Succinylcholine is used with caution in all except
Mythenia gravis
Burns
Crush injury
Tachycardia
Sch is the only muscle relaxant that causes vagal stimulation and causes bradycardia (attenuates tachycardia and hypeension ) In burns, crush injury and myasthenia gravis can cause severe hyperkalemia. Ref: Morgan 4th/e p 214
Muscle relaxants