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Ketamine for Post-operative Analgesia in Hemorrhoidectomy

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT04248205
Recruitment Status : Not yet recruiting
First Posted : January 30, 2020
Last Update Posted : March 5, 2020
Information provided by (Responsible Party):
University of Oklahoma

Brief Summary:
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.

Condition or disease Intervention/treatment Phase
Hemorrhoids Drug: Ketamine Phase 4

Detailed Description:

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.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 100 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Primary Purpose: Treatment
Official Title: Intra-operative Use of Ketamine for Post-Operative Analgesia in Patients Undergoing Hemorrhoidectomy: A Prospective, Randomized Controlled Trial.
Estimated Study Start Date : April 3, 2020
Estimated Primary Completion Date : January 31, 2022
Estimated Study Completion Date : July 28, 2022

Resource links provided by the National Library of Medicine

Drug Information available for: Ketamine

Arm Intervention/treatment
Active Comparator: Intraoperative ketamine infusion
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
Standard general anesthesia PLUS ketamine will be given for post-operative analgesia

No Intervention: Control group
This group will only receive the standard anesthesia during surgery with no ketamine.

Primary Outcome Measures :
  1. Change in post-operative narcotic usage [ Time Frame: two weeks post-operation ]
    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.

Secondary Outcome Measures :
  1. Change in post-op pain [ Time Frame: Post-op days 1, 3, 5, 7, and 10 ]
    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".

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 100 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Adults aged 18-100
  • Undergoing a hemorrhoidectomy for Grade III or IV hemorrhoids.

Exclusion Criteria:

  • Inability to undergo general anesthesia
  • Contraindications to hemorrhoidectomy
  • History of schizophrenia or other hallucinatory psychiatric illnesses
  • History of psychosis
  • Chronic narcotic usage defined as either having a pain contract with a pain management specialist and no narcotic usage for one month prior to hemorrhoidectomy.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT04248205

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Contact: Steven N Carter, MD 405-271-8001 ext 55000
Contact: Theresa J Lander 405271-8001 ext 43230

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United States, Oklahoma
OU Medical Center
Oklahoma City, Oklahoma, United States, 73104
Sponsors and Collaborators
University of Oklahoma
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Principal Investigator: Steven N Carter, MD University of Oklahoma

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Responsible Party: University of Oklahoma Identifier: NCT04248205    
Other Study ID Numbers: 11475
First Posted: January 30, 2020    Key Record Dates
Last Update Posted: March 5, 2020
Last Verified: March 2020
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by University of Oklahoma:
post operative pain
Additional relevant MeSH terms:
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Rectal Diseases
Intestinal Diseases
Gastrointestinal Diseases
Digestive System Diseases
Vascular Diseases
Cardiovascular Diseases
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents
Anesthetics, Dissociative
Anesthetics, Intravenous
Anesthetics, General
Excitatory Amino Acid Antagonists
Excitatory Amino Acid Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action