In:
American Journal of Physiology-Heart and Circulatory Physiology, American Physiological Society, Vol. 318, No. 3 ( 2020-03-01), p. H581-H589
Abstract:
Preeclampsia is associated with the development of cardiovascular diseases later in life. To investigate this phenomenon, we compared established markers of cardiovascular dysregulation between previously preeclamptic women (PPE; n = 12, 13 ± 6 mo postpartum, 34 ± 6 yr) and women who had previously had an uncomplicated pregnancy [control (CTRL); n = 12, 15 ± 4 mo postpartum; 29 ± 3 yr]. We hypothesized that PPE would present with elevated arterial stiffness (assessed as central and peripheral pulse wave velocity) and muscle sympathetic nerve activity (MSNA; microneurography) and blunted baroreflex sensitivity (BRS) relative to CTRL. Blood pressure (Finometer) was similar between PPE and CTRL (mean arterial pressure: 94 ± 11 vs. 89 ± 9, P = 0.16). Central (6.92 ± 0.21 vs. 6.24 ± 0.22 m/s, P = 0.04) but not peripheral arterial stiffness (7.52 ± 0.19 vs. 7.09 ± 0.19 m/s, P = 0.13) was elevated in PPE versus CTRL (values normalized to MAP). MSNA was also elevated in PPE versus CTRL (22 ± 7 vs. 13 ± 5 bursts/min, P = 0.01), although this was independent of arterial stiffness (central: r 2 = 0.01, P = 0.74; peripheral: r 2 = 0.01, P = 0.74). Cardiovagal BRS was blunted in PPE versus CTRL (15 ± 5 vs. 28 ± 1 ms/mmHg, P = 0.01), whereas sympathetic vascular BRS was similar (−3.2 ± 0.9 vs. −3.1 ± 1.4 bursts·100 hb −1 ·mmHg −1 , P = 0.88). Cardiovagal and sympathetic BRS were inversely correlated in both CTRL ( r 2 = 0.43; P = 0.05) and PPE ( r 2 = 0.69; P = 0.04), supporting a compensatory mechanism resulting in normal blood pressures in both groups. Overall, these data indicate that PPE retain their ability to buffer elevated MSNA. We propose that the higher incidence of cardiovascular disease observed later in life in PPE results from this arterial stiffness, combined with the loss of protective vascular mechanisms and the “unmasking” of high MSNA. NEW & NOTEWORTHY We demonstrate that resting muscle sympathetic nerve activity is elevated in women with a recent history of preeclampsia relative to women who have recently had uncomplicated pregnancies and without a history of preeclampsia. Structural changes in the central arteries are associated with arterial stiffness following preeclampsia, independent of changes in the sympathetic nervous system. The structural changes are observed in these relatively young previously preeclamptic women, indicating elevated cardiovascular risk. Our data suggest that with aging (and the gradual loss of vascular protection for women, as established by others), this risk will become exaggerated compared with women who have had normal pregnancies. Listen to this article’s corresponding podcast at: https://ajpheart.podbean.com/e/behind-the-bench-episode-4/ .
Type of Medium:
Online Resource
ISSN:
0363-6135
,
1522-1539
DOI:
10.1152/ajpheart.00578.2019
Language:
English
Publisher:
American Physiological Society
Publication Date:
2020
detail.hit.zdb_id:
1477308-9
SSG:
12
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