Patient after an ischemic attack has
ventricular Tachycardia. Drug of choice is:
a) Amiodrone
b) Metoprolol
c) Lidocaine
d) Verapamil
Correct Answer: c
Explanation:
Lidocaine is classified as a class
Ib anti-arrhythmic drug. It is also used as a local anaesthetic. It
selectively blocks sodium channels in depolarized cardiac cells (e.g; ischemic
cardiac muscle). It is therefore considered as a first line drug in ventricular
tachycardia in acute MI or after cardiac surgery. It is given through the IV
route.
Adverse effects of Lidocaine:
- high concentrations may cause bradycardia, hypotension and even asystole
- in 10% of patients may induce ventricular arrhythmias
- GI upset with nausea and vomiting
- CNS: parasthesiae, twitching and generalized tonic-clonic seizures
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