Prospective Randomized Controlled Pilot Study of High-Intensity Lightbox Phototherapy to Prevent ICU-Acquired...

Area of Science:

• Critical Care Medicine
• Sleep Medicine
• Neurology

Background:

• Disturbed circadian rhythms are implicated in intensive care unit (ICU)-acquired delirium.
• Bright light therapy (BLT) improves sleep and cognition in non-critical patients, but its ICU efficacy is unclear.

Purpose of the Study:

• To evaluate the impact of daily high-intensity phototherapy on ICU delirium incidence and duration.
• To assess if bedside BLT can deter delirium in critically ill patients.

Main Methods:

• A single-center, prospective randomized pilot study involving adult ICU patients.
• Intervention: 30-minute daily bedside BLT (10,000 lux) starting at 0700.
• Control: Standard hospital lighting. Delirium assessed using Confusion Assessment Method for the ICU.

Main Results:

• No significant difference in delirium incidence between BLT (18%) and control (17.5%) groups.
• No difference in delirium-free and coma-free days (median 28 days) between groups.
• Bedside BLT did not significantly alter ICU delirium incidence in patients with Sequential Organ Failure Assessment Score >3.

Conclusions:

• Daily morning BLT alone was not associated with a significant reduction in ICU-acquired delirium incidence or duration.
• Further studies should investigate a combined approach of daytime BLT and minimized nighttime light exposure.
• Understanding circadian rhythm's role in ICU delirium requires a more comprehensive light exposure strategy.