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Heart. 2007 October; 93(10): 1293.
PMCID: PMC2000926

Featured Correspondence

The authors' reply: We thank Drs Kalyanasundaram, Kastrati and Berger for their interesting comments about our article.

Patients included in our subgroup meta‐analysis were not routinely scheduled for an early coronary revascularisation, so our results are not directly comparable with the ISAR trials. Patients did not receive clopidogrel as background medication at the time of admission, but almost all received dual antiplatelet treatment at the time of percutaneous coronary intervention (PCI). We agree that clopidogrel is recommended in patients with non‐ST segment elevation ACS (NSTEACS) whether or not an invasive approach is planned.1 The concern, however, is the timing of clopidogrel administration, which continues to be debated, with many cardiologists electing to withhold clopidogrel until angiography because of concerns about bleeding with bypass surgery.2 This approach is consistent with the treatment strategy applied in the trials included in our meta‐analysis.

We agree that troponin‐negative patients with moderate‐to‐high risk NSTEACS seem to have less benefit than troponin‐positive patients, as we have shown in a previous post hoc subgroup analysis from our dataset.3 We acknowledge, however, that the analysis was a retrospective subgroup analysis with poor power.

We appreciate the major contribution that the ISAR trials have made to clinical practice, but they differ significantly from trials included in our meta‐analysis. It is critical to avoid direct extrapolation from trials testing adjunctive treatments for PCI (as in the ISAR trials) to trials evaluating strategies of initial medical treatment with PCI performed if needed some time later (in many cases several days later). It is also particularly important to avoid scientifically inappropriate subgroup analyses, in which the subgroup is formed at variable times after the treatment allocation.4

In the patchwork of evidence from clinical trials several strategies have emerged as viable. Our meta‐analysis was meant to provide a context for clinicians choosing a strategy of initial medical treatment followed by consideration of angiography at a later date with deferred initiation of clopidogrel. We agree that our results should not be directly extrapolated beyond that point. In general, our analysis in the severe subset of our patients with NSTEACS shows a similar trend to the age analysis of the ISAR‐REACT 2 trial. We look forward to seeing the results of the analysis of the relation between age and outcomes in the four ISAR trials. Furthermore, the continuing EARLY‐ACS trial has enrolled over 6000 patients in a trial directly testing the role of eptifibatide in the setting of “upstream” clopidogrel use, with an emphasis on enrolment of an elderly population.5

We welcome further interchange and appropriate contrasts of clinical trials carried out in different circumstances in different populations.

Footnotes

Competing interests: None declared.

References

1. Bassand J P, Hamm C W, Ardissino D. et al Guidelines for the diagnosis and treatment of non‐ST‐segment elevation acute coronary syndromes. The Task Force for the Diagnosis and Treatment of Non‐ST‐Segment Elevation Acute Coronary Syndromes of the European Society of Cardiology. Eur Heart J 2007. 281598–1660.1660 [PubMed]
2. Mehta R H, Roe M T, Milgund J. et al Acute clopidogrel use and outcomes in patients with non‐ST‐segment elevation acute coronary syndromes undergoing coronary artery bypass surgery. J Am Coll Cardiol 2006. 48281–286.286 [PubMed]
3. Boersma E, Harrington R A, Moliterno D J. et al Platelet glycoprotein IIb/IIIa inhibitors in acute coronary syndromes: a meta‐analysis of all major randomised clinical trials. Lancet 2002. 359189–198.198 [PubMed]
4. Pieper K S, Tsiatis A A, Davidian M. et al Differential treatment benefit of platelet glycoprotein IIb/IIIa inhibition with percutaneous coronary intervention versus medical therapy for acute coronary syndromes. Circulation 2004. 109641–646.646 [PubMed]
5. Guigliano R P, Newby L K, Harrington R A. et al The early glycoprotein IIb/IIIa inhibition in non‐ST‐segment elevation acute coronary syndrome (EARLY ACS) trial: a randomized placebo‐controlled trial evaluating the clinical benefits of early front‐loaded eptifibatide in the treatment of patients with non‐ST‐segment elevation acute coronary syndromes—study design and rationale. Am Heart J 2005. 149994–1002.1002 [PubMed]

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