A 22-year-old female with no significant past medical or sur…
A 22-year-old female with no significant past medical or surgical history is admitted to the intensive care unit (ICU) with worsening respiratory failure. She was being treated on the floor for pneumonia and is receiving noninvasive ventilation. On admission to ICU, she is found to be tachypneic with increasing work of breathing, and her mentation is altered. On airway examination, both thyromental distance and mouth opening are more than 3 fingerbreadth and her Mallampati score is 2. You decide to institute invasive mechanical ventilation. Once equipment and personnel are ready, propofol and succinylcholine are administered to facilitate endotracheal intubation. After 90 seconds, direct laryngoscopy is attempted, but you have difficulty opening her mouth and note marked masseter muscle rigidity. Which among the following conditions is known to be associated with this presentation?