Psychiatry Investig.  2013 Jun;10(2):121-130.

Decreased Cardiac Vagal Control in Drug-Naive Patients with Posttraumatic Stress Disorder

Affiliations
  • 1Department of Psychiatry, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan. chang.ha@msa.hinet.net
  • 2Student Counseling Center, National Defense Medical Center, Taipei, Taiwan.
  • 3Institute of Brain Science, National Yang-Ming University, Taipei, Taiwan.
  • 4Institute of Behavioral Medicine and Department of Psychiatry, College of Medicine, National Cheng Kung University, Tainan, Taiwan.

Abstract


OBJECTIVE
Decreased cardiac vagal control (CVC) has been proposed in posttraumatic stress disorder (PTSD), but the results are mixed. Analyses with larger sample sizes and better methodology are needed.
METHODS
Thirty-two drug-naive survivors with current PTSD, 32 survivors without PTSD and 192 matched controls were recruited for a case-control analysis. We used the PTSD checklist-civilian version (PCL-C) to assess posttraumatic symptoms severity. Cardiac autonomic function was evaluated by measuring heart rate variability (HRV) parameters. Frequency-domain indices of HRV were obtained. The obtained results were evaluated in association with personality traits assessed by the Tridimensional Personality Questionnaire (TPQ).
RESULTS
PTSD patients exhibited decreased LF-HRV and HF-HRV as compared to survivors without PTSD and to matched controls. The PTSD symptoms severity was associated with reduced mean RR intervals, Var-HRV, LF-HRV and HF-HRV. The harm avoidance score (which has been suggested to be associated with serotonergic activity) was negatively correlated with Var-HRV, LF-HRV and HF-HRV.
CONCLUSION
These data suggest that PTSD is accompanied by decreased CVC, highlighting the importance of assessing HRV in PTSD patients. In view of the increased risk for cardiovascular diseases in these vulnerable individuals, one might consider the treatment to restore their autonomic function while reducing PTSD symptoms.

Keyword

Posttraumatic stress disorder; Heart rate variability; Cardiac autonomic function; Vagal control

MeSH Terms

Cardiovascular Diseases
Case-Control Studies
Heart Rate
Humans
Surveys and Questionnaires
Sample Size
Stress Disorders, Post-Traumatic
Survivors
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