Supplementary Table S1. Panel composition Panel member Specialty Affiliation Ira Shulman, MD Transfusion Medicine University of Southern California, Los Angeles, CA Aryeh Shander, MD FCCM FCCP Anesthesiology and Critical care Englewood Hospital and Medical Center, Englewood, NJ Phillip Bahramipour, MD Radiology University of Medicine and Dentistry of New Jersey, Newark, NJ Michael Diringer, MD Neurology Washington University School of Medicine, Saint Louis, MO Matthew Flaherty, MD Neurology University of Cincinnati Academic health Center, Cincinnati, OH Edward Michelson, MD FACEP Emergency Medicine Case Western Reserve University School of Medicine and University Hospitals Case Medical Center, Cleveland, OH Babak Sarani, MD FACS FCCM Trauma and Surgical Critical Care George Washington University, Washington, DC Independent post hoc review panel Neil Blumberg, MD Laboratory Medicine University of Rochester Medical Center, School of Medicine and Dentistry, Rochester, NY Maureane Hoffman, MD PhD Clinical pathology Duke University, Durham VA Medical Center, Durham, NC Lewis Kaplan, MD FACS FCCM FCCP Trauma Surgery Yale University School of Medicine, New Haven, CT Majed Refaai, MD Transfusion Medicine University of Rochester Medical Center, School of Medicine and Dentistry, Rochester, NY Johnathan Waters, MD Anesthesiology University of Pittsburgh, Pittsburgh, PA John Peter Gruen, MD Neurosurgery Keck School of Medicine, University of Southern California, Los Angeles, CA Supplementary Table S2. Composition of search phrases for literature searches Terms included in plasma search phrase Terms included in bleeding search phrase Terms included in CNS search phrase plasma [Mesh] fresh frozen plasma fresh-frozen plasma FFP thawed plasma liquid plasma (plasma AND 24 AND phlebotomy) FP24 FP-24 PF24 PF-24 cryoprecipitate-poor plasma (solvent AND detergent AND plasma) (solvent/detergent AND plasma) (S/D AND plasma) Octaplas (methylene blue AND plasma) (psoralen AND ultraviolet AND plasma) (amotosalen AND ultraviolet AND plasma) INTERCEPT plasma (riboflavin AND ultraviolet AND plasma) Mirasol plasma bleed bleeding blood loss hemorrhage hemorrhagic haemorrhage haemorrhagic hematoma haematoma coagulopathy coagulopathic coagulation central nervous system neurology neurological neurosurgery neurosurgical neuropathy neuropathology neuropathological brain cranium cranial intracranial cerebrum cerebellum cerebral intracerebral craniocerebral subdural epidural extradural arachnoid subarachnoid parenchymal intraparenchymal ventricular intraventricular meningeal meninges basilar artery cerebellar artery carotid artery communicating artery basal ganglia (continued next page) (continued from previous) basal ganglionic pontine putaminal spine spinal intraspinal paraspinal cauda equina vertebral vertebrae lumbar Supplementary Table S3. Inclusion and exclusion criteria used for manual literature screen. Inclusion criteria for manual screening of literature search 1 Plasma was administered to patients to prevent or treat bleeding or coagulopathy associated with the CNS 2 Plasma transfusion was a possible treatment option, even if plasma was not given or if alternative therapy was administered instead (to prevent or treat bleeding or coagulopathy associated with the CNS) 3 Efficacy, safety, or clinical and long-term outcomes (such as controlling bleeding, survival, recovery of functional independence, quality of life, and overall healthcare costs) were reported after plasma transfusion or equivalent therapy. Exclusion criteria for manual screening of literature search 1 “Not CNS-related”—bleeding or coagulopathy reported in the study was not associated with the CNS 2 “No outcomes of interest”—outcomes were not reported following plasma transfusion or equivalent therapy, or plasma transfusion was reported as an outcome rather than an intervention (e.g. transfusion requirements following different surgical approaches) 3 “Pediatrics”—study population consisted mainly of patients below 18 years of age 4 “Non-analytical reports”— Studies of limited statistical value; case reports and case series with ≤ 6 patients, where patients are presented case-by-case rather than being analyzed as a group 5 “Other studies”—animal model studies, in vitro or ex vivo experimental studies, non-systematic review articles, editorials, letters and opinion-based articles were all excluded CNS, central nervous system Supplementary Table S4. Evidence list for each clinical scenario Level of evidence Article Clinical scenario 1: Spontaneous bleeding with oral VKA therapy Original research articles 1+ Boulis et al., 1999 Neurosurgery.[1] 2+ Guest et al., 2010 Clin Ther.[2] 2+ Bershad et al., 2008 J Neurosurg.[3] 2+ Goldstein et al., 2006 Stroke.[4] 2+ Huttner et al., 2006 Stroke.[5] 2+ Roitberg et al., 2005 Neurosurgery.[6] 2+ Cartmill et al., 2000 Br J Neurosurg.[7] 2+ Makris et al., 1997 Thromb Haemost.[8] 2+ Fredriksson et al., 1992 Stroke.[9] 2- Stead et al., 2010 Clin Neurol Neurosurg.[10] 2- Siddiq et al., 2008 Neurocrit Care.[11] 2- Brody et al., 2005 Neurocrit Care.[12] 2- Yasaka et al., 2003 Thromb Haemost.[13] 3 Maeda et al., 2012 J Neurol Sci.[14] 3 Appelboam and Thomas 2007 Intensive Care Med.[15] 3 Bobbitt et al., 2011 Thromb Res.[16] 3 Barillari et al., 2012 Blood Transfus.[17] 3 Menzin et al., 2012 J Thromb Haemost.[18] 3 Ouirke et la., 2007 Ir Med J.[19] 3 Sjöblom et al., 2001 Stroke.[20] 3 Bertram et al., 2000 J Neurol.[21] 3 Wijdicks et al., 1998 Neurosurgery.[22] 3 Amin et al., 2012 Neurocrit Care.[23] 3 Menzin et al., 2012 Thromb Haemost.[24] 3 Chong et al., 2010 Anaesth Intensive Care.[25] 3 Fernlöf et al., 2009 Blood Coagul Fibrinolysis.[26] 3 Lee et al., 2006 Neurology.[27] 3 Park et al., 2003 Neurosurgery.[28] 3 Sørensen et al., 2003 Blood Coagul Fibrinolysis.[29] 3 Ananthasubramaniam et al, 2001 Chest.[30] 3 Pindur and Mörsdorf 1999 Thromb Res.[31] 3 Pindur et al., 1999 Semin Thromb Hemost.[32] 3 Zingale et al., 1999 J Neurosurg Sci.[33] Systematic reviews, meta-analyses, guidelines 1++ Stanworth et al., 2004 Br J Haematol.[34] 2++ Bechtel et al., 2011 Int J Emerg Med.[35] 2++ Dentali et al., 2011 Thromb Haemost.[36] 2++ Keeling et al., 2011 Br J Haematol.[37] 2++ Morgenstern et al., 2010 Stroke.[38] 2++ Murad et al., 2010 Transfusion.[39] 2++ Roback et al., 2010 Transfusion.[40] Clinical scenario 2: Spontaneous bleeding in the absence of oral VKA therapy Original research articles 2+ Bershad et al., 2008 J Neurosurg.[3] 2+ Roitberg et al., 2005 Neurosurgery.[6] 2- Stead et al., 2010 Clin Neurol Neurosurg.[10] 3 Pindur and Mörsdorf 1999 Thromb Res.[31] Systematic reviews, meta-analyses, guidelines 1++ Stanworth et al., 2004 Br J Haematol.[34] 2++ Morgenstern et al., 2010 Stroke.[38] 2++ Murad et al., 2010 Transfusion.[39] 2++ Roback et al., 2010 Transfusion.[40] Clinical scenario 3: Isolated trauma-related CNS bleeding with oral VKA therapy Original research articles 1+ Boulis et al., 1999 Neurosurgery.[1] 2++ Ivascu et al., 2005 J Trauma.[41] 2+ Guest et al., 2010 Clin Ther.[2] 2+ Bershad et al., 2008 J Neurosurg.[3] 2+ Makris et al., 1997 Thromb Haemost.[8] 2- Senft et al., 2009 Neurol Res.[42] 2- Stein et al., 2009 J Trauma.[43] 2- Kalina et al., 2008 Am Surg.[44] 3 Coimbra et al., 2005 J Trauma.[45] 3 Barillari et al., 2012 Blood Transfus.[17] 3 Menzin et al., 2012 J Thromb Haemost.[18] 3 Mountain et al., 2010 Med J Aust.[46] 3 Safaoui et al., 2009 Am J Surg.[47] 3 Wijdicks et al., 1998 Neurosurgery.[22] 3 Amin et al., 2012 Neurocrit Care.[23] 3 Menzin et al., 2012 Thromb Haemost.[24] Systematic reviews, meta-analyses, guidelines 1++ Stanworth et al., 2004 Br J Haematol.[34] 2++ Bechtel et al., 2011 Int J Emerg Med.[35] 2++ Dentali et al., 2011 Thromb Haemost.[36] 2++ Keeling et al., 2011 Br J Haematol.[37] 2++ Murad et al., 2010 Transfusion.[39] 2++ Roback et al., 2010 Transfusion.[40] Clinical scenario 4: Isolated trauma-related CNS bleeding in the absence of oral VKA therapy Original research articles 1+ Etemadrezaie et al., 2007 Clin Neurol Neurosurg.[48] 2++ Peiniger et al., 2011 Crit Care.[49] 2+ Bershad et al., 2008 J Neurosurg.[3] 2+ Winter et al., 1989 Ann Emerg Med.[50] 2- Stein et al., 2009 J Trauma.[43] 3 Schöchl et al., 2010 Crit Care.[51] 3 May et al., 1997 Am Surg.[52] 3 Touho et al., 1986 Neurosurgery.[53] 3 Bauer et al., 2011 J Trauma.[54] 3 Park et al., 2003 Neurosurgery.[28] Systematic reviews, meta-analyses, guidelines 1++ Stanworth et al., 2004 Br J Haematol.[34] 2++ Murad et al., 2010 Transfusion.[39] 2++ Roback et al., 2010 Transfusion.[40] 2+ Lier et al., 2011 Intensive Care Med.[55] Clinical scenario 5: Surgical bleeding with oral VKA therapy Original research articles 2+ Bershad et al., 2008 J Neurosurg.[3] 2+ Horlocker et al., 2001 Anesth Analg.[56] 3 Amin et al., 2012 Neurocrit Care.[23] Systematic reviews, meta-analyses, guidelines 1++ Stanworth et al., 2004 Br J Haematol.[34] 2++ Dentali et al., 2011 Thromb Haemost.[36] 2++ Keeling et al., 2011 Br J Haematol.[37] 2++ Murad et al., 2010 Transfusion.[39] 2++ Roback et al., 2010 Transfusion.[40] Clinical scenario 6: Surgical bleeding in the absence of oral VKA therapy Original research articles 1+ Xu et al., 2012 Arch Orthop Trauma Surg.[57] 2+ Bershad et al., 2008 J Neurosurg.[3] 2+ Horlocker et al., 2001 Anesth Analg.[56] 2- Friedman and Sussman 1989 Clin Lab Haematol.[58] 3 Watson et al., 2011 Transfus Med.[59] 3 Pull ter Gunne et al., 2010 Spine J.[60] 3 Blanchette et al., 2007 Eur Spine J.[61] 3 Davis et al., 2004 J Trauma.[62] 3 Bauer et al., 2011 J Trauma.[54] 3 Goldstein et al., 2010 Arch Neurol.[63] 3 Park et al., 2003 Neurosurgery.[28] Systematic reviews, meta-analyses, guidelines 1++ Stanworth et al., 2004 Br J Haematol.[34] 2++ Krisl et al., 2011 Ann Pharmacother.[64] 2++ Murad et al., 2010 Transfusion.[39] 2++ Roback et al., 2010 Transfusion.[40] Clinical scenario 7: Prophylactic transfusion of plasma in patients on oral VKA therapy1 Original research articles 1+ Yiu et al., 2006 Am J Cardiol.[65] 2- Stein et al., 2009 J Trauma.[43] 3 Bobbitt et al., 2011 Thromb Res.[16] 3 Ouirke et al., Ir Med J.[19] Systematic reviews, meta-analyses, guidelines 1++ Stanworth et al., 2004 Br J Haematol.[34] 2++ Dentali et al., 2011 Thromb Haemost.[36] 2++ Keeling et al., 2011 Br J Haematol.[37] 2++ Murad et al., 2010 Transfusion.[39] 2++ Roback et al., 2010 Transfusion.[40] Clinical scenario 8: Prophylactic transfusion of plasma in patients in the absence of oral VKA therapy1 Original research articles 1+ Etemadrezaie et al., 2007 Clin Neurol Neurosurg.[48] 2+ Winter et al., 1989 Ann Emerg Med.[50] 2- Stein et al., 2009 J Trauma.[43] 3 Watson et al., 2011 Transfus med.[59] 3 Davis et al., 2004 J Trauma.[62] 3 May et al., 1997 Am Surg.[52] 3 Touho et al., 1986 Neurosurgery.[53] Systematic reviews, meta-analyses, guidelines 1++ Stanworth et al., 2004 Br J Haematol.[34] 2++ Murad et al., 2010 Transfusion.[39] 2++ Roback et al., 2010 Transfusion.[40] 1 Prophylaxis was defined as administration of plasma in non-bleeding patients, either to normalize abnormal coagulation parameters, or as early intervention to reduce the risk of bleeding before invasive procedures or following injury. 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