Symptom Severity and Beat-to-Beat Blood Pressure Variability in Patients with Post-Traumatic Stress Disorder (PTSD)

Abstract

Individuals with post-traumatic stress disorder (PTSD) have an elevated risk of developing cardiovascular disease. Emerging research suggests that blood pressure variability (BPV) may serve as an early indicator for increased cardiovascular disease risk. However, the relationship between post-traumatic stress symptom severity and symptom clusters, and comorbid conditions such as depression, with BPV is unclear. Purpose: The primary objective of this study was to investigate the relationship between the severity of PTSD and depression symptoms, PTSD symptom clusters, and beat-to-beat blood pressure variability (BPV) in a sample of individuals diagnosed with PTSD. We hypothesized that participants with greater PTSD symptom severity would have increased BPV. Methods: Twenty participants (mean age = 46 ± 10 yr; 70% males; 75% African American) with diagnosed PTSD were enrolled. PTSD severity and symptom clusters were assessed via the PTSD Checklist (PCL-5) and depression symptoms were assessed via Beck's Depression Inventory (BDI). Beat-to-beat blood pressure was recorded via finger photoplethysmography for a five-minute duration. BPV indices were calculated as the coeffcient of variation (CV), standard deviation (SD), and average real variability (ARV) for systolic, diastolic, and mean blood pressure. Pearson correlations were conducted to evaluate the association between symptoms and BPV outcomes. Participants were also categorized into two groups based on symptom severity. Independent t-tests were used to compare those with mild to moderate symptoms (n = 7) relative to participants with severe and extreme PTSD symptoms (n = 13). Results: PTSD symptom severity was significantly correlated with depression symptoms (r = 0.83, p < 0.001). However, there were no significant correlations between BPV measures and either PTSD or depression symptoms. We did observe moderate non-significant correlations between the PTSD intrusive symptom cluster and diastolic and mean blood pressure CV (r = 0.33 and r = 0.29, p > 0.05). Similar moderate correlations were observed between depression symptoms and diastolic and mean blood pressure CV (r = 0.31 and r = 0.29, p > 0.05). No significant differences were observed between the two symptom severity groups in terms of systolic, diastolic, and mean blood pressure for CV, SD, and ARV (systolic CV 0.61 ± 0.17 vs. 0.62 ± 0.17 %, p > 0.05, diastolic CV, 0.70 ± 0.06 vs. 0.72 ± 0.16 %, p > 0.05, and mean blood pressure CV 0.63 ± 0.09 vs. 0.65 ± 0.15 %, p > 0.05 for mild to moderate and severe to extreme PTSD symptoms, respectively). Conclusions: Contrary to our hypothesis, those with greater PTSD symptom severity did not have significantly greater BPV. In summary, our data demonstrate that higher PTSD symptoms are not associated with beat-to-beat BPV; however, the moderate correlations suggest that larger studies are needed to determine if PTSD intrusive symptoms and depression symptoms, are related beat-to-beat BPV indices. VA Merit I01-CX001065, and DOD PR210574. M. McGranahan is supported by NIDDK training grant TL1DK129502 and U2CDK129501. This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.