Intravenous sub-anesthetic ketamine for perioperative analgesia.
Andrew W Gorlin, David M Rosenfeld, Harish Ramakrishna
https://pubmed.ncbi.nlm.nih.gov/27275042/Actively Recruiting
Led by University of Oklahoma · Updated on 2026-04-01
100
Participants Needed
1
Research Sites
25 weeks
Total Duration
Researchers are evaluating the use of ketamine for pain relief after surgery in patients undergoing hemorrhoidectomy for Grade III or IV hemorrhoids. This prospective, randomized study compares intraoperative ketamine infusion with no ketamine in about 100 patients. Participants will not know which treatment they receive, but the doctors will, to examine the differences in post-operative pain and narcotic use. Participants are randomly assigned to one of two groups one receives a ketamine dose of 0.3 mgkg intravenously before surgery and an additional dose if the procedure lasts longer than one hour, along with standard general anesthesia and local nerve block. The other group receives standard anesthesia without ketamine. All participants receive pre-medications including Gabapentin, Ultram, and Tylenol, and will have surgery performed by one of three surgeons using the same ligasure hemorrhoidectomy method. During and after surgery, participants will track their pain using numeric and facial scales and will be contacted for pain assessments on several post-operative days. Follow-up occurs at two weeks post-surgery to count remaining narcotic pills and review recovery. Data collected include narcotic use and pain levels over 10 days. The study aims to analyze these outcomes after all participants complete follow-up, expected over 8 to 12 months.
CONDITIONS
Ketamine for Post-operative Analgesia in Hemorrhoidectomy
S
Steven N Carter, MD
Explore thousands of other clinical trials that might be a better match.
Sign up to get personalized trial recommendations delivered to your inbox.
Already have an account? Log in here
University of Oklahoma
Lead Sponsor
This table compares participation in this trial with other options available for this condition. The information is drawn from published research and the trial’s study details and is provided for educational purposes only.
| Factors | Ketamine Infusion + General Anesthesia | Standard General Anesthesia Only |
|---|---|---|
| What is it? | Intraoperative ketamine infusion is an additional medication given during surgery, along with standard general anesthesia, to potentially enhance post-operative pain control. | Standard general anesthesia without ketamine represents routine anesthesia care during hemorrhoidectomy. |
| Role in trial | Tested as an adjunct to standard anesthesia to assess its effect on pain and post-operative narcotic use. | Serves as the control group receiving typical anesthesia without additional agents. |
| Primary use | Evaluated for reducing post-operative pain and opioid usage after hemorrhoidectomy. | Provides routine anesthesia for surgery and serves as a comparison for evaluating new pain control methods. |
| How it is given or performed | Ketamine is given as an intravenous infusion during the procedure along with all standard anesthesia medications. | General anesthesia is administered according to routine surgical protocols, without adding ketamine. |
| Evidence status | Evidence from several studies suggests that intraoperative ketamine may reduce post-operative pain and opioid use for surgical patients, but large-scale data in hemorrhoidectomy are limited and under study. | General anesthesia without ketamine serves as the standard perioperative pain management method in similar surgeries. |
| Important limitations | Possible side effects of ketamine can include hallucinations or other psychiatric effects, and its use in patients with psychiatric illness is limited. Data on its routine use in hemorrhoidectomy is still being gathered. | General anesthesia alone may not always provide optimal pain control after hemorrhoidectomy, leading to use of opioids and their associated risks. |
Disclaimer: This comparison is created with the help of artificial intelligence(AI) and may contain errors or missing information. It is not medical advice and does not mean one option is better or safer than another. Clinical trials are still being studied, and joining a trial is your choice. Please consult your healthcare professional before making any decisions.
You may qualify if you...
You will not qualify if you...
Duration - 2 to 4 weeks
Participants are screened for eligibility to participate in the trial.
1 visit (in-person)
Duration - Surgery day
Participants undergo hemorrhoidectomy surgery with general anesthesia. Those randomized to the ketamine group receive an intraoperative ketamine infusion for post-operative pain management, while the control group receives standard anesthesia without ketamine.
1 visit (in-person surgery and anesthesia administration)
Duration - 2 weeks
Participants follow post-operative care instructions at home, including pain medication and self-monitoring of pain. They are contacted by the research team to assess pain levels and attend a post-operative clinic visit at 2 weeks for medication usage assessment and further pain evaluation.
1 clinic visit and multiple phone contacts for pain assessment
Study Type
INTERVENTIONAL
Masking
SINGLE
Allocation
RANDOMIZED
Model
PARALLEL
Primary Purpose
TREATMENT
Number of Arms
2
Have more questions? Get in touch with our team for quick support
Andrew W Gorlin, David M Rosenfeld, Harish Ramakrishna
https://pubmed.ncbi.nlm.nih.gov/27275042/Sabine Himmelseher, Marcel E Durieux
https://pubmed.ncbi.nlm.nih.gov/15618805/Tonny Stone Luggya, Tony Roche, Lameck Ssemogerere...
https://pubmed.ncbi.nlm.nih.gov/29062346/University of Oklahoma
Lead Sponsor