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Table 3 Definition of bleeding used by the Bleeding Academic Research Consortium [57]

From: Clinical review: Bleeding - a notable complication of treatment in patients with acute coronary syndromes: incidence, predictors, classification, impact on prognosis, and management

Type Definition
Type 0 No bleeding
Type 1 Bleeding that is not actionable and does not cause the patient to seek unscheduled performance of studies, hospitalization, or treatment by a health-care professional
Type 2 Any overt, actionable sign of hemorrhage (for example, more bleeding than would be expected for a clinical circumstance, including bleeding found by imaging alone) that does not fit the criteria for type 3, 4, or 5 but does meet at least one of the following criteria: (1) requiring non-surgical, medical intervention by a health-care professional, (2) leading to hospitalization or increased level of care, and (3) prompting evaluation
Type 3  
Type 3a Overt bleeding plus hemoglobin drop of 3 to 5 g/dLa (provided that hemoglobin drop is related to bleed)
Any transfusion with overt bleeding
Type 3b Overt bleeding plus hemoglobin drop at least 5 g/dLa (provided that hemoglobin drop is related to bleed)
Cardiac tamponade
Bleeding requiring surgical intervention for control (excluding dental/nasal/skin/hemorrhoid)
Bleeding requiring intravenous vasoactive drugs
Type 3c Intracranial hemorrhage (does not include microbleeds or hemorrhagic transformation; does include intraspinal)
Subcategories; confirmed by autopsy or imaging or lumbar puncture
Intra-ocular bleed compromising vision
Type 4: CABG-related bleeding Perioperative intracranial bleeding within 48 hours
Reoperation following closure of sternotomy for the purpose of controlling bleeding
Transfusion of at least 5 units of whole blood or packed red blood cells within a 48-hour periodb
Chest tube output of at least 2 L within a 24-hour period
If a CABG-related bleed is not adjudicated as at least a type 3 severity event, it will be classified as 'not a bleeding event'
Type 5: fatal bleeding  
Type 5a Probable fatal bleeding: no autopsy or imaging confirmation, but clinically suspicious
Type 5b Definite fatal bleeding: overt bleeding or autopsy or imaging confirmation
  1. Platelet transfusions should be recorded and reported but are not included in these definitions until further information is obtained about the relationship to outcomes. aCorrected for transfusion (1 unit of packed red blood cells or 1 unit of whole blood = 1 g/dL hemoglobin). bOnly allogeneic transfusions are considered transfusions for Bleeding Academic Research Consortium (BARC) type 4 bleeding. Cell saver products will not be counted. CABG, coronary artery bypass graft.