Outcomes of Oral Anticoagulation with Concomitant NSAID Use: A Registry Based Cohort Study.

Background: Concomitant use of oral anticoagulants (OACs) and nonsteroidal anti-inflammatory drugs (NSAIDs) is common despite concerns about increased bleeding risk. We sought to assess the frequency of co-administering NSAIDs for patients on OAC and the impact on clinical outcomes.

Methods: We conducted a multicenter registry-based cohort study, utilizing 4:1 propensity score matching to compare patients on OAC monotherapy to those on OAC+NSAIDs therapy between 2011 and 2023 at six anticoagulation clinics of the Michigan Anticoagulation Quality Improvement Initiative.

A Comparison of Outcomes With Apixaban, Rivaroxaban, and Warfarin for Atrial Fibrillation and/or Venous Thromboembolism.

Background: Apixaban and rivaroxaban are commonly used direct oral anticoagulants for atrial fibrillation (AF) and venous thromboembolism (VTE). Both have been compared to warfarin, but there are insufficient comparative outcome data.

Objectives: The purpose of this study was to assess outcomes of apixaban, rivaroxaban, and warfarin.

Outcomes of direct oral anticoagulants with aspirin vs warfarin with aspirin: a registry-based cohort study.

Background: For patients anticoagulated with direct oral anticoagulants (DOACs) or warfarin and on aspirin (ASA) for nonvalvular atrial fibrillation and/or venous thromboembolism, it is unclear if bleeding outcomes differ.

Objectives: To assess bleeding rates for ASA with DOACs vs warfarin and one another.

Methods: Registry-based cohort study of patients followed by a 6-center quality improvement collaborative in Michigan using data from 2009 to 2022.

Assessment of an Intervention to Reduce Aspirin Prescribing for Patients Receiving Warfarin for Anticoagulation.

Importance: For some patients receiving warfarin, adding aspirin (acetylsalicylic acid) increases bleeding risk with unclear treatment benefit. Reducing excess aspirin use could be associated with improved clinical outcomes.

Objective: To assess changes in aspirin use, bleeding, and thrombosis event rates among patients treated with warfarin.

Management strategies following slightly out-of-range INRs: watchful waiting vs dose changes.

Patients' international normalized ratios (INRs) often fall slightly out of range. In these cases, the American College of Chest Physicians (ACCP) guidelines suggest maintaining the current warfarin dose and retesting the INR within the following 2 weeks (watchful waiting). We sought to determine whether watchful waiting or dose changes for slightly out-of-range INRs is more effective in obtaining in-range INRs at follow-up.

Adverse Events Associated With the Addition of Aspirin to Direct Oral Anticoagulant Therapy Without a Clear Indication.

Importance: It is unclear how many patients treated with a direct oral anticoagulant (DOAC) are using concomitant acetylsalicylic acid (ASA, or aspirin) and how this affects clinical outcomes.

Objective: To evaluate the frequency and outcomes of prescription of concomitant ASA and DOAC therapy for patients with atrial fibrillation (AF) or venous thromboembolic disease (VTE).

Design, Setting, And Participants: This registry-based cohort study took place at 4 anticoagulation clinics in Michigan from January 2015 to December 2019.

Association of Adding Aspirin to Warfarin Therapy Without an Apparent Indication With Bleeding and Other Adverse Events.

Importance: It is not clear how often patients receive aspirin (acetylsalicylic acid) while receiving oral anticoagulation with warfarin sodium without a clear therapeutic indication for aspirin, such as a mechanical heart valve replacement, recent percutaneous coronary intervention, or acute coronary syndrome. The clinical outcomes of such patients treated with warfarin and aspirin therapy compared with warfarin monotherapy are not well defined to date.

Objective: To evaluate the frequency and outcomes of adding aspirin to warfarin for patients without a clear therapeutic indication for combination therapy.

Warfarin for prevention of thromboembolism in atrial fibrillation: comparison of patient characteristics and outcomes of the "Real-World" Michigan Anticoagulation Quality Improvement Initiative (MAQI) registry to the RE-LY, ROCKET-AF, and ARISTOTLE trials.

Randomized controlled trials (RCTs) examining warfarin use for stroke prevention in atrial fibrillation (AF) may not accurately reflect real-world populations. We aimed to determine the representativeness of the RCT populations to real-world patients and to describe differences in the characteristics of trial populations from trial eligible patients in a real-world setting. We hypothesized that a significant fraction of real-world patients would not qualify for the RE-LY, ROCKET-AF, and ARISTOTLE trials and that real-world patients qualifying for the studies may have more strokes and bleeding events.

Sociodemographic factors in patients continuing warfarin vs those transitioning to direct oral anticoagulants.

Clinical factors and patient preferences are important for selecting oral anticoagulants for venous thromboembolism (VTE) and atrial fibrillation (AF). The relative association of sociodemographic factors with anticoagulant use is unknown. We evaluated a prospective cohort to compare sociodemographic variables in patients who continued on warfarin for AF or VTE to those who transitioned to 1 of the direct oral anticoagulants (DOACs).

SAMe-TTR predicts quality of anticoagulation in patients with acute venous thromboembolism: The MAQI experience.

A high SAMe-TTR score predicted poor warfarin control and adverse events among atrial fibrillation patients. However, the SAMe-TTR score has not been well validated in venous thromboembolism (VTE) patients. A cohort of 1943 warfarin-treated patients with acute VTE was analyzed to correlate the SAMe-TTR score with time in therapeutic range (TTR) and clinical adverse events.

Prescribing trends of atrial fibrillation patients who switched from warfarin to a direct oral anticoagulant.

Direct oral anticoagulant (DOAC) agents offer several lifestyle and therapeutic advantages for patients relative to warfarin in the treatment of atrial fibrillation (AF). These alternative agents are increasingly used in the treatment of AF, however the adoption practices, patient profiles, and reasons for switching to a DOAC from warfarin have not been well studied. Through the Michigan Anticoagulation Quality Improvement Initiative, abstracted data from 3873 AF patients, enrolled between 2010 and 2015, were collected on demographics and comorbid conditions, stroke and bleeding risk scores, and reasons for anticoagulant switching.

Renal function in atrial fibrillation patients switched from warfarin to a direct oral anticoagulant.

All available direct oral anticoagulants (DOACs) are at least partially eliminated by the kidneys. These agents are increasingly being used as alternatives to warfarin for stroke prevention in patients with atrial fibrillation. The aim of this study was to identify changes in renal function and associated DOAC dosing implications in a multicenter cohort of atrial fibrillation patients switched from warfarin to DOAC treatment.

The changing characteristics of atrial fibrillation patients treated with warfarin.

It has been suggested that direct oral anticoagulants are being preferentially used in low risk atrial fibrillation (AF) patients. Understanding the changing risk profile of new AF patients treated with warfarin is important for interpreting the quality of warfarin delivery through an anticoagulation clinic. Six anticoagulation clinics participating in the Michigan Anticoagulation Quality Improvement Initiative enrolled 1293 AF patients between 2010 and 2014 as an inception cohort.

The predictive ability of the CHADS2 and CHA2DS2-VASc scores for bleeding risk in atrial fibrillation: the MAQI(2) experience.

Introduction: Guidelines recommend the assessment of stroke and bleeding risk before initiating warfarin anticoagulation in patients with atrial fibrillation. Many of the elements used to predict stroke also overlap with bleeding risk in atrial fibrillation patients and it is tempting to use stroke risk scores to efficiently estimate bleeding risk. Comparison of stroke risk scores to bleeding risk scores to predict bleeding has not been thoroughly assessed.

Clinical and safety impact of an inpatient pharmacist-directed anticoagulation service.

Background: Warfarin is implicated in approximately 30% of reported anticoagulant-related errors. In order to improve anticoagulation management and safety, our institution implemented an inpatient Pharmacist-Directed Anticoagulation Service (PDAS).

Objective: To evaluate the impact of this service on both transition of care and safety of patients receiving warfarin anticoagulation.