In most cases, no signs or symptoms of susceptibility to malignant hyperthermia exist until you're exposed to certain drugs used for anesthesia. Signs and symptoms of malignant hyperthermia may vary and can occur during anesthesia or during recovery shortly after surgery. They can include:  Severe muscle rigidity or spasms Rapid, shallow breathing and problems with low oxygen and high carbon dioxide Rapid heart rate Irregular heart rhythm Dangerously high body temperature Excessive sweating Patchy, irregular skin color (mottled skin)  In rare cases, people at risk of malignant hyperthermia have shown signs of a reaction after intense physical activity during excessive heat or humidity, during a viral illness, or when taking statin medication used to lower cholesterol. If you're at risk of malignant hyperthermia and you don't have a serious reaction during your first exposure to certain anesthesia drugs, you're still at risk if you receive these drugs in the future. Other anesthesia drugs that don't trigger a reaction can be used instead.
cases  signs symptoms susceptibility malignant hyperthermia exist you're exposed drugs anesthesia  signs symptoms malignant hyperthermia may vary can occur anesthesia recovery shortly surgery  can include:  severe muscle rigidity spasms rapid  shallow breathing problems low oxygen high carbon dioxide rapid heart rate irregular heart rhythm dangerously high body temperature excessive sweating patchy  irregular skin color (mottled skin)  rare cases  people risk malignant hyperthermia shown signs reaction intense physical activity excessive heat humidity  viral illness  taking statin medication lower cholesterol  you're risk malignant hyperthermia don't reaction first exposure anesthesia drugs  you're still risk receive drugs future  anesthesia drugs don't trigger reaction can instead
malignant hyperthermia