AHA Coding Clinic® for ICD-9 - 1998 Fourth Quarter; VOLUMES 1 & 2 NEW/REVISED CODES

Malignant Hyperthermia

Malignant hyperthermia is an autosomal-dominant inherited disorder. The incidence of genetic predisposition is 1:10000, the clinical incidence about 1:30000. Malignant hyperthermia is a life threatening, acute pharmacogenetic disorder which develops during or after a general anesthesia. Triggering agents include all volatile anesthetics (Chloroform, Ether, Halothane, Enflurane, Isuflurane, Sevoflurane, Deflurane) and depolarizing muscle relaxants. This disorder causes a sudden, rapid rise in body temperature associated with signs of increased muscle metabolism. Other signs and symptoms include tachycardia, arrhythmia, tachypnea, sweating, cyanosis and muscle rigidity. The reaction is rapidly progressive and often fatal. Treatment must be initiated immediately. Prior to October...

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