Clinical trial NCT03121898: PLATelet Function Operating Room Monitoring
Official title: PLATelet Function Operating Room Monitoring
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Platelet Dysfunction Due to Drugs
Bleeding
Lead sponsor: IRCCS Policlinico S. Donato
Sponsor class: OTHER
First posted: 2017-04-20
Enrollment: 490
Sex: ALL
Minimum age (years): 18
Maximum age (years): 95
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Adult cardiac surgery patients

Brief summary: Prospective cohort study on adult cardiac surgery patients. Platelet function evaluated before and after cardiopulmonary bypass. Bleeding and transfusion recorded. Primary endpoint is finding the association between postoperative platelet function and bleeding.

Detailed description: Preoperative platelet function is a known determinant of postoperative bleeding in cardiac surgery patients (1,2). Conversely, there is a lack of information with respect to postoperative platelet function and postoperative bleeding, and specific cut-off values have not been identified yet.

This study will verify the hypothesis that postoperative platelet function is associated with bleeding, and will test the ability of platelet function tests (PFTs) in predicting severe postoperative bleeding. Additional analyses linking platelet function to other preoperative and intraoperative conditions are planned.

Patients: Enrollment between February 2017 and January 2018. 800 consecutive adult cardiac surgery patients are considered based on our usual surgical activity. Exclusion criteria: unwillingness to participate, known congenital coagulopathy. Moderate/severe bleeding occurs in about 12% of our patient population. Considering a 15% dropout rate, there are about 80 predicted events. Power analysis: to build a predictive model, at least 60 events of moderate/severe bleeding are required. The study will be stopped at reaching (whatever comes first) 800 enrolled pts; 60 events; or 31st January 2018.

Methods: all the patients will receive a preoperative (in the operating room) PFT (ADPtest and TRAPtest) using the aggregometry Multiplate (Roche). The same test will be repeated after protamine administration at the end of CPB.

Definitions of bleeding: 12-hours chest drain blood loss; moderate/severe bleeding adjudicated based on the universal definition of perioperative bleeding (3).

Statistics: ROC analysis with identification of adequate cut-off values and definition of the PPV and NPV

Eligibility criteria: Inclusion Criteria:

* Cardiac surgery with CPB

Exclusion Criteria:

* Known congenital coagulopathy

Primary outcomes:
measure: Postoperative bleeding
timeFrame: 12 hours
Secondary outcomes:
measure: Transfusions
timeFrame: 24 hours
Other outcomes:
Locations:
city: San Donato Milanese
country: Italy
facility: IRCCS Policlinico San Donato
state: Milan
Study officials:
affiliation: IRCCS Policlinico S. Donato
name: Marco Ranucci, MD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Ranucci M, Baryshnikova E, Soro G, Ballotta A, De Benedetti D, Conti D; Surgical and Clinical Outcome Research (SCORE) Group. Multiple electrode whole-blood aggregometry and bleeding in cardiac surgery patients receiving thienopyridines. Ann Thorac Surg. 2011 Jan;91(1):123-9. doi: 10.1016/j.athoracsur.2010.09.022.
citation: Ranucci M, Colella D, Baryshnikova E, Di Dedda U; Surgical and Clinical Outcome Research (SCORE) Group. Effect of preoperative P2Y12 and thrombin platelet receptor inhibition on bleeding after cardiac surgery. Br J Anaesth. 2014 Dec;113(6):970-6. doi: 10.1093/bja/aeu315. Epub 2014 Sep 10.
citation: Dyke C, Aronson S, Dietrich W, Hofmann A, Karkouti K, Levi M, Murphy GJ, Sellke FW, Shore-Lesserson L, von Heymann C, Ranucci M. Universal definition of perioperative bleeding in adult cardiac surgery. J Thorac Cardiovasc Surg. 2014 May;147(5):1458-1463.e1. doi: 10.1016/j.jtcvs.2013.10.070. Epub 2013 Dec 9.