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Chronic vitamin K antagonist therapy and bleeding risk in ST elevation myocardial infarction patients
  1. Wassef Karrowni1,
  2. Tracy Y Wang2,
  3. Anita Y Chen2,
  4. Laine Thomas2,
  5. Jorge F Saucedo3,
  6. Ramzi N El Accaoui4
  1. 1UnityPoint Clinic-St Luke's Hospital, Cedar Rapids, Iowa, USA
  2. 2Duke Clinical Research Institution, Duke University Medical Center, Durham, North Carolina, USA
  3. 3NorthShore University HealthSystem, Evanston, Illinois, USA
  4. 4University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
  1. Correspondence to Dr Wassef Karrowni, Unity Point Clinic-St Luke's Hospital, 202 10th Street SE, Suite 225, Cedar Rapids, IA 52403, USA; wassef{at}hotmail.com

Abstract

Objectives Acute management of ST elevation myocardial infarction (STEMI) patients on chronic vitamin K antagonist (VKA) therapy is uncertain. This study aims to estimate in-hospital major bleeding risk among STEMI patients on chronic VKA treated with primary percutaneous coronary intervention (PCI); and determine the relationship between bleeding and acute treatments stratified by international normalised ratio (INR) values.

Methods We retrospectively examined 120 270 STEMI patients treated with primary PCI at 586 national registry hospitals (2007–2012).

Results Overall, 3101 patients (2.6%) were on VKA which was associated with increased in-hospital major bleeding risk when compared with patients not on VKA (17.0%, vs 10.1%; adjusted OR 1.26, 95% CI 1.13 to 1.40). In patients on VKA, admission INR ≥2.0 was not associated with an increase in bleeding risk compared to INR <2.0. Patients on VKA were more likely to receive clopidogrel or bivalirudin within 24 h of presentation (acute), but less likely to receive prasugrel, heparin, or glycoprotein IIb/IIIa inhibitors (GPI). In those patients, acute GPI was associated with increased bleeding risk (adjusted OR 1.92, 95% CI 1.54 to 2.40) while bivalirudin was associated with decreased risk (adjusted OR 0.69, 95% CI 0.55 to 0.86); bleeding risk associated with heparin, bivalirudin, ADP-receptor blockers, or GPI was similar between INR ≥2.0 and <2.0.

Conclusions In STEMI patients treated with primary PCI, chronic VKA therapy was associated with a significant increase in in-hospital major bleeding risk compared to no VKA therapy, irrespective of whether admission INR was ≥2.0 or not. In patients on VKA, GPI was associated with increased bleeding risk while bivalirudin was associated with decreased risk.

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