A 75-year-old patient with signs of a leaking cerebral aneurysm has ECG changes including T-wave inversion, QT prolongation, and U waves. The appropriate action at this point would be to:

A 75-year-old patient with signs of a leaking cerebral aneurysm has ECG changes including T-wave inversion, QT prolongation, and U waves. The appropriate action at this point would be to:

• A. Begin infusion of nitroglycerin
• B. Check serum calcium and potassium
• C. Administer esmolol
• D. Place a pulmonary artery catheter

Answer: (B)

In this setting, the ECG changes point to reversible metabolic disturbances rather than focusing only on the brain bleed. T-wave inversion, QT prolongation, and especially U waves are classic clues for electrolyte abnormalities, with U waves strongly suggesting hypokalemia and QT prolongation also seen with hypocalcemia. In a patient with suspected aneurysmal rupture, these electrolyte issues can develop or worsen quickly and raise the risk of dangerous arrhythmias and hemodynamic instability. Checking serum calcium and potassium promptly identifies treatable deficiencies so you can correct them and reduce arrhythmia risk. Other maneuvers don’t address the immediate problem. Lowering blood pressure with nitroglycerin could compromise cerebral perfusion in a leaking aneurysm. Administering esmolol targets the sympathetic surge but does not fix electrolyte disturbances and could cause problems if electrolytes are deranged. A pulmonary artery catheter is invasive and not necessary before confirming and correcting electrolyte abnormalities.

In this setting, the ECG changes point to reversible metabolic disturbances rather than focusing only on the brain bleed. T-wave inversion, QT prolongation, and especially U waves are classic clues for electrolyte abnormalities, with U waves strongly suggesting hypokalemia and QT prolongation also seen with hypocalcemia. In a patient with suspected aneurysmal rupture, these electrolyte issues can develop or worsen quickly and raise the risk of dangerous arrhythmias and hemodynamic instability. Checking serum calcium and potassium promptly identifies treatable deficiencies so you can correct them and reduce arrhythmia risk.

Other maneuvers don’t address the immediate problem. Lowering blood pressure with nitroglycerin could compromise cerebral perfusion in a leaking aneurysm. Administering esmolol targets the sympathetic surge but does not fix electrolyte disturbances and could cause problems if electrolytes are deranged. A pulmonary artery catheter is invasive and not necessary before confirming and correcting electrolyte abnormalities.