Ramelteon for Decreasing Delirium in Surgical Intensive Care Unit Patients

Abstract

In intensive care unit (ICU) patients, delirium contributes to prolonged hospitalization, long-term cognitive impairment and increased mortality. Sleep disturbance, a risk factor for delirium, has been attributed to impaired melatonin secretion in critically ill patients. Ramelteon, a synthetic melatonin receptor agonist, is indicated for insomnia; there is limited, but growing evidence, to support its use for the prevention of delirium. The primary objective of this study is to describe the use of ramelteon and the incidence of delirium, assessed by Confusion Assessment Method for the ICU (CAM-ICU) scores, in adult surgical ICU patients from May 22, 2016 to June 30, 2018. The primary endpoint is the number of delirium free days in the week prior to and post first ramelteon administration. A total of 231 patients were included in the study with 201 (87%) positive for delirium at least once during the study timeframe. The median number of CAM-ICU negative days in the week pre-ramelteon administration was 4 days (IQR 2-7 days) compared to 6 days (IQR 3-7 days) in the week post-first ramelteon administration ( P < .05). The time to CAM-ICU positive increased slightly to 3 days (IQR 1-7 days) following ramelteon initiation compared to 2 days (IQR 1-5 days) from initial ICU admission. Additionally, the median number of antipsychotic doses per patient decreased from 4 doses (IQR 1.25-14 doses) prior to ramelteon to 2 doses (IQR 1-4 doses) after ramelteon. Ramelteon administration was associated with a greater number of CAM-ICU negative days in surgical ICU patients. These findings describe a potential role for ramelteon in mitigating delirium in this patient population.