Prolonged unintended brain cooling may inhibit recovery from brain injuries: case study and literature review.

Abstract:

BACKGROUND:Tracheal intubation of comatose patients is common, but contrary to most standards for respiratory care, heated nebulizers are not always used. This deviation from recommendations appears to be widespread. CASE REPORT:In the case examined, a tracheotomized patient suffering from severe anoxic brain injury was unintentionally exposed to chilled air, 17 degrees C (63 degrees F) at the cannula, for a period of 31 months. A month after upper respiratory tract warming was restored the vegetative state lifted, as marked by the patient's ability to verbalize responses to questions. CONCLUSIONS:This clinical experience led us to a review of the literature. Among other findings, we learned that brain temperature is strongly affected by the temperature of arterial blood flow. Arterial blood, in turn, is strongly affected by the air temperature in the lungs. Experiments have shown that the introduction of colder air in the lungs will produce rapid cooling of at least some surface brain tissues. Chilled aortic blood is also more viscous and less efficient in transfer of oxygen. Hypothermia of brain tissue may significantly affect the endocrine system and neurochemistry. Through inferences from the literature, we also identify other possible effects. We hypothesize that intubated delivery of air into the lungs at a temperature significantly below body temperature, especially over a prolonged period, is likely to inhibit recovery and may even produce iatrogenic effects. We recommend the use of heated nebulizers. Research strategies are recommended.

journal_name

Med Sci Monit

authors

Ford GP,Reardon DC

subject

Has Abstract

pub_date

2006-08-01 00:00:00

pages

CS74-9

issue

8

eissn

1234-1010

issn

1643-3750

pii

8795

journal_volume

12

pub_type

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