Vagal control moderates the association between endothelial function and PTSD symptoms in women with T2DM

Posttraumatic stress disorder increases thrombosis risk: Evidence from a biobank data set

Depression and anxiety are linked to deep venous thrombosis (DVT) and posttraumatic disorder (PTSD) increases risk of venous thromboembolism in women. However, the mechanisms underlying this relationship remain unknown. We hypothesized that PTSD would associate with increased DVT risk, that neuroimmune mechanisms would mediate the PTSD-DVT link, and that these associations would be stronger in women. This cohort study included N = 106 427 participants from a large biobank. PTSD and DVT were defined using ICD-10 codes. A subset (N = 1520) underwent imaging, from which we assessed stress-associated neural activity (SNA). High-sensitivity C-reactive protein (hs-CRP) levels and heart rate variability (HRV) were used as indicators of systemic inflammation and autonomic activity, respectively. Linear, logistic, and Cox regressions and mediation analyses were used to test our hypotheses. Of 106 427 participants, 4192 (3.9%) developed DVT. PTSD associated with increased DVT risk (HR [95% CI]: 1.66 [1.34, 2.07], p < .001), and this finding remained significant after adjustment for age, sex, and traditional DVT risk factors. When analyzed separately by sex, PTSD was significantly associated with DVT risk in women but not men. Further, heightened SNA and lower HRV mediated the effect of PTSD on DVT risk. Results suggest that individuals with PTSD are at increased risk for DVT, and that risk is higher in women. This relationship was partially driven by alterations in stress-associated neural activity and autonomic function, suggesting potential targets for preventive therapies. Future studies are needed to investigate whether intervening on PTSD-DVT mechanisms has downstream beneficial effects on DVT, especially among women.

Higher arterial stiffness and blunted vagal control of the heart in young women with compared to without a clinical diagnosis of PTSD

PURPOSE

Young women are typically thought to be protected from cardiovascular disease (CVD) before menopause. However, posttraumatic stress disorder (PTSD) increases CVD risk in women by up to threefold. Data in predominantly male cohorts point to physiological mechanisms such as vascular and autonomic derangements as contributing to increased CVD risk. The purpose of the study reported here was to determine whether young women diagnosed with PTSD, compared to those without, present with arterial stiffness and impaired autonomic control of the heart.

METHODS

A total of 73 healthy young women, ranging in age from 18 to 40 years, with a history of trauma exposure were included in this study, 32 with and 41 without a clinical PTSD diagnosis. We measured resting pulse wave velocity (PWV), central hemodynamics, augmentation pressure and augmentation index (AI) via pulse wave analysis using applanation tonometry. Heart rate variability was also assessed via peripheral arterial tone.

RESULTS

In comparison to controls, women with PTSD showed higher central arterial pressure (mean ± standard deviation: systolic blood pressure 104 ± 8 vs. 97 ± 8 mmHg, p < 0.001; diastolic blood pressure 72 ± 7 vs. 67 ± 7 mmHg, p = 0.003), PWV (6 ± 0.3 vs. 5 ± 0.6 m/s, p < 0.001) and AI (22 ± 13 vs. 15 ± 12%, p = 0.007) but lower standard deviation of normal-to-normal intervals (SDNN; 44 ± 17 vs. 54 ± 18 ms, p = 0.005) and root mean square of successive differences between normal heartbeats (RMSSD; 37 ± 17 vs. 51 ± 22 ms, p = 0.002).

CONCLUSION

PTSD in young women is associated with higher brachial and central pressures, increased arterial stiffness and blunted parasympathetic control of the heart. These findings illustrate potential mechanisms underlying high risk for CVD in young women with PTSD, suggesting possible treatment targets for this at-risk group.