title: Relation between perceived blood loss and vasovagal symptoms in blood donors.
abstract: INTRODUCTION/RESULTS:                          This study examined whether a belief of significant blood loss may be associated with vasovagal symptoms, irrespective of actual blood loss. Individual differences in vasovagal symptoms among blood donors who had an equivalent amount of blood withdrawn were significantly associated with their rating of perceived blood loss.
  
  
  CONCLUSIONS
  The anticipation or belief of blood loss, and perhaps more remotely associated ideas, may trigger processes similar to those induced by actual hemorrhage though further research is required to address other possibilities such as the inflation of ratings by vasovagal symptoms.
authors: Laboratory for Cardiovascular Psychophysiology, Department of Psychology, McGill University, 1205 Dr Penfield Ave, Montreal, QC, H3A 1B1, Canada. blaine.ditto@mcgill.ca
authors: Blaine
authors: B
authors: Ditto
authors: Saharnaz
authors: S
authors: Balegh
authors: Philippe T
authors: PT
authors: Gilchrist
authors: Crystal D
authors: CD
authors: Holly
mesh_terms: D001782:Blood Donors / Q000523:psychology*; D005260:Female; D006470:Hemorrhage / Q000150:complications / Q000523:psychology*; D006801:Humans; D008297:Male; D018962:Phlebotomy / Q000009:adverse effects* / Q000523:psychology; D011446:Prospective Studies; D011602:Psychophysiologic Disorders / Q000209:etiology / Q000523:psychology*; D019462:Syncope, Vasovagal / Q000209:etiology / Q000523:psychology*; D055815:Young Adult