Antiplatelet Therapy in Hemodialysis Patients Undergoing Percutaneous Coronary Interventions

AUTHORS

Francesco Summaria 1 , * , Maria B. Giannico 1 , Giovanni P. Talarico 1 , Roberto Patrizi 1

1 Department of Cardiology-Policlinico Casilino, Catheter Laboratory, Rome, Italy

How to Cite: Summaria F, Giannico M B, Talarico G P, Patrizi R. Antiplatelet Therapy in Hemodialysis Patients Undergoing Percutaneous Coronary Interventions, Nephro-Urol Mon. 2015 ; 7(4):e28099. doi: 10.5812/numonthly.28099.

ARTICLE INFORMATION

Nephro-Urology Monthly: 7 (4); e28099
Published Online: July 22, 2015
Article Type: Review Article
Received: February 21, 2015
Accepted: March 17, 2015
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Abstract

Context: Coronary artery disease is highly prevalent among patients with end stage renal disease/hemodialysis (ESRD/HD) and coronary percutaneous interventions (PCI) has been increased by nearly 50% over the past decade. After PCI with stent placement, guidelines recommend dual antiplatelet therapy (DAPT), but no specifically tailored pharmacotherapy approach is outlined for this frail population, mostly excluded from large randomized clinical trials (RCTs).

Evidence Acquisition: We reviewed current evidences on the use of antiplatelet therapy in patients with ESRD/HD undergoing PCI, focusing on the efficacy and safety of specific agents and their indications for detailed clinical settings.

Results: Clinical setting in HD patients is the principal determinant of the type, onset, combination and duration of the DAPT. However, irrespective clinical setting, in addition to aspirin, clopidogrel is currently the most used antiplatelet agent even if no information derived from RCTs are available in ESRD. Due to the large experience acquired in routine clinical practice, the awareness of safety is higher for clopidogrel than newer antiplatelet agents. Because of lack of data, the use of prasugrel and ticagrelor is actually not recommended. However, in case of high ischemic and acceptable bleeding risk, they may be selectively used in ESRD/HD.

Conclusions: This investigation might contribute to delineate the best treatment options for this high risk population.

Keywords

Percutaneous Coronary Interventions Antiplatelet Therapy Hemodialysis Patients Clopidogrel Prasugrel Ticagrelor Drug Eluting Stent

Copyright © 2015, Nephrology and Urology Research Center. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

1. Context

Due to the pandemic of diabetes (1), increasing rates of hypertension and ageing population (2, 3), the incidence and prevalence of end-stage renal disease (ESRD) is rising worldwide (2, 4). In this high-risk population, cardiovascular disease is the leading cause of death and morbidity. Coronary artery disease (CAD) is highly prevalent in patients with ESRD and myocardial revascularisation has become an attractive therapeutic option. Compared to percutaneous intervention (PCI), coronary artery bypass grafting (CABG) is associated with higher early and 30 day mortality in ESRD (5). Furthermore, despite increased risks of stent thrombosis and bleedings, coronary stenting in patients on dialysis has been increased by nearly 50% over the past decade. The dual antiplatelet treatment (DAPT) is the cornerstone treatment after stent implantation, hence the large use of PCI, especially in acute clinical setting, raises the unmet need to optimize this therapy in hemodialysis (HD) patients undergoing PCI.

Since randomized controlled trials (RCTs) are lacking, the current guidelines on percutaneous coronary revascularization are inadequate to provide a specifically tailored therapeutic approach for HD patients. Although many differences have been found principally related to comorbidities and bleedings, the recommendations for general population have been adapted to ESRD setting. A previous study reported a lower probability of bleeding in HD patients with an optimized treatment of anemia (6) supporting an improved safety when antiplatelet therapy is a part of a global therapeutic strategy.

ESRD affects platelet function and coagulation cascade resulting in hemorrhagic tendencies and pro-thrombotic state (7). An abnormal platelet function seems to play a pivotal role in bleeding complications, principally related to defective subendothelial adhesion mediated either by impaired expression of membrane glycoprotein receptor or intrinsic defects of synthesis, storage and release of platelets mediators.

Moreover, uremic platelets show enhanced procoagulant activity (increased thrombin generation, higher concentrations of von Willebrand factor) (8-11) and platelet-derived microparticles (12). These microparticles exert a procoagulant activity by overexpressed membrane receptors for factor Va contributing to acceleration of thrombin generation. By note, increased levels of fibrinogen, D-dimer and prothrombin fragments (13-15), as well as reduced, anticoagulant activity of protein C, protein S, antithrombin III, plasminogen and tissue type plasminogen activator are frequently found in HD patients contributing to hypercoagulable state (15). HD patients have an increased risk of site and non-site of access related bleeding complications. Considering the impact of bleeding on adverse outcome after PCI (16-19), the safety/efficacy balance of antiplatelet therapy in HD patients represents a crucial issue, affecting poor prognosis and contributing to explain underutilization of antithrombotic medications.

2. Evidence Acquisition

The scope of this review was to provide an overview of the current evidence on the use of antiplatelets agents actually available, its current and potential use and reviewing the safety and efficacy data in HD patients undergoing PCI.

Considering current guidelines on myocardial revascularization of the European Society of Cardiology (ESC) and of the European association for cardio-thoracic surgery (EACTS) (20), American heart association/american college of cardiology (AHA/ACC) Guidelines for the management of patients with non-ST-elevation acute coronary syndromes (21), a systematic search was performed on MEDLINE, EMBASE and the cochrane central register of controlled trials. Randomized controlled trials (when available), observational studies, together with case series, systematic reviews and expert opinion, comparing different treatment strategies and risk of bleeding were collected, analyzed and discussed.

3. Results

Observational studies suggest that patients with chronic kidney disease (CKD) and multivessel disease undergoing revascularization have better short- and long-term survival than those receiving medical therapy alone (22-24), especially during acute coronary syndromes (ACS). However, HD patients, having an increased risk of periprocedural ischemic and bleeding complications are frequently excluded from most RCTs on revascularization; hence current treatment strategies are based on retrospective analyses of RCTs and data from registries.

The results from the US renal data system (21981 patients) suggest that CABG should be preferred over PCI in ESRD only for multivessel coronary disease and in appropriately selected non ACS patients (25). The ESC guidelines on myocardial revascularization for ESRD indicated that selection of the most appropriate revascularization strategy must account for the general condition and life expectancy, the least invasive approach being more appropriate in the most fragile and compromised patients, suggesting PCI as a more suitable coronary revascularization strategy.

When PCI is indicated, newer generation drug eluting stent (DES) (class I level of evidence B) (20) should be preferred over bare metal stent (BMS), because of its lower risk of restenosis and improved safety concerns (stent thrombosis) compared to the first generation DES and BMS (26, 27).

3.1. Aspirin

Although Aspirin in primary prevention by inhibiting the synthesis of renal prostaglandins, over the time, can worsen renal function unbalancing the safety/efficacy profile, in patients with CAD, low dose aspirin is still largely used even despite severe renal impairment.

During ASA therapy, a linear correlation between higher dose and bleeding risk (principally gastrointestinal) has been found. Gastrointestinal bleeding is the third most common ICU admission diagnosis for HD patients ranged from 12% to 20% in different reports (28). Hence, a daily long-life maintenance dose from 75 to 100 mg/day seems to be a safe option.

3.2. Clopidogrel

Clopidogrel, a second generation oral thienopyridine, is a prodrug converted into active metabolites through a two-step reaction involving cytochrome P450 enzymes, leading to an irreversible blockade of the P2Y12 receptor. Compared with prasugrel and ticagrelor, this conversion results in a lower onset of action and a larger variability in bioavailability. In the CURE study, adding clopidogrel to standard treatment reduced the absolute and relative primary ischemic endpoint only in the middle and upper tertiles of renal function, without any significant improvement in outcome in lower tertile (eGFR, < 64 mL/min) increasing minor and moderately major and life-threatening bleeding (29).

3.3. Prasugrel

Prasugrel is a third generation oral thienopyridine, which is a specific, irreversible antagonist of the platelet adenosine 5’-diphosphate P2Y12 receptor. Prasugrel has more potent antiplatelet activity, faster onset of action and less interpatient variability compared with clopidogrel. These pharmacodynamic properties in TRITON-TIMI 38 study led prasugrel to be more effective than clopidogrel in preventing ischemic events in patients with ACS undergoing PCI. Although in ESRD, exposure to the active metabolite of prasugrel is lower than healthy control, this does not affect platelet aggregation (30). Hence, during prasugrel therapy, a dose adjustment based on renal function is not recommended, but the drug label reminded the limited experience in stage 5 CKD, as in TRITON-TIMI 38 study a post-hoc subgroup analysis could be performed only for patients until stage 3 to 4 CKD (1490 patients).

3.4. Ticagrelor

Ticagrelor is a cyclopentyltriazolopyrimidine, with a plasma half-life of approximately 6 - 12 hours and unlike clopidogrel and prasugrel, requires a dual daily administration and binding reversibly to the P2Y12 receptor. Ticagrelor is metabolized minimally from the kidneys.

Its effectiveness in ACS was tested in the PLATO trial, in which CKD subgroup well represented consisting in nearly 21% of the overall study population.

In 3237 patients with stages 3 to 4 CKD, ticagrelor was associated with a higher absolute (4.7% vs 1.0%) and relative (23% vs 10%) reduction of primary ischemic end point than clopidogrel.

Similarly to the overall PLATO population, patients with CKD had 4% absolute risk reduction in all-cause mortality (31) without any significant increase in bleedings (i.e. major and fatal bleedings, non-coronary bypass related major bleedings). However, if the more contemporary Modification of Diet in Renal Disease formula is used instead of the Cockcroft-Gault equation, as recommended by The National Kidney Foundation, the primary end point and mortality became statistically significant limiting the superiority of ticagrelor over clopidogrel only in stages 3 to 4 CKD (32). This favorable effect probably related to a pleiotropic non-antiplatelet related action (increased circulating levels of adenosine) needs to be definitively confirmed.

Similarly to clopidogrel and prasugrel, ticagrelor requires no dose adjustment based on renal function, but its use in patients with ESRD is not recommended because of lack of data in this specific subpopulation.

3.5. Pre-Treatment With P2Y12 Inhibitors

3.5.1. Clopidogrel

The rationale of pre-treatment with P2Y12 inhibitors is based on the observation that periprocedural ischemic complications are related to the degree of intraprocedural platelet inhibition, following the results of old clopidogrel studies. In these trials, the delay between clopidogrel 300 mg loading dose and PCI was adequate to ensure circulating effective levels of active metabolites. Recent meta-analysis evaluating the clopidogrel pre-treatment, showed a benefit related to the severity of clinical presentation; no improvement in ischemic outcomes with more bleedings in PCI for stable angina (SA), but a significant reduction in cardiovascular events (driven mainly by myocardial infarction) without significant excess in major bleedings in ACS (33).

3.5.2. Prasugrel and Ticagrelor

In the ACCOAST study, a pretreatment strategy with prasugrel in NSTE-ACS failed to reduce the primary endpoint (a composite of cardiovascular death, myocardial infarction, stroke, urgent revascularization and bail-out GPIIb/IIIa inhibitor use) and was stopped prematurely for major bleedings concerns (34). A similar result was also obtained in stable clinical setting of the ARMYDA-5 study, in which a pretreatment with prasugrel versus 600 mg clopidogrel loading dose failed to reduce ischemic events with an excess risk of bleeding.

The recently published ATLANTIC study mentioned that prehospital administration of ticagrelor did not improve pre- primary PCI coronary reperfusion, but is safe (similar rates of major bleeding) with a significant reduction in stent thrombosis. Moreover, the study population, differently from HD patients, had a lower ischemic risk and TRA approach (contraindicated in HD patients) had been largely used (35).

Considering all the above results, as the absence of data for HD patients and the higher basal risk of bleeding:

A. Pretreatment with prasugrel is contraindicated either in SA or NSTEMI.

B. Clopidogrel pretreatment with 300 mg loading dose of at least 6 hours before PCI is recommended in a stable setting.

C. Clopidogrel 600 mg loading dose should be used only in NSTEMI undergoing early invasive strategy with PCI (delay time < 3 hour) and in STEMI undergoing primary PCI.

D. Ticagrelor pretreatment in primary PCI is not contraindicated, but not recommended considering scarce specific data for HD patients.

3.6. Clinical Settings

The clinical setting is the principal determinant of the type, onset, combination and duration of the antithrombotic therapy (Table 1).

Table 1. Evidence, Duration and Type of Antiplatelet Related to Clinical Setting
Clinical SettingASAClopidogrelPrasugrelTicagrelorDAPT duration
Stable Anginayesyesnono1 month for (BMS) 6 months (newer DES) 12 months (first generation DES)
NSTEMIyesyes (class I level of evidence B) (21)only in stented patients if not contraindicatedyes (class I level of evidence B) (21)12 months irrespective type of stent
STEMIyesyes (class I level of evidence C) (20)yes (class I level of evidence B) (20)yes (class I level of evidence B) (20)12 months irrespective type of stent

3.6.1. Stable Coronary Artery Disease

As bleeding hazards might be increased, antiplatelet agents in HD patients should be cautiously used in a stable setting with low annual risks of cardiovascular events and medically-alone managed conservative strategy. Nevertheless, when an ischemia driven coronary intervention is performed, a DAPT is strongly recommended to avoid stent thrombosis and adverse coronary events.

DAPT includes a 150 - 300 mg oral loading dose of acetylsalicylic acid (ASA) (or 80 - 150 mg i.v.) in patients never treated, followed by 75 - 100 mg daily plus a clopidogrel 300 mg loading dose, if the procedure is performed from 3 to 6 hours after load or 600 mg loading dose, if performed prior to 3 hours after load, followed by 75 mg daily (36, 37).

Double clopidogrel maintenance dose has been proposed in high thrombotic risk patients (e.g. diabetes, recurrent myocardial infarction, stent thrombosis, complex lesion, non-responders) (38). In particular, in hemodyalisis patients, no scientific evidences of short or long term ischemic benefit are available for double dose clopidogrel regimen, so that it would not be advisable for its higher bleeding concerns. Despite newer more potent P2Y12-receptor antagonist, in stable non ACS clinical setting, as guidelines reported, only clopidogrel is recommended.

As single antiplatelet therapy, ASA is followed lifelong after the first month (if BMS is used) or after the sixth month (if new generation DES is used) (38, 39).

3.6.2. Acute Coronary Syndromes

The American national kidney foundation guidelines found that all HD patients with ACS should be managed equally to non-dialysis patients including DAPT and PCI.

In ACS, renal function is significantly correlated with MACE. In particular compared to patients with normal function, HD patients have a 30- and 10-fold higher in-hospital mortality during STEMI and NSTEMI, respectively. This worse clinical outcome seems to be related to different mechanisms:

A. more severe coronary involvement (3 vessels or left main disease in about 40%)

B. higher comorbidities rate

C. underutilization of cardiac medications with possible and/or suspected sub-optimal response

D. disease and/or drug related excess of bleeding

E. high risk of restenosis and stent thrombosis

To balance the efficacy/safety ratio, a systematic approach based on individual integrated ischemic and bleeding risk assessment should be used in all ACS patients undergoing PCI to individualize DAPT and to guide the time of revascularization.

Many risks calculators have been proposed, but at present the more validated and widely used are the GRACE risk score and CRUSADE bleeding risk calculator. Concerning the GRACE, a serum creatinine level > 4 mg/dL is one of the most powerful parameters related to an increased risk of in-hospital and 6-month mortality, hence when an ACS occurs, HD patients very often are at high ischemic risk. Similarly for CRUSADE bleeding risk calculator, a creatinine clearance < 15 mL/min confers a score of 39 confirming the impact of an impaired renal function on risk of bleeding during ACS.

Indeed transradial access (TRA) by dramatically reducing the rate of vascular bleeding leads to a significant reduction of adverse events and mortality, especially in high-risk subgroups (40). However, HD patients are not elective candidates to TRA because of the risk of radial thrombosis and occlusion. For this reason, the Fistula First Breakthrough Initiative recommends avoiding the use of TRA in patients with HD and advanced CKD, leaving the DAPT a major concern in this combined ischemic + hemorrhagic risk population.

3.6.3. Non-ST-Segment Elevation Myocardial Infarction

In HD patients, management of NSTEMI has less consensus than that of STEMI and stable angina. The 2014 ACC/AHA guidelines on management of NSTEMI report no specific recommendations for antiplatelet use in HD patients. The main reason of this gap must be sought in the wider spectrum of risk along with different timing and type of revascularization.

DAPT includes aspirin with an oral pre-procedural loading dose of 150 - 300 mg (or 80 - 150 mg i.v.), followed by 75 - 100 mg P. O. daily and a P2Y12-receptor antagonist.

In particular, guidelines (21) stipulate that Clopidogrel or Ticagrelor (Class I Level of evidence B) is the first treatment choice.

According to the TRITON study design and the results of TRILOGY-ACS and ACCOAST, prasugrel is not recommended for “upfront” therapy in patients with NSTEMI, but only in “stented” patients.

In particular, in the TRITON-TIMI 38 study, prasugrel compared to clopidogrel, resulted in a 19% reduction of ischemic events in moderate to high risk ACS patients undergoing PCI, started in the catheterization laboratory after diagnostic angiography in thienopyridine-naive patients. However, the greater protective effects toward ischemic events were partially counterbalanced by an increased risk of bleeding and the net clinical benefit (a combined ischemic and TIMI major hemorrhages) remained in favor of prasugrel only in the high ischemic risk CKD subgroup as diabetic patients and stent thrombosis presenting with ACS (41).

In the PLATO, patients with moderate to high-risk NSTEMI undergoing PCI had significantly lower primary endpoint occurrence with ticagrelor than clopidogrel (11.4% vs. 13.9%). The rate of TIMI major non-CABG-related bleeding was higher in ticagrelor group (2.8%) than clopidogrel group (2.2%), but TIMI major CABG-related bleeding was less frequent than clopidogrel. There was no difference in the overall rates of fatal hemorrhage (0.3% in both groups) despite a higher rate of fatal intracranial hemorrhage in the ticagrelor group (0.1% vs. 0.001%; P < 0.02).

The CURRENT-OASIS 7 trial tested whether a double dose regimen of clopidogrel (600 mg loading dose followed by 150 mg daily dose for 7 days, then 75 mg daily) was superior to standard dose in ACS patients. Overall, the higher dose regimen conferred similar results than standard dose in major adverse cardiac events at the cost of increased TIMI major bleedings and need for blood transfusion, resulting in a wrong way, especially in high risk of bleeding HD patients (42).

3.6.4. ST-Segment Elevation Myocardial Infarction

Due to the increased hemorrhagic risk associated with thrombolytic therapy, primary PCI should be considered the preferred reperfusion therapy in HD patients. Patients undergoing primary PCI should receive a combination of DAPT with ASA and a P2Y12 receptor blocker as early as possible.

An oral loading dosage of ASA 150 - 300 mg (or i.v. 80 - 150 mg) followed by 75 - 100 mg P.O. daily should be associated with the preferred P2Y12 inhibitors, prasugrel (60 mg P.O. loading dose, 10 mg maintenance dose) or ticagrelor (180 mg P.O. loading dose, 90 mg maintenance dose b.i.d.) (43, 44) because of a more rapid onset of action and greater potency and superiority to clopidogrel in large outcome trials (45, 46) (Class I Level of evidence B) Clopidogrel should be used preferably when prasugrel or ticagrelor is either not available or contraindicated (Class I Level of evidence C).

In the pre-specified subgroups of patients with STEMI undergoing PCI in the TRITON–TIMI 38 trial, the benefit of prasugrel was consistent for the primary endpoint (prasugrel 10.0% vs. clopidogrel 12.4%, HR 0.79; 95%, CI 0.65 - 0.97, P = 0.02), without a significant increase in non-CABG-related bleeding risk (2.4% vs. 2.1%, HR 1.11; 95%, CI 0.70 - 1.77, P = 0.65). There was a lower risk of stent thrombosis (1.6% vs. 2.8%, HR 0.58; 95%, CI 0.36 - 0.93, P = 0.02), as well as cardiovascular mortality (47) in favor of prasugrel at 30 day and 15 month follow-up (2.4% vs. 3.4%, HR 0.74; 95%, CI 0.50 - 1.09, P = 0.129). In the subset of patients with STEMI randomized in the PLATO trial, the benefit of ticagrelor over clopidogrel for the primary endpoint (9.4% vs. 10.8%, HR 0.87) (48), was consistent with the overall results, without increased bleeding (TIMI non-CABG major bleedings 2.5% vs. 2.2%, HR 1.09; 95% CI 0.80 - 1.48, P = 0.60), but with a trend towards a lower risk of cardiovascular mortality at one year. In a pooled analysis of 48599 patients, of whom 94% presented with ACS and 84% had PCI, prasugrel and ticagrelor associated with a mortality benefit and no significant excess of major bleeding among STEMI patients (49).

In conclusion, Prasugrel is contraindicated in patients with prior stroke or TIA and generally not recommended for patients aged 75 years and older. Despite the fact, if treatment is necessary in the ≥ 75 years age or low body weight (< 60 kg), after a careful individual risk benefit evaluation, following a loading dose of 60 mg, a reduced maintenance dose of 5 mg should be prescribed resulting in greater platelet inhibition than clopidogrel 75 mg/day and similar bleeding rates (50).

Both prasugrel and ticagrelor are contraindicated in patients with prior hemorrhagic stroke or with moderate to severe liver disease.

3.6.5. Special Considerations

3.6.5.1. Stent Selection and DAPT Compliance

Taking into account the rates of restenosis and stent thrombosis in HD patients, newer generation DES should be preferred over BMS and first generation DES (Class I Level of evidence B) (20).

Among DES, despite no differences found between paclitaxel and limus eluting stent in MACE and target lesion revascularization (51, 52), the newer everolimus and zotarolimus eluting stent should be preferred for the lower rates of stent thrombosis and given the possibility of discontinuing, if necessary, DAPT prior to 12 month (53, 54). Table 2 summarizes device characteristics, indication and potential use of currently available stents in HD patients (55).

Table 2. Device Characteristics, Indication and Potential Use of Currently Available Stents in Hemodialysis a
Type of StentRestenosisStent ThrombosisStudies in HDStent-Related DAPT DurationPotential Indication in HD ptsGuidelines Recommendations
BMShighlowyes1 monthlimited due to high rate of restenosisnot preferred
First generation DESlowhighyes12 monthyesconsidered but not recommended
Newer generation DESvery lowvery low (lower than BMS)yes1 month (zotarolimus eluting stent) (55) 3 month (everolimus eluting stent, CE mark) 6 month Overall (20)Yes preferredclass I level of evidence B (c)
DCSlowlownoneVirtually 1 month if confirmed (leaders free trial) (56)yes considering the possible shortening of DAPTnot evaluated
BVSlownone12 monthlimited for high calcified coronary lesionsnot evaluated

a Abbreviations: BMS: Bare metal stent, BVS: Bioresorbable vascular scaffold, DCS: Drug coated stent DES: Drug eluting stent.

There is a significant gap in the literature concerning the outcomes related to DAPT duration. Most HD patients, prematurely discontinue thienopyridine prior to one year after PCI, data collected from the US Renal Data System showed that at 3 month, 82% of patients who received a DES were still on thienopyridine; the proportion decreased to 40% at 12-month, while in patients who received a BMS, these rates were lower (70% and 26% at 3 and 12 month). However, in DES patients, there was evidence of higher risk of death or MI associated with thienopyridine discontinuation, in BMS patients no increase in ischemic events was recorded, but possibly lower risk of major bleeding with drug discontinuation. Interestingly in this registry, the rate of myocardial infarction, death and repeated revascularization were 6 to 10 fold higher than the general population suggesting that the worse outcome of patients on dialysis is a possible indication to extend the DAPT over 12 month (56). However, these results are not able to provide a definitive indication, further studies are needed in this field.

3.6.5.2. Antiplatelet Tests Assessment

Patients with ESRD exhibit high residual platelet reactivity on treatment with clopidogrel regardless of diabetes (57). Hyporesponsiveness to thienopyridines in CKD is associated with increased risk of stent thrombosis and adverse events, including mortality (58, 59). Despite the fact, guidelines confirm no evidence for routine platelets assessment and phenotype testing; in HD patients undergoing PCI platelet function testing has been suggested (58), especially among those who experience thrombotic events despite DAPT. Three small studies (60-62) with very short follow-up tested and confirmed a more intense antiplatelet effect with prasugrel or ticagrelor compared to high dose clopidogrel in HD patients. However, different considerations should be made about these studies:

A. In the prasugrel study (21 patients), no bleeding events at 30 days were recorded, but concomitant use of ASA was only in the half of the patients. Patients with previous stroke, ACS, severe bleedings, chronic oral anticoagulant, PCI and CABG were excluded, 19% remained hyporesponsive even on prasugrel.

B. The two ticagrelor studies (respectively 20 patients and 25 patients) (60, 61) were performed principally in a stable setting, 13% of patients excluded for low compliance, 20% had dyspnea and/or bleeding.

4. Conclusions

Cardiovascular events are responsible for 44% of death in HD patients (63). However, in the last decade, there has been a gradual decline in mortality principally due to 30-day reduced mortality for STEMI. This reduction must be related to either large use of antiplatelet agents and statin (64) or increased use of coronary revascularization. While overall use of coronary revascularization has changed little over the past ten years, preliminary data indicate an increased use of early PCI in STEMI. Despite its large use, no informations derived from RCTs are available for clopidogrel in patients with severe renal dysfunction. However, the awareness of safety is higher for clopidogrel than prasugrel or ticagrelor, mostly due to the large experience occurred in routine clinical practice (62) (Table 3).

Table 3. Evidence Comparison Between Different Antiplatelet
AntiplateletEvidence in Hemodialysis
Acute Coronary SyndromesStable Angina
RCT’sregistriesRCT’sRegistries
ClopidogrelnoneUS renal data system (56)noneUS renal data system (56)
PrasugrelnoneUS renal data system (59 pts) (56)21 pts (60)12 + 16 pts (30)
Ticagrelornonenone20 pts (61) 25 pts (62)none

Considering the evidence provided, it is premature to suggest substantial changes in current clinical practice. Despite previously discussed limitations, Clopidogrel maintains a central role in patients undergoing PCI. The use of point-of-care assays could be useful to overcome the commonly hyporesponsiveness to clopidogrel widening the use of prasugrel and ticagrelor.

Summarizing the recommendations for clinical practice (Table 4) is as follows;

A. Aspirin should be administered at low dose regimens (< 100 mg) long-life.

B. Clopidogrel remains the only choice in case of PCI in a stable clinical setting and despite clinical setting, in patients requiring P2Y12-inhibiting therapy with a basal high risk of bleeding (included patients taking oral anticoagulant therapy).

C. Even if not recommended, Prasugrel should be considered only in patients with ACS undergoing PCI with an individual ischemic risk and/or thrombotic burden higher than bleeding risk (i.e. diabetic, STEMI, stent thrombosis in clopidogrel treated). It should be used with caution in patients with low weight and the elderly (> 75 years) possibly at 5 mg reduced dose. It is contraindicated in patients with a prior transient ischemic attack/stroke or previous intracranial hemorrhage.

D. Although ticagrelor can be used across the spectrum of ACS until stage 4 CKD patients, its use should be carefully considered in patients with poor compliance given its twice-daily administration.

E. Ticagrelor is contraindicated in patients with prior hemorrhagic stroke and severe hepatic impairment and cautiously used in patients treated with potent inhibitors or inducers of CYP3A due to potential drug interactions.

Table 4. Pro/Cons of Antiplatelet Agent
AntiplateletProCons
Clopidogrel
awareness of safetyprodrug
large registries datalower onset of action
less bleedingslarger variability in bioavailability
no RCT’s confirmed efficacy
Prasugrel
high effectiveness in ACS STEMI subgroup potentially harmful in prior TIA/Stroke
high effectiveness in stent thrombosissuspected platelet hyporesponsiveness in HD
limited clinical experience in HD
Ticagrelor
efficacy in broad spectrum of ACSmore hemorrhagic stroke
less CABG-related bleedingharmful in severe hepatic impairment
less increase of fatal bleedings, andtwice daily administration
non-CABG related bleedings in CKDlimited clinical experience in HD

In conclusion, current guidelines are not HD centered then the primary goal to improve the quality of care preserving patient’s health and safety is not simple to accomplish in clinical practice and should be guaranteed with a personalized medicine approach.

Footnote

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