<prompt> Hyperkalemia is caused by:N2OAtracuriumSuccinyl cholinePancuronium  <response>: Refer: Millers, Clinical Anaesthesia, 7th edition, pg no: 2373-2383Systemic effects of Succinyl cholineCardiovascular system - Profound bradycardiaHyperkalemia - 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 drugcausing this.Anaphylaxis.Masseter spasm. 