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• W4309183719 endingPage "2022" @default.
• W4309183719 startingPage "00412" @default.
• W4309183719 abstract "Background COPD may predispose to symptomatic pulmonary hypertension at high altitude. We investigated haemodynamic changes in lowlanders with COPD ascending to 3100 m and evaluated whether preventive acetazolamide treatment would attenuate the altitude-induced increase in pulmonary artery pressure (PAP). Methods In this randomised, placebo-controlled, double-blind, parallel-group trial, patients with COPD Global Initiative for Chronic Obstructive Lung Disease grades 2–3 who were living <800 m and had peripheral oxygen saturation ( S pO 2 ) >92% and arterial carbon dioxide tension <6 kPa were randomised to receive either acetazolamide (125–250 mg·day −1 ) or placebo capsules, starting 24 h before ascent from 760 m and during a 2-day stay at 3100 m. Echocardiography, pulse oximetry and clinical assessments were performed at 760 m and after the first night at 3100 m. Primary outcome was PAP assessed by tricuspid regurgitation pressure gradient (TRPG). Results 112 patients (68% men, mean± sd age 59±8 years, forced expiratory volume in 1 s (FEV 1 ) 61±12% pred, S pO 2 95±2%) were included. Mean± sd TRPG increased from 22±7 to 30±10 mmHg in 54 patients allocated to placebo and from 20±5 to 24±7 mmHg in 58 patients allocated to acetazolamide (both p<0.05) resulting in a mean (95% CI) treatment effect of −5 (−9 to −1) mmHg (p=0.015). In patients assigned to placebo at 760/3100 m, mean± sd S pO 2 was 95±2%/88±3%; in the acetazolamide group, the respective values were 94±2%/90±3% (both p<0.05), resulting in a treatment effect of +2 (1 to 3)% (p=0.001). Conclusions In lowlanders with COPD travelling to 3100 m, preventive acetazolamide treatment attenuated the altitude-induced rise in PAP and improved oxygenation." @default.
• W4309183719 created "2022-11-24" @default.
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• W4309183719 date "2022-11-17" @default.
• W4309183719 modified "2023-09-30" @default.
• W4309183719 title "Effect of acetazolamide on pulmonary vascular hemodynamics in patients with COPD going to altitude: a randomized, placebo-controlled, double-blind trial" @default.
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• W4309183719 doi "https://doi.org/10.1183/23120541.00412-2022" @default.
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