Key result
Rapid INR target achievement post-valve surgery is linked to ~267% higher incidence of INR ≥4 without increased bleeding.
Why the study?
Limited research had evaluated the influencing factors and safety implications of promptly reaching the target INR range in patients undergoing valve replacement or repair.
What factors predict rapid achievement of target INR in patients receiving warfarin after heart valve surgery, and does rapid achievement affect safety?
Cohort (n=175)
No
What factors predict rapid achievement of target INR in patients receiving warfarin after heart valve surgery, and does rapid achievement affect safety?
Absolute Event Rate: 7.7% vs 2.1%
p-value: p=0.045
Specific patient factors (age >65, BMI <24, non-smoker, starting dose ≥3 mg/day) predict rapid achievement of target INR after valve surgery, which increases the risk of over-anticoagulation (INR ≥4) without significantly increasing bleeding.
May warrant closer INR monitoring with rapid achievement after valve surgery; leaves open optimal titration strategies pending prospective trials.
Warfarin is a commonly employed anticoagulant drug aimed at rapidly reaching the optimal international normalized ratio (INR), potentially reducing the hospitalization time in clinical settings. However, limited research has been conducted on the influencing factors and the safety implications of promptly reaching the target INR range in patients with valvular heart disease who have undergone valve replacement or repair. The present study aimed to assess the factors related to the safety considerations of rapidly reaching the target INR range in patients treated with warfarin. A retrospective cohort investigation was performed on hospitalized patients treated with warfarin between July 2022 and June 2023. Patient data were gathered from patient documentation. A total of 175 patients were included in the current study. The mean time to reach an effective INR threshold was 9.8 days (median, 3‑28 days). Age >65 years, body mass index <24 kg/m2, no smoking history and warfarin starting dose ≥3 mg/day were separate factors linked to rapidly reaching the effective INR threshold for warfarin management. The occurrence of INR levels ≥4 was significantly elevated among patients who reached the effective INR threshold more rapidly, while bleeding incidents were not significantly different. Inpatients aged >65 years, those with a body mass index <24 kg/m2, no smoking history or prescribed a starting warfarin dosage ≥3 mg/day had a higher likelihood of rapidly reaching the effective INR threshold with warfarin. To enhance safety for these patients, enhanced INR tracking and suitable warfarin dosage adjustments are suggested following the initiation of oral warfarin therapy.
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Xu et al. (2024) conducted a cohort in Valvular heart disease (n=175). Rapidly reaching the target INR range (≤7 days) vs. Slowly reaching the target INR range (>7 days) was evaluated on Incidence of INR levels ≥4 (p=0.045). Rapidly reaching the therapeutic INR target within 7 days after heart valve surgery was associated with a significantly higher incidence of INR levels ≥4 compared to slower achievement (7.7% vs 2.1%, p=0.045), with no significant difference in bleeding events.
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