Registered Nurse (RN) Endocrine Licensure Exam

What symptom in a patient with hyperthyroidism could suggest a worsening condition and require immediate medical attention?

1. Weight gain.

2. Severe fatigue.

3. Increased sweating.

4. Rapid heart rate.

The correct answer is: Rapid heart rate.

A rapid heart rate, or tachycardia, in a patient with hyperthyroidism can indicate a worsening condition that requires immediate medical attention. Hyperthyroidism increases the metabolic rate, which often leads to symptoms such as increased heart rate, anxiety, and tremors. When the heart rate becomes significantly elevated, it poses a risk of serious complications such as thyroid storm, which is a life-threatening exacerbation of hyperthyroidism. This condition can lead to severe cardiovascular strain, heart failure, or other serious issues. While severe fatigue, increased sweating, and weight gain may be associated with thyroid dysfunction, they do not typically indicate an acute exacerbation or crisis situation like a significant increase in heart rate does. Monitoring for cardiovascular symptoms is crucial in managing patients with hyperthyroidism, and a rapid heart rate signifies the need for urgent evaluation and potential intervention.