A Phase 4 interventional study of Ketamine in Hemorrhoids, sponsored by University of Oklahoma. Recruiting at 1 site in United States. Open to participants aged 18 Years to 100 Years. Per ClinicalTrials.gov, last updated 2026-04-01.
Sponsored by University of Oklahoma · Phase 4, Interventional, and Treatment
This is a prospective, randomized study of ketamine versus no ketamine in approximately 100 patients undergoing hemorrhoidectomy for Grade III or IV hemorrhoids. The participants will be blinded to which treatment arm they are assigned, because participants will be under anesthesia when the ketamine is administered. The investigators will know whether the participant receives ketamine or not.
Participants will be randomized into 2 groups: intraoperative ketamine infusion during operation or routine anesthesia with no ketamine. Participants are pre-medicated in the operating room with the same regimen: Gabapentin 300mg, Ultram 50mg, and Tylenol 1000mg.
For participants in the ketamine group, a pain dose of ketamine 0.3mg/kg IV bolus dosing will be given prior to incision. If the procedure lasts longer than 1 hour, an additional bolus dose will be given. All participants will undergo general anesthesia and receive routine anesthesia care, aside from ketamine verus no ketamine. All participants will also receive standard local anesthesia including a local regional perianal nerve block.
The procedure will be performed by three different surgeons, with the surgery done the same way using ligasure hemorrhoidectomy. Participants will all be sent home with the same post-operative instructions and pain medications to include: Tylenol 1000mg, oxycodone 5mg, ibuprofen 800mg, fiber/miralax, and tub baths twice daily for 15 minutes.
A patient pain handout will be given to participants upon discharge with instructions to rate pain according to a numeric rating scale and the Wong-Baker FACES pain scale. Participants will be contacted by a member of the research team to assess their post-operative pain based on a numeric rating scale. All participants will undergo post-operative clinic follow-up at 2 weeks post-operation. At that time they will be instructed to bring their oxycodone bottle to assess how many pills the participant required. The clinic medical assistant will count the number of remaining pills and record this in the electronic medical record. If a participant forgets their pain scale record or medications, a post-operative phone interview will be performed after the clinic appointment to gather this information.
The investigators will randomize 50 participants to the ketamine group and 50 participants to the placebo group. Study will take place until all participants have been analyzed, approximately 8-12 months. Randomization will occur using a statistical method with study arms placed into individual envelopes that will be stored at the University of Oklahoma (OU) Surgery Center. The investigator will blindly pull an envelope from the stack which will identify the participant's treatment arm. The participants will be blinded and not informed of their arm of the study as to not create bias toward subjective pain. Practitioners will not be blinded for ease of medication administration. The procedures will occur at OU Surgery Center by one of three surgeons. Anesthesiologists will administer ketamine based on study arm.
238 studies on the registry are indexed under Hemorrhoids; 73 are open to participants now.
This study's planned enrollment of 100 is close to the median of 100 across 183 interventional studies indexed under Hemorrhoids.
Browse Hemorrhoids studies →University of Oklahoma is the lead sponsor of 432 studies on the registry; 100 are open to participants now.
Of its 42 completed or terminated interventional studies of FDA-regulated products, 16 (38%) have results posted.
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Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Contraindication
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Subjects in this group will receive standard anesthesia during surgery and a dose of ketamine at 0.3 mg/kg IV bolus prior to surgical incision. If the procedure lasts more than 1 hour, an additional bolus dose will be given.
Drug: Ketamine
This group will only receive the standard anesthesia during surgery with no ketamine.
Standard general anesthesia PLUS ketamine will be given for post-operative analgesia
Change in post-operative narcotic usage
Standardized pain control regimen with ketamine; at two week surgical follow-up visit patient will bring their oxycodone prescription and we will count the number of pills that were taken.
Time frame: two weeks post-operation
Change in post-op pain
Wong-Baker FACES Pain Rating Scale, which ranges from 0 to 10, with 0 being represented by a happy face indicating "No Hurt" to 10, represented by a crying face, indicating "hurts like the worst pain imaginable".
Time frame: Post-op days 1, 3, 5, 7, and 10
Plan to share: No
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Studies of the drug tested here: Ketamine