Topical Versus Oral Metronidazole Following Excisional Haemorrhoidectomy
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|ClinicalTrials.gov Identifier: NCT03343509|
Recruitment Status : Recruiting
First Posted : November 17, 2017
Last Update Posted : April 17, 2019
This study aims to determine if topical metronidazole reduces pain more than oral metronidazole following excisional haemorrhoidectomy. The trial will be a multi-centered, patient and investigator blinded superiority trial with two parallel groups and a primary outcome of pain scores during 14 days after surgery.
Group A will receive oral metronidazole and placebo cream. Group B will receive placebo tablets and topical metronidazole cream.
|Condition or disease||Intervention/treatment||Phase|
|Hemorrhoids Postoperative Pain||Drug: Metronidazole Oral Drug: Metronidazole Ointment Drug: Placebo Oral Tablet Drug: Placebo Ointment||Phase 4|
The pathogenesis of post-operative excisional haemorrhoidectomy pain is multi-factorial with secondary bacterial colonisation, inflammation and anal sphincter spasm/hypertonicity all purposed to play a role. Several pharmacological agents have been introduced in the last two decades targeting specific parts of the hypothesized pathway of pain pathogenesis showing promising improvements.
Metronidazole is part of the nitroimidazole class of antibiotics and primarily affects anaerobic bacteria and protozoa and traditionally has been used in surgical prophylaxis and treating anaerobic infections. It has been postulated to decrease pain following EH via two mechanisms; first by decreasing secondary bacterial colonisation and hence reducing post-operative inflammation; and second via a hitherto poorly understood direct anti-inflammatory response. The oral route has been initially investigated but topical administration has more recently been mooted for analgesia and theoretically reduces the unpleasant systemic side effects of oral administration. Our research group has recently completed a systematic review of both oral and topical administration of metronidazole. This review showed benefit in reducing postoperative haemorrhoidectomy pain from both routes of administration but this far there has been no comparison of the two routes.
Metronidazole has been proposed to have both anti-bacterial and pleiotropic anti-inflammatory properties but its precise mechanism of action is unknown. The increased understanding of this novel use of an agent with a known pharmacological profile will generally broaden our use of a simple, cheap and widespread agent. The investigators hope research into this drug will enable its use beyond that of haemorrhoidectomies, with possible pleiotropic applications into other similar operations.
Given the high prevalence of haemorrhoids in a vital segment of New Zealand's population, this research will contribute to improved outcomes for affected patients. Decreasing the significant post-operative pain will improve the quality of life for New Zealanders as well as affected populations worldwide. Socially and financially, it will enable earlier return to normal activity and reduce the burden on visits and readmissions to primary and secondary care, respectively.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||120 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)|
|Official Title:||A Prospective, Multicentre, Double-Blinded Randomised Controlled Trial Comparing Topical Versus Oral Metronidazole in Reducing Post-Operative Pain Following Excisional Haemorrhoidectomy|
|Actual Study Start Date :||March 11, 2019|
|Estimated Primary Completion Date :||June 2020|
|Estimated Study Completion Date :||December 2020|
Experimental: Group A - Oral
Oral metronidazole 400mg 3 times a day for 7 days Placebo ointment applied 3 time times a day for 7 days to affected region
Drug: Metronidazole Oral
Drug: Placebo Ointment
Experimental: Group B - Topical
Topical metronidazole ointment 10% 3 times a day for 7 days Oral placebo tablets 3 times a day for 7 days
Drug: Metronidazole Ointment
Drug: Placebo Oral Tablet
- Daily Post-Operative Pain [ Time Frame: Day 7 ]Daily Post-Operative Pain Measured on Visual Analogue Scale (0 to 10)
- Total Analgesia Use [ Time Frame: Day 7 ]Measured in Morphine Equivalent Doses
- Complication Rates [ Time Frame: Day 30 ]Short term complication rates including adverse reactions, bleeding, paraesthesiae, urinary retention, readmission
- Return to Normal Activity [ Time Frame: Day 30 (Followed up until returned back to normal) ]Time to return back to normal activity
- Return of Bowel Function [ Time Frame: Day 7 ]Time for first bowel motion
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 ClinicalTrials.gov identifier (NCT number): NCT03343509
|Contact: Weisi Xia, MBChBemail@example.com|
|Principal Investigator:||Andrew G Hill, MBChB||The University of Auckland|