Intravenous cangrelor as a peri-procedural bridge with applied uses in ischemic events
Review Article

Intravenous cangrelor as a peri-procedural bridge with applied uses in ischemic events

Venugopal B. Bhattad1, Sathvika Gaddam2, Margaret A. Lassiter3, Pooja S. Jagadish4, Devarshi Ardeshna5, Brandon Cave6, Rami N. Khouzam7

1Department of Internal Medicine, Division of Cardiovascular Diseases, 2Department of Internal Medicine, East Tennessee State University, Johnson City, TN, USA; 3Cardiovascular Clinical Pharmacy Department, Johnson City Medical Center, Johnson City, TN, USA; 4Department of Internal Medicine, 5College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA; 6Department of Pharmacy, Methodist University Hospital, Memphis, TN, USA; 7Department of Internal Medicine, Division of Cardiovascular Diseases, University of Tennessee Health Science Center, Memphis, TN, USA

Contributions: (I) Conception and design: VB Bhattad, B Cave, D Ardeshna, PS Jagadish; (II) Administrative support: RN Khouzam; (III) Provision of study materials or patients: All authors; (IV) Collection and assembly of data: VB Bhattad, S Gaddam, MA Lassiter, D Ardeshna; (V) Data analysis and interpretation: VB Bhattad, S Gaddam, MA Lassiter, D Ardeshna, PS Jagadish; (VI) Manuscript writing: All authors; (VII) Final approval of manuscript: All authors.

Correspondence to: Venugopal B. Bhattad. Department of Internal Medicine, Division of Cardiovascular Disease, Quillen College of Medicine, East Tennessee State University, PO Box 76022, Johnson City, TN 37614, USA. Email:

Abstract: Cangrelor is a relatively new antiplatelet drug that has been approved for use as an adjunct therapy to percutaneous coronary intervention (PCI) to decrease peri-procedural myocardial infarction (MI), coronary revascularization, and stent thrombosis. Cangrelor is an adenosine triphosphate analogue with a pharmacokinetic mechanism based on a reversible, dose-dependent inhibition adenosine diphosphate (ADP)-induced platelet aggregation. This drug has lately been in the spotlight as a possible bridge therapy for anti-platelet medication prior to cardiac and non-cardiac surgeries. Platelet function is usually restored within sixty minutes of cessation of therapy, thereby decreasing the risk of bleeding while providing adequate pre-procedural coverage to reduce ischemic events. This manuscript reviews the literature on cangrelor and summarizes its role as a peri-procedural bridge.

Keywords: Cangrelor; percutaneous coronary intervention (PCI); P2Y12; peri-procedural bridge

Submitted Jul 01, 2019. Accepted for publication Jul 15, 2019.

doi: 10.21037/atm.2019.07.64


Dual antiplatelet therapy (DAPT) is a central part of the medical management of patients with coronary artery disease (CAD), specifically those with recent acute coronary syndrome (ACS) events. DAPT includes aspirin plus a P2Y12 receptor inhibitor (e.g., clopidogrel, prasugrel, and ticagrelor) and must be continued for a time between one month and one year based on the patient’s level of heart disease, stent type, and proximity to stent placement (1). Several studies have demonstrated that DAPT decreases the risk of stent thrombosis, and interruption of therapy may increase this risk depending on the time from stent placement (2). The 2014 American College of Cardiology/American Heart Association (ACC/AHA) guideline for the management of patients with non–ST-elevation ACS recommends starting P2Y12 inhibitors as early as possible in patients with ACS. However, a significant number of these patients require urgent or emergent coronary artery bypass grafting (CABG) (3). Administration of an oral P2Y12 inhibitor may delay surgical procedures to allow time for restoration of platelet function (4).

Given the need for DAPT in the early stages of ACS or PCI, there are two major, paradoxical concerns regarding platelet reactivity in the perioperative setting should a patient require emergent CABG. First, interruption of DAPT—particularly among recently-stented patients—has been shown to increase thrombotic risk among patients undergoing surgery (5,6). Second, continuation of DAPT peri-operatively during CABG and non-cardiac surgery demonstrably increases the risk of major bleeding when compared to placebo (7). Acknowledging the increased risk of bleeding in patients undergoing surgery and the risk of ischemia and thrombosis attributable to suspension of antiplatelet therapy, a “bridge” with a rapid onset and offset of action would be an ideal strategy in the management of patients on antiplatelet therapy during the perioperative period.

Cangrelor is an intravenous (IV) P2Y12 inhibitor that has recently emerged as a potential therapy for these high-risk, peri-procedural patients. Studies on cangrelor have failed to demonstrate a significantly increased bleeding risk when P2Y12 inhibitors were stopped and IV cangrelor bridge therapy was used between five and seven days pre-procedurally (8). Additionally, cangrelor has been demonstrated to reduce peri-procedural myocardial infarctions (MIs) in the post-ACS population (9,10). This highlights the potential role of this novel P2Y12 inhibitor among ACS patients.

The guidelines on delaying surgery

The 2011 American College of Cardiology Foundation (ACCF)/AHA Guideline for Coronary Artery Bypass Graft Surgery recommends pre-CABG washout period of five days for clopidogrel [class I, level of evidence (LOE) B] and seven days for prasugrel (class I, LOE: C) due to the increased risk of bleeding events while on P2Y12 inhibitors (11). The 2014 ACC/AHA guideline for the management of patients with non-ST-elevation ACS further specifies that clopidogrel and ticagrelor must be stopped at least 24 hours prior to urgent CABG (class I, LOE: B) (3). This delay allows for the normalization of platelet function. Even ticagrelor, which binds reversibly to platelets must be discontinued at least three days prior to procedures due to its high potency for platelet inhibition (11,12). Until recently, the mainstay of therapy has been glycoprotein IIb/IIIa inhibitors (GPI), namely eptifibatide and tirofiban. However, the development of cangrelor as a short-acting antiplatelet has created opportunities for treatment peri-procedurally.


Benefits of cangrelor

Cangrelor initially gained Food and Drug Administration (FDA) approval in December 2014 for patients undergoing percutaneous coronary intervention (PCI) who have not been treated with a P2Y12 platelet inhibitor and who are not being given a GPI. Approval of cangrelor for this indication was based primarily on the Effect of Platelet Inhibition with Cangrelor during PCI on Ischemic Events (CHAMPION PHOENIX) trial—a large multicenter, randomized, double-blind, placebo controlled trial with 11,145 patients undergoing either urgent or elective PCI while on guideline-recommended medical therapy (9). Cangrelor achieved a marginal benefit over clopidogrel in the composite primary endpoint that was driven by a reduction in peri-procedural MI (9,10). Cangrelor has since been added for this indication to the 2018 European Society for Cardiology/European Association for Cardio-Thoracic Surgery (ESC/EACTS) guidelines on myocardial revascularization [2018] and the 2015 guidelines for the management of ACS in patients presenting without persistent ST-segment elevation (13,14). However, it is not part of American guidelines as of yet.

Pharmacology of cangrelor

Cangrelor is a selective, rapidly reversible P2Y12 platelet receptor inhibitor that directly blocks adenosine diphosphate (ADP)-induced activation and aggregation of platelets and achieves a 90% level of platelet inhibition within five minutes and reaches steady state within fifteen minutes, based on the PCI dosing from the CHAMPION PHOENIX trial (9,10). Due to its rapid onset and offset—having a clinical half-life of five minutes—it allows for a quick, high degree of platelet inhibition and normalization of platelet activity sixty minutes after discontinuation (10,15). In contrast, eptifibatide requires four to six hours for platelet function normalization after discontinuation, and tirofiban needs four to eight hours (16). Cangrelor requires an initial bolus because it has a large volume of distribution—between 3.68 to 3.9 liters (10). Because cangrelor does not need dose adjustments for age, sex, hepatic function, or renal function, it is advantageous over other antiplatelet agents (10).

Perioperative monitoring of cangrelor


Multiple platelet function assays are available that can measure platelet aggregation and inhibition (17,18). The VerifyNow Assay is a point-of-care tool developed to rapidly measure an individual’s response to antiplatelet agents (19). It measures the rate of platelet activation by ADP binding to the P2Y12 receptor via light transmittance in whole blood (20-22). This assay is specific to the platelet P2Y12 receptor and is expressed in P2Y12 reaction units (PRUs). VerifyNow was used specifically to guide cangrelor dosing in the trials brought to the Food and Drug Administration (9,23,24). However, VerifyNow is not without its limitations. Results can be affected by a variety of factors, including thrombocytopenia or anemia as well as the use of GPIs (25).

It is important to note that the target range for effective platelet inhibition to reduce the risk of ischemia and bleeding in the peri-operative setting has not been well established. The VerifyNow manufacturer suggests that normal platelet function can range from 194–419 PRU (22). Among the cangrelor trials, the target was 240 PRUs (8). Notably, other studies have titrated cangrelor to a goal ≤208 PRUs or ≥85 PRUs (26-28).

The Bridging Antiplatelet Therapy with Cangrelor in Patients Undergoing Cardiac Surgery (BRIDGE) trial

The BRIDGE trial is a prospective, randomized-controlled, multicenter trial conducted between 2009 and 2011 (8). The trial included 210 patients treated with an oral P2Y12 antagonist (either clopidogrel, prasugrel, or ticagrelor) following an ACS-event or coronary stent who were to undergo CABG. During the trial, oral P2Y12 antagonists were discontinued, and patients were randomly allocated into either an IV cangrelor or placebo group for at least 48 hours and discontinued one to six hours prior to surgery (8).

The BRIDGE trial was conducted to determine the appropriate dose to maintain the platelet reactivity and to maintain target levels of PRU <240 for all on-infusion time points measured over the bridging period (8). The optimal dose was determined by two cohorts. The first cohort used a dose of 0.5 mcg/kg/min with a goal to attain a predefined platelet inhibition above 60% in 80% of the study population. The initial cohort did not meet the study endpoint, having a platelet inhibition above 60% in only 76.5% of the study population (8). Thus, the study investigators increased the infusion dose to 0.75 mcg/kg/min in the second cohort, yielding a platelet inhibition above 60% in 95.5% of the study subjects (8).

Using the dosing strategy from the second cohort, stage two of the trial found for the primary efficacy endpoint that 98.8% of cangrelor-treated patients maintained target levels of PRU <240 over the bridging period, compared to 19% for placebo-group patients [odds ratio =353; 95% confidence interval (CI): 45.6–2,728; P<0.0001]. The average duration of use was around 72 hours and is the longest duration of any study using cangrelor. Secondary endpoints evaluated included bleeding and thrombotic events, none of which demonstrated a statistically significant difference between study and placebo groups. Particularly the incidence of excessive CABG-related bleeding was balanced between cangrelor (11.8%) and placebo (10.4%), suggesting that cangrelor can safely be used in the CABG setting (8).

Although, cangrelor seemed promising based on the results of the study, the study was limited in two ways. First, it was underpowered to assess the differences in bleeding event rates. Second, degree of platelet blockade affected the risk of ischemic events in cangrelor group compared to placebo. As stated earlier, although PRU is a perioperative tool by which one may be able to tailor therapy, it has not yet been validated for the purposes of clinical outcomes. Of note, this trial only included patients undergoing CABG and cannot be generalized to those undergoing non-cardiac procedures due to difference in bleeding risk (8). While cangrelor shows promise as an IV bridge to cardiac surgery, it has yet to become part of American guidelines.

Other studies on cangrelor as a bridge

Since its release, cangrelor has been increasingly published for use as a peri-procedural bridge in small, retrospective studies or case series as summarized in Table 1.

Table 1
Table 1 Comparison of bridge trial and other smaller retrospective studies that used cangrelor as bridging therapy for DAPT
Full table

Kairouz et al. published a single-center experience of using cangrelor as an antiplatelet bridge in 27 CAD-patients undergoing cardiac and non- cardiac surgery (29). The infusion dose was 0.75 mcg/kg/min and the median time of discontinuation of infusion prior to surgery was 6.75 hours. Two out of twenty-one subjects who underwent cardiac surgeries had major bleeding, but no bleeding events were reported among noncardiac surgery patients (29).

In 2016, Bowman et al. performed a retrospective analysis of eleven patients who underwent coronary artery stenting and received cangrelor bridge therapy prior to cardiac surgery (26). The infusion dose was titrated between 0.5–2 mcg/kg/min to maintain the platelet reactivity <208 PRU. The VerifyNow platelet reactivity assay was used to measure platelet function. The study reviewers suggested starting at low dose, 0.5 mcg/kg/min, to reduce the cost and risk of bleeding and titrate up if needed based on VerifyNow reactivity analysis (26).

Washam et al. presented a retrospective case series of five patients who received cangrelor as a bridge to left ventricular assist device (LVAD) implantation in those requiring DAPT for CAD (30). Two of the five patients had intrathoracic bleeding, but there were no ischemic events during the bridging period (30). Stern et al. published a retrospective case series of 22 patients who received cangrelor at a dose of 0.75 mcg/kg/min (31). There were no reports of thrombosis, but ten of the 22 had major bleeding events (31).

Perioperative bridging versus reversal

Although bridging has been the recommended mainstay of antiplatelet management peri-operatively, on the other end of the spectrum, there is a new potential option on the horizon in the form of antiplatelet reversal. Currently named PB2452, this agent is a monoclonal antibody that binds ticagrelor with high affinity. The drug investigators recently published their phase I trial in healthy volunteers in March of 2019, showing that the agent provided immediate and sustained reversal of the antiplatelet effects of ticagrelor, as measured by VerifyNow P2Y12 Assay (32). Patients received 48 hours of ticagrelor therapy prior to administration of the reversal agent with an 80% suppression of platelet aggregation. Reversal of ticagrelor was attained within 5 minutes after the initiation of PB2452, and was sustained for more than 20 hours, with no evidence of rebound platelet activity after drug cessation.

This new drug may seem like an attractive option for perioperative management in the setting of ticagrelor pre-treatment; however, there are some major concerns that would need to be addressed. Just as with anticoagulant therapy and reversal, immediate discontinuation of short-acting agents, like direct oral anticoagulants, or reversal of warfarin by means of vitamin K and activated four-factor prothrombin complex concentrate, increases the risk of thromboembolic events (33,34). Because of that risk, mitigation and reversal of these agents should be used judiciously in the setting of major, life-threatening bleeding or the need for an emergent procedure. Antiplatelet reversal, when available, should likely be used with the same caution to minimize the risk of in-stent thrombosis, while mitigating bleeding in the peri-procedural setting. Additionally, the reversal was sustained for upwards of 20 hours.

In direct comparison, cangrelor has shown transient recovery in platelet reactivity within the first hour after stopping the infusion (35). In the postoperative setting of cardiac or non-cardiac procedures, P2Y12 inhibitor therapy must be restarted as soon as possible with an appropriate loading dose (7). These competing agents would likely not allow for appropriate post-operative management of antiplatelet therapy to ensure thrombotic risk is minimized. Although a reversal agent might be beneficial in the setting of major, life-threatening bleeds, cangrelor might still hold a place for peri-procedural management of antiplatelet therapy where quick on and off-set antiplatelet activity may be more desirable.


Due to the increasing number of patients on antiplatelet therapy for cardiovascular and neurological conditions, it can be challenging to manage these patients peri-operatively. It is critical to prevent ischemia and thrombosis, and at the same time decrease the risk of bleeding, necessitating the need for a successful bridging therapy. Cangrelor looks promising as a bridging therapy with its distinctive pharmacokinetic profile with fast activity and easy reversibility. However, large prospective studies are required to delineate clear guidelines to identify the patient population that would receive maximum benefit from bridging antiplatelet therapy, determine optimal dosing and titration, monitoring therapy, and manage adverse events. Although guidelines recommend IV bridge therapy in these settings, no agent currently has FDA-approval for this indication and positive, randomized controlled data for GPIs in this setting is also lacking. Cangrelor bridging therapy appears to have advantages over the previous standard using GPIs due to its faster offset and non-renal clearance (36). Future research is warranted for use of cangrelor in special populations, such as those with CAD on DAPT as a bridge to LVAD implantation. Overall, in this complex era of advancing medical technologies, therapies such as cangrelor may mitigate thrombotic and bleeding risks in the peri-operative period.




Conflicts of Interest: Dr. Cave discloses that he serves on the speaker’s bureau for Portola pharmaceuticals. The other authors have no conflicts of interest to declare.

Ethical Statement: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.


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Cite this article as: Bhattad VB, Gaddam S, Lassiter MA, Jagadish PS, Ardeshna D, Cave B, Khouzam RN. Intravenous cangrelor as a peri-procedural bridge with applied uses in ischemic events. Ann Transl Med 2019;7(17):408. doi: 10.21037/atm.2019.07.64