Parasympathetic response in women with coronary vascular dysfunction during mental stress compared to those with non-cardiac chest pain and reference controls
Puja K. Mehta , Shafa-at A. Sheikh , Esha K. Dave , Rahim K. Shakoor , Tina Torbati , Amit Shah , Marc D. Thames , Liu Qiang , Yi-An Ko , Janet Wei , Chrisandra Shufelt , Michael D. Nelson , Bruce Samuels , Babak Azarbal , Jeanie Park , Michael R. Irwin , David S. Krantz , C. Noel Bairey Merz
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引用次数: 0
Abstract
Background
Coronary vascular dysfunction (CVaD) contributes to ischemia even in the absence of obstructive coronary artery disease. We hypothesize that abnormal autonomic reactivity to mental stress is a key pathophysiologic mechanism in CVaD compared to non-cardiac chest pain (NCCP) and reference control (RC) groups.
Methods
Seventy women (35 with CVaD diagnosed by coronary function testing, 19 with NCCP, and 16 RC) underwent mental stress testing (arithmetic and anger recall) in the Cardiac Autonomic Nervous System study. RC group was asymptomatic with no risk factors and normal exercise treadmill testing. Frequency domain heart rate variability (HRV, ms2) was obtained at baseline and during mental stress, with high frequency (HF) power as an accepted parasympathetic measure. Low frequency (LF)/HF ratio may reflect sympathetic dominance. ANOVA was used for comparisons.
Results
CVaD group was older compared to NCCP (57.1 ± 9.6 vs. 50.4 ± 11.3 years, p = 0.025, respectively), but age-matched to RC group (54.6 ± 14.5, p = 0.45). HRV was similar at baseline among the groups. During anger recall, CVaD group had lower HF HRV vs. NCCP (5.03 ± 1.05 vs 6.00 ± 1.17, p = 0.006, respectively), but not vs. RC (5.74 ± 1.02, p = 0.077). During arithmetic, CVaD group had lower HF HRV vs. NCCP (5.06 ± 1.12 vs. 6.00 ± 1.17, p = 0.007, respectively) and RC (6.04 ± 0.83, p = 0.01) groups. LF/HF ratio did not differ among the three groups.
Conclusions
Women with CVaD demonstrate a greater stress-induced vagal withdrawal compared to those with NCCP and RC women. Further work to investigate altered autonomic responses as a mechanism in CVaD is warranted.
期刊介绍:
IJC Heart & Vasculature is an online-only, open-access journal dedicated to publishing original articles and reviews (also Editorials and Letters to the Editor) which report on structural and functional cardiovascular pathology, with an emphasis on imaging and disease pathophysiology. Articles must be authentic, educational, clinically relevant, and original in their content and scientific approach. IJC Heart & Vasculature requires the highest standards of scientific integrity in order to promote reliable, reproducible and verifiable research findings. All authors are advised to consult the Principles of Ethical Publishing in the International Journal of Cardiology before submitting a manuscript. Submission of a manuscript to this journal gives the publisher the right to publish that paper if it is accepted. Manuscripts may be edited to improve clarity and expression.