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Pathogenesis and management of delayed orthostatic hypotention in patients with chronic fatigue syndrome

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Abstract

The relationship between orthostatic hypotension and chronic fatigue syndrome (CFS) has been reported previously. To study the parthogenesis and management of delayed orthostatic hypotension in patients with CFS, a case comparison study with follow-up of 8 weeks has been designed. A group of 78 patients with CFS (mean age 40 years; 49% men and 51% women), who fulfilled the Centre for Disease Control and Prevention criteria were studied. There were 38 healthy controls (mean age 43 years; 47% men and 53% women). At entry to the study each subject underwent an upright tilt-table test, and clinical and laboratory evaluation. Patients with orthostatic hypotension were offered therapy with sodium chloride (1200 mg) in a sustainedrelease formulation for 8 weeks, prior to resubmission to the tilt-table testing, and clinical and laboratory evaluation. An abnormal response to upright tilt was observed in 22 of 78 patients with CFS. After sodium chloride therapy for 8 weeks, tilt-table testing was repeated on the 22 patients with an abnormal response at baseline. Of these 22 patients, 10 redeveloped orthostatic hypotension, while 11 did not show an abnormal response to the test and reported an improvement of CFS symptoms. However, those CFS patients who again developed an abnormal response to tilt-test had a significantly reduced plasma renin activity (0.79 pmol/ml per h) compared both with healthy controls (1.29 pmol/ml per h) and with those 11 chronic fatigue patients (1.0 pmol/ml per h) who improved after sodium chloride therapy (p=0.04). In conclusion, in our study CFS patients who did not respond to sodium chloride therapy were found to have low plasma renin activity. In these patients an abnormal renin-angiotensin-aldosterone system could explain the pathogenesis of orthostatic hypotension and the abnormal response to treatment.

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De Lorenzo, F., Hargreaves, J. & Kakkar, V.V. Pathogenesis and management of delayed orthostatic hypotention in patients with chronic fatigue syndrome. Clinical Autonomic Research 7, 185–190 (1997). https://doi.org/10.1007/BF02267980

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