The nurse suspects that a client with pancreatitis has developed hypocalcemia. Which electrocardiogram finding supports the nurse's suspicion?

Pancreatitis often leads to electrolyte imbalances, specifically hypocalcemia due to fat necrosis and soap formation. Knowledge of cardiac electrophysiology is required to recognize how low calcium levels (normal 8.5 to 10.5 mg/dL) affect the myocardial action potential. Choice A rationale Prolonged QT interval is a classic electrocardiogram finding in hypocalcemia. Low serum calcium slows the movement of calcium into the cardiac cells during the plateau phase, thereby lengthening the duration of ventricular depolarization and repolarization cycles. Choice B rationale A shortened PR interval is not associated with hypocalcemia. PR interval changes are more frequently linked to pre-excitation syndromes or inflammatory conditions of the heart, rather than the specific electrolyte shifts seen in acute pancreatic inflammation. Choice C rationale Peaked T waves are a hallmark sign of hyperkalemia, not hypocalcemia. In hypocalcemia, the T wave may actually appear flattened or inverted, but the most distinctive and supportive finding remains the elongation of the QT interval. Choice D rationale Elevated ST segments are typically indicative of myocardial infarction or pericarditis. While electrolyte imbalances can cause various cardiac changes, ST elevation is not the primary diagnostic indicator used to support a suspicion of clinical hypocalcemia.