were also monitored continuously using thermistor probes. Arterial blood pressure and heart rate were measured every minute before and during local finger warming. A local anesthetic (0.5% bupivacaine hydrochloride) or saline at a volume of 5.0-8.0 ml was aseptically injected into the base of the fourth or index finger, respectively. After finger BFs had been stabilized for > or = 10 min, the fingers were warmed by raising the water bath temperature from 35.0 to 41.5 degrees C in 14 min. The BF of the index finger fell significantly for 6 min after local warming was commenced (at water bath temperatures between 35.5 and 37.5 degrees C) without associated changes in mean arterial blood pressure, indicating the occurrence of HIVC. Then BF increased toward prewarming levels. The local anesthetic injection, however, completely abolished HIVC in the fourth finger. These results suggest that, in humans, innervation to finger vessels is indispensable for producing HIVC and hence that a local mechanism, such as myogenic vascular response to high temperature, may not be involved in the induction of HIVC.
Authors:
S Sakurada; O Shido; K Yamamoto; N Sugimoto; T Kobayashi; T Nagasaka
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Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  78     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1995 Feb 
Date Detail:
Created Date:  1995-06-29     Completed Date:  1995-06-29     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  746-9     Citation Subset:  IM    
Affiliation:
Department of Physiology, School of Medicine, Kanazawa University, Japan.
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MeSH Terms
Descriptor/Qualifier:
Blood Pressure / physiology
Body Temperature Regulation / physiology
Fingers / blood supply*,  innervation,  physiology
Heart Rate / physiology
Hot Temperature
Humans
Male
Nerve Block*
Ulnar Nerve / physiology
Vasoconstriction / physiology*

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


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