Pharmacists' role in handling problems with prescriptions for antithrombotic medication in Belgian community pharmacies

Drug-related problems associated with direct oral anticoagulants: an observational cross-sectional study of medical record review by pharmacists in a large teaching hospital

Background

Prescribing DOACs presents with challenges in the elderly and patients with renal and hepatic impairment. To mitigate safety risks, pharmacists have a role in detection, prevention, and resolution of DOAC-associated drug-related problems (DRPs).

Objectives

To identify the types of DOAC-associated DRPs in patients on DOAC therapy and factors that predispose patients to DOAC-associated DRPs.

Methods

An observational cross-sectional study was conducted in SGH from January 1, 2017, to May 31, 2019, on patients prescribed with a DOAC (rivaroxaban, dabigatran, and apixaban). Data were electronically extracted for patient demographics, clinical characteristics, and details of DOAC-related DRPs identified by pharmacists. Matching of DRP group to non-DRP group at a ratio of 1:2 based on gender, race, and DOAC was performed. The DRP group included patients with detected DRPs while non-DRP group included patients without them. Descriptive analysis was used to summarize patient characteristics and types of DOAC-associated DRPs. In the matched population, conditional logistic regression was used to calculate unadjusted (UOR) and adjusted odds (AOR) ratio to detect association of DOAC-associated DRPs with age, renal function, ≥2 comorbidities, and DOAC indication (atrial fibrillation [AF] vs venous thromboembolism).

Results

A total of 8432 patients prescribed DOACs were analyzed, which consisted of 827 (9.8%) and 7602 (90.2%) patients with DRPs and no DRPs, respectively. The top DOAC-associated DRP was inappropriate drug regimen (n = 487, 60.1%). After matching, 2403 patients were analyzed, consisting of 801 patients from DRP group and 1602 from non-DRP group. Factors associated with DOAC-associated DRPs were statistically significant for renal function at creatinine clearance (CrCl) of >30 to 50 mL/min/1.73 m2 (AOR: 1.42; 95% CI: 1.14-1.76; P = .002), 15 to 30 mL/min/1.73 m2 (OR: 1.94; 95% CI: 1.42-2.66; P < .001), and <15 mL/min/1.73m2 (OR: 2.35; 95% CI: 1.13-4.88; P = .022), respectively, compared with a CrCl of >50 mL/min/1.73 m2 and DOAC indication for AF (AOR: 1.84; 95% CI: 1.47-2.30; P < .001) compared with venous thromboembolism.

Conclusion

Inappropriate drug regimen was the most common DOAC-associated DRP. Impaired renal function and patients with AF increased the likelihood of DOAC-associated DRPs.

Comparing the Prevalence of Polypharmacy and Potential Drug-Drug Interactions in Nursing Homes and in the Community Dwelling Elderly of Emilia Romagna Region

Backround: We aimed at assessing the prevalence of polypharmacy and potential drug-drug interactions (DDIs) with clinical relevance in elderly patient on Emilia Romagna area. Both outpatients and residents in nursing homes were assessed, with only partially overlapping strategies.

Methods: We defined a list of 190 pairs of potentially interacting drugs, based on literature appraisal and availability of therapeutic alternatives. January-June 2018 data on drug use in patients over 65 years-old were collected from nine Local Health Authorities of Emilia Romagna: data on community-dwelling subjects were extracted from archives of reimbursed prescriptions, while drug use in a sample of nursing homes was recorded from clinical charts in one index day within the same semester. The frequency of polypharmacy (at least five or at least 10 concurrent drugs) and of each DDI was calculated.

Results: In line with different rates of polypharmacy (80% vs 16%), the risk of exposure to at least one interaction was 53.7% in nursing homes and 26.4% in outpatients. Among DDIs, in nursing homes antidepressants—anxiolytics (11.9%) ranked first, followed by antidepressants—aspirin (7.4%). In outpatients, ACE-inhibitors—non-steroidal anti-inflammatory drugs (NSAIDs) reached 7.2% followed by the calcium channel blockers—α-blockers (2.4%).

Discussion: Polypharmacy and risk of DDIs appeared very different in the two settings, due to both technical and clinical reasons. In order to reduce use of benzodiazepines, NSAIDs, antidepressants and relevant DDIs, 1) defining alternative options for pain relief in elderly outpatients, and 2) implementing non-pharmacological management of insomnia and anxiety in nursing homes should be prioritized.

The patient pathway in cardiovascular care: A position paper from the International Pharmacists for Anticoagulation Care Taskforce (iPACT)

BACKGROUND

This position paper highlights the opportunistic integral role of the pharmacist across the patient pathway utilizing cardiovascular care as an example. The paper aims to highlight the potential roles that pharmacists worldwide can have (or already have) to provide efficient patient care in the context of interprofessional collaboration.

METHODS

It results from a literature review and experts seeking advice to identify existing interventions and potential innovative interventions. We developed a conceptual framework highlighting seven critical phases in the patient pathway and for each of those listed some of the initiatives identified by our experts worldwide.

RESULTS

Existing pharmacists' interventions in each of these phases have been identified globally. Various examples in the area of prevention and self-management were found to exist for long; the contribution for early detection and subsequently to timely diagnosis were also quite clear; integration of care was perhaps one of the areas needing greater development, although interventions in secondary care were also quite common. Tertiary care and end of life interventions were found to often be left for other healthcare professionals.

CONCLUSION

On the basis of the findings, we can argue that much has been done but globally consider that pharmacists are still an untapped resource potentially useful for improved patient care.

Creating an Interprofessional guideline to support patients receiving oral anticoagulation therapy: a Delphi exercise

Background Oral anticoagulation therapy has proven beneficial impact on the prevention of thromboembolic events. However, the use of antocoagulatns also increases the risk of bleeds. To maximize the benefits and minimize the risks of the treatment, guidance on appropriate use of oral anticoagulants is essential. An international guideline describing relevant components and requirements for pharmaceutical care for patients receiving a therapy woth oral antocoagulants would increase the quality of care. However, recommendations on pharmaceutical care for patients on anticoagulation is lacking. Objective This study aims to develop an interprofessional guideline to support patients in their use of oral anticoagulation therapy. Method Two systematic literature searches were performed on existing guidelines on the management and interventions to improve-oral anticoagulant use, to generate possible recommendations. Subsequently, an international expert panel with 26 pharmacists with extensive experience in clinical and/or scientific work on anticoagulation from a total of 22 European and 4 non-European countries was constituted. With this (geographically well distributed) expert panel, a four-round internet-based Delphi technique was conducted to reach consensus on their relevance. Items were ranked on a 1–10 scale of agreement. A median agreement score of ≥ 7.5 was considered the threshold for consensus. Levels of importance were rated on a 1–3 scale. Setting A global network of 26 pharmacists specialized in oral antocoagulation therapy. Main outcome measure Development of inter-professional guideline. Results After the four Delphi rounds 18 guideline recommendations were formulated. Consensus of opinion was achieved for all recommendations (median agreement: 8.5–10.0), whereas mean levels of importance were between 1.1 and 2.0 (SD: 0.2–0.7). The following domains were rated as most important targets for improving the care around oral anticoagulation: ‘INR-monitoring’, ‘Transfer of care between health care settings’, ‘Adherence to medication’, ‘Patient communication and engagement’, and ‘Medication reconciliation and medication review’. Conclusion The 18 recommendations included in this guideline provide the base for optimization of anticoagulation care across different countries/healthcare systems. Future work involves translating the guideline recommendations into clinical practice. Once implemented, the recommendations of the guideline will support health care providers with the pharmaceutical care for patients on, oral anticoagulation which will improve the effective and safe use of these medicines.

Preventability of serious thromboembolic and bleeding events related to the use of oral anticoagulants: a prospective study

AIMS

To determine the preventability of serious adverse drug reactions (ADRs) related to the use of direct oral anticoagulants (DOACs), and to explore contributing factors to preventable ADRs. Results were compared with vitamin K antagonists (VKAs).

METHODS

We conducted a prospective observational study in the emergency departments of two teaching hospitals from July 2015 to January 2016. Patients admitted with a thrombotic or bleeding event while under DOAC or VKA were included. Four independent reviewers assessed causality, seriousness and preventability of ADRs using pilot-tested scales. For cases of serious and potentially preventable ADRs, we performed semi-structured interviews with general practitioners to identify contributing factors to ADRs. The primary outcome was the proportion of serious ADRs that were potentially preventable.

RESULTS

The analysis included 46 DOAC and 43 VKA patients (median age 79 years). Gastrointestinal (n = 34) and intracranial (n = 16) bleedings were the most frequent ADRs. Results were that 53% of DOAC- and 61% of VKA-related serious ADRs were deemed potentially preventable. Prescribing issues and inadequate monitoring were frequent for DOAC and VKA respectively. We identified many causes of preventable ADRs that applied to all oral anticoagulants, such as pharmacodynamic drug interactions and lack of communication.

CONCLUSIONS

More than half of serious ADRs were potentially preventable for both DOACs and VKAs. Interventions focusing on prescribing, patient education and continuity of care should help improve the use of DOACs in practice.

Pharmaceutical interventions on prescribed medicines in community pharmacies: focus on patient-reported problems

Background While dispensing prescribed medicines, pharmacists frequently encounter technical and clinical problems that require a pharmaceutical intervention. Objective To describe the pharmaceutical interventions performed by community pharmacists while dispensing prescribed medicines and to investigate, in-depth, the patient-reported problems with the prescribed medicines that triggered pharmaceutical interventions. Method Twenty-one pharmacists each collected 30 prescriptions requiring a pharmaceutical intervention on five selected days within a five-week period. All pharmaceutical interventions were classified using the PharmDISC system. Results Of all 430 pharmaceutical interventions, 286 (66.5%) pharmaceutical interventions had a clinical cause and 144 (33.5%) pharmaceutical interventions a technical cause. Pharmacists mainly intervened to substitute a drug (n = 132, 30.7%), adjust a dose (n = 57, 13.3%), and clarify/complete information (n = 48, 11.2%). A total of 243 (56.5%) pharmaceutical interventions resulted in a change of the prescription. The implementation rate of pharmaceutical interventions reached 88.6%. Altogether, patient-reported problems triggered 99 (23.0%) pharmaceutical interventions. In 15 (15.2%) of these PIs, contact with the prescriber was necessary, whereas 61 (84.8%) PIs only involved the pharmacist. Conclusion While dispensing prescribed medicines, pharmacists performed individualised pharmaceutical interventions to solve or prevent drug-related problems. That almost a quarter of all pharmaceutical interventions triggered by patient-reported problems highlights the importance of direct patient-pharmacist interaction when dispensing prescribed medicines.

Inappropriate prescribing of antithrombotic therapy in Ethiopian elderly population using updated 2015 STOPP/START criteria: a cross-sectional study

Background

Inappropriate use of antiplatelets and anticoagulants among elderly patients increases the risk of adverse outcomes. The aim of this study was to assess the prevalence of inappropriate prescribing of antithrombotic therapy in hospitalized elderly patients.

Methods

A retrospective cross-sectional, single-center study was conducted at the Gondar University Hospital. A total of 156 hospitalized elderly patients fulfilling the inclusion/exclusion criteria were included in the study. The Screening Tool for Older Person’s Prescription/Screening Tool to Alert doctors to Right Treatment criteria version 2 were applied to patients’ data to identify the total number of inappropriate prescribing (IPs) including potentially inappropriate medications and potential prescribing omissions.

Results

A total of 70 IPs were identified in 156 patients who met the inclusion criteria. Of these, 36 (51.4%) were identified as potentially inappropriate medications by the Screening Tool for Older Person’s Prescription criteria. The prevalence of IP per patient indicated that 58 of the 156 (37.2%) patients were exposed to at least one IP. Of these, 32 (55.2%) had at least one potentially inappropriate medication and 33 (56.9%) had at least one potential prescribing omission. Patients hospitalized due to venous thromboembolism (adjusted odds ratio [AOR] =29.87, 95% confidence interval [CI], 1.26–708.6), stroke (AOR =7.74, 95% CI, 1.27–47.29), or acute coronary syndrome (AOR =13.48, 95% CI, 1.4–129.1) were less likely to be exposed to an IP. An increase in Charlson comorbidity index score was associated with increased IP exposure (AOR =0.60, 95% CI, 0.39–0.945). IPs were about six times more likely to absent in patients prescribed with antiplatelet only therapy (AOR =6.23, 95% CI, 1.90–20.37) than those receiving any other groups of antithrombotics.

Conclusion

IPs are less common in elderly patients primarily admitted due to venous thromboembolism, stroke, and acute coronary syndrome, and those elderly patients prescribed with only antiplatelet. Patients with higher Charlson comorbidity index were, however, associated with increased IPs exposure. Our study may guide further research to reduce high-risk prescription of antithrombotics in the elderly.