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Effect of nerve block on response of forearm blood flow to local temperature.
J Appl Physiol (1985) ; 61(1): 227-32, 1986 Jul.
Article en En | MEDLINE | ID: mdl-3733608
To determine the role of neurotransmitter in the response of forearm blood flow (ABF) to local (forearm) skin temperature (Tsk) we measured ABF of six subjects at Tsk from 25 to 40 degrees C before (control) and after brachial plexus block (BPB). Control experiments were conducted in an ambient temperature of 27-29 degrees C, adjusted to minimize the subject's overall thermal sensation. Tsk was regulated by blowing a controlled-temperature airstream through a plastic bag enclosing the arm. We first lowered Tsk to 25 degrees C and after 20 min began to measure ABF with Whitney strain gauges. We then raised Tsk by 2.5 degrees C steps to 40 degrees C and measured ABF every 30 s for at least 10 min at each level of Tsk. Mean ABF rose from 1.1 ml X 100 ml-1 X min-1 at Tsk of 25 degrees C to 2.1 ml X 100 ml-1 X min-1 at 32.5 degrees C to 13.7 ml X 100 ml-1 X min-1 at 40 degrees C in control experiments and from 2.8 to 4.4 to 14.8 ml X 100 ml-1 X min-1 after BPB. The effect of Tsk on ABF was highly significant (P less than 0.0001) but the effect of BPB was not (P approximately equal to 0.2). At thermoneutrality, the effect of Tsk on ABF is largely independent of neural activity, since this effect is unaffected by nerve block.
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Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Temperatura Cutánea / Plexo Braquial / Antebrazo / Bloqueo Nervioso Límite: Adult / Female / Humans / Male Idioma: En Revista: J Appl Physiol (1985) Asunto de la revista: FISIOLOGIA Año: 1986 Tipo del documento: Article
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Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Temperatura Cutánea / Plexo Braquial / Antebrazo / Bloqueo Nervioso Límite: Adult / Female / Humans / Male Idioma: En Revista: J Appl Physiol (1985) Asunto de la revista: FISIOLOGIA Año: 1986 Tipo del documento: Article