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Objectives: To compare the responses of heart rate and blood pressure to various autonomic tests in women with and without pre-treatment hot flushes during estradiol and estradiol+medroxyprogesterone acetate (MPA) use., Study Design and Main Outcome Measures: Hundred and fifty recently postmenopausal women (72 with and 78 without hot flushes) were randomized to receive transdermal estradiol (1mg/day), oral estradiol (2 mg/day) alone or in combination with MPA (5mg/day), or placebo for six months. Cardiovascular responsiveness was comprehensively assessed with controlled and deep breathing, active orthostatic test, Valsalva maneuver and handgrip test., Results: Hot flushes were accompanied with a significant reduction (-2.2±0.7 vs. 1.3±1.1 beats/min, p=0.03) in resting heart rate during estradiol-only treatment; the route of estradiol administration was no factor in this regard. This effect was attenuated by the addition of MPA to oral estradiol. Hot flushes were also associated with reduced maximal heart rate in response to handgrip during the use of estradiol-only therapy (-2.2±1.3 vs. 2.8±1.5 beats/min, p=0.038); again, the MPA addition eliminated this effect. Hot flushes were accompanied with lowered resting but augmented blood pressure responses to handgrip test during all hormone regimens, whereas in women without hot flushes estradiol-only regimen tended to elevate diastolic resting blood pressure., Conclusions: Hot flushes appear as determinants for cardiovascular responses to hormone therapy. Estradiol-only therapy causes beneficial changes in cardiovascular regulation in flushing women, and these are blunted, in part, by the addition of MPA., (Copyright © 2012 Elsevier Ireland Ltd. All rights reserved.)

Objectives: During menopausal transition autonomic balance is known to shift towards sympathetic dominance, but the role of vasomotor hot flushes in this phenomenon is not understood. We compared cardiovascular autonomic responsiveness between women with and without hot flushes., Study Design and Main Outcome Measures: One hundred fifty recently postmenopausal healthy women with varying degree of hot flushes (none, mild, moderate, severe) underwent comprehensive cardiovascular autonomic nervous testing (controlled and deep breathing, active orthostatic test, Valsalva manoeuvre and handgrip test) assessing both sympathetic and parasympathetic activity. The responses of heart rate, heart rate variability and blood pressure in these tests were evaluated., Results: Responses in heart rate showed differences between the study groups only in the Valsalva manoeuvre where the tachycardia ratio in all symptomatic women was lower (p=0.041) than in women without hot flushes. Neither change in the heart rate variability analyses nor the blood pressure responses were affected by hot flush status. However, there was a non-significantly higher maximum systolic (140 (112-182)mmHg vs. 135 (102-208)mmHg) and diastolic blood pressure (94 (72-112)mmHg vs. 90 (66-122)mmHg) following the handgrip test in women without hot flushes vs. all the symptomatic women., Conclusions: Menopausal hot flushes seem to be associated with a possibly increased sympathetic preponderance without an effect on parasympathetic activity in cardiovascular autonomic responses. This may imply a potentially negative impact on cardiovascular health in women experiencing hot flushes., (Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.)

Background: Menopausal hot flushes may be a marker for a difference in vascular function. We studied the associations between hot flushes of varying severity and ambulatory blood pressure (BP) and heart rate (HR)., Methods: A total of 147 women with onset of menopause within the preceding 6-36 months reported no hot flushes (n = 23) or mild (n = 33), moderate (n = 30), or severe (n = 61). Ambulatory BP and HR were registered for 24 hours. The variables, analyzed separately for day-time and night-time, were compared among the four study groups., Results: Hot flushes failed to show any relationship to mean day- or night-time BP, nocturnal dipping of BP, or HR. However, severe night-time hot flushes were accompanied by elevations in systolic BP (4.1 +/- 10.5 mmHg, P = 0.061), diastolic BP (3.1 +/- 6.8 mmHg, P = 0.032), and heart rate (3.0 +/- 7.2 beats/minute, P = 0.043)., Conclusion: Hot flushes are not associated with ambulatory BP or heart rate in normotensive, recently post-menopausal women, although severe night-time hot flush episodes are followed by significant elevations in BP and heart rate. The latter may be of clinical significance.

A vast majority of menopausal women suffer from vasomotor symptoms, such as hot flushes and night sweats, the mean duration of which may be up to 7-10 years. In addition to a decreased quality of life, vasomotor symptoms may have an impact on overall health. Vasomotor symptoms are associated with overactivity of the sympathetic nervous system, and sympathetic overdrive in turn is associated with metabolic syndrome, which is a known risk factor for cardiovascular disease. Menopausal hot flushes have a complex relationship to different features of the metabolic syndrome and not all data point towards an association between vasomotor symptoms and metabolic syndrome. Thus, it is still unclear whether vasomotor symptoms are an independent risk factor for metabolic syndrome. Research in this area is constantly evolving and we present here the most recent data on the possible association between menopausal vasomotor symptoms and the metabolic syndrome. [ABSTRACT FROM AUTHOR]

Hot flushes are complained of by approximately 75% of all postmenopausal women, and hormone therapy (HT) is the most effective way to alleviate them. Hot flushes are characterized by altered vascular function and sympathetic nervous system activity. Hot flushes occurred more often in women attending large, non-randomized observational studies (e.g. Nurses'' Health Study), where HT use protected against cardiovascular disease (CVD). However, they were absent (or mild) in randomized HT trials where HT use was accompanied with an elevated risk for CVD. Hot flushes, if a factor for cardiovascular health, could partly explain the conflict between observational and randomized trials. Several cross-sectional studies imply that hot flushes are detrimental to the cardiovascular system. However, the data are not uniform, and hot flushes were recalled retrospectively or during HT use. In our prospective study hot flushes were accompanied with a vasodilatory effect during endothelial testing, and this was related to the severity of hot flushes. Night-time hot flushes were followed with transient rises in ambulatory blood pressure (BP). However, no effect of hot flushes on diurnal BP was detected. The use of estradiol showed no harmful effects on endothelial function in women with hot flushes, but in non-flushing women oral, but not transdermal, estradiol led to vasoconstrictive changes. Estradiol complemented with medroxyprogesterone acetate eliminated the vasoconstrictive effect of sole oral estradiol. Thus, both oral and transdermal estradiol are applicable in flushing women, whereas a transdermal route should be favored in non-flushing women if used e.g. for bone protection. [ABSTRACT FROM AUTHOR]