Which of the following symptoms is associated with malignant hyperthermia?

Malignant hyperthermia is a rare, life-threatening condition that is often triggered by certain anesthetic agents and intense physical exertion. One characteristic symptom of malignant hyperthermia is the presence of masseter spasm, also known as trismus. This involuntary contraction of the jaw muscles is often one of the first indicators observed during an episode, making it significant in diagnosing this condition. The tightness and stiffness in the jaw can signal the onset of a broader systemic response that includes increased muscle metabolism and elevated body temperature.

Other symptoms of malignant hyperthermia include elevated carbon dioxide levels, acidosis, and muscle rigidity, but masseter spasm stands out due to its immediacy and specificity, making it a critical sign for clinicians. Recognizing this symptom is vital for timely intervention, which can mitigate the severe consequences associated with this hypermetabolic state.

Awareness of masseter spasm as a symptom helps healthcare professionals identify malignant hyperthermia more quickly, allowing for the necessary treatment to be administered before complications arise.