A nurse in a provider's office is assessing a client who reports dyspnea and fatigue. Physical assessment reveals tachycardia and weak peripheral pulses. The nurse should recognize these findings as manifestations of which of the following conditions?

Hypokalemia is a low serum potassium level, usually below 3.5 mEq/L. It can be caused by diuretics that increase potassium excretion, such as thiazides or loop diuretics. Potassium is essential for normal muscle and nerve function, and hypokalemia can impair cardiac, skeletal, and smooth muscle activity. Symptoms of hypokalemia include fatigue, weakness, muscle cramps, arrhythmias, constipation, and hyporeflexia.

1. Dyspnea is difficulty or labored breathing that can be caused by various respiratory or cardiac conditions, such as asthma, pneumonia, pulmonary edema, or heart failure. It is not a specific sign of hypokalemia, although severe hypokalemia can affect respiratory muscle function and cause respiratory failure.
2. Oliguria is a reduced urine output, usually less than 400 mL per day or 30 mL per hour. It can be caused by various renal or fluid balance disorders, such as acute kidney injury, dehydration, or shock. It is not a specific sign of hypokalemia, although severe hypokalemia can impair renal function and cause renal failure.
3. Pitting edema is a swelling of the tissues that leaves an indentation when pressed with a finger. It can be caused by various fluid retention disorders, such as heart failure, liver cirrhosis, or nephrotic syndrome. It is not a specific sign of hypokalemia, although severe hypokalemia can affect fluid and electrolyte balance and cause edema.

A. Asthma typically presents with wheezing, shortness of breath, and chest tightness. While dyspnea is a symptom, tachycardia and weak peripheral pulses are not characteristic findings associated with asthma.
B. Aortic valve regurgitation may cause dyspnea and fatigue, but it is more commonly associated with bounding pulses and diastolic murmur rather than weak peripheral pulses.
C. Heart failure is characterized by symptoms such as dyspnea, fatigue, tachycardia, and weak peripheral pulses due to reduced cardiac output and poor perfusion to the extremities. The nurse should recognize these signs as indicative of heart failure.
D. Aortic stenosis can lead to symptoms like dyspnea and fatigue; however, it typically presents with a triad of symptoms including exertional dyspnea, angina, and syncope, rather than weak peripheral pulses.