title: Muscle spasms, twitches in arm upon throwing · Dx?
abstract: Involuntary upper right arm muscle contractions and spasms, which began intermittently when the patient was a teenager, were now a real problem for him as an adult. The patient was having difficulty rolling a baseball underhand to players as part of infield practice and he was experiencing muscle spasms when lifting his right arm over his head. "Twitches" in the patient's upper arm were making drinking difficult, but he had no problems feeding himself, writing, or performing other basic activities of daily living.
authors.affiliation: Department of Family and Preventive Medicine, University of Utah, Salt Lake City, USA. Email: kyle.jones@hsc.utah.edu.
authors.forename: Kyle Bradford
authors.initials: KB
authors.lastname: Jones
authors.affiliation: Department of Neurology, University of Utah, Salt Lake City, USA.
authors.forename: Juliann
authors.initials: J
authors.lastname: Allred
authors.affiliation: University of Utah, Salt Lake City, USA.|Banner Sun Health Research Institute, Sun City, AZ, USA.
authors.forename: David
authors.initials: D
authors.lastname: Shprecher
mesh_terms: D000328:Adult; D001484:Baseball; D004421:Dystonia / Q000175:diagnosis* / Q000188:drug therapy* / Q000503:physiopathology; D006801:Humans; D008297:Male; D009132:Muscles / Q000503:physiopathology*; D012782:Shoulder / Q000503:physiopathology*; D013035:Spasm / Q000175:diagnosis* / Q000188:drug therapy* / Q000503:physiopathology / Q000628:therapy*; D016896:Treatment Outcome