TY - JOUR T1 - Parathyroid hormone: a neglected biomarker of exacerbations and hospitalizations in patients with COPD and hypovitaminosis D JF - European Respiratory Journal JO - Eur Respir J DO - 10.1183/13993003.congress-2021.PA3830 VL - 58 IS - suppl 65 SP - PA3830 AU - Carlos Antonio Amado Diago AU - Mayte García-Unzueta AU - Juan Agüero Calvo AU - Paula Martín Audera AU - Sandra Tello Mena AU - Sheila Izquierdo Cuervo AU - Guido Andretta Juarez AU - Joy Selene Osorio Chavez AU - Marta Cristeto Porras AU - Laura Gonzalez Ramos AU - Noelia Borja Vargas AU - Armando Raul Guerra AU - Milagros Ruiz De Infante Pérez AU - Ana Berja Y1 - 2021/09/05 UR - http://erj.ersjournals.com/content/58/suppl_65/PA3830.abstract N2 - Background: Hypovitaminosis D has been linked to deterioration in clinical parameters and lung function in COPD. As a response to low levels of vitamin D serum Parathyroid Hormone (iPTH) is increased in some, but not all, patients. The aim of this study was to determine whether COPD patients with elevated PTH levels are at higher risk of COPD exacerbations and hospitalizations.Methods: 166 COPD outpatients were randomly preselected. Clinical and analytical characteristics were assessed at baseline. After excluding patients with other conditions known to disturb calcium metabolism 141 patients were identified. Except one, all patients were prospectively followed for 12 months after obtaining the blood samples. Hypovitaminosis D was considered when serum 25(OH)D <30 ng/mL. Secondary hyperparathyroidism was considered when serum iPTH was higher than normal (50 pg/mL) in patients with hypovitaminosis D. COPD exacerbations and hospital admissions were recorded during the follow-up.Results: Prevalence of hypovitaminosis D in COPD patients was 89.3%, prevalence of secondary hyperparathyroidism associated with hypovitaminosis D was 22,9%. Cox proportional risk analysis showed that patients belonging to the high iPTH-low 25(OH)D group were at a higher risk of moderate COPD exacerbations (HR 1.81 (CI95% 1.043-3.127), p=0.035) and hospital admissions (HR 5.45 (CI95% 2.018-14.720), p=0.002) as compared with those with normal iPTH-low 25(OH)D levels.Conclusions: COPD patients with hypovitaminosis D and elevated iPTH have higher risk of moderate exacerbations and hospitalizations than those with hypovitaminosis D and normal iPTH.FootnotesCite this article as: European Respiratory Journal 2021; 58: Suppl. 65, PA3830.This abstract was presented at the 2021 ERS International Congress, in session “Prediction of exacerbations in patients with COPD”.This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only). ER -