Potentially inappropriate prescribing in older people with dementia in care homes : a retrospective analysis
Background: Older people in general and care home residents in particular are at high risk of suboptimal or inappropriate prescribing. To date, research into potentially inappropriate prescribing (PIP) has not focused on care home residents and/or has not utilized the recently developed and validated Screening Tool of Older Persons' potentially inappropriate Prescriptions (STOPP) criteria. Objective: The aim of this study was to estimate the prevalence of PIP in older people with dementia living in six residential care homes in England, using the STOPP criteria. Methods: A retrospective analysis was conducted using medication data collected for older people with dementia in six residential care homes in England who participated in the prospective, longitudinal EVIDEM - End of Life (EoL) study. Of the 133 residents recruited to the study, medication administration records were available for and reviewed at two timepoints (approximately 16 weeks apart) for 119 residents and 110 residents, respectively. The prevalence of PIP at these timepoints was determined using 31 of the 65 STOPP criteria applicable when there is no access to residents' medical records. Results: At the first timepoint, 68 potentially inappropriate medications (PIMs) were identified. Fifty-five residents (46.2%) were prescribed one or more PIM(s), eleven (9.2%) were prescribed two or more PIMs and two (1.7%) were prescribed three PIMs. Thirteen of the 31 STOPP criteria utilized in this study (41.9%) were used to identify PIP. Long-term (i.e. >1 month) neuroleptics (antipsychotics) were the most frequently prescribed PIMs (n = 25; 21.0%), followed by non-steroidal anti-inflammatory drugs (NSAIDs) for >3 months, proton pump inhibitors (PPIs) at maximum therapeutic dosage for >8 weeks, tricyclic antidepressants (TCAs) in patients with dementia and long-term (i.e. >1 month), long-acting benzodiazepines. At the second timepoint, 57 PIMs were identified; 45 residents (40.9%) were prescribed one or more PIM(s) and 10 (9.1%) were prescribed two or more PIMs, but only one resident (0.9%) was prescribed three PIMs. Of the 31 STOPP criteria utilized in this study, ten (32.3%) were used to identify PIP. Long-term (i.e. >1 month) antipsychotics were again the most frequently prescribed PIMs (n = 21; 19.1%), followed by PPIs at maximum therapeutic dosage for >8 weeks, NSAIDS for >3 months and TCAs in patients with dementia. A significant correlation was found at both timepoints between the number of medicines prescribed and occurrence of PIP. Conclusions: This study found that over two-fifths of older people with dementia residing in six residential care homes in England were prescribed at least one PIM at each timepoint. Long-term (i.e. >1 month) antipsychotics, NSAID use for >3 months and PPI use at maximum therapeutic dosage for >8 weeks were the most prevalent PIMs. Regular medication review that targets, but is not limited to, these medications is required to reduce PIP in the residential care home setting. The STOPP criteria represent a useful tool to facilitate such review in this patient population.