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vol.33 issue1Nitroprusside: A Reliable Drug For Fractional Flow Reserve AssessmentFactors determining inadequate INR values in patients receiving chronic anticoagulant treatment with vitamin K antagonists author indexsubject indexarticles search
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Revista chilena de cardiología

On-line version ISSN 0718-8560


MARIN, Arnaldo et al. Safety and efficacy of anticoagulation with vitamin K antagonists in patients with prosthetic heart valves. Rev Chil Cardiol [online]. 2014, vol.33, n.1, pp.27-32. ISSN 0718-8560.

Background: Patients with cardiac mechanical valves (MHV) represent a significant proportion of all patients requiring anticoagulation. However, there are few studies comparing safety and efficacy of different vitamin K antagonists (VKA). Aim: To compare the efficacy and safety of warfarin and acenocoumarol in patients with MHV. Methods: Observational study of patients who had a mitral and /or aortic valve replacement between 2005 and 2013, followed at the Catholic University anticoagulation clinics. VKA dose adjustments were performed using the Isaza Hytwin Biostac 2.0 software. Major and minor bleeding (safety) and stroke and systemic embolism (effectiveness) were evaluated. The efficacy was estimated by the time in therapeutic range (TTR) with the Rosendaal method. Results: 365 patients were included with a mean age of 64.1 ± 13.2 years, 53.9% of them were females. Mean follow-up was 33.3 ± 18 months Overall mortality rate was 2.1%, which is similar to that of patients treated with VKA for other reasons. The average TTR was 68 ± 13.3% (66,1 ± 12,6% for aortic valves, 65,8 ± 13,8% for mitral valves and 61,2 ± 12% for aortic and mitral valves). TTR was lower with acenocoumarol compared to warfarin (65.1 ± 13.1 vs. 71.2 ± 13.6 , p = 0.001 ), However, the risk of complications was not different between groups. Conclusions: Although warfarin provides a better profile of TTR , there were no significant differences in efficacy or safety when compared with acenocoumarol.

Keywords : anticoagulant treatment; vitamin K antagonists; cardiac valve prosthesis.

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