Length of stay is related to inpatient antipsychotic use in Alzheimer type dementia at a large US based tertiary care hospital.

Abstract

AbstractBackgroundAntipsychotic(AP) medications carry a black box warning for increased risk of death in the elderly and should be used judiciously in a dementia population. Studies have shown that encounters with healthcare facilities increase the risk of AP exposure1. We wanted to know how admissions at our institution impacted antipsychotic use in patients with Alzheimer’s disease. Here we describe the results of a retrospective analysis of inpatient antipsychotic use in patients with Alzheimer’s disease at Northwestern Memorial Hospital(NMH), Chicago IL.MethodOur cohort was generated using NMH’s Enterprise Data Warehouse, including patients over 65 with a chart diagnosis of AD admitted to the hospital for over 48hrs between May 2005 and March 2018. We excluded patients with schizophrenia, schizotypal disorder, bipolar disorder, or psychotic illness due to primary psychiatric disease, enrollment in hospice, presence of tracheostomy or PEG‐tube and pervasive developmental disorder.Result1712 patients were admitted for a total of 4603 admissions amounting to 25,721 hospital days during the period of analysis. Demographic information is provided in Table 1. A higher proportion of admissions were four days or longer in encounters with an antipsychotic(Figure 1). Though longer LOS becomes progressively less common, this trend continued through a LOS of 20 days. When comparing LOS for encounters with an AP in the home medication list to encounters without, there was no impact on LOS. However, when comparing encounters with an AP prescribed while inpatient to encounters without, inpatient AP administration was associated with a longer length of stay (Table 2).ConclusionThese findings indicate that a longer LOS is associated with antipsychotic use. Because a longer length of stay was associated with new antipsychotic use but not the continuation of a home antipsychotic, our findings suggest that length of stay may contribute to behavioral and psychological symptoms of dementia requiring pharmacological treatment.1. Koponen M, Lavikainen P, Taipale H, et al. Accumulation of Hospital Days Among Antipsychotic Initiators With Alzheimer’s Disease. J Am Med Dir Assoc. 2019;20(12):1488‐1494.e3. https://doi.org/10.1016/j.jamda.2019.07.009