PTSD in veterans tied to worse heart health

By Scott Maier  |  Originally published on UCSF News
 

EKG showing a heart design
Post-traumatic stress disorder (PTSD) in veterans is associated with worse vascular function, which can increase their risk for cardiovascular disease (CVD) and death, according to researchers at UC San Francisco (UCSF) and the affiliated San Francisco VA Health Care System (SFVAHCS).

The study, which appears in the March 2016 issue of the Journal of the American Heart Association, found that veterans with PTSD were more likely to have worse endothelial vascular function, which controls the flow of nutrients and toxins from the blood stream to the brain and body, and plays a key role in blood vessel dilation, blood pressure, clotting and inflammation.

“If other studies confirm that patients with PTSD have worse endothelial function, this could be an important target in our efforts to prevent CVD and improve the health of veterans with PTSD,” said senior author Beth Cohen, MD, associate professor of medicine at UCSF Health and SFVAHCS.
 

PTSD linked to diminished endothelial function, greater likelihood of depression

An estimated 7.7 million Americans suffer from PTSD. Many veterans returning from tours are affected by PTSD and, over time, the effects may be physical as well as mental.

It is believed that the cumulative effects of stress negatively impact the nervous, cardiovascular, metabolic and immune systems. Previous studies have indicated that psychosocial factors such as PTSD result in increased risk for cardiovascular disease and mortality over other risk factors such as diabetes, hypertension, and obesity. Despite this association, the underlying mechanisms are not well understood.

For their study, Cohen and her research team recruited 214 outpatients at the SFVAHCS between June 2011 and August 2015 for CVD testing. The tests involved flow-mediated brachial artery vasodilation (FMD) – the gold standard measurement of endothelial function – and an established symptom checklist for diagnosis of PTSD. Endothelial dysfunction is a potential mechanism in the development and progression of cardiovascular disease.

Overall, 31 percent (64) of the 214 patients were found to have PTSD. These patients also were more likely to suffer from depression and had worse endothelial function, as measured by a significantly lower FMD.

Adjusting for demographic, comorbidity and treatment characteristics, PTSD was associated with worse endothelial function. Possible reasons include impairment of pathways for nitric oxide, a key mediator; lower peripheral cortisol levels that can result in endothelial cell inflammation; or the release of vessel constricting agents.

“To our knowledge, this represents the largest cohort measuring endothelial function with flow-mediated vasodilation in patients with PTSD,” said lead author Marlene Grenon, MDCM, associate professor of surgery at UCSF Health and SFVAHCS and investigator in the Vascular Integrated Physiology and Experimental Therapeutics (VIPERx) lab in San Francisco. “The data provide evidence of a clear association between PTSD and vascular function among veterans and illustrate the need to determine the optimal multidisciplinary strategies to treat patients with comorbid PTSD and CVD risk.”

The researchers note that more study in a broader population group is needed to determine whether poor endothelial function contributes to excess risk of CVD in these patients.

Co-authors on the paper included Christopher Owens, MD; Hugh Alley; Sandra Perez; and Warren Gasper, MD, all of UCSF, the SFVAHCS and VIPERx. Additional authors included UCSF Psychiatry faculty researchers Thomas Neylan, MD, and Kirstin Aschbacher, PhD; as well as Mary Whooley, MD, and Joan Hilton, MD, of UCSF.

Funding was provided by start-up funds from UCSF and the Northern California Institute for Research and Education; National Center for Research Resources award KL2RR024130; National Institutes of Health/National Heart, Lung, and Blood Institute awards 1K23HL122446-01 and K23 HL 094765-01; a Society for Vascular Surgery Seed Grant and Career Development Award; U.S. Department of Defense; American Heart Association; Brain and Behavior Research Foundation; and the Irene Perstein Foundation.

About UCSF Psychiatry

The UCSF Department of Psychiatry and the Langley Porter Psychiatric Institute are among the nation's foremost resources in the fields of child, adolescent, adult and geriatric mental health. Together they constitute one of the largest departments in the UCSF School of Medicine, with a mission focused on research (basic, translational, clinical), teaching, patient care, and public service. UCSF Psychiatry has an organizational structure that crosses all major UCSF sites - Parnassus, Mission Bay, Laurel Heights, Mt. Zion, Zuckerberg San Francisco General Hospital and Trauma Center, the San Francisco VA Health Care System, and UCSF Fresno.

About the San Francisco VA Health Care System

The San Francisco VA Health Care System is a comprehensive network that provides health services to veterans through the San Francisco VA Medical Center (SFVAMC) and six community-based outpatient clinics in Santa Rosa, Eureka, Ukiah, Clearlake, San Bruno, and downtown San Francisco. It has a long history of conducting cutting-edge research, establishing innovative medical programs, and providing compassionate care to veterans. SFVAMC has been affiliated with the UCSF School of Medicine for over 50 years, and all physicians are jointly recruited by SFVAMC and the UCSF School of Medicine.