Nocturnal hypertension and impaired sympathovagal tone in Turner syndrome

Journal of Hypertension
Claus Højbjerg GravholtJens Sandahl Christiansen

Abstract

Increased blood pressure (BP), night: day BP ratio, and heart rate is seen in Turner syndrome (TS), and an increased risk of ischaemic heart disease and type 2 diabetes, as well as aortic dilatation and dissection. We hypothesized that altered heart rate variability is present in TS in comparison with controls, and can be influenced by hormonal replacement therapy (HRT). We examined the impact of HRT on sympathovagal control of heart rate variability. Patients (n = 8, aged 29.5 +/- 5.3 years; no treatment or HRT) and controls (n = 8, aged 28.5 +/- 4.2 years; no treatment) were examined by short-term spectral analysis (supine-standing), bedside neuropathy tests, and 24-h ambulatory BP. N-terminal pro-brain natriuretic peptide (BNP), renin, aldosterone and urinary albumin excretion was determined. The interaction between position and status (TS or control) was examined for data from spectral analysis. Low-frequency (LF) power, coefficient of component variation of LF (both measures of sympathetic and vagal activity), and the LF: high-frequency (HF) power ratio (a measure of sympathovagal balance) were diminished in TS compared with controls, especially during standing. Systolic and diastolic night ambulatory BP (both P = 0.03), a...Continue Reading

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