Trial reportCritical care medicine2019
Ramelteon for Prevention of Postoperative Delirium: A Randomized Controlled Trial in Patients Undergoing Elective Pulmonary Thromboendarterectomy.
Trial report in Critical care medicine, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 32 papers, 9 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
32 citing papers in PubMed, 9 syntheses or guidelines pooled it, 66 citations in OpenAlex.
- Effectiveness and safety of melatoninergic agonists in preventing delirium in the ICU: an updated dose‒response meta-analysis of randomized controlled trials.Critical care (London, England) · 2026Pooled it
- Melatonin supplementation reduces delirium incidence in critically ill patients: a systematic review and meta-analysis.Frontiers in pharmacology · 2026Pooled it
- Pooled it
- Efficacy and safety of perioperative melatonin for postoperative delirium in patients undergoing surgery: a systematic review and meta-analysis.The Journal of international medical research · 2024Pooled it
- Effects of melatonin on postoperative sleep quality: a systematic review, meta-analysis, and trial sequential analysis.Canadian journal of anaesthesia = Journal canadien d'anesthesie · 2023Pooled it
- Does melatonin administration reduce the incidence of postoperative delirium in adults? Systematic review and meta-analysis.BMJ open · 2023Pooled it
- Melatonin and aggressive behavior: A systematic review of the literature on preclinical and clinical evidence.Journal of pineal research · 2022Pooled it
- Melatonin and Its Analogs for Prevention of Post-cardiac Surgery Delirium: A Systematic Review and Meta-Analysis.Frontiers in cardiovascular medicine · 2022Pooled it
- Melatonin Receptor Agonists for the Prevention of Delirium: An Updated Systematic Review and Meta-Analysis of Randomized Controlled Trials.Current neuropharmacology · 2022Pooled it
- Melatonin for preventing postoperative delirium in elderly patients: A multicenter randomized placebo-controlled pilot study.Medicine · 2025Trial
- Efficacy of melatonin in decreasing the incidence of delirium in critically ill adults: a randomized controlled trial.Critical care science · 2024Trial
- Actigraphy-based sleep and activity measurements in intensive care unit patients randomized to ramelteon or placebo for delirium prevention.Scientific reports · 2023Trial
- Prevention of delirium with agitation by yokukansan in older adults after cancer surgery.Japanese journal of clinical oncology · 2022Trial
- Effects of Ramelteon on the Prevention of Postoperative Delirium in Older Patients Undergoing Orthopedic Surgery: The RECOVER Randomized Controlled Trial.The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry · 2021Trial
- Article
- Perioperative sleep management in cardiac surgery: an evidence-oriented narrative review of pharmacological, behavioral, and respiratory support strategies.Frontiers in cardiovascular medicine · 2026Review
- Optimizing Sleep Hygiene in the Hospital Environment.Sleep medicine clinics · 2025Review
- Article
- Total Joint Arthroplasty and Sleep: The State of the Evidence.Arthroplasty today · 2024Article
- Melatonin and Melatonin Agonists for Prevention of Delirium in the Cardiac Surgical ICU: A Meta-analysis.Indian journal of critical care medicine : peer-reviewed, official publication of Indian Society of Critical Care Medicine · 2023Article
Corrections and comments
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Authors and funding
13 authors at 1 institution in 1 country.
Funding
Abstract
objectivesTo assess the efficacy of ramelteon in preventing delirium, an acute neuropsychiatric condition associated with increased morbidity and mortality, in the perioperative, ICU setting.
designParallel-arm, randomized, double-blinded, placebo-controlled trial.
settingAcademic medical center in La Jolla, California. PATIENTS: Patients greater than or equal to 18 years undergoing elective pulmonary thromboendarterectomy.
interventionsRamelteon 8 mg or matching placebo starting the night prior to surgery and for a maximum of six nights while in the ICU. MEASUREMENTS AND MAIN
resultsIncident delirium was measured twice daily using the Confusion Assessment Method-ICU. The safety outcome was coma-free days assessed by the Richmond Agitation-Sedation Scale. One-hundred twenty participants were enrolled and analysis completed in 117. Delirium occurred in 22 of 58 patients allocated to placebo versus 19 of 59 allocated to ramelteon (relative risk, 0.8; 95% CI, 0.5-1.4; p = 0.516). Delirium duration, as assessed by the number of delirium-free days was also similar in both groups (placebo median 2 d [interquartile range, 2-3 d] vs ramelteon 3 d [2-5 d]; p = 0.181). Coma-free days was also similar between groups (placebo median 2 d [interquartile range, 1-3 d] vs ramelteon 3 d [2-4 d]; p = 0.210). We found no difference in ICU length of stay (median 4 d [interquartile range, 3-5 d] vs 4 d [3-6 d]; p = 0.349), or in-hospital mortality (four vs three deaths; relative risk ratio, 0.7; 95% CI, 0.2-3.2; p = 0.717), all placebo versus ramelteon, respectively.
conclusionsRamelteon 8 mg did not prevent postoperative delirium in patients admitted for elective cardiac surgery.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.