Enhanced Pharmacist-Managed Anticoagulation Service in a University-based Family Medicine Clinic

Introduction:

The ambulatory care pharmacist service is a vision that is supported by several national pharmacy associations and expected by many clinical environments. However, pharmacists practicing in such settings often lack the data to demonstrate their value for the services they provide. Consequently, clinical services provided by pharmacists are not viewed as a billable expense and reimbursements are bundled with drug dispensing. Thus, if a pharmacy service is to sustain for the long-term, it is imperative to develop a value model to support monetary compensation for the cognitive services provided.

Background and Significance:

Anticoagulation with warfarin is a high risk therapy involving complex dosing, monitoring, and ensuring adherence to outpatient therapy. Monitoring anticoagulation intensity utilizing the prothrombin time (PT) and the international normalized ratio (INR) is used to determine the effectiveness of anticoagulation therapy. The proportion of time the INR is within the therapeutic range (TTR) is considered a surrogate measure of anticoagulation control and is associated with lower rates of major bleeds and thromboembolism.

Pharmacist managed anticoagulation clinics eliminate the waiting period between lab work from an external facility and decisions from physicians. Pharmacists practicing in anticoagulation clinics with point-of-care INR testing usually practice under a collaborative agreement, which allows them to adjust and reverse warfarin dosing based on established protocols. This reduces the wait time and is expected to increase patient satisfaction. Despite the wide acceptance of pharmacist-managed anticoagulation clinics, there is inconsistent evidence to support prevention of major bleeding.

Methods:

This is an IRB-approved prospective, unblinded randomized controlled trial of the clinical impact of home anticoagulation monitoring. The study will enroll all patients (who meet eligibility criteria) who require long-term anticoagulation therapy from a pharmacist-managed anticoagulation clinic.

Expected Outcomes:

The purpose of this study is to evaluate if self- monitoring in addition to pharmacist review will increase the TTR. This will allow university- based pharmacists to provide care for more patients effectively in addition to their academic duties.

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Key information

Conditions

Anticoagulation Home INR Monitoring

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Established patients within the USF Morsani Center Family Medicine department
Adults over the age of 18 years
Long-term (> 12 months) warfarin therapy
Taking warfarin for at least 90 days prior to enrollment
Willing and able to perform home INR monitoring with correct technique (or caregiver)

Exclusion criteria

Failure by either the patient or caregiver to demonstrate successful INR monitoring technique
Issues with mental and/or physical dexterity as evaluated and determined by the pharmacist
Unwillingness to take full financial responsibility for costs not covered (by patient's insurance and/or grant money) incurred with home INR monitoring

Treatment and study plan

Home INR Monitoring

Device

The self-monitoring group will monitor INR at home using the AlereTM Home Monitoring Service. They will call in the weekly results to Alere or submit online via the patient portal, which is the standard protocol among home monitoring patients. Alere will then upload the information to a password-protected HIPAA compliant website that only study investigators will be able to access. Pharmacists will have real-time access to the test results via the web interface. Pharmacists can follow up in real time if the patient forgets to self-test. An alert will also be sent to the pharmacists via email to follow up on any out of range results. This will help streamline pharmacists' workload to dedicate face-to-face time for patients that require such intervention. All home monitoring patients will be seen in clinic by the pharmacist at the end of the 3-month randomization period in order to assess compliance with meter-use and re-evaluate meter-use competency.

Other names: Alere Home INR Machine

Standard of care

Procedure

The patients in the standard of care group will have a clinic visit with the pharmacist at least once every 4 weeks or earlier, as deemed necessary by the pharmacist. The duration of the randomization period will be three months. At the end of the 3-month randomization period, patients will be provided the opportunity to cross over from the home INR monitoring group to the pharmacist-managed clinic group, or vice versa. The remainder of the study duration (post-3 month analysis) will purely be for observational purposes, in order to account for the loss of randomization and potential bias. The total duration of the study will be one year.

Primary outcomes

INR

Time frame: 12 months

INR obtained weekly via home monitoring arm. INR obtained every 4 weeks or sooner for patients seen in clinic. Two arms compared to determine time within therapeutic range.

Secondary outcomes

Patient Satisfaction and Quality of Life with Anticoagulation utilizing the Duke Anticoagulation Satisfaction Scale (DASS)

Time frame: 12 months

Patients were given the DASS survey at baseline, 3 mo (end of randomization) & end of study (12 mo), in order to assess satisfaction with warfarin therapy & management. The DASS is a validated survey, including 25 items, each containing 7 response categories: "not at all, a little, somewhat, moderately, quite a bit, a lot, & very much". Questions are arranged to correspond to 3 possible dimensions pertaining to anticoagulation: limitations, hassles & burdens, & positive psychological impacts. The DASS is able to summarize satisfaction with anticoagulation & identify aspects that may hinder individual patients from maintaining an INR within therapeutic range. Many interventions can potentially be designed to improve anticoagulation quality of care, & thus reduce the time spent outside of therapeutic range, & ultimately thromboembolic & bleeding events by identifying the limitations, hassles & burdens, as well as positive psychological impacts experienced by patients.

Sponsors and collaborators

Lead sponsor

University of South Florida

Other

Registry information

Important dates

Study start: 2016
Primary completion: 2017
Study completion: 2018
First posted: Jul 3, 2018
Registry last updated: Nov 11, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Completed