Predicting post-trauma stress symptoms from pre-trauma psychophysiologic reactivity, personality traits and measures of psychopathology

Biology of Mood & Anxiety Disorders

Scott P Orr²  Natasha B Lasko²  Michael L Macklin²  Suzanne L Pineles¹  Yuchiao Chang⁴  Roger K Pitman³ 

[1] Department of Psychiatry, Boston University School of Medicine, Boston, MA, USA

[2] Department of Veterans Affairs Medical Center, Manchester, NH, USA

[3] Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA

[4] General Medicine Division, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA

关键词: Risk factors;    Psychophysiology;    Imagery;    Startle;    Conditioning;    Stress disorders, Post-traumatic;   

Others  :  794347
DOI  :  10.1186/2045-5380-2-8

 received in 2011-03-17, accepted in 2012-05-18,  发布年份 2012

【 摘 要 】

Background

Most individuals exposed to a traumatic event do not develop post-traumatic stress disorder (PTSD), although many individuals may experience sub-clinical levels of post-traumatic stress symptoms (PTSS). There are notable individual differences in the presence and severity of PTSS among individuals who report seemingly comparable traumatic events. Individual differences in PTSS following exposure to traumatic events could be influenced by pre-trauma vulnerabilities for developing PTSS/PTSD.

Methods

Pre-trauma psychological, psychophysiological and personality variables were prospectively assessed for their predictive relationships with post-traumatic stress symptoms (PTSS). Police and firefighter trainees were tested at the start of their professional training (i.e., pre-trauma; n = 211) and again several months after exposure to a potentially traumatic event (i.e., post-trauma, n = 99). Pre-trauma assessments included diagnostic interviews, psychological and personality measures and two psychophysiological assessment procedures. The psychophysiological assessments measured psychophysiologic reactivity to loud tones and the acquisition and extinction of a conditioned fear response. Post-trauma assessment included a measure of psychophysiologic reactivity during recollection of the traumatic event using a script-driven imagery task.

Results

Logistic stepwise regression identified the combination of lower IQ, higher depression score and poorer extinction of forehead (corrugator) electromyogram responses as pre-trauma predictors of higher PTSS. The combination of lower IQ and increased skin conductance (SC) reactivity to loud tones were identified as pre-trauma predictors of higher post-trauma psychophysiologic reactivity during recollection of the traumatic event. A univariate relationship was also observed between pre-trauma heart rate (HR) reactivity to fear cues during conditioning and post-trauma psychophysiologic reactivity.

Conclusion

The current study contributes to a very limited literature reporting results from truly prospective examinations of pre-trauma physiologic, psychologic, and demographic predictors of PTSS. Findings that combinations of lower estimated IQ, greater depression symptoms, a larger differential corrugator EMG response during extinction and larger SC responses to loud tones significantly predicted higher PTSS suggests that the process(es) underlying these traits contribute to the pathogenesis of subjective and physiological PTSS. Due to the low levels of PTSS severity and relatively restricted ranges of outcome scores due to the healthy nature of the participants, results may underestimate actual predictive relationships.

【 授权许可】

   
2012 Orr et al.; licensee BioMed Central Ltd.

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