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• W2015233406 abstract "Abstract Objective: To study how mortality varies with different degrees of anticoagulation reflected by the international normalised ratio (INR). Design: Record linkage analysis with death hazard estimated as a continuous function of INR. Data sources: 46 anticoagulation clinics in Sweden with computerised medical records. Subjects: Records for 42 451 patients, 3533 deaths, and 1.25 million INR measurements. Main outcome measures: Mortality from all causes and from intracranial haemorrhage. Results: Mortality from all causes of death was strongly related to level of INR. Minimum risk of death was attained at 2.2 INR for all patients and 2.3 INR for patients with mechanical heart valve prostheses. A high INR was associated with an excess mortality: with an increase of 1 unit of INR above 2.5, the risks of death from cerebral bleeding (149 deaths) and from any cause were about doubled. Among patients with an INR of 3.0, 1069 deaths occurred within 7 weeks; if the risk coincided with that with an INR of 2.9, the expected number of deaths would have been 569. Thus at least 500 deaths were associated with a high INR value, but not necessarily caused by the treatment. Conclusions: The excess mortality associated with high INR values supports the use of less intensive treatment and a small therapeutic window, with INR close to 2.2-2.3 irrespective of the indication for anticoagulant treatment. More preventive actions should be taken to avoid episodes of high INR. What is already known on this topic The optimal degree of anticoagulation (expressed as the international normalised ratio (INR)) for different indications is still unclear, but the increased risk of death due to bleeding at high INR values is well known What this study adds This large study of medical records from anticoagulation clinics in Sweden confirmed the substantial excess mortality at high INR values and indicated optimal treatment to be in a small therapeutic window with INR close to 2.2-2.3, irrespective of the indication for anticoagulant treatment" @default.
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• W2015233406 title "Oral anticoagulation and risk of death: a medical record linkage study" @default.
• W2015233406 doi "https://doi.org/10.1016/s1062-1458(03)00033-3" @default.
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