Correct (2): Succinylcholine causes potassium efflux from muscle. In conditions with upregulated extra-junctional acetylcholine receptors — major burns >24 hours, spinal cord injury >72 hours, prolonged immobility, denervation injuries, muscular dystrophy, rhabdomyolysis — hyperkalemia surge can cause cardiac arrest. Use a non-depolarizing NMBA (rocuronium) instead. (1,3,4) Not contraindications.
For study reference only. Always follow current clinical guidelines and your institution’s protocols.