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Physiology

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Central Nervous System

Question
2 out of 18
 

Which deleterious effect is least likely to occur in hypothermia (AIIMS NOV.2011)



A Cardiac arrhythmia

B Decreased peripheral resistance

C Reversible coagulation

D Renal failure

Ans. B Decreased peripheral resistance Rosen's emergency medicine: concepts and clinical practice.

a. Hypothermia is a condition in which core temperature drops below the required temperature for normal metabolism and body functions which is defined as 35.0 °C (95.0 °F).

b. Body temperature is usually maintained near a constant level of 36.5–37.5 °C (98–100 °F) through biologic homeostasis or thermoregulation.

c. If exposed to cold and the internal mechanisms are unable to replenish the heat that is being lost, a drop in core temperature occurs.

d. As body temperature decreases, characteristic symptoms occur such as shivering and mental confusion.

e. The classical ECG finding of hypothermia is the Osborn J wave. Also, ventricular fibrillation frequently occurs at <28°C (82.4°F) and asystole at <20°C (68°F).

f. The Osborn J may look very similar to those of an acute ST elevation myocardial infarction.Thrombolysis as a reaction to the presence of Osborn J waves is not indicated, as it would only worsen the underlying coagulopathy caused by hypothermia.

g. Hypothermia is also associated with a lower clotting threshold and reversible coagulation.

h. Peripheral resistance is increased due to vasoconstriction caused by hypothermia.

Central Nervous System Flashcard List

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