The effect of the anticholinergic burden on duration and severity of delirium in older hip-surgery patients with and without haloperidol prophylaxis: A post hoc analysis

BACKGROUND

Anticholinergic acting drugs have been associated with delirium in older patients.

OBJECTIVE

To examine the association between the anticholinergic burden (ACB) and the duration and severity of delirium in older hip-surgery patients with or without haloperidol prophylaxis.

METHODS

Older patients with a postoperative delirium following hip surgery from a randomized controlled trial investigating the effects of haloperidol prophylaxis on delirium incidence were included in this study. The ACB was quantified using two different tools, the Anticholinergic Drug Scale and an Expert Panel. Using linear regression, the association between the ACB and delirium was analyzed.

RESULTS

Overall delirium duration and severity were not significantly associated with the ACB. Also, no statistically significant differences were found in delirium duration or severity between the placebo and haloperidol treatment groups for the ACB groups. The protective effect of haloperidol on delirium duration and severity however tended to be present in patients with no or a low ACB but not or to a lesser extent in patients with an intermediate to high ACB.

CONCLUSIONS

The ACB was not significantly associated with delirium duration or severity. Haloperidol prophylaxis tended to shorten delirium duration and decrease delirium severity in patients with no or a low ACB. To further explore the influence of anticholinergic acting drugs on delirium duration and severity and the effect of concomitant haloperidol use, additional research with a higher haloperidol dose, a larger study population, and ACB quantification taking drug exposure into account is warranted.

High anticholinergic burden at admission associated with in-hospital mortality in older patients: A comparison of 19 different anticholinergic burden scales

Although no gold standard exists to assess a patient's anticholinergic burden, a review identified 19 anticholinergic burden scales (ABSs). No study has yet evaluated whether a high anticholinergic burden measured with all 19 ABSs is associated with in‐hospital mortality and length of stay (LOS). We conducted a cohort study at a Swiss tertiary teaching hospital using patients' electronic health record data from 2015–2018. Included were patients aged ≥65 years, hospitalised ≥48 h without stays and >24 h in intensive care. Patients' cumulative anticholinergic burden score was classified using a binary (<3: low, ≥3: high) and categorical approach (0: no, 0.5–3: low, ≥3: high). In‐hospital mortality and LOS were analysed using multivariable logistic and linear regression, respectively. We included 27,092 patients (mean age 78.0 ± 7.5 years, median LOS 6 days). Of them, 913 died. Depending on the evaluated ABS, 1370 to 17,035 patients were exposed to anticholinergics. Patients with a high burden measured by all 19 ABSs were associated with a 1.32‐ to 3.03‐fold increase in in‐hospital mortality compared with those with no/low burden. We obtained similar results for LOS. To conclude, discontinuing drugs with anticholinergic properties (score ≥3) at admission might be a targeted intervention to decrease in‐hospital mortality and LOS.

A comparison of anticholinergic burden in older patients with and without cancer

Aim: To compare anticholinergic burden (ACB) in older patients with and without cancer and evaluate the effects of ACB on geriatric syndromes. Methods: A total of 291 patients from the geriatric clinic and 301 patients from the oncology clinic were evaluated. ACB <2 was categorized as low ACB and ACB ≥2 was categorized as high ACB. A comprehensive geriatric assessment was performed on patients from the geriatric clinic. Results: ACB scores were significantly higher in patients without cancer compared with those with cancer (p < 0.005). Number of falls and Geriatric Depression Scale 15 scores were higher and Mini-Nutritional Assessment and Barthel/Lawton activities of daily living scores were lower in geriatric patients with high ACB scores compared with those with low ACB scores (p < 0.005). Conclusion: It is crucial to understand the potential effects of ACB for rational drug use and optimum cancer management in older patients with cancer.

The Interplay between Anticholinergic Burden and Anemia in Relation to 1-Year Mortality among Older Patients Discharged from Acute Care Hospitals

Anticholinergic burden (ACB) and anemia were found associated with an increased risk of death among older patients. Additionally, anticholinergic medications may contribute to the development of anemia. Therefore, we aimed at investigating the prognostic interplay of ACB and anemia among older patients discharged from hospital. Our series consisted of 783 patients enrolled in a multicenter observational study. The outcome of the study was 1 year mortality. ACB was assessed by an Anticholinergic Cognitive Burden score. Anemia was defined as hemoglobin < 13 g/dL in men and <12 g/dL in women. The association between study variables and mortality was investigated by Cox regression analysis. After adjusting for several potential confounders, ACB score = 2 or more was significantly associated with the outcome in anemic patients (HR = 1.93, 95%CI = 1.13–3.40), but not non anemic patients (HR = 1.51, 95%CI = 0.65–3.48). An additive prognostic interaction between ACB and anemia was observed (p = 0.02). Anemia may represent a relevant effect modifier in the association between ACB and mortality.

Effects of Clozapine on Neurocognitive Functions in Schizophrenia: A Naturalistic Comparison to Non-clozapine Antipsychotics

OBJECTIVE

While clozapine is recognized as the most effective antipsychotic for individuals with treatment-resistant schizophrenia, its effects on neurocognition remain unclear. This study aimed to compare the neurocognitive effects of clozapine treatment to those of non-clozapine antipsychotics in patients with schizophrenia and to examine the role of anticholinergic burden on cognitive impairments.

DESIGN

This was a naturalistic study. Cross-sectional data were drawn from participants with chronic schizophrenia in two clinical trials assessing cognition. Cognition was evaluated using the Measurement and Treatment Research to Improve Cognition in Schizophrenia (MATRICS) Consensus Cognitive Battery (MCCB). Anticholinergic burden was calculated for each medication using the Anticholinergic Cognitive Burden (ACB) scoring system. We stratified the participants treated with non-clozapine antipsychotics into high ACB score versus low ACB score groups.

RESULTS

One hundred and seventy participants were enrolled and treated with clozapine (n=58) or non-clozapine antipsychotics (n=112). We observed no significant differences in the MCCB T-scores between the clozapine and the total non-clozapine groups for the cognitive composite score and the seven domain scores. However, the non-clozapine high ACB group showed significant impairments in processing speed and attention/vigilance, in contrast to the non-clozapine low ACB group (p<0.05).

CONCLUSION

Our results show that cognitive effects of clozapine might be no different from other antipsychotics. Negative effects on neurocognition in participants treated with antipsychotics with a high ACB score were related to their total ACB score.

Anticholinergic Exposure in Elderly Complex Chronic Patients: A Cross-Sectional Study

BACKGROUND

Elderly patients with multiple chronic conditions are closely linked to polymedication, a condition that is also highly associated with the presence of adverse effects, such as those observed by anticholinergic activity. Anticholinergic burden is defined in a very variable way and is described inconsistently using different scores and providing different interpretations of the risk of suffering from anticholinergic adverse effects.

OBJECTIVE

The objective is to analyse the anticholinergic risk exposure in elderly complex chronic patients.

METHODS

A observational multicentre study was performed for a cohort of complex chronic patients over 65 years who received treatment with at least one drug with anticholinergic activity. Anticholinergic exposure was assessed using ten scales included in the Anticholinergic Burden Calculator.

RESULTS

473 patients were recruited, being 67.7% with excessive polypharmacy. 80 was the total number of anticholinergic drugs with any scale, with a median of 2 drugs with anticholinergic activity per patient (IQR=2). Three scales evaluated more than 70% of the patients (Chew: 79.1%; Drug Burden Index (DBI): 77.8%; Anticholinergic Cognitive Burden (ACB): 75.9%). The percentage of different drugs with anticholinergic properties evaluated ranged from 13.8% (Anticholinergic Burden Classification (ABC)) to 57.5% (DBI) and anticholinergic drugs prescriptions oscillated from 14% (Anticholinergic Risk Scale (ARS)) to 53.3% (DBI). 71.1% of patients were at risk (moderate and high risk) according to DBI vs. 9.7% by ARS at the opposite side. Important differences of anticholinergic risk in patients with excessive polypharmacy were in ACB, ABC and DBI scales.

CONCLUSION

This study has highlighted clear differences between the scales used. DBI seems to be the scale that identifies a higher number of elderly chronic complex patients at risk of developing anticholinergic adverse effects.

Risk of anticholinergic burden in adults with intellectual disabilities: a Scottish retrospective cohort study of n = 17 220

BACKGROUND

Several drugs have anticholinergic side effects that are associated with adverse health outcomes. Anticholinergic burden studies in adults with intellectual disabilities (ID) have focused exclusively on older adults. This study investigates anticholinergic burden and its associations in adults with ID of all ages (17-94 years).

METHODS

Adults with ID (n = 4 305), each with three general population age-sex-neighbourhood-matched controls (n = 12 915), were linked to their prescribed medications with anticholinergic effects between 2009 and 2017. Analyses were undertaken using logistic regression models.

RESULTS

Adults with ID were more likely to be prescribed any anticholinergic medicines, odds ratio (OR) = 1.49 (1.38-1.59), especially 'very strong' risk medicines, OR = 2.59 (2.39-2.81); 48.5% had very high total anticholinergic burden (3+) compared with 35.4% of the general population, OR = 1.77 (1.64-1.90). This group difference was greater for males, OR = 2.02 (1.84-2.22), than females, OR = 1.48 (1.33-1.65). Adults with ID had significantly higher odds of having very high total anticholinergic burden up to 75 years old, with the greatest group effect occurring in younger ages, 17-24-year-olds, OR = 3.05 (2.39-3.89), and the extent of the difference decreased as age increased. The main effect of neighbourhood deprivation showed greater group differences with increasing affluence of neighbourhood. Results examining only the ID group showed that very high total anticholinergic burden was greatest for females, OR = 1.21 (1.07-1.37), and those over age 55, and extent of neighbourhood deprivation was not significant.

CONCLUSIONS

Adults with ID are at higher risk of anticholinergic burden than the general population, especially young adults. Overall anticholinergic burden increased with age, but burden was high across all ages in the ID group. Very high total anticholinergic burden is prevalent across all types of neighbourhoods for the adults with ID, in contrast to the steeper gradient seen in the general population. Adults with ID have increased likelihood of unintended adverse effects, regardless of potential confounds, so clinicians undertaking medication reviews need to consider anticholinergic side effects and cumulative burden across concomitant medications, including in young adults with ID, not just older adults, and particularly women.

A Cohort Study of Anticholinergic Medication Burden and Incident Dementia and Stroke in Older Adults

BACKGROUND

Anticholinergic medications may increase risk of dementia and stroke, but prospective studies in healthy older people are lacking.

OBJECTIVE

Compare risk of incident dementia and stroke by anticholinergic burden among initially healthy older people.

DESIGN

Prospective cohort study.

SETTING

Primary care (Australia and USA).

PARTICIPANTS

19,114 community-dwelling participants recruited for the ASPREE trial, aged 70+ years (65+ if US minorities) without major cardiovascular disease, dementia diagnosis, or Modified Mini-Mental State Examination score below 78/100.

MEASUREMENTS

Baseline anticholinergic exposure was calculated using the Anticholinergic Cognitive Burden (ACB) score. Dementia was adjudicated using Diagnostic and Statistical Manual of Mental Disorders volume IV criteria, and stroke using the World Health Organization definition.

RESULTS

At baseline, 15,000 participants (79%) had an ACB score of zero, 2930 (15%) a score of 1-2, and 1184 (6%) a score of ≥ 3 (indicating higher burden). After a median follow-up of 4.7 years and adjusting for baseline covariates, a baseline ACB score of ≥ 3 was associated with increased risk of ischemic stroke (adjusted HR 1.58, 95% CI 1.06, 2.35), or dementia (adjusted HR 1.36, 95% CI 1.01, 1.82), especially of mixed etiology (adjusted HR 1.53, 95% CI 1.06, 2.21). Results were similar for those exposed to moderate/highly anticholinergic medications.

LIMITATIONS

Residual confounding and reverse causality are possible. Assessment of dose or duration was not possible.

CONCLUSIONS

High anticholinergic burden in initially healthy older people was associated with increased risk of incident dementia and ischemic stroke. A vascular effect may underlie this association. These findings highlight the importance of minimizing anticholinergic exposure in healthy older people.

Association between Anticholinergic Burden and Constipation: A Systematic Review

The association between anticholinergic burden and constipation is not well defined and documented; for this reason, a systematic review was carried out in five databases (Medline, Embase, Cochrane Central Register of Controlled Trials, CINAHL, and Scopus), including studies assessing the correlation between anticholinergic burden, and constipation between January 2006 and December 2020. Data extraction was conducted independently by two researchers. Abstracts and titles were reviewed to determine eligibility for review with eligible articles read in full. From 2507 identified articles, 11 were selected for this review: six cross-sectional studies, four retrospective cohort studies, and a post hoc analysis of a randomized clinical trial. Overall, nine studies reported at least one statistical association between anticholinergic burden and constipation, finding 13 positive results out of 24 association measurements. A total of 211,921 patients were studied. The association between constipation and anticholinergic burden could be demonstrated in studies including 207,795 patients. Most studies were not designed to find differences in constipation prevalence and did not adjust the results by confounding factors. Our findings suggest that a correlation between anticholinergic burden and constipation exists. Higher quality-evidence studies are needed, including analysis that considers confounding factors, such as other non-pharmacological causes of constipation.

Are Anticholinergic Symptoms a Risk Factor for Falls in Older General Practice Patients With Polypharmacy? Study Protocol for the Development and Validation of a Prognostic Model

Background: Cumulative anticholinergic exposure, also known as anticholinergic burden, is associated with a variety of adverse outcomes. However, studies show that anticholinergic effects tend to be underestimated by prescribers, and anticholinergics are the most frequently prescribed potentially inappropriate medication in older patients. The grading systems and drugs included in existing scales to quantify anticholinergic burden differ considerably and do not adequately account for patients’ susceptibility to medications. Furthermore, their ability to link anticholinergic burden with adverse outcomes such as falls is unclear. This study aims to develop a prognostic model that predicts falls in older general practice patients, to assess the performance of several anticholinergic burden scales, and to quantify the added predictive value of anticholinergic symptoms in this context.

Methods: Data from two cluster-randomized controlled trials investigating medication optimization in older general practice patients in Germany will be used. One trial (RIME, n = 1,197) will be used for the model development and the other trial (PRIMUM, n = 502) will be used to externally validate the model. A priori, candidate predictors will be selected based on a literature search, predictor availability, and clinical reasoning. Candidate predictors will include socio-demographics (e.g. age, sex), morbidity (e.g. single conditions), medication (e.g. polypharmacy, anticholinergic burden as defined by scales), and well-being (e.g. quality of life, physical function). A prognostic model including sociodemographic and lifestyle-related factors, as well as variables on morbidity, medication, health status, and well-being, will be developed, whereby the prognostic value of extending the model to include additional patient-reported symptoms will be also assessed. Logistic regression will be used for the binary outcome, which will be defined as “no falls” vs. “≥1 fall” within six months of baseline, as reported in patient interviews.

Discussion: As the ability of different anticholinergic burden scales to predict falls in older patients is unclear, this study may provide insights into their relative importance as well as into the overall contribution of anticholinergic symptoms and other patient characteristics. The results may support general practitioners in their clinical decision-making and in prescribing fewer medications with anticholinergic properties.

Anticholinergic Burden and Cognitive Performance in Patients With Schizophrenia: A Systematic Literature Review

Objective: Cognitive impairment in schizophrenia forms the key cause of the disease's disability, leading to serious functional, and socioeconomic implications. Dopaminergic-cholinergic balance is considered essential to cognitive performance in schizophrenia and patients are often treated with many drugs with anticholinergic properties. This study aims to examine the cognitive impact of anticholinergic burden in patients with schizophrenia. Methods: A systematic literature review was performed on English-language studies published on PubMed, Embase, and Web of Science, from inception to June 2021, to identify research studies that examined the effect of anticholinergic load on cognition in clinically stable patients with schizophrenia. No restrictions on study design, age of participants, or geographical distribution were applied. Two researchers performed independently the screening and shortlisting of the eligible articles. A narrative synthesis of the main characteristics and findings of studies included was reported. Results: In total, 17 articles of varying methodological design met the inclusion criteria. Three of them found statistically significant improvement in cognition after anticholinergic tapering without adverse effects. Thirteen studies found a statistically significant association between high anticholinergic burden and cognitive impairment (neurocognitive composite scores and individual cognitive domains such as learning and memory, executive function, processing speed), apart from a study, related to the specific characteristics of clozapine. Conclusions: Medication with increased anticholinergic load has been found in most of the studies to negatively affect neurocognitive performance of patients with schizophrenia. However, the clinical and methodological heterogeneity of studies included limit our interpretation and conclusions.

Relation between anticholinergic burden and cognitive impairment: Results from the Monzino 80-plus population-based study

PURPOSE

We examined data collected in the Monzino 80-plus study to assess the relations between cognitive performance and ACB scores according to the hypothesis that a higher anticholinergic burden is associated with reduced cognitive performance.

METHODS

The Monzino 80-plus is an ongoing, prospective, door-to-door population-based study started in 2002 among all residents 80 years or older in eight municipalities of Varese province, Italy. To establish the relation between cognitive impairment and the anticholinergic drug burden we recorded the ACB score for each patient at baseline. The relations between ACB score and dementia or MMSE scores were also examined after exclusion of patients taking any antipsychotic.

RESULTS

A sample of 2140 elderly people was eligible for analysis. A significant dose-effect relationship was observed between total ACB score and diagnosis of dementia in univariate and multivariate models. Patients in ACB class ≥4 had about 4.5 times the risk of diagnosis of dementia. A relation was also found between higher ACB scores and lower MMSE scores; patients who scored 4 or more had a mean of 6.4 points lower than those not taking anticholinergic drugs. The dose-effect relationship between ACB score and diagnosis of dementia was not maintained after exclusion of patients using antipsychotics, while the association between higher ACB scores and lower MMSE scores was still present, with patients in ACB class ≥4 having a mean score about 4.4 lower.

CONCLUSIONS

There are clear relations between anticholinergic load and reduced cognitive performance, while the association with dementia remains uncertain. For primary care and geriatric clinicians, an ACB score ≥ 4 can be considered the cut-off to identify high-risk populations who may benefit from the evaluation of anticholinergic burden with the ACB scale.

Association between anticholinergic burden and hospital readmission in older patients: a prospective analysis

OBJECTIVE

Despite known adverse effects of anticholinergic (AC) medication, little work has been devoted to the impact of high anticholinergic burden on the rate of hospital readmission. The purpose of this study was to analyze prospectively the link between high AC burden and the rate of all-cause thirty-day hospital readmission in older people.

STUDY DESIGN

This was a prospective non-interventional study conducted from January to August 2019 in one acute-care geriatric ward. All hospital stays of patients aged at least 75 years who were discharged to their home were included in the analysis. AC burden was determined from discharge prescriptions using the Anticholinergic Drug Scale (ADS) and the Anticholinergic Risk Scale (ARS), and defined as high if ≥3.

RESULTS

The analysis concerned 350 hospital stays. Median patient age was 88 years (interquartile interval 84-91). In a multivariate analysis, the risk of hospital readmission within 30 days was not increased for patients with high AC burden (ADS≥3): odds ratio 1.16 [95% confidence interval 0.56-2.37], compared to a patient whose anticholinergic burden was not high.

CONCLUSION

Unlike retrospective studies on this issue, the findings of our prospective analysis do not support a higher risk of hospital admission within 30 days for older people with high AC burden as assessed from their discharge prescriptions.

Impact of Anticholinergic Medication Burden on Mobility and Falls in the Lifestyle Interventions for Elders (LIFE) Study

Anticholinergic cognitive burden (ACB) may be associated with detrimental effects on mobility and physical independence in older adults. We evaluated the incidence of major mobility disability (MMD), persistent major mobility disability (PMMD), and injurious falls among participants within the Lifestyle Interventions for Elders (LIFE) trial according to varied anticholinergic burden levels. Participants aged 70-89 years were randomized to a physical activity (PA) or successful aging (SA) intervention and evaluated by ACB medication use as a summed score of a previously developed ACB scale. Confounders included demographic characteristics, physical function, cognitive function, and fall history. Average participant follow-up was 2.6 years and included outcome assessment for MMD, PMMD, and injurious falls every six months. Adjusted proportional hazards models evaluated the independent effects of ACB scores as well as interaction effects with the intervention. Of the 1635 participants, 986 (60%) used ≥1 anticholinergic medication. Compared to those with no burden, participants with an ACB score of 1 demonstrated increased MMD (HR = 1.42 [1.13-1.78]), PMMD (HR = 1.53 [1.12-2.09]), and injurious falls (HR = 1.60 [1.10-2.32]). Results similar in magnitude were observed for all other ACB levels versus the no burden group. Stepwise dose-response comparisons between ACB groupings did not demonstrate significant differences in outcomes. Stratification by PA or SA interventions demonstrated few differences from the combined overall trial results. Compared to those not taking anticholinergic medications, participants taking anticholinergic medications generally demonstrated increased risk of MMD, PMMD, and injurious falls. Total anticholinergic burden was not associated with a stepwise dose-response relationship in mobility disability and may lack sensitivity to capture varied responses.

Cognitive Effects of Anticholinergic Load in Women with Overactive Bladder

Overactive bladder syndrome (OAB) is defined as urinary urgency, usually accompanied by frequency and nocturia, with or without urgency incontinence, in the absence of urinary tract infection or other obvious pathology. The mainstay of treatment of OAB is anticholinergic/antimuscarinic medication. These drugs block muscarinic receptors throughout the body, not only the bladder, including in the brain, which may lead to cognitive side effects. Anticholinergic load or burden is the cumulative effect of taking drugs that are capable of producing anticholinergic adverse effects. The elderly are more susceptible to these effects, especially as there is increased permeability of the blood brain barrier. The anticholinergic drugs for OAB are able to enter the central nervous system and lead to central side effects. There is increasing evidence that a high anticholinergic load is linked to the development of cognitive impairment and even dementia. Some studies have found an increased risk of mortality. In view of this, care is needed when treating OAB in the elderly. Trospium chloride is a quaternary amine anticholinergic, which has a molecular structure, which theoretically means it is less likely to cross the blood brain barrier and exert central side effects. Alternatively, mirabegron can be used, which is a beta-3 adrenoceptor agonist, which does not add to the anticholinergic load or exert central nervous system side effects. Conservative therapy can be used as an alternative to pharmacological treatment in the form of behavioral modification, fluid management and bladder retraining. Neuromodulation or the use of botox can also be alternatives, but success may be less in the older adult and will require increased hospital attendances.

Baseline anticholinergic burden from medications predicts poorer baseline and long-term health-related quality of life in 16 675 men and women of EPIC-Norfolk prospective population-based cohort study

PURPOSE

Previous studies investigating the association between anticholinergic burden (ACB) and health-related quality of life (HRQoL) showed conflicting results and focused on older adults or specific patient groups only.

METHODS

Participants from the European Prospective Investigation of Cancer-Norfolk study were divided into three groups according to their ACB from medications at baseline, representing ACB scores of 0, 1 and ≥2. Outcomes of interest were the physical and mental component summary scores (PCS and MCS) of the Short Form-36, collected at 18 months from the baseline and again after a mean 13 years of follow-up. Linear regression and logistic regression for cross-sectional and longitudinal associations between ACB and HRQoL were constructed adjusting for potential confounders.

RESULTS

A total of 16 675 participants, mean age 58.9 ± 9.1 years (55.6% female) and 7133 participants, mean age at follow-up 69.1 ± 8.7 years (56.8% female), were included in the cross-sectional and longitudinal analyses, respectively. In cross-sectional analysis, higher anticholinergic burden was associated with higher odds of being in the lowest quartile of PCS (ACB = 1; OR, 1.85[1.64, 2.09] and ACB ≥ 2:2.19[1.85, 2.58] and MCS (ACB = 1:1.47[1.30, 1.66] and ACB ≥ 2:1.68[1.42, 1.98]). In longitudinal analysis, higher anticholinergic burden was similarly associated with higher odds of being in the lowest quartile of PCS (ACB = 1:1.56[1.24, 1.95] and ACB ≥ 2:1.48[1.07, 2.03]) compared with ACB 0 group. The association with MCS scores did not reach statistical significance.

CONCLUSION

The use of anticholinergic medications is associated with both short and long-term poorer physical functions but association with mental functioning appears more short-term.

Assessing Risks of Polypharmacy Involving Medications With Anticholinergic Properties

PURPOSE

Anticholinergic burden (ACB), the cumulative effect of anticholinergic medications, is associated with adverse outcomes in older people but is less studied in middle-aged populations. Numerous scales exist to quantify ACB. The aims of this study were to quantify ACB in a large cohort using the 10 most common anticholinergic scales, to assess the association of each scale with adverse outcomes, and to assess overlap in populations identified by each scale.

METHODS

We performed a longitudinal analysis of the UK Biobank community cohort (502,538 participants, baseline age: 37-73 years, median years of follow-up: 6.2). The ACB was calculated at baseline using 10 scales. Baseline data were linked to national mortality register records and hospital episode statistics. The primary outcome was a composite of all-cause mortality and major adverse cardiovascular event (MACE). Secondary outcomes were all-cause mortality, MACE, hospital admission for fall/fracture, and hospital admission with dementia/delirium. Cox proportional hazards models (hazard ratio [HR], 95% CI) quantified associations between ACB scales and outcomes adjusted for age, sex, socioeconomic status, body mass index, smoking status, alcohol use, physical activity, and morbidity count.

RESULTS

Anticholinergic medication use varied from 8% to 17.6% depending on the scale used. For the primary outcome, ACB was significantly associated with all-cause mortality/MACE for each scale. The Anticholinergic Drug Scale was most strongly associated with mortality/MACE (HR = 1.12; 95% CI, 1.11-1.14 per 1-point increase in score). The ACB was significantly associated with all secondary outcomes. The Anticholinergic Effect on Cognition scale was most strongly associated with dementia/delirium (HR = 1.45; 95% CI, 1.3-1.61 per 1-point increase).

CONCLUSIONS

The ACB was associated with adverse outcomes in a middle- to older-aged population. Populations identified and effect size differed between scales. Scale choice influenced the population identified as potentially requiring reduction in ACB in clinical practice or intervention trials.

Anticholinergic burden and fractures: a protocol for a methodological systematic review and meta-analysis

INTRODUCTION

Medications with anticholinergic activity are used in the treatment of many diseases common in old age, including depression, psychosis, Parkinson's disease, allergies, pain and urinary incontinence. A high anticholinergic burden (ACB) is considered a major risk factor for fractures in older adults but recent studies reported inconsistent results. These inconsistencies may partly be due to differences in methodological aspects. However, no systematic review so far has addressed this association and considered study methods. Thus, we aim to conduct a systematic review and meta-analysis of observational studies addressing the association of ACB with fractures and to provide a methodological appraisal of the included studies.

METHODS AND ANALYSIS

We will search MEDLINE, EMBASE, the Science Citation Index, CENTRAL and grey literature using a strategy that combines the terms anticholinergic and fractures. We will hand search reference lists of articles. Two reviewers will independently screen all identified abstracts for eligibility and evaluate the risk of bias of the included studies using the Newcastle-Ottawa Quality Assessment Scale and RTI item bank. Discrepancies will be resolved by consensus or consultation with a third researcher. We will conduct a meta-analysis, either for the overall population or for specific and more homogeneous subgroups, if the number of studies retrieved and their heterogeneity allows it.

ETHICS AND DISSEMINATION

No ethics approval will be sought, as no original data will be collected for this review. Findings will be disseminated through peer-reviewed publication and conference presentations.

PROSPERO REGISTRATION NUMBER

CRD42018116737.

Interventions to Reduce Anticholinergic Burden in Adults Aged 65 and Older: A Systematic Review

INTRODUCTION

Older age is associated with multimorbidity and polypharmacy with high anticholinergic burden (ACB). High ACB is linked to adverse events such as poor physical functioning, dementia, cardiovascular disease, and falls. Interventions are needed to reduce this burden.

AIMS/OBJECTIVES

The aim was to systematically review the literature to identify and describe studies of clinical and cost-effectiveness of interventions designed to reduce ACB in adults (≥65 years) on polypharmacy regimes, compared with usual care. The objective was to answer the following questions: What are the contents of the interventions? Were these interventions clinically effective? Were these interventions cost effective?.

DESIGN, SETTING, AND PARTICIPANTS

Systematic review of interventions to reduce anticholinergic burden in adults aged 65 and older in any clinical setting.

METHODS

Eligible papers reported primary or secondary research describing any type of intervention including systematic reviews, randomized controlled trials (RCTs), controlled clinical trials, or nonrandomized pre-post intervention studies (PPIs) published in English from January 2010 to February 2019. Databases searched included CINAHL, Ovid MEDLINE, EMBASE, and The Cochrane Central Register of Controlled Trials (CENTRAL).

RESULTS

The search yielded 5862 records. Eight studies (4 RCTs, 4 PPIs) conducted in hospital (4), community (2), nursing homes (1), and retirement villages (1) met the inclusion criteria. Pharmacists, either individually or as part of a team, provided the intervention in the majority of studies (6/8). Most (7/8) involved individual patient medication review followed by feedback to the prescriber. Two of the 4 RCTs and all non-RCTs reported a decrease in ACB following the intervention. No study reported cost outcome.

CONCLUSIONS/IMPLICATIONS

Pharmacists may be well placed to implement an ACB reduction intervention. This is the first systematic review of interventions to reduce ACB in older adults, and it highlights the need for development and testing of high-quality pragmatic clinical and cost-effectiveness trials in community and specific patient populations at high risk of harm from ACB. [PROSPERO registration: CRD42018089764].

Safe prescribing in cognitively vulnerable patients: the use of the anticholinergic effect on cognition (AEC) tool in older adult mental health services

Aims and methodMedication with anticholinergic action is associated with potentially serious adverse effects in older people. We present an evaluation of a novel anticholinergic burden scale introduced into routine practice in older adult services in the South London and Maudsley (SLaM) NHS Foundation Trust. Our aim was to assess whether this tool improved the accurate identification of anticholinergic medication and guided safer prescribing in cognitively vulnerable older people. RESULTS: The introduction of the anticholinergic effect on cognition (AEC) tool into clinical practice led to an increase in the identification and reporting to general practitioners of anticholinergic medication from 11 to 85% of cases (P = 0.0015).Clinical implicationsApplication of the AEC tool led to improved detection of anticholinergic medication and advice to primary care on when a medication review is necessary. This is an important step towards improving the safety of prescribing in this patient group.Declaration of interestSLaM NHS Foundation Trust owns both the app and IP for Medichec.

Association between cumulative anticholinergic burden and falls and fractures in patients with overactive bladder: US-based retrospective cohort study

OBJECTIVE

To estimate the association between cumulative anticholinergic burden and falls and fractures in patients with overactive bladder (OAB).

DESIGN

A retrospective claims-based study (2007-2015) of patients with OAB; outcomes from a subset were contrasted to a non-OAB comparison.

SETTING

United States, commercially and Medicare-insured population.

PARTICIPANTS

154 432 adults with OAB and 86 966 adults without OAB, mean age of 56 years, and 67.9% women.

MAIN OUTCOME MEASURES

Cumulative anticholinergic burden, a unitless value representing exposure over time, was estimated over the 12 months pre-index ('at baseline') and every 6 months post index. Burden was categorised as no burden (0), low burden (1-89), medium burden (90-499) or high burden (500+). Unadjusted rates of falls or fractures were estimated, and the increased risk associated with anticholinergic burden (measured at the closest 6-month interval prior to a fall or fracture) was assessed using a Cox proportional hazards model and a marginal structural model.

RESULTS

Median (IQR) baseline anticholinergic burden was 30 (0.0-314.0) and higher among older (≥65 years, 183 [3.0-713.0]) versus younger (<65 years, 13 [0.0-200.0]) adults. The unadjusted rate of falls or fractures over the period was 5.0 per 100 patient-years, ranging from 3.1 (95% CI 3.0-3.2) for those with no burden, to 7.4 (95% CI 7.1-7.6) for those with high burden at baseline. The adjusted risk of falls and fractures was greater with higher anticholinergic burden in the previous 6 months, with an HR of 1.2 (95% CI 1.2 to 1.3) for low burden versus no burden, to 1.4 (95% CI 1.3 to 1.4) for high versus no burden. Estimates from marginal structural models adjusting for time-varying covariates were lower but remained significantly higher with a higher anticholinergic burden. Rates of falls and fractures were approximately 40% higher among those with OAB (vs those without).

CONCLUSION

Higher levels of anticholinergic burden are associated with higher rates of falls and fractures, highlighting the importance of considering anticholinergic burden when treating patients with OAB.

Use of Anticholinergic Drugs According to Various Criteria and Their Association With Psychological Well-Being and Mortality in Long-Term Care Facilities

OBJECTIVES

To compare 3 internationally established criteria for drugs with anticholinergic properties (DAPs) and their associated factors in long-term care facilities, and to investigate the association between use of DAPs and psychological well-being (PWB) or mortality.

DESIGN

Cross-sectional study and 1-year follow-up of all-cause mortality.

SETTING AND PARTICIPANTS

Of all 4449 residents living in long-term care facilities in Helsinki in 2011, 2432 (≥65 years of age) participated after exclusion of residents with severe dementia.

MEASUREMENTS

Data on demographics, medication use, and active diagnoses were collected by trained staff using structured questionnaires. DAP use was defined by the following 3 international criteria: Chew's list, the Anticholinergic Risk Scale, and the Anticholinergic Drug Scale. The total number of DAPs was counted and referred to as anticholinergic burden. PWB was assessed by a questionnaire and yielded a score ranging from 0 to 1. Mortality data was retrieved from central registers.

RESULTS

Of all participants, 85% were DAP users according to at least 1 of the 3 criteria used. Overlap between the 3 criteria was only moderate. DAP users were younger and a larger proportion of them had better cognition. However, they suffered more often from depression and other psychiatric diagnoses than nonusers. DAP users had lower PWB scores than those not using DAPs, and PWB decreased linearly in the overlapping groups from nonusers to those using DAPs according to all 3 criteria. The total number of DAPs used predicted mortality.

CONCLUSIONS AND IMPLICATIONS

DAP use and PWB appear to be negatively associated. When combining several criteria of DAPs, their burden predicted mortality. Clinicians should carefully consider the potential benefits and harms when prescribing DAPs to older persons.

Comparison of Potentially Inappropriate Medications for People with Dementia at Admission and Discharge during An Unplanned Admission to Hospital: Results from the SMS Dementia Study

People with dementia (PWD) and cognitive impairment are particularly vulnerable to medication problems, and unplanned admission to hospital presents an opportunity to address polypharmacy, potentially inappropriate medications (PIMs) and anticholinergic burden. This study aimed to compare PIMS and other medication data for PWD to determine whether these changed during hospitalization. Medications documented in patient’s records at admission and discharge were evaluated for PWD recruited to phase one of a prospective quasi-experimental pre/post-controlled trial that was conducted at two regional hospitals in NSW, Australia. The study sample included PWD or cognitive impairment having an unplanned admission to hospital. Data were collected using a purpose developed audit tool for medications and PIMs, and a Modified Anticholinergic Burden Scale. Total participants were 277, and results determined that the cognitive status of PWD is not always detected during an unplanned admission. This may make them more vulnerable to medication problems and poor outcomes. Polypharmacy and PIMS for PWD were high at admission and significantly reduced at discharge. However, PWD should be routinely identified as high risk at admission; and there is potential to further reduce polypharmacy and PIMs during admission to hospital, particularly psychotropic medications at discharge. Future studies should focus on evaluating targeted interventions designed to increase medication safety for PWD.

Anticholinergic Burden in Hospice Patients With Dementia

BACKGROUND

End-of-life (EOL) patients with dementia have an increased risk for anticholinergic toxicities due to age-related pharmacokinetic and physiologic changes in conjunction with an increased susceptibility to drug-induced cognitive impairments. Despite this well-documented risk, the use of drugs with anticholinergic properties (DAPs) remains prevalent in EOL patients with dementia.

OBJECTIVE

The aims of this study were to describe prescribing patterns and characterize anticholinergic burden among hospice patients with dementia, as measured by the Anticholinergic Cognitive Burden (ACB) scale.

METHODS

This was a retrospective review of a national hospice patient information database. Patients included were admitted on January 1, 2016, discharged by death by December 31, 2016, and had a primary diagnosis of dementia. Patients' anticholinergic burden was calculated using ACB scores.

RESULTS

A total of 1283 patients met the inclusion criteria. Of those, 37.1% (n = 476) were prescribed at least 1 DAP. Specifically, 28.9% (n = 371) were prescribed 1 DAP, 6.6% (n = 84) were prescribed 2 DAPs, 1.6% (n = 20) were prescribed 3 DAPs, and 0.08% (n = 1) were prescribed 4 DAPs. The majority of patients prescribed a DAP had an ACB score of 3 (n = 359, 75.4%) and an average ACB score of 3.8. The most common DAPs prescribed in patients with an ACB score of 2 or higher were quetiapine (n = 202, 42.4%), atropine (n = 155, 32.6%), hyoscyamine (n = 61, 12.8%), olanzapine (n = 46, 9.6%), and scopolamine (n = 35, 7.4%).

CONCLUSION

Due to the limited benefit and increased harms with the use of DAPs, providers should aim to maximize nonpharmacologic options. By reducing the use of the top 5 DAPs identified in this study, the quality of life and care for EOL patients with dementia can potentially be improved.

Anticholinergic and sedative drug burden in community-dwelling older people: a national database study

OBJECTIVES

The Drug Burden Index (DBI) tool quantifies individual exposure to anticholinergic and sedative medications. The DBI has been internationally validated against adverse health outcomes in older people. DBI exposure has not been reported in the Irish older population. This study aimed to: (1) develop a list of drugs with clinically significant anticholinergic and/or sedative effects (DBI medications) relevant to Ireland; (2) examine, using the DBI formula, the prevalence of exposure to DBI medications in Irish older people and (3) explore patient factors associated DBI exposure.

DESIGN

A cross-sectional national pharmacy claims database study.

SETTING

Community setting using the General Medical Services (GMS) scheme pharmacy claims database maintained by the Health Service Executive Primary Care Reimbursement Services.

PARTICIPANTS

Irish older individuals (aged ≥65 years) enrolled in the GMS scheme and dispensed at least one prescription item in 2016 (n=428 516).

MAIN OUTCOME MEASURES

Prevalence of exposure to DBI medications and patient factors associated with DBI exposure.

RESULTS

282 874 (66%) of the GMS population aged ≥65 years were exposed to at least one DBI medication in 2016. Prevalence of exposure to DBI medications was significantly higher in females than males (females 71.6% vs males 58.7%, adjusted OR 1.65, 95% CI 1.63 to 1.68). Prevalence of DBI exposure increased progressively with the number of chronic drugs used, rising from 42.7% of those prescribed 0-4 chronic drugs to 95.4% of those on ≥12 chronic drugs (adjusted OR 27.8, 95% CI 26.7 to 29.0). The most frequently used DBI medications were codeine/paracetamol combination products (20.1% of patients), tramadol (11.5%), zopiclone (9.5%), zolpidem (8.5%), pregabalin (7.9%) and alprazolam (7.8%).

CONCLUSIONS

The majority of older people in Ireland are exposed to medications with anticholinergic and/or sedative effects, particularly females and those with multiple comorbidities. The high use of low-dose codeine/paracetamol combination products, Z-drugs and benzodiazepines, suggests there are opportunities for deprescribing.