Pediatric Malignant Hyperthermia
Children who experience fulminant MH events may exhibit slightly different symptoms compared to adults. The most prevalent indicator is a rapid and irregular heart rate. In children, hyperthermia and hyperkalemia develop more quickly, and the levels of potassium in their blood can be higher than in adults. Approximately half of fulminant MH events in children under 12 years old present with muscle rigidity. Younger children are more prone to skin mottling, characterized by dark red and purple discoloration. On the other hand, children aged between 12 and 18 are three times more likely to experience masseter muscle rigidity, resulting in difficulty opening their mouths.
Incidence of Malignant Hyperthermia
According to surgeons, there is a suspicion of malignant hyperthermia in approximately 25% of procedures that involve general anesthesia. This suspicion arises from the observation of symptoms that could indicate malignant hyperthermia, although these symptoms may not progress to a full-blown MH event. On the other hand, a fulminant MH event is reported in approximately 200 out of every 250,000 procedures conducted under general anesthesia. However, it is important to note that these numbers are only rough estimates due to the possibility of doctors categorizing mild fulminant MH events as suspicions rather than confirmed cases.
Furthermore, studies indicate that variants of the RYR1 gene are present in approximately 1 in every 2,000 individuals. However, ongoing research suggests that the prevalence of RYR1 gene mutations may be higher than previously believed.