Pre-Emptive Analgesia in Ano-Rectal Surgery

Hemorrhoids Clinical Trial

— PEAARS  

Official title:

Pre-Emptive Analgesia in Ano-Rectal Surgery

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02402543
• Other study ID #: CHRMS: M13-226
• Status: Completed
• Phase: N/A
• First received: March 25, 2015
• Last updated: January 11, 2018
• Start date: June 2014
• Est. completion date: May 2017

Study information

• Verified date: January 2018
• Source: University of Vermont
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The perianal region is the region around the anus. Administering a pain medication before a surgery starts is called preemptive analgesia. In some studies, this technique has been shown to be an effective way to reduce the pain that a patient experiences in the post-operative timeframe to a greater extent than would be expected simply from the pain medications alone. One theory of why this occurs suggests that the preemptive analgesia desensitizes brain and nerves to pain, thereby decreasing the response to painful stimuli, like surgery when they occur. This leads to a decrease in the amount of narcotic pain medication required after the procedure, which leads to less side effects and a quicker return to normal functioning. As perianal surgeries do not usually include a long stay in the hospital, controlling post-procedure pain is a priority.

The use of preemptive analgesia is in other types of surgeries, such as orthopedics, is well established, but as the perianal region has not been well studied, its use is not the standard of care. This type of analgesia uses a combination of medications that are already in use for post-operative and non-operative pain control and administers them orally prior to the patient undergoing general anesthesia. The side effects of the medications are the same as if they had been given after surgery or for non-surgical pain.

The concept of preemptive analgesia is established in other types of surgeries and it has solid basic science to support its use. The purpose of this randomized, double-blind, placebo controlled study is to determine if patients undergoing perianal surgeries could benefit from preemptive pain control. The primary outcome will be whether patients experience less post-operative pain. Patient post-operative consumption and latency until use of narcotic pain medication will be the secondary outcomes. The investigators believe that the patients receiving pain medications before their operation will require less pain medication after surgery, with minimal increased risk to the patient.

Description:

Despite advances in pain medicine, postoperative pain control remains problematic with over 5% of patients experiencing severe pain despite standard of care pain management, and is a frequently cited reason for delayed discharge in outpatient procedures [1]. In anorectal surgeries, almost all patients experience mild-to-moderate postoperative subjective pain [2], and as an example 12% of patients report severe postoperative pain during their recovery from hemorrhoidectomy surgery [3]. Control of postoperative pain is an important goal. Preemptive analgesia is a technique that involves premedicating the patient with a regimen of medications designed to target different points in the pain cascade to prevent central and peripheral sensitization to pain, also known as "wind-up" [4]. The activation of N-methyl-D-aspartate (NMDA) receptors is an identified process that occurs in central sensitization after a noxious stimulus. By pharmacologically blocking these receptors, it may be possible to prevent or suppress the degree of central sensitization, which can prevent the hyperalgesic, or exaggerated pain response, that some patients experience [5]. Peripheral sensitization is a similar concept and occurs due to noxious stimuli in the periphery, such as a surgical incision. This type of sensitization has typically been prevented with regional anesthesia and by increasing the nociceptive threshold of the neurons with different medications.

Preemptive analgesia focusing on the effect of single medications on pain control has shown promising results, however some studies appear to lend themselves to practice [6-19] better than others [20-26]. On the other hand, multimodal pain control regimens might be more promising. A search of the literature reveals that preemptive pharmacological blockade of wind up has been effectively used in both surgical and nonsurgical patients (burn patients [27]). In patients undergoing hip arthroplasty, or hip replacement surgery, under general anesthesia, blocking both central and peripheral sensitization results in significantly decreased subjective pain, and a trend toward less postoperative use of analgesics [28]. Similarly, patients undergoing multilevel spinal surgeries [29] and those undergoing prostatic surgery [30] under general anesthesia consume less postoperative analgesics when undergoing multimodal preemptive pain control by blocking both sensitization pathways. Finally, preemptive central sensitization blockade alone has been used with trends in improved pain control for gynecological surgeries under both general [31] and regional anesthesia [32]. The preemptive use of such medications has not been studied for anorectal surgeries and it is what we are suggesting in this study. Most pain control studies in the literature focus on postoperative rather than preemptive medication regimens for pain management [33-35], and there is no current standard of care as to an effective regimen. The studies effective in decreasing postoperative pain in other surgical contexts, such as for patients undergoing hip arthroplasty, have used the same combination of medications proposed for the Treatment Group. Finally, the added benefit of the anorectal patient population in terms of the putative decreased use of opioids for postoperative pain control revolves around the opioid-related adverse effects on bowel function. In fact, return of bowel movements and regularity is one criterion for healing after surgery.

Based on this existing literature, we propose in our current study to preemptively block both central sensitization through the use of intravenous ketamine perioperatively and peripheral sensitization through the use of intravenous dexamethasone administered perioperatively and oral gabapentin and acetaminophen administered preoperatively. Ketamine is a noncompetitive NMDA receptor antagonist acting centrally in the dorsal horn of the spinal cord to decrease the release of glutamate, reducing the transmission of pain messages centrally [36]. Intravenous ketamine has been shown to decrease 24-hour opioid requirements, and preemptive use of ketamine was part of the medications used in most of the studies mentioned in the literature review above. As it currently stands, use of ketamine in anorectal surgeries as an added analgesic has been proven safe. Among Nigerian surgery patients having received regional anesthesia and preemptive ketamine, postoperative pain levels have been shown to decrease, however it is unclear if this patient cohort included anorectal surgery patients [37]. No other studies have been conducted regarding postoperative pain in these patients [38]. By utilizing ketamine as one of the medications in our study, we hope to show similar effects resulting in patients experiencing decreased postoperative pain after common anorectal surgeries.

Dexamethasone is a corticosteroid with potent anti-inflammatory effects that is also used as an anti-emetic. The proposed mechanism of action of dexamethasone is not completely known, but it is thought to involve inhibition of prostaglandin synthesis and an increased release of endorphins. Endorphins are endogenous peptides that bind to pain receptors in the body to decrease pain. In addition, endorphins can facilitate mood elevation and a sense of well-being. Intravenous dexamethasone was part of the medications used in studies mentioned in the literature review above. One study investigating the prophylactic use of dexamethasone for its anti-emetic properties, in combination with sevoflurane, a general anesthetic, during anorectal surgery found a significant decrease in maximal postoperative VAS pain scores in patients administered dexamethasone compared to those given placebos [2]. The use of dexamethasone as a preemptive analgesic has not been fully studied in anorectal surgery patients.

Gabapentin acts by binding to receptors on voltage-gated calcium channels on presynaptic nerves, reducing the entry of calcium into presynaptic nerve terminals. The subsequent decreased release of excitatory neurotransmitters such as glutamate, aspartate, substance P, and norepinephrine into the synaptic cleft is linked to a diminished postsynaptic transmission of neural pain messages [36]. It is usually used for neuropathic pain control, and has been used in some of the studies mentioned in the literature review above. A systemic review of the perioperative effects of gabapentin found that it is an effective means of reducing post-operative pain, opioid consumption, and opioid-related adverse effects in surgical patients. In fact, administration of a single dose of gabapentin was found to be equivalent to a reduction of 30 mg of morphine in the first 24 hours after surgery [39]. No studies have been conducted, to the best of our knowledge, regarding preemptive use of gabapentin in anorectal surgeries.

Local, peripheral sensitization has also been minimized through the use of non-steroidal anti-inflammatory drugs (NSAIDs) due to the decreased production of certain molecules such as prostaglandins and kinins. The enzyme required to make these molecules is blocked by acetaminophen and NSAIDs, which is why acetaminophen is included in this study in hopes of demonstrating better pain control among anorectal surgery patients. Acetaminophen is a weak analgesic that forms the most basic component of a multimodal analgesia regimen [36]. Oral preemptive use of acetaminophen has been proven to decrease postoperative narcotic use in surgical patients [40], and has been used in some of the studies mentioned in the literature review above. A related intramuscular NSAID, namely Toradol, has been used preemptively among anorectal surgical patients with good pain control [41]. No other studies are reported in this patient population.

Of importance, the combinations of the medications used in this study have been used in other studies before with similar or higher doses and no significant differences in terms of hemodynamic variables (such as vital signs) or adverse side effects have been noted compared to control groups [31]. In fact, these medications are safely used at UVM Medical Center by the collaborating surgeons as part of their care for other surgeries such as abdominal surgeries.

*References 1-41 available upon request

Recruitment information / eligibility

• Status: Completed
• Enrollment: 90
• Est. completion date: May 2017
• Est. primary completion date: May 2017
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Patients having anal fistula repairs for anal fistulas recalcitrant to non-surgical management at the University of Vermont Medical Center or Fanny Allen Campuses OR

• Patients having anal sphincterotomies for chronic anal fissures recalcitrant to non-surgical management at the University of Vermont Medical Center or Fanny Allen Campuses OR

• Patients having hemorrhoidectomies for hemorrhoids recalcitrant to non-surgical management at the University of Vermont Medical Center or Fanny Allen Campuses OR

• Patients having anal condyloma excisions for anal condylomas recalcitrant to non-surgical management at the University of Vermont Medical Center or Fanny Allen Campuses

• Patients undergoing these surgeries must be American Society of Anesthesiologists (ASA) Physical Status Classification System scores of I (normal, healthy patient), II (patient with mild, systemic disease), or III (patients with more significant disease)

Exclusion Criteria:

• Allergies to any study medications;

• Patient history and chart review for existence of hepatic or renal failure;

• Chronic pain syndrome;

• Inability to understand or utilize the Numerical Rating Scale (NRS);

• Pregnancy;

• Patients currently on gabapentin, pregabalin or narcotics

• Patients taking chronic steroids, unable to taper off before surgery

Related Conditions & MeSH terms

• Anal Condyloma
• Fissure in Ano
• Fistula
• Hemorrhoids
• Rectal Fistula

Intervention

Drug:
• Gabapentin

• Ketamine
Prior to the incision in the operating room, the anesthesiologist administers 0.15 mg/kg of ketamine IV push in patients randomized to the experimental arm, only.
• Acetaminophen

• Dexamethasone
Prior to the incision in the operating room, the anesthesiologist administers 8 mg of dexamethasone IV push in patients randomized to the experimental arm, only.
• Placebo

Locations

Country	Name	City	State
United States	University of Vermont Medical Center	Burlington	Vermont
United States	University of Vermont Medical Center Fanny Allen Campus	Colchester	Vermont

Sponsors (2)

Lead Sponsor	Collaborator
University of Vermont	American Society of Colon and Rectal Surgeons

Country where clinical trial is conducted

United States, 

References & Publications (41)

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Canbay O, Karakas O, Celebi N, Peker L, Coskun F, Aypar U. The preemptive use of diclofenac sodium in combination with ketamine and remifentanil does not enhance postoperative analgesia after laparoscopic gynecological procedures. Saudi Med J. 2006 May;27(5):642-5. — View Citation

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Holthusen H, Backhaus P, Boeminghaus F, Breulmann M, Lipfert P. Preemptive analgesia: no relevant advantage of preoperative compared with postoperative intravenous administration of morphine, ketamine, and clonidine in patients undergoing transperitoneal tumor nephrectomy. Reg Anesth Pain Med. 2002 May-Jun;27(3):249-53. — View Citation

Jirasiritham S, Tantivitayatan K, Jirasiritham S. Perianal blockage with 0.5% bupivacaine for postoperative pain relief in hemorrhoidectomy. J Med Assoc Thai. 2004 Jun;87(6):660-4. — View Citation

Kara I, Tuncer S, Erol A, Reisli R. [The effects of preemptive dexketoprofen use on postoperative pain relief and tramadol consumption]. Agri. 2011 Jan;23(1):18-21. Turkish. — View Citation

Khalili G, Janghorbani M, Saryazdi H, Emaminejad A. Effect of preemptive and preventive acetaminophen on postoperative pain score: a randomized, double-blind trial of patients undergoing lower extremity surgery. J Clin Anesth. 2013 May;25(3):188-92. doi: 10.1016/j.jclinane.2012.09.004. Epub 2013 Apr 6. — View Citation

Kiliçkan L, Toker K. The effect of preemptive intravenous morphine on postoperative analgesia and surgical stress response. Panminerva Med. 2001 Sep;43(3):171-5. — View Citation

Kwok RF, Lim J, Chan MT, Gin T, Chiu WK. Preoperative ketamine improves postoperative analgesia after gynecologic laparoscopic surgery. Anesth Analg. 2004 Apr;98(4):1044-9, table of contents. — View Citation

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Mathiesen O, Dahl B, Thomsen BA, Kitter B, Sonne N, Dahl JB, Kehlet H. A comprehensive multimodal pain treatment reduces opioid consumption after multilevel spine surgery. Eur Spine J. 2013 Sep;22(9):2089-96. doi: 10.1007/s00586-013-2826-1. Epub 2013 May 17. — View Citation

MENDELL LM, WALL PD. RESPONSES OF SINGLE DORSAL CORD CELLS TO PERIPHERAL CUTANEOUS UNMYELINATED FIBRES. Nature. 1965 Apr 3;206:97-9. — View Citation

Menkiti ID, Desalu I, Kushimo OT. Low-dose intravenous ketamine improves postoperative analgesia after caesarean delivery with spinal bupivacaine in African parturients. Int J Obstet Anesth. 2012 Jul;21(3):217-21. doi: 10.1016/j.ijoa.2012.04.004. Epub 2012 Jun 1. — View Citation

Ng WT. Re: laparoscopic repair of colonoscopic perforations. Surg laparosc endosc percutan tech. 2006;16:49-51. Surg Laparosc Endosc Percutan Tech. 2007 Feb;17(1):68-9; author reply 69. — View Citation

Poylin V, Quinn J, Messer K, Nagle D. Gabapentin significantly decreases posthemorrhoidectomy pain: a prospective study. Int J Colorectal Dis. 2014 Dec;29(12):1565-9. doi: 10.1007/s00384-014-2018-4. Epub 2014 Oct 1. — View Citation

Radhakrishnan M, Bithal PK, Chaturvedi A. Effect of preemptive gabapentin on postoperative pain relief and morphine consumption following lumbar laminectomy and discectomy: a randomized, double-blinded, placebo-controlled study. J Neurosurg Anesthesiol. 2005 Jul;17(3):125-8. — View Citation

Rasmussen ML, Mathiesen O, Dierking G, Christensen BV, Hilsted KL, Larsen TK, Dahl JB. Multimodal analgesia with gabapentin, ketamine and dexamethasone in combination with paracetamol and ketorolac after hip arthroplasty: a preliminary study. Eur J Anaesthesiol. 2010 Apr;27(4):324-30. doi: 10.1097/EJA.0b013e328331c71d. — View Citation

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Romej M, Voepel-Lewis T, Merkel SI, Reynolds PI, Quinn P. Effect of preemptive acetaminophen on postoperative pain scores and oral fluid intake in pediatric tonsillectomy patients. AANA J. 1996 Dec;64(6):535-40. — View Citation

Stubhaug A, Breivik H, Eide PK, Kreunen M, Foss A. Mapping of punctuate hyperalgesia around a surgical incision demonstrates that ketamine is a powerful suppressor of central sensitization to pain following surgery. Acta Anaesthesiol Scand. 1997 Oct;41(9):1124-32. — View Citation

Sun MY, Canete JJ, Friel JC, McDade J, Singla S, Paterson CA, Counihan TC. Combination propofol/ketamine is a safe and efficient anesthetic approach to anorectal surgery. Dis Colon Rectum. 2006 Jul;49(7):1059-65. — View Citation

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Trabulsi EJ, Patel J, Viscusi ER, Gomella LG, Lallas CD. Preemptive multimodal pain regimen reduces opioid analgesia for patients undergoing robotic-assisted laparoscopic radical prostatectomy. Urology. 2010 Nov;76(5):1122-4. doi: 10.1016/j.urology.2010.03.052. Epub 2010 Jun 8. — View Citation

Vinson-Bonnet B, Coltat JC, Fingerhut A, Bonnet F. Local infiltration with ropivacaine improves immediate postoperative pain control after hemorrhoidal surgery. Dis Colon Rectum. 2002 Jan;45(1):104-8. — View Citation

Wang Q, Li Z, Wang ZP, Cui C. [Preemptive analgesic effect of parecoxib sodium in patients undergoing laparoscopic colorectal surgery]. Nan Fang Yi Ke Da Xue Xue Bao. 2010 Nov;30(11):2556-7. Chinese. — View Citation

Wnek W, Zajaczkowska R, Wordliczek J, Dobrogowski J, Korbut R. Influence of pre-operative ketoprofen administration (preemptive analgesia) on analgesic requirement and the level of prostaglandins in the early postoperative period. Pol J Pharmacol. 2004 Sep-Oct;56(5):547-52. — View Citation

Wu JI, Lu SF, Chia YY, Yang LC, Fong WP, Tan PH. Sevoflurane with or without antiemetic prophylaxis of dexamethasone in spontaneously breathing patients undergoing outpatient anorectal surgery. J Clin Anesth. 2009 Nov;21(7):469-73. doi: 10.1016/j.jclinane.2008.11.007. — View Citation

Yeh CC, Jao SW, Huh BK, Wong CS, Yang CP, White WD, Wu CT. Preincisional dextromethorphan combined with thoracic epidural anesthesia and analgesia improves postoperative pain and bowel function in patients undergoing colonic surgery. Anesth Analg. 2005 May;100(5):1384-9, table of contents. — View Citation

Zielinski J, Jaworski R, Smietanska I, Irga N, Wujtewicz M, Jaskiewicz J. A randomized, double-blind, placebo-controlled trial of preemptive analgesia with bupivacaine in patients undergoing mastectomy for carcinoma of the breast. Med Sci Monit. 2011 Oct;17(10):CR589-97. — View Citation

* Note: There are 41 references in all — Click here to view all references

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Postoperative pain	Pain will be evaluated using numerical rating scales at specified intervals from the end of surgery up to 7 days postoperatively and mailed back to the investigators. The pain levels will be compared between groups.	End of surgery up to 7 days postoperatively
Secondary	Narcotic consumption	Narcotic consumption will be recorded by the subject on medication diaries attached to the respective numerical rating scale. This helps to identify at which time point the patient took a narcotic. This will be compared between groups.	End of surgery up to 7 days postoperatively
Secondary	Interval for rescue pain medication	On the aforementioned medication diaries, the patient will record when he or she first needed break through pain medication (i.e. the narcotic prescribed) beyond the scheduled pain medicines. This will help us evaluate the interval between end of the operation and first need for breakthrough pain medication. This number will be compared between groups.	End of surgery up to 7 days postoperatively
Secondary	Further pain requirements	By examining the medication diaries, we will be able to evaluate if there were patients who required more than the scheduled pain medications and breakthrough narcotic. This number will be compared between groups.	End of surgery up to 7 days postoperatively