Which electrolyte imbalance is most likely indicated by a peaked T wave on an ECG?

Rationale:
A. Pain assessment is important but not the immediate priority following an EGD. Discomfort is expected after the procedure, yet it does not pose the greatest risk to airway safety.

B. Nausea should be monitored, especially since sedation and irritation of the upper GI tract can cause vomiting, but this is not the most critical concern immediately after the procedure.

C. The gag reflex must be assessed first because topical anesthetics used during the EGD suppress the swallowing and protective airway reflexes. If oral fluids or food are given before the gag reflex returns, the client is at high risk for aspiration, which can lead to pneumonia or airway obstruction. Ensuring the gag reflex has returned is the priority safety measure before advancing the diet or giving oral medications.

D. Level of consciousness should also be assessed, since sedatives are commonly used during the procedure. However, the risk of aspiration from an absent gag reflex presents a more immediate threat to life and therefore takes priority.

Rationale:

A. Seizures are more commonly associated with severe electrolyte imbalances like hyponatremia, not mild hypokalemia.

B. Neurogenic shock is related to spinal cord injury, not potassium imbalance.

C. Hypokalemia (potassium 3.3 mEq/L; normal 3.5–5.0 mEq/L) increases the risk of ventricular arrhythmias, palpitations, and potentially life-threatening cardiac complications, especially in clients taking diuretics like furosemide.

D. Low potassium does not directly cause hypoglycemia.