Organophosphate intoxication-related coital-like involuntary movements: Report of a case

The neurologic manifestations of organophosphate intoxication are many, and different pathophysiologic mechanisms are responsible for the different presentations occurring at different stages of the disease process. Movement disorders constitute one of the neurologic manifestations, which may include Parkinsonism or other dyskinetic movements. However, involuntary coital-like movements have not been reported as one of the organophosphate intoxication-related movement disorders. In this case report, we describe a 71-year-old man who developed involuntary coital-like movements about one and a half months after an event of organophosphate intoxication in an attempt to commit suicide. The involuntary movements were to-and-fro pelvic thrusting and back-rocking movements. The patient was able to suppress the involuntary movements for a short period of time, although they usually persisted all day long. The involuntary movements occurred in all postures including standing, sitting and in supine postures, resulting in great embarrassment. These involuntary movements also interfered with the initiation of sleep, although they discontinued while asleep. With clonazepam and piracetam therapy, the involuntary coital-like movements of this patient decreased in amplitude, although remaining to a degree even after one year of follow-up.