A nurse is caring for a client who has valvular heart disease and is at risk for developing left-sided heart failure. Which of the following manifestations should alert the nurse that the client is developing this condition?

Choice A Reason: This is incorrect. Sinus bradycardia is a slow and regular heart rate that originates from the sinus node. It does not cause irregular palpitations, fatigue, or dizziness, unless the heart rate is very low or the client has underlying cardiac disease.

Choice B reason: This is incorrect. Sinus tachycardia is a fast and regular heart rate that originates from the sinus node. It may cause fatigue or dizziness, but not irregular palpitations or pulse deficit.

Choice C Reason: This is correct. Atrial fibrillation is a fast and irregular heart rate that originates from multiple foci in the atria. It causes irregular palpitations, fatigue, dizziness, and pulse deficit due to ineffective atrial contractions and variable ventricular response.

Choice D Reason: This is incorrect. First-degree AV block is a delay in the conduction of impulses from the atria to the ventricles. It does not affect the heart rate or rhythm, and does not cause any symptoms.

Choice A: Fatigue is a manifestation that the nurse should identify as indicating the client is hypokalemic. Hypokalemia is a condition in which the blood potassium level is lower than normal, usually due to excessive loss of potassium through urine, sweat, or vomiting. Potassium is an electrolyte that is essential for nerve and muscle function, especially for the heart. Hypokalemia can cause muscle weakness, cramps, and fatigue, as well as cardiac arrhythmias and dysrhythmias.

Choice B: Dyspnea is not a manifestation that the nurse should identify as indicating the client is hypokalemic. Dyspnea is a sensation of difficulty breathing or shortness of breath. Dyspnea can be caused by various conditions, such as asthma, chronic obstructive pulmonary disease (COPD), pneumonia, or pulmonary edema. Dyspnea is not directly related to hypokalemia, but it can be a sign of heart failure, which can cause fluid accumulation in the lungs and impair gas exchange.

Choice C: Oliguria is not a manifestation that the nurse should identify as indicating the client is hypokalemic. Oliguria is a reduced urine output, usually less than 400 mL per day or 30 mL per hour. Oliguria can be caused by various conditions, such as dehydration, kidney failure, urinary tract obstruction, or shock. Oliguria is not directly related to hypokalemia, but it can be a sign of kidney damage or impairment, which can affect electrolyte balance and fluid volume.

Choice D: Pitting edema is not a manifestation that the nurse should identify as indicating the client is hypokalemic. Pitting edema is a swelling of the tissues that leaves an indentation when pressed with a finger. Pitting edema can be caused by various conditions, such as venous insufficiency, lymphedema, liver cirrhosis, or malnutrition. Pitting edema is not directly related to hypokalemia, but it can be a sign of heart failure, which can cause fluid retention and overload in the body.