Canadian Practical Nurse Registration Examination (CPNRE) Practice Exam

Mrs. Hawkins is receiving potassium supplements while taking Lasix because Lasix, a loop diuretic, can lead to an increased excretion of potassium through urine. This loss occurs because loop diuretics work by inhibiting sodium and chloride reabsorption in the kidneys, which inadvertently results in the loss of potassium as well. Potassium is an essential electrolyte that plays a critical role in various physiological processes, including muscle function, nerve function, and maintaining fluid balance.

When patients are prescribed Lasix, monitoring potassium levels becomes essential. If potassium levels drop too low due to the effects of the diuretic, it can lead to hypokalemia, which can cause serious health issues such as arrhythmias, muscle weakness, and increased risk of digoxin toxicity if the patient is also on digoxin for heart issues. Therefore, potassium supplementation is necessary to replenish the lost potassium and maintain normal physiological functions.