{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,29]],"date-time":"2025-10-29T02:50:42Z","timestamp":1761706242494,"version":"3.37.3"},"reference-count":46,"publisher":"European Respiratory Society (ERS)","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Eur Respir J"],"accepted":{"date-parts":[[2002,10,23]]},"published-print":{"date-parts":[[2003,3]]},"abstract":"<jats:p>The aim of this study was to investigate whether chronic continuous positive airway pressure (CPAP) affects blood pressure (BP) responsiveness to obstructive events occurring on the first night of CPAP withdrawal in obstructive sleep apnoea (OSA) after chronic treatment.<\/jats:p><jats:p>Thirteen male subjects with severe OSA underwent nocturnal polysomnography with beat\u00adby\u00adbeat BP monitoring before treatment and after 4.9\u00b13.4 months of home CPAP (mean daily use 5.1\u00b11.7\u2005h). Variations in oxyhaemoglobin saturation (\u0394<jats:italic>S<\/jats:italic><jats:sub>a,O<jats:sub>2<\/jats:sub><\/jats:sub>), systolic (\u0394<jats:italic>P<\/jats:italic><jats:sub>s<\/jats:sub>), and diastolic (\u0394<jats:italic>P<\/jats:italic><jats:sub>d<\/jats:sub>) BP within nonrapid eye movement apnoeas and hypopnoeas were measured on a sample of pre\u00ad and post\u00adtreatment events. In addition, a pretreatment sample was selected for \u0394<jats:italic>S<\/jats:italic><jats:sub>a,O<jats:sub>2<\/jats:sub><\/jats:sub>to match post\u00adtreatment events.<\/jats:p><jats:p>The higher the mean \u0394<jats:italic>S<\/jats:italic><jats:sub>a,O<jats:sub>2<\/jats:sub><\/jats:sub>was in the full pretreatment sample, the more \u0394<jats:italic>S<\/jats:italic><jats:sub>a,O<jats:sub>2<\/jats:sub><\/jats:sub>, \u0394<jats:italic>P<\/jats:italic><jats:sub>s<\/jats:sub>and \u0394<jats:italic>P<\/jats:italic><jats:sub>d<\/jats:sub>were attenuated after treatment. Mean \u0394<jats:italic>P<\/jats:italic><jats:sub>s<\/jats:sub>decreased from 47.3\u00b18.5 in the full pretreatment sample to 42.2\u00b16.9 in the selected pretreatment sample, to 31.5\u00b15.9\u2005mmHg in the post\u00adtreatment sample. The post\u00adtreatment value differed significantly from both the pretreatment values. The corresponding values for mean \u0394<jats:italic>P<\/jats:italic><jats:sub>d<\/jats:sub>were 27.0\u00b13.5, 24.0\u00b13.1 and 19.6\u00b13.7\u2005mmHg, with all values differing significantly from each other.<\/jats:p><jats:p>Chronic continuous positive airway pressure is followed by a decrease in apnoea\/hypopnoea\u00adrelated blood pressure swings, possibly secondary to both reduced severity of event\u00adrelated hypoxaemia and decreased responsiveness to obstructive events secondary to chronic prevention of nocturnal intermittent hypoxaemia.<\/jats:p>","DOI":"10.1183\/09031936.03.00039803a","type":"journal-article","created":{"date-parts":[[2008,9,19]],"date-time":"2008-09-19T17:25:02Z","timestamp":1221845102000},"page":"509-514","source":"Crossref","is-referenced-by-count":11,"title":["Blood pressure responsiveness to obstructive events during sleep after chronic 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