Tranexamic Acid Versus Adrenaline for Controlling Iatrogenic Endobronchial Bleeding

Inclusion Criteria: * patients with endobronchial bleeding during diagnostic bronchoscopy that was not successfully controlled with cold (4°C) normal saline (3 aliquots of 5ml during 60sec) Exclusion Criteria: * Any patient with a contraindication for diagnostic flexible bronchoscopy * Coagulopathy (PV INR \>1.3) * Thrombocytopenia (\<50x10\^9) or anemia (hgb \<80 g/L) * Direct oral anticoagulant, low molecular weight heparin or antiplatelet drug therapy * Thrombophilia, history of pulmonary embolism or deep vein thrombosis * Contraindication for endobronchial application of adrenaline * Coronary heart disease, cerebrovascular disease, history of tachyarrhythmia * Uncontrolled pulmonary hypertension * Cardiovascular decompensation * Severe hypoxia (PaO2 \<60mmHg, SaO2 \<90% with an FiO2 \>=60%)