During a home visit, a client informs the nurse about feeling like the heart is skipping beats. When reviewing the client's record, the nurse notes that the client is taking hydrochlorothiazide. Based on these assessment data, the nurse plans to obtain a blood sample to check for which condition?

A. Hypokalemia: Hydrochlorothiazide is a thiazide diuretic that can cause potassium loss through increased urine production. A common side effect of thiazide diuretics is hypokalemia, which can lead to symptoms such as palpitations or the sensation of the heart skipping beats. Therefore, it is crucial to check the client’s potassium levels to determine if hypokalemia is contributing to the client's symptoms. B. Hyponatremia: While thiazide diuretics can affect sodium levels, hypokalemia is more directly associated with the symptoms described. Hyponatremia (low sodium levels) might also occur but is less commonly linked to the symptom of a skipped heartbeat compared to hypokalemia. C. Hyperphosphatemia: Hydrochlorothiazide is not known to cause significant changes in phosphate levels, and hyperphosphatemia is not typically associated with the sensation of skipped heartbeats. D. Hypermagnesemia: This condition, which involves elevated magnesium levels, is not a common side effect of hydrochlorothiazide. Hypokalemia is a more relevant concern for the symptoms described.