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

Immediate first aid for thermal burns focuses on stopping the burning process and limiting tissue damage. This scenario requires applying knowledge of cooling mechanisms to dissipate heat from deep tissue layers without causing further vasoconstriction or injury.

Choice A rationale

Cool tap water helps dissipate heat from the skin and prevents the burn from progressing to deeper layers. Applying cool water for twenty minutes reduces edema and provides immediate pain relief without causing thermal shock.

Choice B rationale

Ice packs should never be applied directly to a burn. Extreme cold causes profound vasoconstriction, which impairs local blood flow to the injured area and can lead to frostbite or further tissue necrosis and ischemia.

Choice C rationale

While medical evaluation is necessary for serious burns, immediate cooling is the priority to stop tissue destruction. Delaying first aid to travel to a doctor without cooling the hand first allows the heat to continue.

Choice D rationale

Ointments or butter can trap heat within the skin and increase the risk of infection. Professional assessment should occur before applying topical agents, as they can interfere with the initial cleaning and debridement of the wound.

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.