title: [Hemodynamics following + Gz stress in dog].
abstract: OBJECTIVE
  To investigate the character of hemodynamics following + Gz stress in dog.
  
  
  METHODS
  Nine anesthesia dogs were exposed to 5, 7 and 9 + Gz stress, 90 s at peak G. Each animal was instrumented to measure left ventricular pressure, thoracic aorta pressure, iliac arterial pressure,common carotid artery flow (CCAF) and ECG.
  
  
  RESULTS
  (1) Heart rate, CCAF and blood pressure at any place increased. They were greater than those before + Gz stress (P < 0.05). (2) There were much more arrhythmias following high + Gz stress. Most of arrhythmias were junctional premature beats, ventricular premature beats. 80% arrhythmias occurred within 3 min following + Gz stress. (3) Blood pressure appeared the highest in the second min following + Gz stress.
  
  
  CONCLUSIONS
  Great hemodynamic disturbance happened following high + Gz stress. There might were reperfusion arrhythmias. Protective measures should been noted following high + Gz stress.
authors.affiliation: Institute of Aviation Medicine, Air Force, Beijing 100036, China.
authors.forename: L J
authors.initials: LJ
authors.lastname: Shi
authors.forename: J L
authors.initials: JL
authors.lastname: Wu
authors.forename: G D
authors.initials: GD
authors.lastname: Li
authors.forename: C
authors.initials: C
authors.lastname: Tan
authors.forename: L
authors.initials: L
authors.lastname: Song
authors.forename: G D
authors.initials: GD
authors.lastname: Yan
mesh_terms: D000054:Acceleration / Q000009:adverse effects*; D000818:Animals; D001145:Arrhythmias, Cardiac / Q000503:physiopathology; D001794:Blood Pressure; D004285:Dogs; D005260:Female; D006339:Heart Rate; D006439:Hemodynamics; D008297:Male