The effect of acetylsalicylic acid resistance on prognosis of patients who have developed acute coronary syndrome during acetylsalicylic acid therapy
- PMID: 17347690
- PMCID: PMC2647867
- DOI: 10.1016/s0828-282x(07)70744-4
The effect of acetylsalicylic acid resistance on prognosis of patients who have developed acute coronary syndrome during acetylsalicylic acid therapy
Abstract
Aim: The relationships between clinical events and acetylsalicylic acid resistance (AR), as well as its frequency, have been established in stable patients with coronary artery disease (CAD). Although acute coronary syndrome (ACS) patients taking acetylsalicylic acid have been accepted as a high-risk population, the role of AR has not been investigated in these patient groups. Thus, in the present study, the impact of AR was investigated in patients with ACS who were taking acetylsalicylic acid.
Methods: Between January 2001 and February 2003, 140 ACS patients were included in the present prospective study. All patients had ACS while taking acetylsalicylic acid. Coronary angiographic scores for severity and extent of CAD were determined for all patients. The effect of acetylsalicylic acid on platelet function was assessed by the platelet function analyzer PFA-100 (Dade Behring, USA). The primary end point was the composite of death, myocardial infarction, cerebrovascular accident and revascularization. The mean follow-up period was 20 months.
Results: Patients with AR were older than patients without AR (63.8+/-10.8 years versus 58.3+/-11.2 years; P=0.005). Moreover, myocardial damage was higher in patients with AR according to cardiac troponin T values (1.11+/-1.3 mug/L versus 0.41+/-0.5 mug/L; P=0.01). The composite end point of death, myocardial infarction, cerebrovascular accident or revascularization was present in 16 of 45 patients (35%) with AR and in 13 of 79 patients (16%) without AR (hazard ratio 2.46, 95% CI 1.18 to 5.13; P=0.016). After adjustment for age, platelet count, cardiac troponin T value and CAD severity score, AR remained an independent predictor for long-term adverse events (hazard ratio 3.03, 95% CI 1.06 to 8.62; P=0.038).
Conclusions: The clinical event rate was found to be higher in ACS patients with AR than in those without AR. Thus, it may be concluded that there is a strong correlation between a worse prognosis and AR in these patients.
OBJECTIF :: On a établi les liens entre les événements cliniques et la résistance à l’acide acétylsalicylique (RA), de même que la fréquence de ces événements, chez des patients stables atteints d’une coronaropathie. Bien que les patients atteints d’un syndrome coronarien aigu (SCA) qui prenaient de l’acide acétylsalicylique aient été acceptés au sein de la population très vulnérable, on n’a pas évalué le rôle de la RA auprès d’eux. On a toutefois évalué les répercussions de la RA chez les patients atteints d’un SCA qui prenaient de l’acide acétylsalicylique.
MÉTHODOLOGIE :: Entre janvier 2001 et février 2003, 140 patients atteints d’un SCA ont été inclus dans la présente étude prospective. Tous les patients souffraient de SCA pendant qu’ils prenaient de l’acide acétylsalicylique. On a établi l’indice de coronarographie en matière de gravité et d’étendue de la coronarographie chez tous les patients. On a évalué l’effet de l’acide acétylsalicylique sur la fonction plaquettaire au moyen de l’analyseur de fonction plaquettaire PFA-100 (Dade Behring, États-Unis). La valeur de seuil primaire correspondait au composite de décès, d’infarctus du myocarde, d’accident vasculaire cérébral (AVC) et de revascularisation. Le suivi moyen était de 20 mois.
RÉSULTATS :: Les patients ayant une RA était plus âgés que ceux sans RA (63,8±10,8 ans par rapport à 58,3±11,2 ans; p = 0,005). De plus, les lésions myocardiques étaient plus importantes chez les patients ayant une RA d’après les valeurs T de troponine cardiaque (1,11±1,3 μg/L par rapport à 0,41±0,5 μg/L; p = 0,01). Seize des 45 patients (35 %) ayant une RA atteignaient la valeur de seuil composite de décès, d’infarctus du myocarde, d’AVC ou de revascularisation, par rapport à 13 des 79 patients (16 %) sans RA (rapport de risque instantané [RRI] 2,46, 95 % IC 1,18 à 5,13; p = 0,016). Après rajustement compte tenu de l’âge, de la numération plaquettaire, de la valeur T de troponine cardiaque et de l’indice de gravité du SCA, la RA demeurait un prédicteur indépendant de réaction indésirable à long terme (RRI 3,03, 95 % IC 1,06 à 8,62; p = 0,038).
CONCLUSIONS :: Le taux d’événements cliniques était plus élevé chez les patients atteints d’un SCA avec une RA que chez ceux sans RA. Ainsi, on peut conclure qu’il existe une forte corrélation entre un pronostic plus négatif et la RA chez ces patients.
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Comment in
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Acetylsalicylic acid resistance and clinical outcome--the Hobikoglu study is worth noting.Can J Cardiol. 2007 Mar 1;23(3):207-8. doi: 10.1016/s0828-282x(07)70745-6. Can J Cardiol. 2007. PMID: 17347691 Free PMC article. No abstract available.
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