Physiologic responses to non-startling tones in Vietnam veterans with post-traumatic stress disorder.

Full Abstract

We evaluated eyeblink and autonomic reactivity to non-startling acoustic stimuli in a convenience sample of Vietnam combat veterans. Twenty veterans with current PTSD and 19 veterans who never had PTSD were exposed to 15 consecutive 86-dB, 500-ms, 100-Hz tones with 40-ms rise and fall times, while orbicularis oculi electromyogram (EMG), skin conductance (SC) and heart rate (HR) responses were measured. PTSD subjects had higher resting HR levels and produced larger averaged HR responses across the 15 tone presentations compared to non-PTSD subjects. Skin conductance and EMG responses did not differ between the groups. Results suggest that previous findings of larger HR responses to loud tones in PTSD extend to lower intensity, non-startling stimuli, but that the magnitude of the HR response appears smaller to the lower intensity stimuli. Previously observed differences in the magnitude of the eyeblink response and rate of decline of SC responses in PTSD to high intensity stimuli appear to disappear when using non-startling stimuli.

Author information

Author/s: Orr, S P (SP); Lasko, N B (NB); Metzger, L J (LJ); Pitman, R K (RK);

Affiliation: Veterans Affairs Medical Center, Manchester, NH 03103, USA.

Journal and publication information

Publication Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.

Journal: Psychiatry research (Psychiatry Res), published in IRELAND. (Language: eng)

Reference: 1997-Nov; vol 73 (issue 1-2) : pp 103-7

Dates: Created 1998/05/11; Completed 1998/05/11; Revised 2008/04/17;

PMID: 9463843, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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