Abstract:
PURPOSE:To evaluate our hospital protocol of low-dose vitamin K titration for preoperative warfarin reversal for early hip fracture surgery. METHODS:Records of 16 men and 33 women aged 63 to 93 (mean, 81) years who were taking warfarin for atrial fibrillation (n=40), venous thromboembolism (n=9), cerebrovascular accident (n=3), and prosthetic heart valve (n=3) and underwent surgery for hip fractures were reviewed. The 3 patients with a prosthetic heart valve were deemed high risk for thromboembolism and the remainder low-risk. The international normalised ratio (INR) of patients was checked on admission and 6 hours after administration of vitamin K; an INR of <1.7 was considered safe for surgery. RESULTS:No patient developed venous thromboembolism within one year. The 30-day and one-year mortality was 8.2% and 32.6%, respectively. For the 46 low-risk patients, the mean INR on admission was 2.6 (range, 1.1-4.6) and decreased to <1.7 after a mean of 2.2 (range, 0-4) administrations of 2 mg of vitamin K. Their INR was <1.7 within 18 hours (mean, 14 hours). 78% of patients underwent surgery within 36 hours. In the 22% of patients who did not undergo surgery within 36 hours, the delay was due to insufficient operative time or the patient being medically unfit for surgery. The 3 high-risk patients underwent bridging therapy of low-molecular-weight heparin and received no vitamin K; their mean INR on admission was 3.2 (range, 3.1-3.3) and the mean time to surgery was 5.3 (range, 3-8) days. Two low-risk patients and one high-risk patient died within 5 days of surgery. CONCLUSION:The low-dose intravenous vitamin K protocol is safe and effective in reversing warfarin within 18 hours. Hip fracture surgery within 36 to 48 hours of admission improves morbidity and mortality.
journal_name
J Orthop Surg (Hong Kong)journal_title
Journal of orthopaedic surgery (Hong Kong)authors
Moores TS,Beaven A,Cattell AE,Baker C,Roberts PJdoi
10.1177/230949901502300108subject
Has Abstractpub_date
2015-04-01 00:00:00pages
33-6issue
1eissn
1022-5536issn
2309-4990journal_volume
23pub_type
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journal_title:Journal of orthopaedic surgery (Hong Kong)
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journal_title:Journal of orthopaedic surgery (Hong Kong)
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journal_title:Journal of orthopaedic surgery (Hong Kong)
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journal_title:Journal of orthopaedic surgery (Hong Kong)
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journal_title:Journal of orthopaedic surgery (Hong Kong)
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journal_title:Journal of orthopaedic surgery (Hong Kong)
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journal_title:Journal of orthopaedic surgery (Hong Kong)
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journal_title:Journal of orthopaedic surgery (Hong Kong)
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