Does remimazolam anesthesia lower the risk of Postoperative Delirium compared to other drugs?
Postoperative delirium (POD) is a common complication after surgery, especially in older adults. Remimazolam is a newer, ultra-short-acting sedative that some hoped might reduce delirium risk. However, the best available research does not show a clear benefit over other drugs. Large meta-analyses and randomized trials find no significant difference in POD rates between remimazolam and propofol, and one study suggests remimazolam may actually increase risk compared to dexmedetomidine.
What the research says
A 2025 systematic review and meta-analysis of 30 trials (including 25 RCTs) found no significant difference in delirium incidence between remimazolam (11.4%) and non-remimazolam anesthesia (15.2%) overall, with a risk ratio of 0.81 (95% CI 0.63–1.05, p=0.11) 1. However, in a subgroup of patients receiving general anesthesia, remimazolam was associated with a 23% reduction in delirium risk 1. Another meta-analysis focusing specifically on remimazolam versus propofol in general anesthesia included 6 RCTs with 1107 patients and found no difference in POD incidence (OR 0.92, 95% CI 0.58–1.44) 8. A prospective RCT in older adults undergoing orthopedic surgery also reported no significant difference: 15.6% with remimazolam vs 12.4% with propofol (risk ratio 1.26, 95% CI 0.72–2.21, p=0.42) 9.
When compared to dexmedetomidine, a retrospective study in elderly patients undergoing lower extremity orthopedic surgery under spinal anesthesia found that remimazolam was associated with a significantly higher risk of POD within 5 days (15.8% vs 9.7%, adjusted OR 2.02, 95% CI 1.05–3.89, p=0.036) 10. This suggests that dexmedetomidine may be a better choice for sedation in this population.
Other factors also influence POD risk. Preoperative psychological factors like depression and anxiety are linked to higher POD rates 2. Nutritional status matters too: a low Geriatric Nutritional Risk Index (GNRI) increases POD risk (RR 1.62, 95% CI 1.34–1.96) 4. Age over 65, male sex, alcohol use, smoking, and insomnia are additional risk factors 3. These findings highlight that delirium prevention involves more than just drug choice.
What to ask your doctor
- Given my age and health, what is my personal risk of postoperative delirium?
- If I need sedation, would dexmedetomidine be a safer option than remimazolam for preventing delirium?
- Should I be screened for nutritional risk (like low GNRI) before surgery to help lower delirium risk?
- How will my anxiety or depression be managed before and after surgery to reduce delirium risk?
- What non-drug approaches, such as early mobilization or family involvement, are used at your hospital to prevent delirium?
This question is drawn from common patient questions about this topic and answered using cited medical research. We do not provide individualized advice.