A client is admitted to the hospital for treatment of a simple goiter, and levothyroxine sodium is prescribed. Which symptoms indicate to the nurse that the prescribed dosage is too high for this client?
A.
Palpitations and shortness of breath.
B.
Bradycardia and constipation.
C.
Muscle cramping and dry, flushed skin.
D.
Lethargy and lack of appetite.
The Correct answer and Explanation is:
The correct answer is A. Palpitations and shortness of breath.
Levothyroxine sodium is a synthetic form of the thyroid hormone thyroxine (T4) used to treat hypothyroidism and conditions such as goiter. Its goal is to restore normal levels of thyroid hormones in the body. However, if the dosage is too high, it can lead to symptoms of hyperthyroidism due to an excess of thyroid hormones.
Explanation
Palpitations and Shortness of Breath: These symptoms are classic signs of hyperthyroidism. When a patient receives too much levothyroxine, their metabolism increases excessively. This can lead to an overstimulation of the heart, resulting in palpitations (an abnormal awareness of the heartbeat) and potentially shortness of breath due to increased cardiac output or anxiety related to the rapid heart rate. High doses of levothyroxine can also precipitate arrhythmias, particularly in individuals with underlying heart conditions, making this symptom especially significant.
Bradycardia and Constipation: These symptoms (Option B) are more indicative of hypothyroidism rather than hyperthyroidism. Bradycardia refers to a slower-than-normal heart rate, which is contrary to what one would expect from excessive thyroid hormone. Constipation is also a common symptom of low thyroid hormone levels.
Muscle Cramping and Dry, Flushed Skin: These symptoms (Option C) could be associated with various conditions, but they do not directly indicate an excess of thyroid hormone. Muscle cramping may occur in various electrolyte imbalances, while dry, flushed skin is often seen in hypothyroid states.
Lethargy and Lack of Appetite: These symptoms (Option D) suggest hypothyroidism as well. When too much levothyroxine is administered, patients typically experience heightened energy levels rather than lethargy.
In summary, palpitations and shortness of breath (Option A) are clear indicators that the dosage of levothyroxine is too high, reflecting hyperthyroid symptoms and requiring prompt reassessment of the treatment regimen. Regular monitoring of thyroid hormone levels and clinical symptoms is essential to adjust the dosage effectively.