Which is least likely to occur in a patient with a core body temperature between 89°F (32°C) and 92°F (33°C)?

Which is least likely to occur in a patient with a core body temperature between 89°F (32°C) and 92°F (33°C)?

• A. Shivering
• B. Confusion
• C. Pallor
• D. Tachycardia

Answer: (D)

At this level of hypothermia, the body's responses shift toward conserving heat and protecting vital functions, and brain function is noticeably affected. Shivering is a common early defense to generate heat, but as cooling deepens, shivering can wane. Pallor appears from peripheral vasoconstriction, helping to preserve core warmth. Confusion or altered mental status is typical due to reduced cerebral function from the cold. In contrast, a fast heart rate is not typical here; the heart rate tends to slow down (bradycardia) and rhythms can become irregular as the body cools further. So tachycardia is the least likely finding in this temperature range.

At this level of hypothermia, the body's responses shift toward conserving heat and protecting vital functions, and brain function is noticeably affected. Shivering is a common early defense to generate heat, but as cooling deepens, shivering can wane. Pallor appears from peripheral vasoconstriction, helping to preserve core warmth. Confusion or altered mental status is typical due to reduced cerebral function from the cold. In contrast, a fast heart rate is not typical here; the heart rate tends to slow down (bradycardia) and rhythms can become irregular as the body cools further. So tachycardia is the least likely finding in this temperature range.