Which are the causes of Malignant hyperthermia?

The cause starts with genetics mixing with anesthesia. The combination can become lethal. It started with the drug called succinylcholine that was given to patients to sleep for surgery. In the early years many died because they didn't know it was allergic reaction to the drug that was killing people. I was one of the lucky few that was pronounced dead by a husband Dr. Shaw. And awhile later after a heart attack and increased temperature issues, and stiffness of the body, along with plus issues. The wife Dr Shaw came in and pronounced me alive. She was learning about this in another country and saved me. It was very rare to live still in the seventies then. I went in for tonsils and never got them out. It was 5 (1981) more years before they did the MH test on me with the biopsy,6 (1982) for my tonsils finally.