Drug combination may reduce delirium after heart surgery, but evidence certainty is low
A network meta-analysis ranked dexmedetomidine with melatonin highest for preventing postoperative delirium, while calling for stronger evidence.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Dexmedetomidine combined with melatonin had a lower estimated risk of postoperative delirium than placebo and ranked highest among the studied interventions. However, the review rated this evidence as low certainty. The finding concerns a specific surgical setting and does not establish a best treatment or a general benefit from melatonin.
The central comparison had low-certainty evidence. The abstract does not provide absolute delirium rates or sufficient information about harms to assess the overall balance of benefit and risk.
What researchers found
Postoperative delirium incidence
After cardiac surgery, dexmedetomidine plus melatonin had an estimated 0.31 times the placebo risk; credible limits were 0.13 to 0.69 times that risk. These compare relative risks, not absolute probabilities. Observation windows were unreported; evidence certainty was low.
What the interval describes
The credible interval describes uncertainty around the relative risk under the Bayesian model. Without underlying event rates, this abstract-based explanation cannot say how many patients would avoid delirium.
Rankings need qualification
The analysis compared and ranked drug strategies, but a leading rank does not eliminate uncertainty. The authors called for stronger trials; evidence for other candidates was also low or very low certainty.
The original publication
Effect of peri-operative pharmacological interventions on postoperative delirium in patients having cardiac surgery: a systematic review and Bayesian network meta-analysis.
Queiroz I, Barbosa LM, Gallo Ruelas M et al.
Anaesthesia · 2026
- PubMed ID
- 40888048
- Record checked
AI-assisted research and writing. This explains one selected publication; it is not a complete review of everything known. Our approach.
One more question, understood.
Keep track of the research you’ve explored.