Anticholinergic medicines in an older primary care population: a cross-sectional analysis of medicines' levels of anticholinergic activity and clinical indications

The effect of the anticholinergic burden on mortality following elective cardiac surgery

OBJECTIVE

The cumulative effect of drugs with anticholinergic properties may pose a significant risk in the post-discharge period of patients who have undergone elective cardiac surgery. The aim of this study was to investigate the association between anticholinergic burden and 6-month postdischarge mortality in older cardiac surgery patients.

METHODS

This study performed a retrospective longitudinal analysis of patients undergoing elective cardiac surgery at a tertiary care centre from January 2021 to January 2022. The Deyo-Charlson comorbidity index (D-CCI) was used to estimate the burden of comorbidities. The anticholinergic burden was assessed using the Anticholinergic Cognitive Burden scale (ACB) and Drug Burden Index (DBI) scale. All-cause postdischarge mortality was determined from electronic medical records.

RESULTS

A total of 255 older adults who had undergone elective cardiac surgery and had been followed up for at least 6 months were included in this study. Approximately 12.5% (n = 32) of older patients died within 6 months of discharge. In multivariate Cox regression analysis, ACB (HR:1.31, 95%CI:1.10-1.56 p = 0.01) and DBI (HR:2.08, 95%CI:1.27-3.39 p = 0.01) showed significantly increased risk of 6-month postdischarge mortality after adjusting for several possible confounders (age, gender, D-CCl, and American Society of Anaesthesiologists (ASA) score). Overall event-free survival differed significantly between patients undergoing cardiac surgery based on anticholinergic burden according to the group-stratified ACB and DBI scales (χ2: 5.907, log-rank test, p = 0.015 and χ2: 15.389, log-rank test, p < 0.001 respectively).

CONCLUSION

The anticholinergic burden is associated with 6-month all-cause post-discharge mortality in older cardiac surgery patients. A deprescribing approach should be considered, especially for older adults in the perioperative period.

TRIAL REGISTRATION

The trial was retrospectively registered at ClinicalTrials.gov. Identifier: NCT05312684 Registered on 5 April 2022.

Anti-Cholinergic Drug Burden Among Ambulatory Elderly Patients in a Nigerian Tertiary Healthcare Facility

Background: The use of drugs with anticholinergic effects among elderly patients is associated with adverse clinical outcomes. There is paucity of information about anticholinergic drug burden among Nigerian elderly population. Objectives: To determine the anticholinergic drug burden among elderly Nigerian patients. Methods: This was a retrospective cross-sectional study conducted among elderly patients (aged 65 and above) who visited the Family Medicine outpatients' clinics of the Ekiti State University Teaching Hospital, Ado-Ekiti, Nigeria between July 1 and October 31, 2018. Information extracted from the case files included patient's age, sex, diagnoses, and list of prescribed medications. Medicines with anticholinergic effects were identified and scored using the anticholinergic drug burden calculator (http://www.acbcalc.com). Results: The medical records of 400 patients were analyzed with females accounting for 60.5% of the study population. The mean age of participants was 73 ± 7.4 years with only 28 (7%) of patients having more than two co-morbid conditions. Polypharmacy was identified in 152 (38%) of the patients while 147 (36.7%) had drugs with anticholinergic effects prescribed. The anticholinergic burden was high in 60 (15%) patients. Polypharmacy was significantly associated with having more than two diagnosed conditions and high anticholinergic burden (p value of < 0 .001 and 0.013 respectively). There was significant correlation between total number of prescribed drugs and count of diagnoses (r = 0.598; p < 0 .000) and between total number of prescribed drugs and number of drugs with anticholinergic effects (r = 0 .196; p < 0 .000). Conclusion: The anticholinergic burden in this group of elderly Nigerian patients was low; majority (67%) had no exposure to drugs with anticholinergic effects with only 15% having high anticholinergic burden. Polypharmacy and multiple diagnosed conditions were positively associated with high anticholinergic burden. Based on the positive and significant correlations found in this study, a reduction in the number of prescribed medicines especially those with significant anticholinergic effects used for secondary indications may lessen the anticholinergic burden among the elderly.

Stability of anticholinergic load in Australian community-dwelling older people: a longitudinal analysis

BACKGROUND

It is recommended that anticholinergic medication is avoided in older people, especially those with cognitive impairment.

OBJECTIVE

To investigate anticholinergic load (ACL) over time in older primary care patients with and without cognitive impairment.

METHODS

Community-dwelling general practice patients at baseline (n = 1768), at year one (n = 1373) and a restricted cohort (with possible or definite cognitive impairment) at year two (n = 370) had medication regimens documented by a research nurse during a home visit. Anticholinergic medicines were categorized as levels 1-3 (low-high potency) and summed for each participant as a measure of their ACL.

RESULTS

Most participants had no change in ACL over time, but there was some turnover in the anticholinergic medications used. The mean change in ACL was 0.012 ± 0.99 from baseline to 12 months and -0.04 ± 1.3 from baseline to 24 months. Cardiovascular drugs were the most commonly used level 1 anticholinergics, followed by antidepressants and opioids. Antidepressants and urologicals were the most commonly used level 3 anticholinergics. The rate of anticholinergic deprescribing was equivalent to the rate of anticholinergic initiation, and commonly involved the level 1 drugs warfarin, furosemide and temazepam, and the level 3 drugs amitriptyline and oxybutynin. People with dementia had a higher ACL at baseline and year one compared with other participants.

CONCLUSION

ACL of community-dwelling older people was very stable over time. This may represent lost opportunities for deprescribing as well as potentially inappropriate prescribing, particularly in those with cognitive impairment.

Potentially inappropriate medications for older adults in a primary healthcare unit in southern Brazil

Background Potentially inappropriate medications for older adults are those that offer more risks than benefits for this population. Such medications found in older adults' prescriptions across the world are associated with higher rates of comorbidities and hospitalizations, along with high expenditure on healthcare resources. Objectives To estimate the frequency of older adults using potentially inappropriate medications according to four different criteria, to identify factors associated with the use of such medicines and differences between the tools. Setting A primary healthcare unit linked to a university hospital in Porto Alegre, Brazil. Method This was a cross-sectional study conducted via data collection from the electronic medical records of 390 older adults. The information collected comprised sex, age, chronic diseases diagnosed and medications used. The dependent variable of the study was the use of at least one potentially inappropriate medication, according to the following criteria: Beers, Screening Tool of Older Persons' Prescriptions (STOPP), Brazilian consensus and Anticholinergic Risk Scale (ARS). Main outcome measurement Prevalence of inappropriate medication, differences between the tools and associated factors. Results: The use of at least one potentially inappropriate medication was found in 55.1% of the sample according to the Beers criterion, 51.3% according to the Brazilian consensus, 42.6% according to STOPP and 23.6% according to ARS. It was also seen that 14.9% of the studied population was exposed to a very strong anticholinergic risk. Depending on which tools were used, the agreement observed between the criteria was considered high, moderate, or low. Regarding the four criteria, the use of potentially inappropriate medication is associated with polypharmacy, the diagnosis of three or more chronic diseases and the presence of neuropsychiatric and musculoskeletal diseases. Conclusion Among the older adult population studied, the prevalence of potentially anappropriate medication is high, according to the four different classification criteria used. As a more specific tool, the agreement between Anticholinergic Risk Scale and other criteria was lower, but it can be an important complement to other lists.

Adverse drug reactions associated with amitriptyline - protocol for a systematic multiple-indication review and meta-analysis

BACKGROUND

Unwanted anticholinergic effects are both underestimated and frequently overlooked. Failure to identify adverse drug reactions (ADRs) can lead to prescribing cascades and the unnecessary use of over-the-counter products. The objective of this systematic review and meta-analysis is to explore and quantify the frequency and severity of ADRs associated with amitriptyline vs. placebo in randomized controlled trials (RCTs) involving adults with any indication, as well as healthy individuals.

METHODS

A systematic search in six electronic databases, forward/backward searches, manual searches, and searches for Food and Drug Administration (FDA) and European Medicines Agency (EMA) approval studies, will be performed. Placebo-controlled RCTs evaluating amitriptyline in any dosage, regardless of indication and without restrictions on the time and language of publication, will be included, as will healthy individuals. Studies of topical amitriptyline, combination therapies, or including < 100 participants, will be excluded. Two investigators will screen the studies independently, assess methodological quality, and extract data on design, population, intervention, and outcomes ((non-)anticholinergic ADRs, e.g., symptoms, test results, and adverse drug events (ADEs) such as falls). The primary outcome will be the frequency of anticholinergic ADRs as a binary outcome (absolute number of patients with/without anticholinergic ADRs) in amitriptyline vs. placebo groups. Anticholinergic ADRs will be defined by an experienced clinical pharmacologist, based on literature and data from Martindale: The Complete Drug Reference. Secondary outcomes will be frequency and severity of (non-)anticholinergic ADRs and ADEs. The information will be synthesized in meta-analyses and narratives. We intend to assess heterogeneity using meta-regression (for indication, outcome, and time points) and I2 statistics. Binary outcomes will be expressed as odds ratios, and continuous outcomes as standardized mean differences. Effect measures will be provided using 95% confidence intervals. We plan sensitivity analyses to assess methodological quality, outcome reporting etc., and subgroup analyses on age, dosage, and duration of treatment.

DISCUSSION

We will quantify the frequency of anticholinergic and other ADRs/ADEs in adults taking amitriptyline for any indication by comparing rates for amitriptyline vs. placebo, hence, preventing bias from disease symptoms and nocebo effects. As no standardized instrument exists to measure it, our overall estimate of anticholinergic ADRs may have limitations.

SYSTEMATIC REVIEW REGISTRATION

Submitted to PROSPERO; assignment is in progress.

Association between anticholinergic drug prescription changes and rehabilitation outcome in post-acute hip fractured patients

Purpose: To follow changes in anticholinergic drug prescriptions throughout hip fractured patients' rehabilitation; to assess whether a change in anticholinergic burden affects rehabilitation outcome.Methods: Retrospective study of 869 hip fractured patients admitted between January 2011 to October 2015, performed in a post-acute geriatric rehabilitation center. The Anticholinergic Cognitive Burden Scale quantified the anticholinergic burden. Main outcome measures: Functional Independence Measure, motor Functional Independence Measure, Montebello Rehabilitation Factor Score on motor Functional Independence Measure and length of stay. Multiple linear regression analysis tested for independent association between admission anticholinergic burden and anticholinergic burden change during rehabilitation, and rehabilitation outcomes.Results: One hundred and sixty two (18.7%) patients were prescribed additional anticholinergic medications upon discharge; 76 (8.7%) were prescribed fewer. Patients with high admission anticholinergic burden presented with a significantly higher rate of higher education, less likely to reside at home, less independent pre-fracture, exhibited a significantly lower admission and discharge Functional Independence Measure score, a lower Functional Independence Measure score change and a lower Montebello Rehabilitation Factor Score. Admission anticholinergic burden, but not changes in anticholinergic burden during rehabilitation, was found to be independently associated with rehabilitation outcome (discharge FIM score).Conclusions: High admission anticholinergic burden is associated with lower functional ability in hip fractured patients. Changes in anticholinergic drug prescription during rehabilitation were not associated with rehabilitation outcomes.Implications for rehabilitationClinicians should make an effort to reduce AC drug use in hip fractured patients on admission to post-acute rehabilitation.AC burden should be carefully monitored throughout the rehabilitation period and reduced whenever possible.When functional ability does not improve as expected, AC burden should be considered as an intervening factor.

Anticholinergic Burden and Most Common Anticholinergic-acting Medicines in Older General Practice Patients

Introduction

Anticholinergic burden in older adults has been correlated with cognitive decline, delirium, dizziness and confusion, falls and hospitalisations. Nevertheless, anticholinergic-acting medications remain commonly prescribed in up to a third of older adults in primary care population. Our aim was to study the anticholinergic burden in older adults in Slovenian ambulatory setting and explore the most commonly involved medications which could be avoided by the physicians.

Methods

A cross-sectional study was conducted in 30 general practices in Slovenia as part of a larger trial. Data on prescribed medications were collected for randomly chosen adults of over 65 years of age visiting general practice, who were taking at least one regularly prescribed medication. Anticholinergic burden was calculated using Duran’s scale and Drug Burden Index.

Results

Altogether, 622 patients were included, 356 (57.2%) female, average age of 77.2 (±6.2), with an average of 5.6 medications. At least one anticholinergic medication was present in 78 (12.5 %) patients. More than half (N=41, 52.6%) of anticholinergic prescriptions were psychotropic medications. Most common individual medications were diazepam (N=10, 1.6%), quetiapine (N=9, 1.4%) and ranitidine (N=8, 1.3%).

Conclusions

Though the prevalence of anticholinergic medications was low compared to international research, the most commonly registered anticholinergic prescriptions were medications that should be avoided according to guidelines of elderly prescriptions. It would be probably clinically feasible to further decrease the anticholinergic burden of older adults in Slovenian primary care setting by avoiding or replacing these medications with safer alternatives.

Anticholinergic Exposure in a Cohort of Adults Aged 80 years and Over: Associations of the MARANTE Scale with Mortality and Hospitalization

Anticholinergics are frequently prescribed for older adults and can lead to adverse drug events. The novel MARANTE (Muscarinic Acetylcholinergic Receptor ANTagonist Exposure) scale measures the anticholinergic exposure by incorporating potency and dosages of each medication into its calculations. The aims were to assess prevalence and intensity of the anticholinergic exposure in a longitudinal cohort study of community-dwelling patients aged 80 years and over (n = 503) and to study the impact on mortality and hospitalization. Chronic medication use at baseline (November 2008-September 2009) was entered and codified with the Anatomical Therapeutic Chemical classification. Time-to-event analysis until first hospitalization or death was performed at 18 months after inclusion, using Kaplan-Meier curves. Cox regression was performed to control for covariates. Mean age was 84 years (range 80-102), and mean number of medications was 5 (range 0-16). Prevalence of anticholinergic use was 31.8%, with 9% taking ≥2 anticholinergics (range 0-4). Main indications for anticholinergics were depression, pain and gastric dysfunction. Female gender, the level of multi-morbidity and the number of medications were associated with anticholinergic use. Mortality and hospitalization rate were 8.9% and 31.0%, respectively. After adjustment for the level of multi-morbidity and medication intake, multi-variable analysis showed increased risks of mortality (HR 2.3, 95% CI: 1.07-4.78) and hospitalization (HR 1.7; 95% CI: 1.13-2.59) in those with high anticholinergic exposure. The longitudinal study among Belgian community-dwelling oldest old demonstrated great anticholinergic exposure, which was associated with increased risk of mortality and hospitalization after 18 months.