This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Complications Of Anaesthesia, Subject name: Anaesthesia
Hyperkalemia is caused by: (D. REPEAT 2010) 
Select and explain. 
A. N20, B. Atracurium, C. Succinyl choline, D. Pancuronium
C: Succinyl choline
Answer: C: Succinyl choline 
Explanation: Ref: A jay Yadav, Short Textbook of Anaesthesia, Page 86 and Miller Textbook of Anaesthesia, 6th editionExplanation:SYSTEMIC EFFECTS OF SUCCINYL CHOLINECardiovascular system - Profound bradycardia.Hyperkalemia - Due to excessive muscle fasciculations.CNS - Increases intracranial tension.Eye - Increases intraocular tension.GIT - Increases intragastric pressure, increases salivation, gastric secretions and peristalsis.Muscle pains - Due to excessive muscle contractions.Malignant hyperthermia-SCh is the most common drug causing this.Anaphylaxis.Masseter spasm.