Mode
Text Size
Log in / Sign up

Intraoperative intravenous methadone reduces 24-h pain intensity and opioid consumption after cardiac surgeryMethadone May Reduce Pain After Cardiac Surgery

AI-generated summary of the cited source, checked by automated accuracy review. How we work

Key Takeaway
Consider intraoperative intravenous methadone for reduced pain intensity and opioid consumption after cardiac surgery.

This meta-analysis evaluated the impact of intraoperative intravenous methadone compared to conventional opioid-based regimens in adult patients undergoing cardiac surgery. The analysis included 10,203 patients to assess pain management and related outcomes during the first 24 hours postoperatively.

The synthesis indicates that methadone is associated with lower postoperative 24-h pain intensity (SMD -0.44; 95% CI -0.71 to -0.17; p = 0.001) and lower 24-h opioid consumption (SMD -0.72; 95% CI -1.35 to -0.23; p = 0.02). Additionally, reintubation was less frequent in the methadone group (RR 0.75; 95% CI 0.58 to 0.96; p = 0.02), and nausea and vomiting were slightly less frequent (RR 0.96; 95% CI 0.93 to 1.00; p = 0.04) in cohort studies.

Several outcomes, including time to first rescue morphine, time to extubation, ICU length of stay, and hospital length of stay, showed no statistically significant differences. The authors note substantial heterogeneity and inconsistent findings between randomized and retrospective studies as primary limitations. Due to these factors and incomplete reporting of safety outcomes, the certainty of evidence is low.

How this fits prior evidence

This finding extends the existing evidence regarding perioperative management for cardiac surgery patients. Specifically, it adds to the established use of multimodal pharmacological and behavioral strategies to manage perioperative sleep in cardiac surgery patients by providing specific data on methadone's role in pain intensity and opioid consumption reduction during the first 24 hours postoperatively.

A large review of data from over 10,000 adult patients looked at how using intravenous methadone during heart surgery affects recovery. The study compared methadone to standard opioid treatments for managing pain after the procedure.

The findings suggest that patients who received methadone reported lower levels of pain and used less total opioid medication during their first 24 hours of recovery. Some data also indicated these patients were less likely to need reintubation or experience nausea and vomiting, though results varied between different types of studies.

It is important to note that the evidence for some benefits is not very certain because the study included many different types of research with inconsistent results. Because the findings are based on a mix of observational and experimental data, they may not be consistent for every patient. Talk to your surgical team about how these medications might fit into your specific care plan.

What this means for you:
Methadone may lower pain and opioid use after heart surgery, but evidence is limited by inconsistent study results.

Common questions

Does methadone reduce pain after heart surgery?

The study found that patients who received intravenous methadone during surgery reported lower pain intensity during the first 24 hours of recovery. However, because the evidence is based on a mix of different types of studies with inconsistent results, the certainty of this finding is considered low.

Does methadone reduce the amount of other opioids used?

Patients who received methadone during surgery were shown to have lower opioid consumption during their first 24 hours of recovery. This suggests it may help manage pain while potentially reducing the need for other medications.

Are there side effects like nausea or vomiting?

Some studies showed that patients using methadone had slightly less frequent instances of nausea and vomiting compared to others. However, because reporting on safety was incomplete in some parts of the study, you should discuss specific risks with your doctor.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedAug 2026
View Original Abstract ↓
ObjectivesTo evaluate the analgesic efficacy and safety of intraoperative intravenous methadone compared with conventional opioid-based analgesic regimens in adult patients undergoing cardiac surgery, using data derived from randomized controlled trials and retrospective cohort studies.MethodsA comprehensive retrieval of scholarly literature was implemented in Embase, MEDLINE, PubMed, Web of Science, and the Cochrane Library until November 28, 2025. Randomized controlled trials and retrospective cohort studies comparing intraoperative methadone with other opioid analgesics for pain management in patients undergoing cardiac surgical procedures were eligible for inclusion in this meta-analysis. Quality of included studies was independently evaluated by two reviewers, with randomized controlled trials assessed using the Cochrane Risk of Bias tool (version 2.0) and cohort studies appraised using the Newcastle-Ottawa Scale. The primary outcome was postoperative pain intensity at 24 h. Secondary outcomes included postoperative 24-h opioid consumption, time to first rescue morphine administration, time to extubation, ICU length of stay, hospital length of stay, and reported adverse outcomes, including postoperative nausea, vomiting, and postoperative reintubation.ResultsEight studies, including 4 randomized controlled trials and 4 retrospective cohort studies, involving 10,203 patients were included. Compared with conventional opioid analgesics, intraoperative methadone was associated with lower postoperative 24-h pain intensity (SMD, −0.44; 95% CI − 0.71 to −0.17; p = 0.001, I2 = 77%). Methadone was also associated with lower postoperative 24-h opioid consumption in the primary analysis (SMD, −0.72; 95% CI, −1.35 to −0.23; p = 0.02; I2 = 97%), No statistically significant differences were observed for overall time to first rescue morphine administration, time to extubation, ICU length of stay, or hospital length of stay. In randomized controlled trials, methadone was not associated with significant differences in postoperative nausea or vomiting, whereas reintubation was less frequent in the methadone group (RR, 0.75; 95% CI, 0.58 to 0.96; p = 0.02). In retrospective cohort studies, postoperative nausea and vomiting were slightly less frequent with methadone (RR, 0.96; 95% CI, 0.93 to 1.00; p = 0.04), but the magnitude of this association was small.ConclusionIn adult patients undergoing cardiac surgery, intraoperative intravenous methadone may be associated with lower pain intensity and reduced opioid consumption during the first 24 h after surgery. However, substantial heterogeneity, inconsistent findings between randomized and retrospective studies, and incomplete reporting of key safety outcomes limit the certainty of the evidence. These findings should be interpreted cautiously, and further adequately powered randomized trials with standardized analgesic protocols and safety monitoring are needed.Systematic review registrationhttps://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD420251237093, identifier (CRD420251237093).
Free Newsletter

Clinical research that matters. Delivered to your inbox.

Join thousands of clinicians and researchers. No spam, unsubscribe anytime.