propofol-induced masseter muscle spasm in a woman with a major depressive disorder

Masseter muscle rigidity is a known complication of drugs such as succinylcholine and volatile agents. however, muscle rigidity is an uncommon complication of propofol. we report the case of a 56yearold asaps class i woman refereeing for colonoscopy due to chronic constipation under deep intravenous sedation. she suffered masseter spasm after the injection of propofol. masseter spasm should not be considered limited to special drug groups. in any case of difficult mouth opening, masseter spasm should be kept in mind and deepening of anesthesia or complete blockade of neuromuscular junction should be considered by the use of nondepolarizing muscle relaxants.