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Cai, Zongye; Klein, Theo; Geenen, Laurie W.; Tu, Ly; Tian, Siyu; Bosch, Annemien E. van den; Rijke, Yolanda B. de; Reiss, Irwin K. M.; Boersma, Eric; Duncker, Dirk J.; Boomars, Karin A.; Guignabert, Christophe und Merkus, Daphne (2020): Lower Plasma Melatonin Levels Predict Worse Long-Term Survival in Pulmonary Arterial Hypertension. In: Journal of Clinical Medicine, Bd. 9, Nr. 5, 1248

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Abstract

Exogenous melatonin has been reported to be beneficial in the treatment of pulmonary hypertension (PH) in animal models. Multiple mechanisms are involved, with melatonin exerting anti-oxidant and anti-inflammatory effects, as well as inducing vasodilation and cardio-protection. However, endogenous levels of melatonin in treatment-naive patients with PH and their clinical significance are still unknown. Plasma levels of endogenous melatonin were measured by liquid chromatography-tandem mass spectrometry inPHpatients (n = 64, 43 pulmonary arterial hypertension (PAH) and 21 chronic thromboembolic PH (CTEPH)) and healthy controls (n = 111). Melatonin levels were higher in PH, PAH, and CTEPH patients when compared with controls (Median 118.7 (IQR 108.2-139.9), 118.9 (109.3-147.7), 118.3 (106.8-130.1) versus 108.0 (102.3-115.2) pM, respectively, p all <0.001). The mortality was 26% (11/43) in the PAH subgroup during a long-term follow-up of 42 (IQR: 32-58) months. Kaplan-Meier analysis showed that, in the PAH subgroup, patients with melatonin levels in the 1st quartile (<109.3 pM) had a worse survival than those in quartile 2-4 (Mean survival times were 46 (95% CI: 30-65) versus 68 (58-77) months, Log-rank, p = 0.026) with an increased hazard ratio of 3.5 (95% CI: 1.1-11.6, p = 0.038). Endogenous melatonin was increased in treatment-naive patients with PH, and lower levels of melatonin were associated with worse long-term survival in patient with PAH.

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