ABSTRAK
Latar Belakang: Antikoagulan warfarin dipakai seumur hidup pada pasien pascabedah katup jantung mekanik karena memiliki risiko tromboemboli. Dosis warfarin berlebih nilai international normalized ratio/INR di atas rentang target optimum menimbulkan efek samping perdarahan, sedangkan dosis warfarin kurang nilai INR di bawah rentang target optimum menimbulkan tromboemboli. Nilai INR optimum berbagai ras dan suku berbeda-beda. Di RS JPDHK belum pernah dilakukan studi mengenai penggunaan warfarin dan target INR optimum, padahal jumlah pasien pascabedah katup jantung mekanik semakin meningkat dari 411 pasien pada tahun 2011 menjadi 685 pasien pada tahun 2016. Penelitian ini dilakukan untuk mengetahui frekuensi efek samping perdarahan dan tromboemboli pada pasien tersebut, nilai INR optimum dan kemungkinan adanya interaksi warfarin dengan obat lain.Metode: Penelitian ini merupakan penelitian retrospektif yang diambil dari rekam medik RS JPDHK. Data frekuensi perdarahan dan tromboemboli diambil dari semua pasien yang mendapatkan terapi warfarin pascabedah katup jantung mekanik tahun 2011. Nilai INR, dosis warfarin dan kemungkinan interaksi warfarin dievaluasi pada 30 pasien perdarahan, 30 pasien tromboemboli dan 30 pasien yang tidak mengalami komplikasi melalui data rekam medik pasien bedah katup jantung mekanik sebelum tahun 2017.Hasil: Jumlah pasien yang menjalani bedah katup jantung mekanik tahun 2011 adalah 43 dan didapatkan frekuensi perdarahan mayor 11 pasien 25,6 , perdarahan minor 5 pasien 11,6 serta tromboemboli 10 pasien 23,3 . Terdapat perbedaan bermakna p.

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ABSTRACT
Background Anticoagulant warfarin is used for a lifetime in patients after mechanical valve replacement procedure because of tromboembolic risks. Warfarin should be used carefully since it has a narrow therapeutic window. Warfarin overdose INR above the target range is associated with bleeding, while underdose INR below the target range may lead to among thromboembolic complications. The optimum INR value may be different races and ethnicity. The INR value recomended by the American Heart Association AHA American College of Cardiology ACC 2017 is 2.5 3.0. In National Cardiac Center ldquo Harapan Kita rdquo Hospital no study has been carried out on the use of warfarin and the optimum INR value. Mean while, the number of patients with prosthetic mechanical valves is increasing from 450 patients in 2011 to 685 patients in 2016. This study aimed to find out the frequency of bleeding and thromboembolic complications in these patients, the optimum INR value and the possibility of interaction between warfarin and other drugs. Method In this retrospective study, the data of frequency of bleeding and thromboembolic was obtained from the medical records of patients given warfarin after mechanical heart valve replacement in 2011. The data of INR value, warfarin dose, and the possibility of interaction between warfarin and other drugs used concomittantly were evaluated in 30 patients with bleeding, 30 patients with thromboembolic and 30 patients without complication, who had mechanical heart valve replacement procedure prior to 2017.Results Out of 43 patients with mechanical heart valve replacement in 2011, the frequency of major bleeding was 11 patients 25,6 , minor bleeding was 5 patients 11,6 , and thromboembolic was 10 patients 23,3 . The INR mean level in bleeding patients group 6,32, CI95 5.2 7.7 was significantly different p