title: Right anterior cingulate cortical volume covaries with respiratory sinus arrhythmia magnitude in combat veterans.
abstract: Existing data suggest anterior cingulate cortex (ACC) plays a role in autonomic regulation. In persons with posttraumatic stress disorder (PTSD), autonomic regulation appears impaired and smaller mean ACC volume has been reported. This study examined relationships between ACC volume and the magnitude of respiratory sinus arrhythmia (RSA) in 77 U.S. combat veterans at rest, 40 of whom met criteria for PTSD. RSA magnitude did not differ in combat survivors with and without PTSD, which contradicts studies comparing civilians with PTSD to nontraumatized controls. RSA magnitude was positively correlated with right but not left hemisphere ACC volume. This finding was statistically independent of the presence or absence of PTSD.
authors.affiliation: Dissemination and Training Division, Department of Veterans Affairs (VA) Palo Alto Health Care System, Palo Alto, CA 94304, USA. steve.woodward@va.gov
authors.forename: Steven H
authors.initials: SH
authors.lastname: Woodward
authors.forename: Danny G
authors.initials: DG
authors.lastname: Kaloupek
authors.forename: Marie
authors.initials: M
authors.lastname: Schaer
authors.forename: Christelle
authors.initials: C
authors.lastname: Martinez
authors.forename: Stephan
authors.initials: S
authors.lastname: Eliez
mesh_terms: D000679:Amygdala / Q000033:anatomy & histology; D001146:Arrhythmia, Sinus / Q000503:physiopathology*; D001341:Autonomic Nervous System / Q000503:physiopathology*; D047830:Gulf War; D006179:Gyrus Cinguli / Q000033:anatomy & histology* / Q000503:physiopathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D014728:Veterans; D047829:Vietnam Conflict; D014857:Warfare