Optimal quality of vitamin K antagonist therapy in Japanese patients with venous thromboembolism.
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Hiramori Seiichi, Yamashita Yugo, Morimoto Takeshi, Kadota Kazushige, Takase Toru, Kim Kitae, Oi Maki, Akao Masaharu, Kobayashi Yohei, Toyofuku Mamoru, Inoko Moriaki, Tada Tomohisa, Izumi Toshiaki, Chen Po-Min, Murata Koichiro, Tsuyuki Yoshiaki, Saga Syunsuke, Nishimoto Yuji, Sasa Tomoki, Matsuda Mitsuo, Sakamoto Jiro, Kinoshita Minako, Togi Kiyonori, Mabuchi Hiroshi, Takabayashi Kensuke, Nakagawa Yoshihisa, Kato Takao, Ono Koh, Ando Kenji, Kimura Takeshi, COMMAND VTE Registry Investigators
Аннотация
METHODS: The COMMAND VTE Registry is a multicenter registry enrolling consecutive 3027 patients with acute symptomatic VTE among 29 centers in Japan. The current study population consisted of 1938 patients who received VKA with prothrombin time-international normalized ratio (PT-INR) measurement >5 times. The primary outcome measure was a composite of symptomatic VTE recurrence or major bleeding at 1 year. The presumed optimal quality of VKA therapy was defined as the combination of PT-INR range and time in therapeutic range (TTR) with the numerically lowest event rate.
RESULTS: The group with TTR ≥70 % based on PT-INR range ≥1.5 and <2.0 showed the lowest cumulative incidence rate. The cumulative 1-year incidence and the adjusted risk for the primary outcome measure were significantly lower in the optimal quality group than in the non-optimal quality group (5.2 % vs. 11.7 %, p = 0.001, and HR 0.49, 95%CI 0.28-0.81). Similarly, the cumulative 1-year incidences of a recurrent VTE, major bleeding, and all-cause death were significantly lower in the optimal quality group (recurrent VTE: 2.5 % vs. 6.0 %, p = 0.02; major bleeding: 2.8 % vs. 7.0 %, p = 0.008; and all-cause death: 2.8 % vs. 12.6 %, p < 0.0001). The lower risk of the optimal quality group relative to non-optimal quality group for the clinical outcomes was consistent regardless of the etiology of VTE (active cancer, transient risk factor, and unprovoked).
CONCLUSIONS: The current VTE registry showed the optimal intensity of VKA therapy was target PT-INR range ≥1.5 and <2.0, which could support the current Japanese guideline recommendation, and the good quality of control for VKA therapy of TTR ≥70 % was independently associated with better outcomes.