During continuous ECG monitoring following subarachnoid hemorrhage, transient deep T-wave inversions are most accurately explained by which underlying mechanism?
Sympathetic overdrive causing myocardial repolarization injury
Subarachnoid haemorrhage produces a massive catecholamine surge that overstimulates the myocardium, causing sympathetic-overdrive-mediated repolarisation injury. On the ECG this appears as deep, often widespread T-wave inversions (so-called 'cerebral T waves'), QT prolongation and occasionally stress (Takotsubo) cardiomyopathy.
Primary coronary ischaemia, intrinsic conduction-system degeneration and direct electrolyte loss are not the main mechanisms behind the transient T-wave changes typical of SAH.
Hence, Sympathetic overdrive causing myocardial repolarization injury.
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Important Questions from Introduction to Cardiovascular Diseases
Which ECG change is most commonly associated with myocardial ischemia?
A patient presents with chest pain and ST elevation in leads II, III, and aVF. According to the universal definition of MI, which coronary artery is most likely involved, and what is the ECG diagnosis?
Which ECG change is most characteristic of an acute myocardial infarction?
Which segment is primarily analyzed to diagnose an ST-elevation myocardial infarction (STEMI)?
What is a typical ECG finding in patients with cerebral infarct?
