Delayed Cold-Stored Platelets -PLTS-1

Cardiac Surgery Clinical Trial

— PLTS-1  

Official title:

A Clinical Comparison of Cold-stored and Room Temperature-stored Allogeneic Platelet Transfusions in Bleeding Adult Cardiac Surgery Patients - A Randomized Multicentre Pilot Study (PLTS-1 Study)

Clinical Trial Details — Status: Not yet recruiting

Administrative data

• NCT number: NCT06147531
• Other study ID #: 22-5855
• Status: Not yet recruiting
• Phase: Phase 2
• Start date: April 2024
• Est. completion date: December 2026

Study information

• Verified date: March 2024
• Source: University Health Network, Toronto
• Contact: Keyvan Karkouti, MD
• Phone: 416-340-4800
• Email: Keyvan.Karkouti[@]uhn.ca
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

PLTS-1 is a multicentre, randomized, controlled, pilot trial, using a conventional, parallel group, two-armed design at 2 cardiac surgery centres in Canada. The study is designed to assess the feasibility of a future, definitive RCT to determine the non-inferiority of cold-stored platelets compared to conventional platelets with respect to hemostatic effectiveness (total number of allogeneic blood products transfused within 24 hours after CPB), as well as safety.

Recruitment information / eligibility

• Status: Not yet recruiting
• Enrollment: 150
• Est. completion date: December 2026
• Est. primary completion date: December 2025
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

Adult (=18 years old) patients undergoing elective cardiac surgery with CPB will be eligible for inclusion if they are planned to undergo at least moderately complex surgery or have a preoperative platelet count =150,000 x106/L (this is a group at high risk of requiring platelet transfusions post-CPB).

Moderately complex index surgery is defined as:

1. repair/replacement of more than one valve;

2. aorta (root/ascending/arch) replacement;

3. any combination of coronary artery bypass grafting, valve repair/replacement, or aorta (root/ascending/arch) replacement; or

4. re-do procedures consisting of a repair or revision of a prior cardiac intervention. Exclusion Criteria: Patients will be excluded if cold-stored platelets are not going to be available at the

time of surgery or if the patient:

1. has a congenital or acquired hemostatic disorder (including platelet refractoriness due to anti-platelet and anti-human leukocyte antigen [HLA] antibodies) and/or requires specially matched platelets (including patients with anaphylaxis to blood due to Immunoglobulin A [IgA] deficiency),

2. has known contraindications to heparin, thereby excluding cases where non-reversible anticoagulants (i.e. argatroban) are used,

3. is on warfarin or direct oral anticoagulants (dabigatran, rivaroxaban, apixaban or edoxaban) within 3 days prior to surgery,

4. is on antiplatelet drugs within 5 days prior to surgery (excluding acetylsalicylic acid [ASA]),

5. refuses allogeneic blood products,

6. has a known pregnancy,

7. has already enrolled in this study,

8. is enrolled in another interventional clinical trial where routine care and management are altered,

9. has hemodynamic instability defined as critical care admission, vasopressor, or inotrope dependence prior to index surgery, or

10. has pre-operative requirement for, or expected post-operative dependence upon mechanical circulatory support (i.e., intra-aortic balloon pump, ventricular assist device).

Related Conditions & MeSH terms

• Bleeding
• Cardiac Surgery
• Cardiopulmonary Bypass
• Hemorrhage
• Platelets

Intervention

Biological:
• Delayed Cold-Stored Buffy Coat Platelets
To prepare cold-stored platelets, blood banks will transition conventional room temperature platelets up to 4 days after collection (with agitation) to cold-storage (at 1-6 C without agitation) for a minimum of 1 day (24 hours) and a maximum of 10 days after collection (for a total shelf life of = 14 days after collection). Thus, cold-stored platelets will be produced and stored the same way as room temperature platelets up until their transition to cold-storage, ensuring similar products differing only in storage conditions and expiration date (as cold-stored platelets will have an expiration date beyond the current 5 days for pathogen inactivated platelets or 7 days for bacterially cultured platelets). Pathogen reduced platelets will be used for the pilot study (Canada is transitioning in 2022-23 to pathogen-reduced platelets and one site has already transitioned).
• Room Temperature Buffy Coat Platelets
Room temperature stored platelets are prepared from donor whole blood, which is centrifuged to collect the buffy coat layer containing platelets. Seven ABO matched buffy coats from male and/or female donors are pooled in 280 ml of platelet additive solution and split into a single dose after pathogen inactivation, resulting in a product with a final platelet count of approximately 1300 x 109. Pathogen inactivated platelets (shelf-life of 5 days, with recent Health Canada approval for an extension of the shelf-life to 7 days), will be used as Canada is transitioning in 2022-23 to pathogen-inactivated platelets and one site has already transitioned.

Locations

Country	Name	City	State
Canada	Kingston Health Sciences Centre	Kingston	Ontario
Canada	Toronto General Hospital - University Health Network	Toronto	Ontario

Sponsors (3)

Lead Sponsor	Collaborator
University Health Network, Toronto	Canadian Blood Services, Queen's University

Country where clinical trial is conducted

Canada, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Feasibility Outcome 1: Adequate Patient Recruitment	Adequate recruitment (defined as = 15% of eligible patients enrolled per centre per month to target consistent levels of enrollment).	through study completion, an average of 1 year.
Primary	Feasibility Outcome 2: Adequate cold-stored platelet supply	Adequate cold-stored platelet supply (defined as appropriate product available at the time of surgery for =90% of patients randomized to the cold-stored platelet group).	through study completion, an average of 1 year.
Primary	Feasibility Outcome 3: Adequate clinician adherence to randomization assignment.	Adequate clinician adherence to randomization assignment (defined as >90% of all randomized patients are administered the assigned product).	through study completion, an average of 1 year.