Impact of L-arginine and liposomal vitamin C supplementation on quality of life and daily life activities in patients with COPD: a randomized, multicenter, single blind, placebo-controlled trial (ILDA study).
Dejan Radovanovic, Juan Camilo Signorello, Giuseppe Fuccia, Giada Lazzaroni, Fiammetta Danzo, Gualtiero Maria Guandalini, Federica Massaro, Francesco Tursi, Pierachille Santus
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引用次数: 0
Abstract
Objective: Chronic Obstructive Pulmonary Disease (COPD) patients experience limitations in activities of daily living (ADL) despite optimal inhaled treatment. L-arginine depletion is associated with poor exercise performance. Our aim was to assess whether oral L-arginine supplementation improves dyspnea and ADL in COPD patients.
Design and methods: Randomized, multicenter, single blind, placebo-controlled study (NCT05412160). Stable COPD patients received L-arginine (1.66 g) plus liposomal vitamin C (500 mg) twice daily or placebo for 4 weeks. At baseline (T0) and after treatment (T1) lung function, six minutes walking test (6MWT), dyspnea and ADL perfomance, evaluated through: COPD assessment test (CAT), self-administered chronic respiratory questionnaire (CRQ-SA), Clinical COPD Questionnaire 24 h and 7 days (CCQ) and London Chest Activity of Daily Living Scale (LCADL) -were assessed. The primary endpoint was CRQ score change compared with placebo.
Results: 150 patients were enrolled (67 % males, median FEV1 57 %predicted), with 76 receiving L-arginine. Baseline characteristics and questionnaire scores were balanced between arms. At T1, L-arginine patients demonstrated significant improvements compared to placebo in CRQ total score (median (IQR) 3.5 (0.0;6.75); P = 0.006), CRQ dyspnea domain (3.0 (0.0;6.0); P < 0.001); LCADL total score (-1.0 (-3.0;0.0); P = 0.005); LCADL housework (-1.0 (-3.0;0.0); P < 0.001) and LCADL free time (0.0 (-1.0;0.0); P = 0.003). More L-arginine patients reached the minimal clinically important difference (MCID) in CRQ dyspnea and total LCADL. Baseline CRQ dyspnea<20 (OR (95 %CI): 4.296 (2.051-8.999); P < 0.001) and a LCADL score<27 (7.126 (2.729-18.609); P < 0.001) predicted MCID response.
Conclusion: Oral supplementation with L-arginine added to inhaled therapy appears to improve dyspnea and ADL in COPD.
期刊介绍：
The European Journal of Internal Medicine serves as the official journal of the European Federation of Internal Medicine and is the primary scientific reference for European academic and non-academic internists. It is dedicated to advancing science and practice in internal medicine across Europe. The journal publishes original articles, editorials, reviews, internal medicine flashcards, and other relevant information in the field. Both translational medicine and clinical studies are emphasized. EJIM aspires to be a leading platform for excellent clinical studies, with a focus on enhancing the quality of healthcare in European hospitals.
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