title: Autonomic dysreflexia and myocardial ischemia.
abstract: METHODS
  A case report of silent myocardial ischemia in a man with C5 AIS A (American Spinal Injury Association Impairment Scale) tetraplegia during an episode of autonomic dysreflexia (AD).
  
  
  OBJECTIVE
  The aim of this study was to show a clinical presentation of myocardial ischemia in individuals with spinal cord injury (SCI).
  
  
  METHODS
  A 45-year-old man with chronic C5 complete SCI presented with an episode of uncontrolled AD. He denied any symptoms of typical myocardial ischemia. Despite initiation of the AD management protocol, his blood pressure remained elevated. Additional testing revealed an unexpected horizontal ST depression in the lateral leads with a significant elevation of troponins. A follow-up cardiac angiography and MIBI cardiac perfusion scan revealed normal left ventricular contractility and no evidence of coronary artery occlusion.
  
  
  CONCLUSIONS
  In individuals with SCI, the loss of sensory input from the myocardium to supraspinal structures predisposes them to asymptomatic myocardial ischemia. Furthermore, during an episode of AD, a significant increase in visceral sympathetic activity with coronary artery constriction can result in myocardial ischemia, even in the absence of coronary artery disease.
authors.affiliation: International Collaboration on Repair Discoveries, University of British Columbia, Vancouver, British Columbia, Canada.
authors.forename: C P
authors.initials: CP
authors.lastname: Ho
authors.forename: A V
authors.initials: AV
authors.lastname: Krassioukov
mesh_terms: D020211:Autonomic Dysreflexia / Q000150:complications* / Q000175:diagnosis* / Q000628:therapy; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000175:diagnosis* / Q000209:etiology* / Q000628:therapy; D011782:Quadriplegia / Q000175:diagnosis / Q000209:etiology; D013119:Spinal Cord Injuries / Q000150:complications* / Q000175:diagnosis* / Q000628:therapy