This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuromuscular Blocker, Subject name: Anaesthesia
Most common arrhythmia associated with succinylcholine:- 
Select and explain. 
A. Ventricular tachycardia, B. Sinus bradycardia, C. Torsado de pointes, D. Paroxysmal atrial tachycardia
B: Sinus bradycardia
Answer: B: Sinus bradycardia 
Explanation: Sinus bradycardia is most common arrhythmia associated with succinylcholine. Succinylcholine is dicholine ester i.e. two molecules of acetylcholine. If it reaches cardiac muscarinic receptor then it can cause bradycardia and arrythmias. In contrast to actions at cardiac muscarinic cholinergic receptors the effect of succinylcholine at autonomic nervous system causes tachycardia and hypeension