- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01382134
Effect of Aspirin, Hemodilution and Desmopressin on Platelet Dysfunction
Effect of Aspirin, in Vitro Hemodilution and Desmopressin on Platelet Dysfunction Associated With Mild Hypothermia in Healthy Volunteers
Study hypothesis: Desmopressin (DDAVP) can improve platelet function under influence of aspirin, hemodilution and mild hypothermia
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.
Study Overview
Status
Intervention / Treatment
Detailed Description
Mild hypothermia (34-35oC) is known to cause platelet dysfunction. Increased surgical bleeding and increased transfusion requirement at this temperature range has been reported in both cardiac and noncardiac surgeries. This degree of hypothermia is common during any general anaesthesia, particularly during surgeries which invlove major fluid shift and large area exposure of patients, e.g. trauma and burn patients.
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.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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Hong Kong, China
- Queen Mary Hospital
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- 60 adult Chinese subjects aged 18-60 without known platelet disorder, thrombocytopenia, history of taking drugs that may affect platelet function including herbal preparations.
Exclusion Criteria:
- Any known platelet or coagulation disorder
- Expected surgical operation or dental treatment within one week of scheduled drug intake.
- Known peptic ulcer disease
- Obesity (BMI >=30)
- Pregnant or lactating women.
- Known chronic liver or renal disease.
- Coronary artery, carotid artery or peripheral artery disease
- Recent history of taking antiplatelet drugs, anticoagulants or herbal preparations.
- Smoker or alcohol user
- Mentally incapable of providing informed consent
- Students or junior staff members who had direct working relationship with the PI
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Triple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
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Placebo Comparator: 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.
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Placebo 1 tab daily for 3 days Desmopressin 15 microgram subcutaneously once only
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Active Comparator: 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.
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Aspirin 100mg daily for 3 days Desmopressin 15 microgram subcutaneously once only
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Platelet function
Time Frame: Day 6 after aspirin intake
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Venous blood sample will be taken from subjects before and after injection of DDAVP.
Blood sample will be subjected to: (i) complete blood count, (ii) PFA-100 platelet function analyzer, (iii) fibrinogen, and (iv) vWF:Ag concentration for analysis.
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Day 6 after aspirin intake
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Collaborators and Investigators
Sponsor
Publications and helpful links
General Publications
- 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.
- 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.
- 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.
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Hematologic Diseases
- Body Temperature Changes
- Hypothermia
- Blood Platelet Disorders
- Physiological Effects of Drugs
- Molecular Mechanisms of Pharmacological Action
- Peripheral Nervous System Agents
- Enzyme Inhibitors
- Analgesics
- Sensory System Agents
- Anti-Inflammatory Agents, Non-Steroidal
- Analgesics, Non-Narcotic
- Anti-Inflammatory Agents
- Antirheumatic Agents
- Fibrinolytic Agents
- Fibrin Modulating Agents
- Platelet Aggregation Inhibitors
- Cyclooxygenase Inhibitors
- Antipyretics
- Natriuretic Agents
- Hemostatics
- Coagulants
- Antidiuretic Agents
- Aspirin
- Deamino Arginine Vasopressin
Other Study ID Numbers
- UW 11-075
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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