Prevalence of Potentially Inappropriate Medication use in older drivers

Changes in the burden of medications that may impair driving among older adults before and after a motor vehicle crash

BACKGROUND

Medications are one of the most easily modifiable risk factors for motor vehicle crashes (MVCs) among older adults, yet limited information exists on how the use of potentially driver-impairing (PDI) medications changes following an MVC. Therefore, we examined the number and types of PDI medication classes dispensed before and after an MVC.

METHODS

This observational study included Medicare fee-for-service beneficiaries aged ≥67 years who were involved in a police-reported MVC in New Jersey as a driver between 2008 and 2017. Analyses were conducted at the "person-crash" level because participants could be involved in more than one MVC. We examined the use of 36 PDI medication classes in the 120 days before and 120 days after MVC. We described the number and prevalence of PDI medication classes in the pre-MVC and post-MVC periods as well as the most common PDI medication classes started and stopped following the MVC.

RESULTS

Among 124,954 person-crashes, the mean (SD) age was 76.0 (6.5) years, 51.3% were female, and 83.9% were non-Hispanic White. The median (Q1 , Q3 ) number of PDI medication classes was 2 (1, 4) in both the pre-MVC and post-MVC periods. Overall, 20.3% had a net increase, 15.9% had a net decrease, and 63.8% had no net change in the number of PDI medication classes after MVC. Opioids, antihistamines, and thiazide diuretics were the top PDI medication classes stopped following MVC, at incidences of 6.2%, 2.1%, and 1.7%, respectively. The top medication classes started were opioids (8.3%), skeletal muscle relaxants (2.2%), and benzodiazepines (2.1%).

CONCLUSIONS

A majority of crash-involved older adults were exposed to multiple PDI medications before and after MVC. A greater proportion of person-crashes were associated with an increased rather than decreased number of PDI medications. The reasons why clinicians refrain from stopping PDI medications following an MVC remain to be elucidated.

Geriatricians, general internists, and potentially inappropriate medications for a national sample of older adults

BACKGROUND

Older adults are often prescribed medications that are potentially dangerous and geriatricians have specialized training in treating polypharmacy that may benefit these patients. To examine this, we compared potentially inappropriate medication (PIM) prescribing rates between geriatricians and similar general internists in the United States.

METHODS

Using national cross-sectional data from 2013 to 2019, we compared annual PIM prescribing rates between 2815 outpatient geriatricians certified by the American Board of Internal Medicine in 1994-2018 and general internists matched 1:1 on IM certification exam score and year, residency exam pass rate, gender, and US birth and/or US medical school. PIM prescribing was based on the Healthcare Effectiveness Data and Information Set (HEDIS) PIM physician annual prescribing measures which consider medications flagged as potentially inappropriate in the American Geriatric Society Beers Criteria® guideline. We also examined prescribing of appropriate alternative medications. Prescribing rates were calculated as the percentage a physician's patients with Medicare fee-for-service part D enrollment seen in the outpatient setting in a given year (mean: 150 patients per physician) with a PIM prescription they prescribed.

RESULTS

Across 30,677 physician-year observations, geriatricians were 16.7% less likely (95% confidence interval (CI): -19.8 to -13.7, p < 0.001) to prescribe a PIM (7.2% versus 8.7% of patients respectively) and 2.7% more likely (95% CI: 0.8 to 4.5, p = 0.004) to prescribe an appropriate alternative medication (52.0% versus 50.7% of patients respectively). Lower PIM prescribing was observed for most medication sub-types including central nervous system, anticholinergic, pain, and endocrine medications. In sensitivity analyses, differences in prescribing were similar when comparing recently trained physicians with more experienced physicians.

CONCLUSION

Findings suggest geriatricians in the United States prescribe PIMs at lower rates than general internists. This highlights the value geriatricians provide as well as opportunities to embed key principles of geriatric care into internal medicine training and health care delivery systems.

Older Adults and Unintentional Injury

Clinicians play an important role in the prevention of unintentional injuries. Falls and motor vehicle crashes (MVC) have predictable and overlapping antecedents. Systematic screening for and management of vision impairment, frailty, cognitive impairment, polypharmacy, and inappropriate medications will reduce both falls and MVC risks. Fall-prevention measures, such as strength training, need to be more widely prescribed by physicians and implemented by older adults. Technologically tailored approaches are needed to leverage fall-reduction programs at home, as well as education of older adults regarding home hazards.

Motor Vehicle Crash Risk in Older Adult Drivers With Attention-Deficit/Hyperactivity Disorder

Importance

Symptoms of attention-deficit/hyperactivity disorder (ADHD), such as inattentiveness and impulsivity, could affect daily functioning and driving performance throughout the life span. Previous research on ADHD and driving safety is largely limited to adolescents and young adults.

Objective

To examine the prevalence of ADHD and the association between ADHD and crash risk among older adult drivers.

Design, Setting, and Participants

This prospective cohort study collected data from primary care clinics and residential communities in 5 US sites (Ann Arbor, Michigan; Baltimore, Maryland; Cooperstown, New York; Denver, Colorado; and San Diego, California) between July 6, 2015, and March 31, 2019. Participants were active drivers aged 65 to 79 years at baseline enrolled in the Longitudinal Research on Aging Drivers project who were studied for up to 44 months through in-vehicle data recording devices and annual assessments. The data analysis was performed between July 15, 2022, and August 14, 2023.

Exposure

Lifetime ADHD based on an affirmative response to the question of whether the participant had ever had ADHD or had ever been told by a physician or other health professional that he or she had ADHD.

Main Outcomes and Measures

The main outcomes were hard-braking events defined as maneuvers with deceleration rates of 0.4g or greater, self-reported traffic ticket events, and self-reported vehicular crashes. Multivariable negative binomial modeling was used to estimate adjusted incidence rate ratios (aIRRs) and 95% CIs of outcomes according to exposure status.

Results

Of the 2832 drivers studied, 1500 (53.0%) were women and 1332 (47.0%) were men with a mean (SD) age of 71 (4) years. The lifetime prevalence of ADHD in the study sample was 2.6%. Older adult drivers with ADHD had significantly higher incidence rates of hard-braking events per 1000 miles than those without ADHD (1.35 [95% CI, 1.30-1.41] vs 1.15 [95% CI, 1.14-1.16]), as well as self-reported traffic ticket events per 1 million miles (22.47 [95% CI, 16.06-31.45] vs 9.74 [95% CI, 8.99-10.55]) and self-reported vehicular crashes per 1 million miles (27.10 [95% CI, 19.95-36.80] vs 13.50 [95% CI, 12.61-14.46]). With adjustment for baseline characteristics, ADHD was associated with a significant 7% increased risk of hard-braking events (aIRR, 1.07; 95% CI, 1.02-1.12), a 102% increased risk of self-reported traffic ticket events (aIRR, 2.02; 95% CI, 1.42-2.88), and a 74% increased risk of self-reported vehicular crashes (aIRR, 1.74; 95% CI, 1.26-2.40).

Conclusions and Relevance

As observed in this prospective cohort study, older adult drivers with ADHD may be at a significantly elevated crash risk compared with their counterparts without ADHD. These findings suggest that effective interventions to improve the diagnosis and clinical management of ADHD among older adults are warranted to promote safe mobility and healthy aging.

Special Report from the CDC: Provider knowledge and practices around driving safety and fall prevention screening and recommendations for their older adult patients, DocStyles 2019

INTRODUCTION

Falls and motor-vehicle crashes (MVCs) are leading causes of unintentional injury deaths among older adults (65+) in the United States. Injury prevention resources exist to help healthcare providers reduce fall and MVC risk among older adult patients. However, awareness of these resources among healthcare providers is unclear.

METHODS

Questions were included in the 2019 DocStyles survey that assessed healthcare provider awareness of three injury prevention resources: (1) the American Geriatrics Society's (AGS's) Clinician's Guide to Assessing and Counseling Older Drivers, (2) the Clinical Assessment of Driving Related Skills (CADReS), and (3) the Centers for Disease Control and Prevention's (CDC) Stopping Elderly Accidents, Deaths, and Injuries (STEADI) initiative. We also explored the circumstances and current practices for counseling older adult patients on fall prevention and driving safety.

RESULTS

Only 20% of providers reported awareness of any of the injury prevention resources. Providers were more likely to report either screening for fall risk or unsafe driving when an older adult presented with a fall concern (74.5%) or driving concern or recent crash (85.1%), compared to annual screening for fall risk (67.7%) or driving safety (47.7%). More providers reported discussing the increased fall or MVC risk associated with patient medications, referring patient for driving fitness evaluations, or discussing alternative transportation options with the patient after adverse events or patient-initiated concerns compared to routine annual discussions.

CONCLUSION

Healthcare gaps persist in the screening and assessment of older adult risk factors for falls and unsafe driving. Limited provider awareness of clinical resources related to preventing older adult falls and unsafe driving may be contributing to these healthcare gaps.

PRACTICAL APPLICATIONS

Improving healthcare provider awareness of these resources could help them identify older adults at risk of a fall or MVC and promote injury prevention efforts in their clinical practices.

A probabilistic bias analysis on the magnitude of unmeasured confounding: The impact of driving mileage on road traffic crashes

INTRODUCTION

Unmeasured confounding can lead to biased interpretations of empirical findings. This paper aimed to assess the magnitude of suspected unmeasured confounding due to driving mileage and simulate the statistical power required to detect a discrepancy in the effect of polypharmacy on road traffic crashes (RTCs) among older adults.

METHODS

Based on Monte Carlo Simulation (MCS) approach, we estimated 1) the magnitude of confounding of driving mileage on the association of polypharmacy and RTCs and 2) the statistical power of to detect a discrepancy from no adjusted effect. A total of 1000 studies, each of 500000 observations, were simulated.

RESULTS

Under the assumption of a modest adjusted exposure-outcome odds ratio of 1.35, the magnitude of confounding bias by driving mileage was estimated to be 16% higher with a statistical power of 50%. Only an adjusted odds ratio of at least 1.60 would be associated with a statistical power of about 80% CONCLUSION: This applied probabilistic bias analysis showed that not adjusting for driving mileage as a confounder can lead to an overestimation of the effect of polypharmacy on RTCs in older adults. Even considering a large sample, small to moderate adjusted exposure effects were difficult to be detected.

Potentially inappropriate medication among older patients with diabetic kidney disease

Objective: Potentially inappropriate medications (PIM) contribute to poor outcomes in older patients, making it a widespread health problem. The study explored the occurrence and risk factors of PIM in older diabetic kidney disease (DKD) patients during hospitalization and investigated whether polypharmacy was associated with it. Methods: Retrospective analysis of the patients ≥ 65 years old diagnosed with DKD from July to December 2020; the PIM was evaluated according to the American Beers Criteria (2019). Factors with statistical significance in univariate analysis were included in Logistic multivariate analysis to explore the potential risk factors related to PIM. Results: Included 186 patients, 65.6% of patients had PIM, and 300 items were confirmed. The highest incidence of PIM was 41.7% for drugs that should be carefully used by the older, followed by 35.3% that should be avoided during hospitalization. The incidence of PIM related to diseases or symptoms, drug interactions to avoid, and drugs to avoid or reduce dose for renal insufficiency patients were 6.3%, 4.0% and 12.7%, respectively. The medications with a high incidence of PIM were diuretics (35.0%), benzodiazepines (10.7%) and peripheral ɑ1 blockers (8.7%). Compared with hospitalization, there were 26% of patients had increased PIM at discharge. Multivariate Logistic regression analysis showed that polypharmacy during hospitalization was an independent risk factor for PIM, OR = 4.471 (95% CI: 2.378, 8.406). Conclusion: The incidence of PIM in hospitalized older DKD patients is high; we should pay more attention to the problem of polypharmacy in these patients. Pharmacists identifying the subtypes and risk factors for PIM may facilitate risk reduction for older DKD patients.

Potentially Inappropriate Medications among Elderly with Frailty in a Tertiary Care Academic Medical Centre in Saudi Arabia

This study aims to assess the prevalence of potentially inappropriate medications (PIMs) and to analyze the relationship between the PIMs and frailty among inpatient older adults aged 65 and above in Saudi Arabia. A retrospective cross-sectional study design was utilized during the period between April 2021 and April 2022 of all patients aged 65 years and above admitted in a public tertiary hospital in Saudi Arabia. Data on the number of medications and the use of PIMs were assessed using Beers’ criteria while the frailty status was assessed using the “FRAIL Scale”. Of the 358 patient files that were reviewed, 52.2% were males, 60.9% were aged 65−74 years, and 82% were married. The prevalence of robust, prefrail, and frail patients was 5%, 36.9%, and 58.1%, respectively. According to the 2019 Beers criteria, a total of 45.8% (n = 164) participants identified as using PIMs. Compared to the non-PIMs group, the PIMs group demonstrated significant differences in the number of medications (p < 0.001), the number of comorbidities (p < 0.05), and the frailty score (p < 0.001). The strongest predictor of PIM use was a number of comorbidities, recording an odds ratio of 2.86, (95% CI 1.21−6.77, p < 0.05). Our results show that the use of PIM was significantly associated with frail older adults with multiple comorbidities and in patients with polypharmacy. A clear assessment and evaluation tool may improve the quality of drug treatment in the older adult population, particularly in frail patients.

Characterization of potentially inappropriate medication prescriptions for the elderly in primary care and hospital settings

Background

Polypharmacy cannot be defined numerically due to its varied definitions, and inclusion of comorbidities aggravates the dilemma, creating challenges for the healthcare system and the patients' course of treatment. The introduction of the potentially inappropriate medication (PIM) list developed by the American Geriatrics Society (AGS) (AGS Beers Criteria®; updated in 2019) was deemed a solution. However, several risk factors are associated with PIMs, including increased emergency room visits, hospitalization and mortality, and a decline in daily activity. Differences in PIM prescription rates have been reported; however, with the recent Beers criteria update, the number of patients exposed to PIMs is expected to increase significantly due to the addition of new medications to the list.

Objectives

This study aimed to describe the characteristics of PIM prescriptions for the elderly in primary care and hospital settings.

Methods

Medications for elderly patients prescribed in our hospital between 2016 and 2019 were reviewed and sorted based on Beers criteria to identify patients with the most PIMs. Correlations were made between gender and facility.

Results

This study included 40,168 patients (51% males). The total and average numbers of PIM per elderly patient were 260,753 and 6.5, respectively. Proton pump inhibitors were prescribed the most, followed by nonsteroidal anti-inflammatory drugs.

Conclusions

We found that increasing numbers of PIMs are prescribed to the elderly in our healthcare facilities. Therefore, further recommendations from local geriatric communities and the implementation of reminders for physicians through electronic prescription systems are needed to decrease the rate of prescribed PIMs.

Frailty and potentially inappropriate medications using the 2019 Beers Criteria: findings from the Australian Longitudinal Study on Women's Health (ALSWH)

BACKGROUND

Frailty is an essential consideration with potentially inappropriate medications (PIMs), especially among older women.

AIMS

This study determined the use of potentially inappropriate medications according to frailty status using the Beers Criteria 2019, identified medications that should be flagged as potentially inappropriate and harmful depending on individual health factors, and determined the association between frailty and PIMs, adjusted for characteristics associated with PIMs.

METHODS

This prospective longitudinal study included 9355 participants aged 77-82 years at baseline (2003). Frailty was measured using the FRAIL (fatigue, resistance, ambulation, illness and loss of weight) scale. Generalised estimating equations using log-binomial regressions determined the association between frailty and risk of using PIMs.

RESULTS

Among participants who were frail and non-frail at baseline, the majority used ≥ 3 PIMs (74.2% and 58.5%, respectively). At 2017, the proportion using ≥ 3 PIMs remained constant in the frail group (72.0%) but increased in the non-frail group (66.0%). Commonly prescribed medications that may be potentially inappropriate in both groups included benzodiazepines, proton-pump inhibitors and non-steroidal anti-inflammatory drugs, and risperidone was an additional contributor in the non-frail group. When adjusted for other characteristics, frail women had a 2% higher risk of using PIMs (RR 1.02; 95% CI 1.01, 1.03).

CONCLUSION

Given that the majority of frail women were using medications that may have been potentially inappropriate, it is important to consider both frailty and PIMs as indicators of health outcomes, and to review the need for PIMs for women aged 77-96 years who are frail.

The association between physician knowledge and inappropriate medications for older populations

BACKGROUND

Older patients are often prescribed potentially inappropriate medications (PIMs) given their age. We measured the association between a physician's general knowledge and their PIM prescribing.

METHODS

Using a 2013-2017 cross-sectional design, we related a general internist's knowledge (n = 8196) to their prescribing of PIMs to fee-for-service Medicare beneficiaries, age ≥ 66 years with part D coverage, which they saw in the outpatient setting the year after their exam (n = 875,132). Physician knowledge was based on the American Board of Internal Medicine's (ABIM) Internal Medicine Maintenance of Certification (IM-MOC) exam scores. Medications included 72 PIMs from the American Geriatric Society's Beers Criteria and appropriate alternatives to these medications. Logistic regressions controlled for physicians practice/training characteristics and patient-risk factors.

RESULTS

Annually, 11.0% of patients received a PIM and 57.2% received an appropriate alternative medication. Patients seen by physicians scoring in the top versus bottom quartile were 8.6% less likely (95% confidence interval [CI]: -12.7 to -4.5, p < 0.001) to be prescribed a PIM and 4.7% more likely (95% CI: 1.7 to 7.6, p = 0.001) to be prescribed an appropriate alternative medication. The difference in PIM prescribing grew to 12.1% fewer (95% CI: -15.1 to -9.1) patients when limiting the sample to the 58.9% of patients being prescribed a PIM or appropriate alternative medication. Among patients receiving any medication, this was similar to the percent difference in PIM prescribing between solo and large practices (≥50 physicians, -10.2%, 95% CI: 13.6-6.5, p < 0.001) or between group and academic practices (-11.7%, 95% CI: -15.3 to -7.9, p < 0.001). PIM prescribing was more positively associated with patient characteristics including age, gender, and total number of medications prescribed.

CONCLUSIONS

Better physician general knowledge, as measured by an ABIM exam, was associated with fewer PIM prescriptions. Future research should examine whether general educational interventions, such as MOC, effect PIM prescribing.

Effectiveness of interventions aiming to reduce inappropriate drug prescribing: an overview of interventions

Objective

Inappropriate prescribing of drugs is associated with unnecessary harms for patients and healthcare costs. Interventions to reduce these prescriptions are widely studied, yet the effectiveness of different types of interventions remains unclear. Therefore, we provide an overview regarding the effectiveness of intervention types that aim to reduce inappropriate drug prescriptions, unrestricted by target drugs, population or setting.

Methods

For this overview, systematic reviews (SRs) were used as the source for original studies. EMBASE and MEDLINE were searched from inception to August 2018. All SRs aiming to evaluate the effectiveness of interventions to reduce inappropriate prescribing of drugs were eligible for inclusion. The SRs and their original studies were screened for eligibility. Interventions of the original studies were categorized by type of intervention. The percentage of interventions showing a significant reduction of inappropriate prescribing were reported per intervention category.

Key findings

Thirty-two SRs were included, which provided 319 unique interventions. Overall, 61.4% of these interventions showed a significant reduction in inappropriate prescribing of drugs. Strategies that were most frequently effective in reducing inappropriate prescribing were multifaceted interventions (73.2%), followed by interventions containing additional diagnostic tests (antibiotics) (70.4%), computer interventions (69.2%), audit and feedback (66.7%), patient-mediated interventions (62.5%) and multidisciplinary (team) approach (57.1%). The least frequently effective intervention was an education for healthcare professionals (50.0%).

Conclusion

The majority of the interventions were effective in reducing inappropriate prescribing of drugs. Multifaceted interventions most frequently showed a significant reduction of inappropriate prescribing. Education for healthcare professionals is the most frequently included intervention in this overview, yet this category is least frequently effective.

Evaluation of psychotropic medications use among elderly with psychiatric disorders in Saudi Arabia

AIMS

Potentially inappropriate psychotropic medications (PIPMs) prescribed to older adults with psychiatric disorders can inadvertently affect their health. The use of standards and guidelines can ensure prudent prescribing and minimize the risk of morbidities. This study assessed the pattern and prevalence of prescription of PIPMs to older individuals in outpatient psychiatric settings in Saudi Arabia, using the updated 2015 Beers criteria, as well as the probability of polypharmacy.

METHODS

The study was conducted in the outpatient psychiatric clinics of the only psychiatric hospital in Jazan region of Saudi Arabia. A retrospective cross-sectional review of electronic medical records was undertaken during 2018 to assess PIPM use and psychotropic polypharmacy. Descriptive statistics were generated and associations between PIPM use and baseline characteristics were assessed using multivariable logistic regression.

RESULTS

Overall, 68% of 1300 older adults received PIPMs, and 77.7% were on psychotropic polypharmacy. Amitriptyline, chlorpromazine, and trifluoperazine were extensively prescribed. Paroxetine (1.2%) and benzodiazepines were prescribed to a smaller proportion of the patients. Elderly with schizophrenia (AOR = 0.046, p < 0.001) and anxiety (AOR = 0.530, p = 0.036) were significantly less likely to have PIPMs than those with dementia. Likewise, elderly with depression and anxiety were less likely to have psychotropic polypharmacy as compared to those with dementia.

CONCLUSION

A substantial number of the elderly received PIPMs possibly based on implicit criteria. It is therefore important to provide mental health care providers in the region with educational programs to increase their awareness of PIPMs.

Potentially Inappropriate Medication Use and Hard Braking Events in Older Drivers

Potentially inappropriate medications (PIMs) identified by the American Geriatrics Society should generally be avoided by older adults because of ineffectiveness or excess risk of adverse effects. Few studies have examined the effects of PIMs on driving safety measured by prospectively and objectively collected driving data. Data for this study came from the Longitudinal Research on Aging Drivers study, a multisite naturalistic driving study of older adults. Multivariable negative binominal modeling was used to estimate incidence rate ratios and 95% confidence intervals of hard braking events (proxies for unsafe driving behavior defined as events with a deceleration rate ≥0.4 g) associated with PIM use among older drivers. The study sample consisted of 2932 drivers aged 65-79 years at baseline, including 542 (18.5%) who used at least one PIM. These drivers were followed through an in-vehicle recording device for up to 44 months. The overall incidence of hard braking events was 1.16 per 1000 miles. Use of PIMs was associated with a 10% increased risk of hard braking events. Compared to drivers who were not using PIMs, the risk of hard braking events increased 6% for those using one PIM, and 24% for those using two or more PIMs. Use of PIMs by older adult drivers is associated in a dose-response fashion with elevated risks of hard braking events. Reducing PIM use in older adults might help improve driving safety as well as health outcomes.

Prescription Medication Use in Older Adults Without Major Cardiovascular Disease Enrolled in the Aspirin in Reducing Events in the Elderly (ASPREE) Clinical Trial

BACKGROUND

Efforts to minimize medication risks among older adults include avoidance of potentially inappropriate medications. Contemporary analysis of medication use in community-dwelling older people compared with the general population is lacking.

PARTICIPANTS

A total of 19,114 community-dwelling adults in Australia and the United States aged 70 years or older (65 years or older for U.S. minorities) without histories of major cardiovascular disease, cognitive impairment, or disability participated in a randomized, placebo-controlled trial of aspirin: ASPirin in Reducing Events in the Elderly study. Measurements Prescribed baseline medications obtained by self-report and medical record review were grouped by World Health Organization Anatomic and Therapeutic Chemical category. Potentially inappropriate medications were defined using a modified American Geriatrics Society Beers Criteria. Polypharmacy was defined as 5 or more medications, and hyperpolypharmacy defined as 10 or more medications. Cross-sectional descriptive statistics and adjusted odds ratios were computed.

RESULTS

The median number of prescription medications per participant was three, regardless of age. Women had a higher medication prevalence. Cardiovascular drugs (primarily antihypertensives) were the most commonly reported (64%). Overall, 39% of the cohort reported taking at least one potentially inappropriate medication, with proton-pump inhibitors being the most commonly reported (21.2% of cohort). Of the cohort, 27% had polypharmacy, and 2% hyperpolypharmacy. Age 75 years or older, less than 12 years of education, hypertension, diabetes mellitus, chronic kidney disease, frailty, gastrointestinal complaint, and depressive symptoms were associated with an increased likelihood of potentially inappropriate medications and polypharmacy. For almost all medication classes, prevalence was equivalent or lower than the general older population.

CONCLUSION

Overall medication burden and polypharmacy are low in older adults free of major cardiovascular disease, disability, and cognitive impairment. The prevalence of potentially inappropriate medications is higher than previously reported and similar to more vulnerable populations as a result of the introduction of proton-pump inhibitors to the American Geriatrics Society Beers Criteria. Longitudinal follow-up is required to further understand the balance of benefits and risks for potentially inappropriate medications and polypharmacy in community-dwelling older people.

Medication use and driving patterns in older drivers: preliminary findings from the LongROAD study

Background

The potential for impaired driving due to medication use can occur at any age, though older adults are more likely to take multiple prescribed medications and experience side effects that may affect driving ability. The purpose of this study was to characterize the relationship between medications and driving safety behaviors.

Methods

Data for this study came from the five-site Longitudinal Research on Aging Drivers (LongROAD) project. Participants were active drivers, age 65–79 years at enrollment, and patients at one of the 5 participating sites. Medication names and doses were obtained at baseline based on the “brown-bag review” method. Medications were coded using the American Hospital Formulary Service system. Driving data were collected by a GPS accelerometer installed in the study participants’ main vehicles.

Results

Medication data were available for 2949 (98.6%) of the 2990 participants, and 2898 (96.9% of all participants) had both medication data and at least 30 recorded days of driving. The median number of medications taken per study participant was seven, with a range of 0–51. Total number of medications was significantly associated with a higher rapid deceleration rate. Certain medication classes were significantly associated with other driving outcomes, including central nervous system agents (more speeding events), hormones and gastrointestinal medications (more rapid decelerations), electrolytes (fewer rapid decelerations), and antihistamines (greater right to left turn ratio).

Conclusions

Older adult drivers are taking large quantities of prescription and non-prescription medications that may affect their driving safety. Certain medication classes are associated with potentially adverse driving patterns, such as speeding and rapid decelerations, while others are associated with potentially protective maneuvers, such as right hand turning. Further research is warranted to identify and mitigate potential adverse effects of such medications on driving safety in older adults.