Voluntary respiratory control and cerebral blood flow velocity upon ice-water immersion.

Voluntary respiratory control and cerebral blood flow velocity upon ice-water immersion. Research Abstract Details 

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Voluntary respiratory control and cerebral blood flow velocity upon ice-water immersion. Abstract Text:

INTRODUCTION: In non-habituated subjects, cold-shock response to cold-water immersion causes rapid reduction in cerebral blood flow velocity (approximately 50%) due to hyperventilation, increasing risk of syncope, aspiration, and drowning. Adaptation to the response is possible, but requires several cold immersions. This study examines whether thorough instruction enables non-habituated persons to attenuate the ventilatory component of cold-shock response. METHODS: There were nine volunteers (four women) who were lowered into a 0 degrees C immersion tank for 60 s. Middle cerebral artery mean velocity (CBFV) was measured together with ventilatory parameters and heart rate before, during, and after immersion. RESULTS: Within seconds after immersion in ice-water, heart rate increased significantly from 95 +/- 8 to 126 +/- 7 bpm (mean +/- SEM). Immersion was associated with an elevation in respiratory rate (from 12 +/- 3 to 21 +/- 5 breaths, min(-1)) and tidal volume (1022 +/- 142 to 1992 +/- 253 ml). Though end-tidal carbon dioxide tension decreased from 4.9 +/- 0.13 to 3.9 +/- 0.21 kPa, CBFV was insignificantly reduced by 7 +/- 4% during immersion with a brief nadir of 21 +/- 4%. DISCUSSION: Even without prior cold-water experience, subjects were able to suppress reflex hyperventilation following ice-water immersion, maintaining the cerebral blood flow velocity at a level not associated with impaired consciousness. This study implies that those susceptible to accidental cold-water immersion could benefit from education in cold-shock response and the possibility of reducing the ventilatory response voluntarily.

Voluntary respiratory control and cerebral blood flow velocity upon ice-water immersion. Publishing Authors By Initials

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Voluntary respiratory control and cerebral blood flow velocity upon ice-water immersion. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Aviation, space, and environmental medicine

VOLUME: 79

Page Numbers: 765-8

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ISSN: 0095-6562

DAY: 22

MONTH: Aug

YEAR: 2008

Voluntary respiratory control and cerebral blood flow velocity upon ice-water immersion. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Voluntary respiratory control and cerebral blood flow velocity upon ice-water immersion.

AFFILIATION: Department of Anaesthesia and Intensive Care, Bispebjerg Hospital, Copenhagen, Denmark. temantoni@hotmail.com

Country: United States

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MEDLINETA: Aviat Space Environ Med

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