Botulinum Toxin A for Spastic Trismus Due to Brain Stem Encephalitis in a Pediatric Intensive Care Setting: A Unique Case Report.

Injection of botulinum toxin A to masseter and temporalis muscles improved mouth opening and facilitated suction and oral care in a child with spastic trismus. This is the first such report in a 3.5-year-old child on mechanical ventilator in pediatric intensive care unit setting.