Subscribe to RSS
DOI: 10.1055/s-0040-1702918
Thrombocytopenia in Surgery and Neuraxial Anesthesia
Authors

Abstract
This is a review of the evidence for the use of different platelet count thresholds prior to invasive procedures and surgery. This review will focus on three procedures that are common in patients with thrombocytopenia—central venous catheter insertion, liver biopsy, and lumbar punctures and epidural catheters—as well as highlighting the lack of evidence for more major surgery. Tunneled or untunneled central venous catheters are low-risk procedures and can be safely performed without any intervention when the platelet count is 20 × 109/L or above. Evidence for their safety is more limited below this threshold, but as bleeding is easily treated, interventions should focus on treating any bleeding that occurs rather than preventative strategies. The available evidence for neuraxial anesthesia is based on very low-quality evidence from observational studies. Based on this evidence, the risk of an epidural hematoma is less than 0.19% (upper limit of 95% confidence interval) for pregnant women undergoing an epidural anesthetic when the platelet count is between 70 and 99 × 109/L. No randomized trials have been performed in children, nor have any randomized trials been performed in major or emergency surgeries.
Publication History
Publication Date:
07 April 2020 (online)
© 2020. Thieme. All rights reserved.
Thieme Medical Publishers, Inc.
333 Seventh Avenue, 18th Floor, New York, NY 10001, USA
-
References
- 1
Semple JW,
Italiano Jr JE,
Freedman J.
Platelets and the immune continuum. Nat Rev Immunol 2011; 11 (04) 264-274
Reference Ris Wihthout Link
- 2
British Committee for Standards in Haematology, Blood Transfusion Task Force.
Guidelines for the use of platelet transfusions. Br J Haematol 2003; 122 (01) 10-23
Reference Ris Wihthout Link
- 3
Gernsheimer T,
James AH,
Stasi R.
How I treat thrombocytopenia in pregnancy. Blood 2013; 121 (01) 38-47
Reference Ris Wihthout Link
- 4
Weinzierl EP,
Arber DA.
The differential diagnosis and bone marrow evaluation of new-onset pancytopenia. Am
J Clin Pathol 2013; 139 (01) 9-29
Reference Ris Wihthout Link
- 5
Levi M,
Toh CH,
Thachil J,
Watson HG.
British Committee for Standards in Haematology.
Guidelines for the diagnosis and management of disseminated intravascular coagulation.
Br J Haematol 2009; 145 (01) 24-33
Reference Ris Wihthout Link
- 6
Neunert C,
Lim W,
Crowther M,
Cohen A,
Solberg Jr L,
Crowther MA.
American Society of Hematology.
The American Society of Hematology 2011 evidence-based practice guideline for immune
thrombocytopenia. Blood 2011; 117 (16) 4190-4207
Reference Ris Wihthout Link
- 7
Cines DB,
Levine LD.
Thrombocytopenia in pregnancy. Blood 2017; 130 (21) 2271-2277
Reference Ris Wihthout Link
- 8
Hui P,
Cook DJ,
Lim W,
Fraser GA,
Arnold DM.
The frequency and clinical significance of thrombocytopenia complicating critical
illness: a systematic review. Chest 2011; 139 (02) 271-278
Reference Ris Wihthout Link
- 9
Afdhal N,
McHutchison J,
Brown R.
et al.
Thrombocytopenia associated with chronic liver disease. J Hepatol 2008; 48 (06) 1000-1007
Reference Ris Wihthout Link
- 10
Burrows RF,
Kelton JG.
Thrombocytopenia at delivery: a prospective survey of 6715 deliveries. Am J Obstet
Gynecol 1990; 162 (03) 731-734
Reference Ris Wihthout Link
- 11
Nisha S,
Amita D,
Uma S,
Tripathi AK,
Pushplata S.
Prevalence and characterization of thrombocytopenia in pregnancy in Indian women.
Indian J Hematol Blood Transfus 2012; 28 (02) 77-81
Reference Ris Wihthout Link
- 12
Sainio S,
Kekomäki R,
Riikonen S,
Teramo K.
Maternal thrombocytopenia at term: a population-based study. Acta Obstet Gynecol Scand
2000; 79 (09) 744-749
Reference Ris Wihthout Link
- 13
Stanworth SJ,
Walsh TS,
Prescott RJ,
Lee RJ,
Watson DM,
Wyncoll DL.
Intensive Care Study of Coagulopathy Investigators.
Thrombocytopenia and platelet transfusion in UK critical care: a multicenter observational
study. Transfusion 2013; 53 (05) 1050-1058
Reference Ris Wihthout Link
- 14
Pendry K,
Davies T.
An audit of the use and wastage in the North West of England and North Wales - where
have all the platelets gone?. Blood and Transfusion Matters 2011; 34: 17-19
Reference Ris Wihthout Link
- 15
Jones A,
Birchall J,
Roberts P.
et al.
A survey of where and why platelets are used in hospitals in the South West region
of England. Transfus Med 2013; 23 (Suppl. 02) PO34
Reference Ris Wihthout Link
- 16
NICE.
Blood transfusion. NICE guideline [NG24]. Accessed June 12, 2019 at: https://www.nice.org.uk/guidance/ng24
Reference Ris Wihthout Link
- 17
Kaufman RM,
Djulbegovic B,
Gernsheimer T.
et al;
AABB.
Platelet transfusion: a clinical practice guideline from the AABB. Ann Intern Med
2015; 162 (03) 205-213
Reference Ris Wihthout Link
- 18
Estcourt LJ,
Birchall J,
Allard S.
et al;
British Committee for Standards in Haematology.
Guidelines for the use of platelet transfusions. Br J Haematol 2017; 176 (03) 365-394
Reference Ris Wihthout Link
- 19
Foster PF,
Moore LR,
Sankary HN,
Hart ME,
Ashmann MK,
Williams JW.
Central venous catheterization in patients with coagulopathy. Arch Surg 1992; 127
(03) 273-275
Reference Ris Wihthout Link
- 20
Barrera R,
Mina B,
Huang Y,
Groeger JS.
Acute complications of central line placement in profoundly thrombocytopenic cancer
patients. Cancer 1996; 78 (09) 2025-2030
Reference Ris Wihthout Link
- 21
Doerfler ME,
Kaufman B,
Goldenberg AS.
Central venous catheter placement in patients with disorders of hemostasis. Chest
1996; 110 (01) 185-188
Reference Ris Wihthout Link
- 22
Ray Jr CE,
Shenoy SS.
Patients with thrombocytopenia: outcome of radiologic placement of central venous
access devices. Radiology 1997; 204 (01) 97-99
Reference Ris Wihthout Link
- 23
Fisher NC,
Mutimer DJ.
Central venous cannulation in patients with liver disease and coagulopathy--a prospective
audit. Intensive Care Med 1999; 25 (05) 481-485
Reference Ris Wihthout Link
- 24
Mumtaz H,
Williams V,
Hauer-Jensen M.
et al.
Central venous catheter placement in patients with disorders of hemostasis. Am J Surg
2000; 180 (06) 503-505 , discussion 506
Reference Ris Wihthout Link
- 25
Carr E,
Jayabose S,
Stringel G.
et al.
The safety of central line placement prior to treatment of pediatric acute lymphoblastic
leukemia. Pediatr Blood Cancer 2006; 47 (07) 886-888
Reference Ris Wihthout Link
- 26
Loh AH,
Chui CH.
Port-A-Cath insertions in acute leukemia: does thrombocytopenia affect morbidity?.
J Pediatr Surg 2007; 42 (07) 1180-1184
Reference Ris Wihthout Link
- 27
Tomoyose T,
Ohama M,
Yamanoha A,
Masuzaki H,
Okudaira T,
Tokumine J.
Real-time ultrasound-guided central venous catheterization reduces the need for prophylactic
platelet transfusion in thrombocytopenic patients with hematological malignancy. Transfus
Apheresis Sci 2013; 49 (02) 367-369
Reference Ris Wihthout Link
- 28
Tercan F,
Ozkan U,
Oguzkurt L.
US-guided placement of central vein catheters in patients with disorders of hemostasis.
Eur J Radiol 2008; 65 (02) 253-256
Reference Ris Wihthout Link
- 29
Della Vigna P,
Monfardini L,
Bonomo G.
et al.
Coagulation disorders in patients with cancer: nontunneled central venous catheter
placement with US guidance--a single-institution retrospective analysis. Radiology
2009; 253 (01) 249-252
Reference Ris Wihthout Link
- 30
Weigand K,
Encke J,
Meyer FJ.
et al.
Low levels of prothrombin time (INR) and platelets do not increase the risk of significant
bleeding when placing central venous catheters. Med Klin (Munich) 2009; 104 (05) 331-335
Reference Ris Wihthout Link
- 31
Cavanna L,
Civardi G,
Vallisa D.
et al.
Ultrasound-guided central venous catheterization in cancer patients improves the success
rate of cannulation and reduces mechanical complications: a prospective observational
study of 1,978 consecutive catheterizations. World J Surg Oncol 2010; 8: 91
Reference Ris Wihthout Link
- 32
Haas B,
Chittams JL,
Trerotola SO.
Large-bore tunneled central venous catheter insertion in patients with coagulopathy.
J Vasc Interv Radiol 2010; 21 (02) 212-217
Reference Ris Wihthout Link
- 33
Zeidler K,
Arn K,
Senn O,
Schanz U,
Stussi G.
Optimal preprocedural platelet transfusion threshold for central venous catheter insertions
in patients with thrombocytopenia. Transfusion 2011; 51 (11) 2269-2276
Reference Ris Wihthout Link
- 34
Napolitano M,
Malato A,
Raffaele F.
et al.
Ultrasonography-guided central venous catheterisation in haematological patients with
severe thrombocytopenia. Blood Transfus 2013; 11 (04) 506-509
Reference Ris Wihthout Link
- 35
Duffy SM,
Coyle TE.
Platelet transfusions and bleeding complications associated with plasma exchange catheter
placement in patients with presumed thrombotic thrombocytopenic purpura. J Clin Apher
2013; 28 (05) 356-358
Reference Ris Wihthout Link
- 36
van de Weerdt EK,
Biemond BJ,
Zeerleder SS,
van Lienden KP,
Binnekade JM,
Vlaar APJ.
Study collaborative.
Prophylactic platelet transfusion prior to central venous catheter placement in patients
with thrombocytopenia: study protocol for a randomised controlled trial. Trials 2018;
19 (01) 127
Reference Ris Wihthout Link
- 37
Rocha LL,
Pessoa CMS,
Neto AS.
et al;
POCKET Trial Investigators.
Thromboelastometry versus standard coagulation tests versus restrictive protocol to
guide blood transfusion prior to central venous catheterization in cirrhosis: study
protocol for a randomized controlled trial. Trials 2017; 18 (01) 85
Reference Ris Wihthout Link
- 38
Potet J,
Thome A,
Curis E.
et al.
Peripherally inserted central catheter placement in cancer patients with profound
thrombocytopaenia: a prospective analysis. Eur Radiol 2013; 23 (07) 2042-2048
Reference Ris Wihthout Link
- 39
British Society of Gastroenterologists.
BSG guidelines on the use of liver biopsy in clinical practice. Accessed June 10,
2019 at: https://www.bsg.org.uk/resource/bsg-guidelines-on-the-use-of-liver-biopsy-in-clinical-practice.html
Reference Ris Wihthout Link
- 40
Rockey DC,
Caldwell SH,
Goodman ZD,
Nelson RC,
Smith AD.
American Association for the Study of Liver Diseases.
Liver biopsy. Hepatology 2009; 49 (03) 1017-1044
Reference Ris Wihthout Link
- 41
Kitchin DR,
Del Rio AM,
Woods M,
Ludeman L,
Hinshaw JL.
Percutaneous liver biopsy and revised coagulation guidelines: a 9-year experience.
Abdom Radiol (NY) 2018; 43 (06) 1494-1501
Reference Ris Wihthout Link
- 42
Midia M,
Odedra D,
Shuster A,
Midia R,
Muir J.
Predictors of bleeding complications following percutaneous image-guided liver biopsy:
a scoping review. Diagn Interv Radiol 2019; 25 (01) 71-80
Reference Ris Wihthout Link
- 43
Seeff LB,
Everson GT,
Morgan TR.
et al;
HALT–C Trial Group.
Complication rate of percutaneous liver biopsies among persons with advanced chronic
liver disease in the HALT-C trial. Clin Gastroenterol Hepatol 2010; 8 (10) 877-883
Reference Ris Wihthout Link
- 44
Napolitano G,
Iacobellis A,
Merla A.
et al.
Bleeding after invasive procedures is rare and unpredicted by platelet counts in cirrhotic
patients with thrombocytopenia. Eur J Intern Med 2017; 38: 79-82
Reference Ris Wihthout Link
- 45
Kalambokis G,
Manousou P,
Vibhakorn S.
et al.
Transjugular liver biopsy--indications, adequacy, quality of specimens, and complications--a
systematic review. J Hepatol 2007; 47 (02) 284-294
Reference Ris Wihthout Link
- 46
Mammen T,
Keshava SN,
Eapen CE.
et al.
Transjugular liver biopsy: a retrospective analysis of 601 cases. J Vasc Interv Radiol
2008; 19 (03) 351-358
Reference Ris Wihthout Link
- 47
Wallace MJ,
Narvios A,
Lichtiger B.
et al.
Transjugular liver biopsy in patients with hematologic malignancy and severe thrombocytopenia.
J Vasc Interv Radiol 2003; 14 (03) 323-327
Reference Ris Wihthout Link
- 48
Basu P,
Nair T,
Farhat S,
Shah NJ,
Krishnaswamy N.
Single use of romiplostim thrombopoietin analogue in thrombocytopenia for liver biopsy
in chronic liver disease-randomized clinical trial. J Gastroenterol Hepatol 2012;
27 (Suppl. 05) 207-208
Reference Ris Wihthout Link
- 49
Estcourt LJ,
Malouf R,
Hopewell S,
Doree C,
Van Veen J.
Use of platelet transfusions prior to lumbar punctures or epidural anaesthesia for
the prevention of complications in people with thrombocytopenia. Cochrane Database
Syst Rev 2018; 4 (04) CD011980
Reference Ris Wihthout Link
- 50
Lee LO,
Bateman BT,
Kheterpal S.
et al;
Multicenter Perioperative Outcomes Group Investigators.
Risk of epidural hematoma after neuraxial techniques in thrombocytopenic parturients:
a report from the Multicenter Perioperative Outcomes Group. Anesthesiology 2017; 126
(06) 1053-1063
Reference Ris Wihthout Link
- 51
Levy N,
Goren O,
Cattan A,
Weiniger CF,
Matot I.
Neuraxial block for delivery among women with low platelet counts: a retrospective
analysis. Int J Obstet Anesth 2018; 35: 4-9
Reference Ris Wihthout Link
- 52
Mainwaring C,
Natarajan A,
Peckham C,
Readett D,
Singhal R,
Vazzalwar R.
et al.
Untreated thrombocytopenia and lumbar puncture-related bleeding risk at diagnosis
of childhood acute lymphoblastic leukemia (ALL). Presented at the Conference of the
British Society for Haematology, April 27–30, 1998, Glasgow, Scotland
Reference Ris Wihthout Link
- 53
Howard SC,
Gajjar A,
Ribeiro RC.
et al.
Safety of lumbar puncture for children with acute lymphoblastic leukemia and thrombocytopenia.
JAMA 2000; 284 (17) 2222-2224
Reference Ris Wihthout Link
- 54
Howard SC,
Gajjar AJ,
Cheng C.
et al.
Risk factors for traumatic and bloody lumbar puncture in children with acute lymphoblastic
leukemia. JAMA 2002; 288 (16) 2001-2007
Reference Ris Wihthout Link
- 55
Feusner J.
Platelet transfusion “trigger” for lumbar puncture. Pediatr Blood Cancer 2004; 43
(07) 793
Reference Ris Wihthout Link
- 56
Veen JJ,
Vora AJ,
Welch JC.
Lumbar puncture in thrombocytopenic children. Br J Haematol 2004; 127 (02) 233-234
, author reply 234–235
Reference Ris Wihthout Link
- 57
Ruell J,
Karuvattil R,
Wynn R,
Will A.
Platelet count has no influence on traumatic and bloody lumbar puncture in children
undergoing intrathecal chemotherapy. Br J Haematol 2007; 136 (02) 347-348
Reference Ris Wihthout Link
- 58
Kitanovski L,
Trampus-Bakija A,
Benedik-Dolnicar M.
Prophylactic platelet transfusions before lumbar puncture. Zdrav Vestn 2008; 77: 111-115
Reference Ris Wihthout Link
- 59
Foerster MV,
Pedrosa FP,
da Fonseca TC,
Couceiro TC,
Lima LC.
Lumbar punctures in thrombocytopenic children with cancer. Paediatr Anaesth 2015;
25 (02) 206-210
Reference Ris Wihthout Link
- 60
Vigil-De Gracia P,
Silva S,
Montufar C,
Carrol I,
De Los Rios S.
Anesthesia in pregnant women with HELLP syndrome. Int J Gynaecol Obstet 2001; 74 (01)
23-27
Reference Ris Wihthout Link
- 61
Vavricka SR,
Walter RB,
Irani S,
Halter J,
Schanz U.
Safety of lumbar puncture for adults with acute leukemia and restrictive prophylactic
platelet transfusion. Ann Hematol 2003; 82 (09) 570-573
Reference Ris Wihthout Link
- 62
Frenk V,
Camann W,
Shankar KB.
Regional anesthesia in parturients with low platelet counts. Can J Anaesth 2005; 52
(01) 114
Reference Ris Wihthout Link
- 63
Palit S,
Palit G,
Vercauteren M,
Jacquemyn Y.
Regional anaesthesia for primary caesarean section in patients with preterm HELLP
syndrome: a review of 102 cases. Clin Exp Obstet Gynecol 2009; 36 (04) 230-234
Reference Ris Wihthout Link
- 64
Tanaka M,
Balki M,
McLeod A,
Carvalho JC.
Regional anesthesia and non-preeclamptic thrombocytopenia: time to re-think the safe
platelet count. Rev Bras Anestesiol 2009; 59 (02) 142-153
Reference Ris Wihthout Link
- 65
Goodier CG,
Lu JT,
Hebbar L,
Segal BS,
Goetzl L.
Neuraxial anesthesia in parturients with thrombocytopenia: a multisite retrospective
cohort study. Anesth Analg 2015; 121 (04) 988-991
Reference Ris Wihthout Link
- 66
Bernstein J,
Hua B,
Kahana M,
Shaparin N,
Yu S,
Davila-Velazquez J.
Neuraxial anesthesia in parturients with low platelet counts. Anesth Analg 2016; 123
(01) 165-167
Reference Ris Wihthout Link
- 67
Eypasch E,
Lefering R,
Kum CK,
Troidl H.
Probability of adverse events that have not yet occurred: a statistical reminder.
BMJ 1995; 311 (7005): 619-620
Reference Ris Wihthout Link
- 68
Hanley JA,
Lippman-Hand A.
If nothing goes wrong, is everything all right? Interpreting zero numerators. JAMA
1983; 249 (13) 1743-1745
Reference Ris Wihthout Link
- 69
Rolbin SH,
Abbott D,
Musclow E,
Papsin F,
Lie LM,
Freedman J.
Epidural anesthesia in pregnant patients with low platelet counts. Obstet Gynecol
1988; 71 (6 Pt 1): 918-920
Reference Ris Wihthout Link
- 70
Rasmus KT,
Rottman RL,
Kotelko DM,
Wright WC,
Stone JJ,
Rosenblatt RM.
Unrecognized thrombocytopenia and regional anesthesia in parturients: a retrospective
review. Obstet Gynecol 1989; 73 (06) 943-946
Reference Ris Wihthout Link
- 71
Shalev O,
Anteby E.
Epidural anesthesia can be safely performed in gestational thrombocytopenia of > 50,000/mL.
Blood 1996; 88 (Supp): 62b
Reference Ris Wihthout Link
- 72
Beilin Y,
Zahn J,
Comerford M.
Safe epidural analgesia in thirty parturients with platelet counts between 69,000
and 98,000 mm(-3). Anesth Analg 1997; 85 (02) 385-388
Reference Ris Wihthout Link
- 73
Sharma SK,
Philip J,
Whitten CW,
Padakandla UB,
Landers DF.
Assessment of changes in coagulation in parturients with preeclampsia using thromboelastography.
Anesthesiology 1999; 90 (02) 385-390
Reference Ris Wihthout Link
- 74
Webert KE,
Mittal R,
Sigouin C,
Heddle NM,
Kelton JG.
A retrospective 11-year analysis of obstetric patients with idiopathic thrombocytopenic
purpura. Blood 2003; 102 (13) 4306-4311
Reference Ris Wihthout Link
- 75
Beilin Y,
Arnold I,
Hossain S.
Evaluation of the platelet function analyzer (PFA-100) vs. the thromboelastogram (TEG)
in the parturient. Int J Obstet Anesth 2006; 15 (01) 7-12
Reference Ris Wihthout Link
- 76
New HV,
Berryman J,
Bolton-Maggs PHB.
et al;
British Committee for Standards in Haematology.
Guidelines on transfusion for fetuses, neonates and older children. Br J Haematol
2016; 175 (05) 784-828
Reference Ris Wihthout Link
- 77
Estcourt LJ,
Malouf R,
Doree C,
Trivella M,
Hopewell S,
Birchall J.
Prophylactic platelet transfusions prior to surgery for people with a low platelet
count. Cochrane Database Syst Rev 2018; 9 (09) CD012779
Reference Ris Wihthout Link
- 78
Stanca CM,
Montazem AH,
Lawal A,
Zhang JX,
Schiano TD.
Intranasal desmopressin versus blood transfusion in cirrhotic patients with coagulopathy
undergoing dental extraction: a randomized controlled trial. J Oral Maxillofac Surg
2010; 68 (01) 138-143
Reference Ris Wihthout Link
- 79
Veelo DP,
Vlaar AP,
Dongelmans DA.
et al.
Correction of subclinical coagulation disorders before percutaneous dilatational tracheotomy.
Blood Transfus 2012; 10 (02) 213-220
Reference Ris Wihthout Link
- 80
De Pietri L,
Bianchini M,
Montalti R.
et al.
Thrombelastography-guided blood product use before invasive procedures in cirrhosis
with severe coagulopathy: a randomized, controlled trial. Hepatology 2016; 63 (02)
566-573
Reference Ris Wihthout Link
- 81
Fillmore WJ,
Leavitt BD,
Arce K.
Dental extraction in the thrombocytopenic patient is safe and complications are easily
managed. J Oral Maxillofac Surg 2013; 71 (10) 1647-1652
Reference Ris Wihthout Link
- 82
Perdigão JPV,
de Almeida PC,
Rocha TDS.
et al.
Postoperative bleeding after dental extraction in liver pretransplant patients. J
Oral Maxillofac Surg 2012; 70 (03) e177-e184
Reference Ris Wihthout Link
- 83
Nuvvula S,
Gaddam KR,
Kamatham R.
Efficacy of tranexamic acid mouthwash as an alternative for factor replacement in
gingival bleeding during dental scaling in cases of hemophilia: a randomized clinical
trial. Contemp Clin Dent 2014; 5 (01) 49-53
Reference Ris Wihthout Link
- 84
Lee AP,
Boyle CA,
Savidge GF,
Fiske J.
Effectiveness in controlling haemorrhage after dental scaling in people with haemophilia
by using tranexamic acid mouthwash. Br Dent J 2005; 198 (01) 33-38 , discussion 26
Reference Ris Wihthout Link
- 85
Afdhal NH,
Giannini EG,
Tayyab G.
et al;
ELEVATE Study Group.
Eltrombopag before procedures in patients with cirrhosis and thrombocytopenia. N Engl
J Med 2012; 367 (08) 716-724
Reference Ris Wihthout Link
- 86
Miller JB,
Figueroa EJ,
Haug RM,
Shah NL.
Thrombocytopenia in chronic liver disease and the role of thrombopoietin agonists.
Gastroenterol Hepatol (N Y) 2019; 15 (06) 326-332
Reference Ris Wihthout Link
- 87
Curley A,
Stanworth SJ,
Willoughby K.
et al;
PlaNeT2 MATISSE Collaborators.
Randomized trial of platelet-transfusion thresholds in neonates. N Engl J Med 2019;
380 (03) 242-251
Reference Ris Wihthout Link
- 88
Lye DC,
Archuleta S,
Syed-Omar SF.
et al.
Prophylactic platelet transfusion plus supportive care versus supportive care alone
in adults with dengue and thrombocytopenia: a multicentre, open-label, randomised,
superiority trial. Lancet 2017; 389 (10079): 1611-1618
Reference Ris Wihthout Link
- 89
Baharoglu MI,
Cordonnier C,
Salman RA-S.
et al;
PATCH Investigators.
Platelet transfusion versus standard care after acute stroke due to spontaneous cerebral
haemorrhage associated with antiplatelet therapy (PATCH): a randomised, open-label,
phase 3 trial. Lancet 2016; 387 (10038): 2605-2613
Reference Ris Wihthout Link