Advantages of a Warfarin Protocol for Long-term Care Pharmacists: a Retrospective Cohort Study

Interprofessional collaboration between prescribers, managers, nursing staff and on-site pharmacists within residential aged care facilities: a mixed-methods study

BACKGROUND

A new on-site pharmacist (OSP) intervention within residential aged care facilities (RACFs) is being investigated to help improve medication management. Interprofessional collaboration amongst prescribers, nursing staff and pharmacists is critical to improving RACF medication management.

OBJECTIVE

To explore the extent of interprofessional collaboration and the nature of the working relationships between OSPs and prescribers, managers and nursing staff.

METHODS

A mixed-methods study was undertaken within the context of a 12-month cluster randomised controlled trial. Semi-structured interviews were conducted with data analysed using framework analysis, and a survey based upon the Physician-Pharmacist Collaboration Index (PPCI) was distributed at two time points (T1 at 3 months and T2 at 9 months after OSP commencement) across seven intervention RACFs.

RESULTS

The qualitative data (n = 33 interviews) findings related to the processes supportive of these relationships e.g. on-site proximity, OSP personality and perceived (or beneficial) benefits of OSPs working with health care team members (such as OSPs being trusted and providing reassurance to RACF health care team members). The PPCI survey mean scores at T1 (n = 33) and T2 (n = 19) suggested that OSPs were able to establish positive working relationships at 3 months and that positive relationships also existed at 9 months. The integrated findings suggested that the working relationships between OSPs and health care team members were generally positive.

CONCLUSIONS

This study is the first to explore interprofessional collaboration between OSPs and health-care team members in RACFs. The findings suggest that OSPs can positively contribute to interprofessional collaborative care within RACFs.

Treatment Satisfaction Questionnaire for Medication: Validation of the Translated Arabic Version among Patients Undergoing Warfarin Therapy in Saudi Arabia

OBJECTIVES

To validate the psychometric properties of the translated Arabic version of the Treatment Satisfaction Questionnaire for Medication (TSQM 1.4) for patients on warfarin therapy in Saudi anticoagulation clinics (ACCs).

METHODS

A cross-sectional survey was conducted at the Security Forces Hospital ACC in Riyadh, Saudi Arabia. It involved administering questionnaires related to patients' satisfaction and assessing adherence through interviews. The quality of the international normalized ratio control was assessed using the Rosendaal method. A psychometric evaluation of TSQM 1.4 was carried out, addressing internal consistency and known-groups and convergent validity.

RESULTS

A total of 101 patients completed the questionnaire with an 80% response rate. The independent Cronbach α values for the effectiveness, side effects, and global satisfaction domains were consistently higher than 0.75, demonstrating good internal consistency and suitability of these domains for application in the current patients' setting. When these domains were used together in a multivariable logistic regression model of adherence, the only domain that remained significant was TSQM effectiveness (P = 0.017). Interestingly, a higher likelihood of moderate to optimal international normalized ratio control was significantly and independently associated with increased satisfaction scores in the effectiveness and convenience domains, but not in the side effects and global satisfaction domains.

CONCLUSIONS

This study provides evidence in favor of the reliability and validity of the Arabic version of TSQM 1.4 as a useful measure of satisfaction with anticoagulant therapy in patients visiting ACCs. The TSQM subscales in this patient setting seem to detect a clinically meaningful change over time, enhancing the potential of their use in routine practice.

Validation of knowledge and adherence assessment tools among patients on warfarin therapy in a Saudi hospital anticoagulant clinic

Background Although it can result in serious complications due to its narrow therapeutic index, warfarin is widely used in the treatment and prevention of thromboembolic disorders. However, patients' adherence and knowledge are determinants of therapeutic success. Objective We sought to validate instruments to provide a reliable means of identifying gaps in patient understanding and nonadherence to inform targeted pharmacists' interventions to improve these measures. Methods A cross-sectional survey was conducted. Patients' knowledge about warfarin was rated using an Arabic-language tool. Medication adherence was assessed using the eight-item Morisky Medication Adherence Scale (MMAS-8). The international normalized ratio (INR) control was quantified by the Rosendaal Method. Setting At the Security Forces hospital anticoagulant clinic (ACC), Riyadh. Main outcome measure Validity of a Knowledge and adherence tool. Results Totally, 101 patients completed the questionnaires. Interestingly, the knowledge tool demonstrated good internal consistency (total Cronbach's alpha = 0.75) and significant concurrent validity with adherence levels. Fifty-two patients were classified as having unsatisfactory knowledge. Deficiency in knowledge was most obvious with respect to the consequences of missing a dose and when to seek immediate medical attention. The MMAS-8 had moderate reliability (Cronbach's alpha = 0.65); however, its concurrent validity with good INR control was not demonstrated. Conclusions This study revealed high prevalence of nonadherence and poor knowledge in the population visiting the ACC. Given that available knowledge and adherence tools seemed to have little validity in predicting clinical outcomes, structured tools should be designed, considering progression in clinical outcomes with future pharmacists' interventions.

Application of a Simulation Model to Estimate Treatment Error and Clinical Risk Derived from Point-of-Care International Normalized Ratio Device Analytic Performance

BACKGROUND

In 2016, the Food and Drug Administration (FDA) proposed to enhance performance expectations for point-of-care testing (POCT) international normalized ratio (INR) devices relative to International Organization for Standardization (ISO) 17593:2007. The objective of the study was to estimate the frequency of warfarin dosing errors associated with a central laboratory INR method, a POCT INR method, and the proposed FDA performance goals.

METHODS

A data set of INR results (n = 51912) from adult patients with INR ≤4 was used to assess the influence of adding assay imprecision and bias on warfarin dose decisions. The frequency of error in warfarin dose and size of error (≥1 or ≥2 dose categories) was compared using published assay specifications for the Instrumentation Laboratory ACL TOP® and the Roche Diagnostics CoaguChek® XS relative to the proposed FDA guidelines.

RESULTS

The frequency of warfarin dose misclassification was largely influenced by bias and was not sensitive to assay imprecision. The central laboratory and POCT INR methods met the FDA performance specifications, had equal rates of ≥2 warfarin dose category error, and had statistically different rates of ≥1 warfarin dose category error in large samples (n >250).

CONCLUSIONS

Simulation models are useful tools for evaluating POCT INR assay performance criteria required to achieve the proposed FDA guidelines. This simulation depicted how the Roche Diagnostics CoaguChek XS instrument meets the guideline.

The June Issue of the CGJ

-