Effect of Aspirin, Hemodilution and Desmopressin on Platelet Dysfunction
NCT ID: NCT01382134
Last Updated: 2013-11-15
Study Results
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Basic Information
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COMPLETED
NA
60 participants
INTERVENTIONAL
2011-07-31
2013-09-30
Brief Summary
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Mild hypothermia (34-35oC) is known to cause platelet dysfunction. This could lead to increased surgical bleeding and increased transfusion requirement during surgery. Although this hypothermia-induced platelet dysfunction seems to be reversible with warming, this is not always possible or desirable.
Desmopressin (DDAVP) is a drug which has proven efficacy in improving platelet function in uraemic and cirrhosis patients, and in reducing blood loss in selected surgeries. In a recent study, we have found that subcutaneous injection of 1.5 mcg (1/10th the usual dose) is already sufficient to fully reverse the platelet dysfunction seen at 32oC. We have demonstrated in another study that prolongation of the bleeding time in a 20% hemodiluted sample predicts increased postoperative bleeding after total knee replacement.
We have therefore designed this study as a follow up to our last two studies on DDAVP and hypothermia, to investigate whether hemodilution affects hypothermia induced platelet dysfunction and the response to DDAVP. In addition, another common cause of perioperative platelet dysfunction is the intake of COX inhibitors, particularly aspirin by patients. Therefor the effect of aspirin on hypothermia induced platelet dysfunction and the response to DDAVP, will also be investigated.
Detailed Description
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Although this hypothermia-induced platelet dysfunction seems to be reversible with warming, warming is not always possible or desirable. During major trauma or burn surgery, surface warming of patient is practically difficult. During surgeries with major blood loss and fluid shift, heat loss usually occurs at a rate that is more rapid than any warming device can catch up with. During neurosurgery, cooling may be beneficial to neurological outcome.
Desmopressin (DDAVP) is a drug which has proven efficacy in improving platelet function in uraemic and cirrhosis patients, and in reducing blood loss in selected surgeries. In a previous in vitro study, we have found that desmopressin significantly improves platelet function at 32oC. The improvement is seen with a very low concentration of desmopressin in vitro, which suggests that probably doses much smaller than the "standard dose" (15 mcg slow iv or subcutaneous) may be useful. In keeping with this in vitro study, in a more recent study, we have found that subcutaneous injection of 1.5 mcg (1/10th the usual dose) is already sufficient to fully reverse the platelet dysfunction seen at 32oC.
One of the limitations of our previous two studies is that the degree of platelet dysfuction observed at 32oC is relatively mild, with only around 20% prolongation of the closure times on the PFA-100® platelet function analyser. The clinical significance of such prolongation remains uncertain. However, we have demonstrated previously in another study that prolongation of the closure time to \>188 sec in a 20% hemodiluted sample predicts increased postoperative bleeding after total knee replacement. We have therefore designed this study as a follow up to our last two studies on DDAVP and hypothermia, to investigate whether hemodilution affects hypothermia induced platelet dysfunction and the response to DDAVP.
In addition, another common cause of perioperative platelet dysfunction is the intake of COX inhibitors, particularly aspirin by patients. Therefor the effect of aspirin on hypothermia induced platelet dysfunction and the response to DDAVP, will also be investigated.
Conditions
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Keywords
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Study Design
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RANDOMIZED
PARALLEL
TREATMENT
TRIPLE
Study Groups
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Placebo group
Subjects will be given placebo daily for 3 days. On day 4 an early morning urine sample will be collected for detection of aspirin metabolite (11-dehydro thromboxane B2). On day 6 venous blood sample will be collected, 17mls before and 17 mls after injection of DDAVP 15 microgram subcutaneously. The blood samples will then be subjected for platelet function analysis.
Placebo, desmopressin
Placebo 1 tab daily for 3 days Desmopressin 15 microgram subcutaneously once only
Aspirin group
Subjects will be given aspirin 100mg daily for 3 days. On day 4 an early morning urine sample will be collected for detection of aspirin metabolite (11-dehydro thromboxane B2). On day 6 venous blood sample will be collected, 17mls before and 17 mls after injection of DDAVP 15microgram subcutaneously. The blood samples will then be subjected for platelet function analysis.
Aspirin, desmopressin
Aspirin 100mg daily for 3 days Desmopressin 15 microgram subcutaneously once only
Interventions
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Aspirin, desmopressin
Aspirin 100mg daily for 3 days Desmopressin 15 microgram subcutaneously once only
Placebo, desmopressin
Placebo 1 tab daily for 3 days Desmopressin 15 microgram subcutaneously once only
Eligibility Criteria
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Inclusion Criteria
Exclusion Criteria
2. Expected surgical operation or dental treatment within one week of scheduled drug intake.
3. Known peptic ulcer disease
4. Obesity (BMI \>=30)
5. Pregnant or lactating women.
6. Known chronic liver or renal disease.
7. Coronary artery, carotid artery or peripheral artery disease
8. Recent history of taking antiplatelet drugs, anticoagulants or herbal preparations.
9. Smoker or alcohol user
10. Mentally incapable of providing informed consent
11. Students or junior staff members who had direct working relationship with the PI
18 Years
60 Years
ALL
Yes
Sponsors
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The University of Hong Kong
OTHER
Responsible Party
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Tsui Pui Yee
Dr TSUI Pui Yee
Locations
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Queen Mary Hospital
Hong Kong, , China
Countries
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References
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Wolberg AS, Meng ZH, Monroe DM 3rd, Hoffman M. A systematic evaluation of the effect of temperature on coagulation enzyme activity and platelet function. J Trauma. 2004 Jun;56(6):1221-8. doi: 10.1097/01.ta.0000064328.97941.fc.
Cavallini M, Baruffaldi Preis FW, Casati A. Effects of mild hypothermia on blood coagulation in patients undergoing elective plastic surgery. Plast Reconstr Surg. 2005 Jul;116(1):316-21; discussion 322-3. doi: 10.1097/01.prs.0000170798.45679.7a.
Michelson AD, Barnard MR, Khuri SF, Rohrer MJ, MacGregor H, Valeri CR. The effects of aspirin and hypothermia on platelet function in vivo. Br J Haematol. 1999 Jan;104(1):64-8. doi: 10.1046/j.1365-2141.1999.01146.x.
Hofer CK, Worn M, Tavakoli R, Sander L, Maloigne M, Klaghofer R, Zollinger A. Influence of body core temperature on blood loss and transfusion requirements during off-pump coronary artery bypass grafting: a comparison of 3 warming systems. J Thorac Cardiovasc Surg. 2005 Apr;129(4):838-43. doi: 10.1016/j.jtcvs.2004.07.002.
Schmied H, Kurz A, Sessler DI, Kozek S, Reiter A. Mild hypothermia increases blood loss and transfusion requirements during total hip arthroplasty. Lancet. 1996 Feb 3;347(8997):289-92. doi: 10.1016/s0140-6736(96)90466-3.
Winkler M, Akca O, Birkenberg B, Hetz H, Scheck T, Arkilic CF, Kabon B, Marker E, Grubl A, Czepan R, Greher M, Goll V, Gottsauner-Wolf F, Kurz A, Sessler DI. Aggressive warming reduces blood loss during hip arthroplasty. Anesth Analg. 2000 Oct;91(4):978-84. doi: 10.1097/00000539-200010000-00039.
Schmied H, Schiferer A, Sessler DI, Meznik C. The effects of red-cell scavenging, hemodilution, and active warming on allogenic blood requirements in patients undergoing hip or knee arthroplasty. Anesth Analg. 1998 Feb;86(2):387-91. doi: 10.1097/00000539-199802000-00032.
Todd MM, Hindman BJ, Clarke WR, Torner JC; Intraoperative Hypothermia for Aneurysm Surgery Trial (IHAST) Investigators. Mild intraoperative hypothermia during surgery for intracranial aneurysm. N Engl J Med. 2005 Jan 13;352(2):135-45. doi: 10.1056/NEJMoa040975.
Ying CL, Tsang SF, Ng KF. The potential use of desmopressin to correct hypothermia-induced impairment of primary haemostasis--an in vitro study using PFA-100. Resuscitation. 2008 Jan;76(1):129-33. doi: 10.1016/j.resuscitation.2007.07.009. Epub 2007 Aug 21.
Ng KF, Lawmin JC, Tsang SF, Tang WM, Chiu KY. Value of a single preoperative PFA-100 measurement in assessing the risk of bleeding in patients taking cyclooxygenase inhibitors and undergoing total knee replacement. Br J Anaesth. 2009 Jun;102(6):779-84. doi: 10.1093/bja/aep091. Epub 2009 May 2.
Gallinaro L, Cattini MG, Sztukowska M, Padrini R, Sartorello F, Pontara E, Bertomoro A, Daidone V, Pagnan A, Casonato A. A shorter von Willebrand factor survival in O blood group subjects explains how ABO determinants influence plasma von Willebrand factor. Blood. 2008 Apr 1;111(7):3540-5. doi: 10.1182/blood-2007-11-122945. Epub 2008 Feb 1.
Mannucci PM, Capoferri C, Canciani MT. Plasma levels of von Willebrand factor regulate ADAMTS-13, its major cleaving protease. Br J Haematol. 2004 Jul;126(2):213-8. doi: 10.1111/j.1365-2141.2004.05009.x.
Tsui PY, Cheung CW, Lee Y, Leung SW, Ng KF. The effectiveness of low-dose desmopressin in improving hypothermia-induced impairment of primary haemostasis under influence of aspirin - a randomized controlled trial. BMC Anesthesiol. 2015 May 28;15:80. doi: 10.1186/s12871-015-0061-5.
Other Identifiers
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UW 11-075
Identifier Type: -
Identifier Source: org_study_id