This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
Succinylcholine is used with caution in all except – 
Select and explain. 
A. Mysthenia gravis, B. Burns, C. Crush injury, D. Tachycardia
D: Tachycardia
Answer: D: Tachycardia 
Explanation: Sch is the only muscle relaxant that causes vagal stimulation → Causes bradycardia. (attenuates tachycardia & hypertension).
In burns, crush injury and mysthenia gravis can cause severe hyperkalemia.