Impact of Ticagrelor Re-load on Pharmacodynamic Profiles

Not Applicable

Completed

Conditions: Coronary Artery Disease

Interventions: Drug: Ticagrelor 90mg
Drug: Ticagrelor 180mg

Registration Number: NCT01731041

Lead Sponsor: University of Florida

Brief Summary: Platelets are parts of your blood that stick together to help form a clot. The stickier your platelets are, the greater your chance of having a heart attack. A clot in the wrong place can lead to a heart attack or stroke. Ticagrelor (Brilinta) keeps platelets from sticking together and it helps people from having a heart attack. The American College of Cardiology has recommended a combination of aspirin and Brilinta as one of the best treatments for the prevention of heart attacks, and death in patients who have had a heart attack or coronary stents. However, it is unknown if Brilinta may improve its work to keep platelets from sticking together giving a loading dose in patients already treated with Brilinta. A loading dose is a one-time increased dose of the same drug. The purpose of this study is to demonstrate whether the platelets of patients treated with Brilinta become less sticky when Brilinta is re-loaded.

Detailed Description: A higher degree of platelet inhibition remains the goal of peri-interventional and long-term anti-thrombotic therapy in patients with coronary artery disease. Previous observations have shown that in patients on clopidogrel therapy undergoing percutanoues coronary intervention who get re-loaded with clopidogrel obtain enhanced platelet inhibition. Ticagrelor represents a new class of nonthienopyridine platelet inhibitors designed to address the limitations of current oral antiplatelet therapy, which has been recently approved for clinical use. However, to date it is unknown if greater inhibition of platelet aggregation can be achieved by adding a ticagrelor loading dose in patients already on maintenance ticagrelor therapy (90 mg twice daily). In addition, how to manage patients undergoing coronary interventions already on chronic ticagrelor therapy with regards to ticagrelor loading is an emerging clinical question which has yet to be explored. Therefore, understanding the pharmacodynamic implications of a ticagrelor re-load strategy in patients on already on chronic ticagrelor therapy is warranted. The scope of the present study is to evaluate the impact of ticagrelor re-load in patients on chronic ticagrelor therapy. A total of 60 patients will be randomized into one of the following two arms of treatment: 1) 90 mg of ticagrelor; 2) 180 mg of ticagrelor. Pharmacodynamic assessments will be performed at baseline, 1-hour and 4-hour after dosing administration. Comparison between baseline and 4-hour values in term of platelet P2Y12 reactivity index determined by whole blood vasodilator-stimulated phosphoprotein will be the primary end-point of the study. Secondary endpoints will include other pharmacodynamic measures.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 60

Inclusion Criteria

Patients with a clinical indication to be on ticagrelor therapy (90mg/bid)
On treatment with ticagrelor 90mg twice daily for at least 14 days
Age between 18 to 80 years
On aspirin <100mg/day

Exclusion Criteria

History of intracranial bleeding
Severe hepatic impairment (ALT >2.5 times the upper limit of normal)
Active bleeding or propensity to bleed
Recent antiplatelet treatment (< 14 days) with a glycoprotein IIb/IIIa antagonist
Platelet count <80x106/mL 7. Hemodynamic instability 8. Serum creatinine <30 mL/min 9. On treatment with oral anticoagulant (Vitamin K antagonists, dabigatran, rivaroxaban) 10. Patients with sick sinus syndrome or II or III degree AV block without pacemaker protection 12. Drugs interfering CYP3A4 metabolism (to avoid interaction with Ticagrelor): ketoconazole, itraconazole, voriconazole, clarithromicin, nefazodone, ritonavir, saquinavir, nelfinavir, indinavir, atazanavir and telithromizycin 13. Hemoglobin < 10g/dL 14. Pregnant females [women of childbearing age must use reliable birth control (i.e. oral contraceptives) while participating in the study].

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Ticagrelor 90mg	Ticagrelor 90mg	Patients randomized to this arm will be administered 90 mg dose of ticagrelor (active comparator, standard dose).
Ticagrelor 180mg	Ticagrelor 180mg	Patients randomized to this arm will be administered 180 mg of ticagrelor (experimental arm, loading dose).

Primary Outcome Measures

Name	Time	Method
Platelet Reactivity Index (PRI) by Vasodilator-stimulated Phosphoprotein (VASP)	4 hours	The primary end-point of the study is the comparison in the platelet reactivity index (PRI%) determined by vasodilator-stimulated phosphoprotein (VASP) between baseline and 4-hour after dosing in each arm of treatment

Secondary Outcome Measures

Name	Time	Method
P2Y12 Reaction Units (PRU) Determined by VerifyNow P2Y12	4 hours	Secondary analysis included the differences of platelet reactivity expressed as P2Y12 reaction units (PRU) in each group using the VerifyNow P2Y12 system.