Which of the following is most likely to trigger a premature ventricular contraction?
Electrolyte imbalance
Among the choices listed, electrolyte imbalance — especially hypokalaemia, hyperkalaemia, hypomagnesaemia or hypocalcaemia — is a well-known trigger for premature ventricular contractions by altering ventricular membrane excitability.
Increased vagal tone slows conduction and favours bradycardia, a slow heart rate without irritability does not provoke PVCs, and a normal conduction pathway is by definition the absence of a trigger.
Hence, Electrolyte imbalance.
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Important Questions from Basic Cardiovascular Investigations
Tall, peaked P waves on ECG are most commonly associated with:
What is the main purpose of the Einthoven triangle in electrophysiology?
What does the QT interval on a normal ECG primarily represent?
A patient presents with muscle weakness, and the ECG shows flattened T waves and prominent U waves. Which electrolyte imbalance is most probable?
Sinus bradycardia is associated with:
