Modification in ICU Design May Affect Delirium and Circadian Melatonin: A Proof of Concept Pilot Study.
Level 3 - non-randomized controlled study
Prospective non-randomized controlled cohort study
PubMed 38112493 · doi:10.1097/CCM.0000000000006152
What was done
In a prospective observational cohort pilot study at a single university hospital, researchers evaluated the impact of a multicomponent ICU room redesign featuring stress-relief modifications and dynamic lighting versus standard rooms. They observed 74 mechanically ventilated adult ICU patients with an expected stay of at least 48 hours. Patients were assessed prospectively every 8 hours for depth of sedation, delirium, and pain using validated scores. Blood samples for serum melatonin profiles were collected every 4 hours for up to three 24-hour periods.
What was found
Delirium developed in 46% (n = 17) of patients in the modified rooms compared with 76% (n = 28) in standard rooms (p = 0.017). Patients in standard rooms had higher delirium severity compared to those in modified rooms (odds ratio = 2.292; 95% CI, 1.582-3.321; p < 0.0001). Light intensity significantly influenced the course of serum melatonin (p < 0.0001), with significant interaction effects over time between standard and modified rooms (p < 0.001).
Why it matters
This study provides proof-of-concept evidence that nonpharmacologic environmental adaptations, particularly dynamic lighting, can modulate circadian melatonin levels and reduce the incidence and severity of ICU delirium.
Limits
The study was a non-randomized observational pilot with a small sample size (n = 74) conducted in only two modified rooms at a single center. The multicomponent intervention prevents isolating the specific effect of dynamic lighting from other structural modifications, and room assignment was not randomized.
Cited by
- supports ICU psychosis is a transient condition caused in part by lack of natural sunlight and circadian disruption in intensive care units, which typically resolves once the patient leaves the hospital.