Water sealed drainage (WSD) is one of therapies for lung disease. The purpose of this research is to determine the features of patients who were WSD-treated in Integrated Pulmonology Departement of Arifin Achmad General Hospital Riau Province. This study used descriptive retrospective method on patient’s medical record from 1th January 2017 – 31th December 2019. WSD was done on 102 patients…