Certified Transport Registered Nurse Certification Practice Exam

Which of the following is a consequence of hypothermia?

1. Increased metabolism

2. Decreased heart rate

3. Enhanced drug efficacy

4. Improved oxygen transport

The correct answer is: Decreased heart rate

Hypothermia leads to a drop in body temperature which significantly impacts physiological functions. One of the primary consequences of hypothermia is a decreased heart rate, known as bradycardia. When the body's temperature falls, the heart's electrical signals slow down, resulting in a lower heart rate. This is a protective response from the body, attempting to conserve energy when metabolic activity is diminished due to the cold. The other options describe processes that generally do not occur in response to hypothermia. Increased metabolism typically occurs as the body fights to maintain its temperature, leading to increased heart rates in normal conditions. In the case of hypothermia, metabolism would actually slow down. Enhanced drug efficacy and improved oxygen transport are also not accurate, as the body functions are typically compromised during hypothermia, leading to various physiological impairments rather than enhancements. Therefore, recognizing the association between hypothermia and bradycardia is crucial, as it underscores the body's efforts to adapt to low temperatures and highlights the importance of monitoring vital signs in hypothermic patients.