A nurse is monitoring a client following a hemodialysis treatment through an arteriovenous (AV) fistula. Which of the following findings should the nurse report to the provider?

Choice A reason: The correct answer is a because hyperkalemia, or high serum potassium levels, often leads to peaked T waves on an ECG. A reduction of T wave amplitude indicates that potassium levels are decreasing and the medication is effective.

Choice B reason: P wave duration is not typically affected by hyperkalemia. Changes in the P wave are more commonly associated with atrial abnormalities, not electrolyte imbalances.

Choice C reason: Widening of the QRS complex is a sign of severe hyperkalemia and indicates worsening of the condition. The goal of treatment is to prevent such changes, not to observe them as an indication of effectiveness.

Choice D reason: Restoration of QRS complex amplitude is not a specific indicator of hyperkalemia or its treatment. The focus should be on changes in the T wave and other signs of electrolyte normalization.

Choice A reason: Brudzinski's sign is an indicator of meningitis, where flexion of the neck causes involuntary flexion of the hips and knees. This sign is not related to hypocalcemia and is more specific to central nervous system infections.

Choice B reason: Chvostek's sign is a clinical sign of hypocalcemia. It is elicited by tapping on the facial nerve in front of the ear, which causes twitching of the facial muscles. This sign indicates neuromuscular irritability due to low calcium levels and is a key indicator for diagnosing hypocalcemia.

Choice C reason: Cullen's sign is a superficial edema and bruising in the subcutaneous fatty tissue around the umbilicus. It is associated with acute pancreatitis and intra-abdominal bleeding, not hypocalcemia. Therefore, it is not an appropriate sign to monitor for in clients with hypocalcemia.

Choice D reason: Kernig's sign is another indicator of meningitis. It involves pain and resistance to knee extension when the hip is flexed. Like Brudzinski's sign, it is specific to meningitis and is not related to hypocalcemia. Monitoring for this sign would not be relevant for a client with low calcium levels.