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Cardiovascular autonomic function in Cushing’s syndrome

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Abstract

Cardiac autonomic dysfunction is associated with increased cardiovascular mortality. No data on sympathovagal balance are available in patients with Cushing’s syndrome, in whom cardiovascular risk is high. We studied 10 patients with newly diagnosed Cushing’s syndrome (1 male/9 females; age mean±SD, 47±10 yr) and 10 control subjects matched for age, sex, body mass index, and cardiovascular risk factors. In both groups there were 7 patients with arterial hypertension, 3 with diabetes mellitus, and 2 with obesity. Cardiac autonomic function was evaluated by analysis of short-time heart rate variability (HRV) measures in frequency domain over 24-h, daytime, and nighttime. The 24-h ambulatory blood pressure monitoring and echocardiography were also performed. In comparison with controls, patients with Cushing’s syndrome had lower 24-h (1.3±0.6 vs 3.7±1.5, mean±SD, p<0.01), daytime (2.0±1.4 vs 4.5±1.6, p<0.01), and night-time (1.0±0.4 vs 3.5±2.3, p<0.01) low-frequency/high frequency (LF/HF) power ratio. In the presence of similar LF power, the difference was due to elevation in HF power in Cushing’s syndrome compared to controls: 24-h, 12.7±6.7 vs 5.8±2.8, p<0.01; daytime, 10.2±7.3 vs 4.5±2.1, p<0.05; nighttime, 14.2±7.0 vs 7.8±4.7, p<0.05. Eight Cushing patients vs 4 controls had a non-dipping blood pressure profile. At echocardiography, Cushing patients had a greater left ventricular mass index and/or relative wall thickness, and impaired diastolic function, compared with controls. Compared to controls, patients with Cushing’s syndrome showed a sympathovagal imbalance, characterized by a relatively increased parasympathetic activity. Whether this autonomic alteration is meant to counterbalance cortisol-induced effects on blood pressure and cardiac structure/function or has a different pathophysiological significance is still unknown.

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Authors and Affiliations

  1. Department of Medical and Surgical Sciences, University of Padova, Via Ospedale 105, 35128, Padova, Italy

    F. Fallo MD, P. Maffei, A. Dalla Pozza, M. Carli & P. Della Mea

  2. Department of Cardiac, Thoracic and Vascular Sciences, University of Padua, Padua

    M. Lupia

  3. Department of Medicine and Experimental Oncology, University of Turin, Turin

    F. Rabbia

  4. Department of Statistical Sciences and Department of Mental Health, University of Padua, Padua, Italy

    N. Sonino

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  1. F. Fallo MD
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  2. P. Maffei
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  3. A. Dalla Pozza
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  4. M. Carli
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  5. P. Della Mea
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  8. N. Sonino
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Correspondence to F. Fallo MD.

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Fallo, F., Maffei, P., Pozza, A.D. et al. Cardiovascular autonomic function in Cushing’s syndrome. J Endocrinol Invest 32, 41–45 (2009). https://doi.org/10.1007/BF03345677

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