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Extraordinarily high prevalences of hypertension in patients with OSA have been reported, however,67 and an elevated apnoea index has been found in up to 48% of unselected hypertensive patients,8-'\" so that a causal link between OSA and hypertension has been suggested. The hypothesis that OSA causes hypertension is favoured by reports of blood pressure returning to normal levels after treatment for OSA.'2-14","year":"1992","unstructured":"October 1992 Revised version received 25 November 1992 Accepted 7 January 1993 sleep apnoea (OSA) predominantly occurs in overweight, middle aged men,3 a close association between hypertension and OSA is not surprising. Extraordinarily high prevalences of hypertension in patients with OSA have been reported, however,67 and an elevated apnoea index has been found in up to 48% of unselected hypertensive patients,8-'\" so that a causal link between OSA and hypertension has been suggested. 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