title: Syncope as the first sign of complete heart block in a military aviator.
abstract: BACKGROUND
  Syncope in an aviator may lead to abrupt loss or impairment of control of an aircraft and is thus a threat to safety of flight. Consequently, it is vital to conduct a thorough medical evaluation of any syncopal episode in a pilot or other flight crewmember.
  
  
  METHODS
  A 28-yr-old male Naval Flight Officer experienced loss of consciousness at a morning briefing, but immediately returned to normal except for tachycardia. He suffered a second episode at a base hospital while on a cardiac monitor. The rhythm was diagnosed as complete heart block and a permanent pacemaker was inserted. This condition is considered disqualifying for U.S. Navy aviation duty.
  
  
  CONCLUSIONS
  It is easy to dismiss a single episode of syncope in this age group as due to orthostasis, hangover, or other benign causes. Serious underlying pathology such as complete heart block is rare. The threat to safety of flight, however, dictates that all episodes of syncope in aviators receive a thorough diagnostic work-up.
authors.affiliation: Electronic Attack Squadron 142 and the Naval Hospital Oak Harbor, Oak Harbor, WA, USA. ryan.gould@med.navy.mil
authors.forename: Ryan K
authors.initials: RK
authors.lastname: Gould
mesh_terms: D000328:Adult; D000337:Aerospace Medicine; D000401:Aircraft; D006327:Heart Block / Q000150:complications / Q000175:diagnosis* / Q000628:therapy; D006801:Humans; D008297:Male; D008889:Military Personnel; D009326:Naval Medicine; D010138:Pacemaker, Artificial; D013575:Syncope / Q000175:diagnosis* / Q000209:etiology; D014481:United States