Clinical Studies on Hemorrhoid & Fistula Treatments: A Review

Clinical Studies on Hemorrhoid & Fistula Treatments: A Review

I. Introduction

Hemorrhoids and anal fistulas are prevalent anorectal conditions that significantly impact patients' quality of life. Hemorrhoids, characterized by swollen veins in the rectum or anus, affect a substantial portion of the global population, with an estimated prevalence ranging from 2.9% to 29.7% [1]. Anal fistulas, on the other hand, are abnormal channels connecting the anal canal or rectum to the perianal skin, often resulting from abscesses. These conditions present considerable clinical challenges due to their diverse manifestations, potential for recurrence, and the need for treatments that preserve anal function while effectively resolving the pathology [2]. This review aims to provide a comprehensive overview of current clinical studies and recent advancements in the treatment of both hemorrhoids and anal fistulas, targeting both patients seeking information and healthcare professionals looking for updated evidence-based practices. It is crucial to note that this article is intended for informational purposes only and does not constitute medical advice. Readers should always consult with a qualified healthcare professional for diagnosis and treatment of any medical condition.

II. Hemorrhoid Treatments: A Clinical Review

The management of hemorrhoids has evolved significantly, encompassing a range of conservative, office-based, and operative interventions. The selection of the most appropriate treatment is often complex, given the continuous emergence of new techniques and the variability in patient presentation.

A. Conservative Approaches

Conservative treatments primarily focus on symptomatic relief and are often the first line of management for milder cases. Recent research has explored isolating active ingredients from traditional herbal remedies to develop new products and understand their mechanisms of action. For instance, phlebotonics, such as micronized purified flavonoid fraction, have demonstrated efficacy in preventing recurrence and alleviating post-hemorrhoidectomy symptoms [1]. Emerging techniques include polyherbal formulations like AnoSpray, which has shown potential in suppressing inflammatory cytokines, and extracts like *Sageretia theezans*, which affect gene expression related to inflammation [1].

B. Office-Based Treatments

Office-based procedures are typically suitable for Grade I-II hemorrhoids and some Grade III cases, offering less invasiveness than surgical options.

• **Rubber Band Ligation (RBL):** RBL remains a widely used and effective office treatment. Recent studies have investigated modified RBL techniques, such as those employing negative pressure and elastic coils, which have shown benefits in reducing postoperative pain, bleeding, and urinary retention compared to traditional excisional hemorrhoidectomy (MMH) [1]. The use of polymer clips, like the BANANA-Clip, has also demonstrated advantages in terms of delayed bleeding rates and higher one-year success rates [1].

• **Sclerotherapy:** Sclerotherapy involves injecting a sclerosant solution to induce fibrosis and shrinkage of hemorrhoidal tissue. While traditional sclerotherapy has been compared to RBL, the advent of new sclerosants, particularly polidocanol in foam form, has garnered attention. Studies have shown high patient satisfaction and pain reduction with 2% polidocanol foam for Grade II-IV hemorrhoids [1]. However, concerns regarding potential anaphylactic shock with polidocanol necessitate further validation of its safety and efficacy [1]. Sclerobanding, a combination of RBL and polidocanol foam sclerotherapy, has also shown promise in reducing complications and recurrence, even in patients on anticoagulant therapy [1].

• **Infrared Coagulation (IRC):** IRC, which uses heat to coagulate hemorrhoidal tissue, is gradually being replaced by alternative energy-based methods due to advancements in technology [1].

C. Operative Treatments

Operative treatments are generally reserved for more advanced hemorrhoidal disease (Grade III-IV) or cases refractory to conservative and office-based approaches.

• **Excisional Hemorrhoidectomy (EH):** EH, including Milligan-Morgan and Ferguson hemorrhoidectomy, is effective for symptomatic external or Grade III-IV internal hemorrhoids. However, it is associated with significant postoperative pain and potential complications such as urinary retention, anal stenosis, and fecal incontinence [1].

• **Stapled Hemorrhoidopexy (SH):** SH offers less pain than EH but may have a higher recurrence rate and unique complications like rectovaginal fistulas and strictures. Modified SH techniques, such as the Tissue Selecting Technique (TST) and the “large C suture” technique, aim to reduce these complications by avoiding circular stapling [1]. Research also explores the impact of stapling height and compression time on outcomes, with longer compression times showing a trend towards fewer complications [1].

• **Hemorrhoidal Artery Ligation (HAL):** HAL works by blocking the hemorrhoidal blood supply, leading to tissue fibrosis and reduced swelling. Studies have shown HAL to be effective, even without Doppler guidance, in reducing postoperative pain, analgesic use, and complications when combined with excisional procedures like MMH or SH [1].

• **Mixed Operative Treatments:** For patients with significant internal and external hemorrhoids, combining surgical techniques has shown promise. For example, combining EH and SH has been reported to improve quality of life without increasing complications [1]. Similarly, HAL combined with EH or SH has demonstrated lower postoperative pain, shorter hospital stays, and reduced recurrence rates compared to single procedures [1].

D. Energy Therapies

Energy-based therapies aim to induce necrosis and fibrosis of hemorrhoidal tissue through various energy delivery modalities.

• **Hemorrhoid Energy Therapy (HET):** HET systems, such as bipolar devices, generate less heat than older methods like IRC, potentially reducing collateral tissue damage. Clinical results for HET have shown reduced pain and symptoms in Grade I-II patients [1].

• **Radiofrequency Ablation (RFA):** RFA, including the Rafaelo technique, uses radio waves to induce plication of anorectal mucosa. While studies report low complication and recurrence rates with high patient satisfaction, the level of evidence is considered low due to the lack of randomized controlled trials [1].

• **Laser Hemorrhoidoplasty (LH):** LH involves using a diode laser to coagulate hemorrhoidal tissue. Meta-analyses comparing LH with conventional hemorrhoidectomy have shown advantages in shorter surgery time, less intraoperative bleeding, lower postoperative pain, and quicker return to daily activities. LH also demonstrates better outcomes than RBL in terms of pain and bleeding [1]. However, most studies have limited follow-up periods (up to 1 year), and the clear advantage over conventional hemorrhoidectomy, considering similar costs to RFA, is still debated [1].

E. Interventional Treatments

Interventional treatments typically require settings beyond outpatient clinics or operating rooms.

• **Emborrhoid Technique:** This technique involves embolization of hemorrhoidal vessels via angiography. While generally reported as safe and effective, there have been rare instances of complications such as rectosigmoid ischemia, necessitating careful patient selection and awareness of potential risks [1].

• **Endoscopic Treatments:** Flexible endoscopy offers enhanced flexibility and imaging for more precise interventional procedures. Endoscopic RBL, sclerotherapy, and HET have been reported, but studies have not consistently demonstrated practical superiority over existing traditional methods [1].

III. Anal Fistula Treatments: A Clinical Review

Anal fistula treatment presents a significant challenge due to the risk of recurrence and potential impact on anal continence. The primary goal is to eradicate the infected lesion, ensure adequate drainage, and promote fistula closure while preserving anal sphincter function [2].

A. Surgical Approaches (Traditional and Sphincter-Sparing)

• **Fistulotomy:** This traditional surgical approach is effective for simple anal fistulas, particularly distal cases [2].

• **Seton Techniques:** Setons are used to promote drainage and gradual healing. Cutting Setons, while effective, have been associated with high rates of postoperative anal incontinence [2]. Drainage Setons (loose Setons) aim to preserve the sphincter and reduce incontinence, and studies have explored their combination with biological agents like infliximab for improved outcomes, especially in Crohn's disease-induced perianal fistulas [2].

• **Endorectal Advancement Flap (ERAF):** ERAF is a sphincter-sparing technique that involves advancing a flap of rectal mucosa to cover the internal opening of the fistula.

• **Ligation of the Intersphincteric Fistula Tract (LIFT):** The LIFT procedure aims to identify and ligate the fistula tract in the intersphincteric space, thereby avoiding damage to the sphincter muscles.

• **Fistula Laser Closure (FiLaC):** FiLaC uses laser energy to ablate and close the fistula tract.

• **Video-Assisted Anal Fistula Treatment (VAAFT):** VAAFT is a minimally invasive technique that uses an endoscope to visualize and treat the fistula tract.

B. Emerging and Combined Therapies

Recent years have seen the development of innovative and combined therapies to improve healing rates and minimize complications.

• **Fibrin Glue:** Fibrin glue is a biological sealant used to fill and close the fistula tract.

• **Anal Fistula Plug:** Various types of plugs, including collagen plugs and mesenchymal stromal cell (MSC) coated plugs, are used to occlude the fistula tract and promote healing. Studies are ongoing to determine the safety and efficacy of MSC-coated plugs, particularly for rectovaginal fistulas [5].

• **Adipose-Derived Stem Cells (ASCs):** Stem cell treatments, particularly using ASCs, have shown promising results for anal fistulas, with higher healing rates observed in Crohn's anal fistulas compared to cryptoglandular fistulas [4].

• **Over-the-Scope Clip (OTSC):** The OTSC is a novel, minimally invasive treatment for anal fistulas, demonstrating promising healing rates, with some studies reporting over 75% success [3].

IV. Challenges and Future Directions

Despite significant advancements, several challenges persist in the clinical study and treatment of hemorrhoids and anal fistulas. There is a critical need for **standardization of protocols**, including anesthesia methods and patient positioning, to ensure accurate assessment and comparison of treatment effectiveness [1]. The **variability in definitions** of conditions, recurrences, and adherence to postoperative lifestyle modifications also complicates the interpretation of study results [1]. Furthermore, a notable **lack of cost-effectiveness research** hinders the evaluation of whether advanced technologies justify their expense for similar outcomes [1]. Future research should prioritize **multi-center prospective randomized controlled trials with large sample sizes and long-term follow-up** to validate the efficacy and safety of emerging therapies [2].

V. Conclusion

The landscape of hemorrhoid and anal fistula treatments is continuously evolving, with ongoing research leading to more refined and less invasive approaches. From modified RBL and polidocanol foam sclerotherapy for hemorrhoids to advanced sphincter-sparing techniques and stem cell therapies for anal fistulas, the focus remains on improving patient outcomes while minimizing discomfort and recurrence. However, the journey towards optimal treatment is ongoing, with a clear need for further rigorous clinical studies, standardization, and cost-effectiveness analyses. Ultimately, personalized treatment strategies, informed by the latest clinical evidence and tailored to individual patient needs, are paramount for effective management of these challenging conditions.

VI. Disclaimer

This article is for informational purposes only and does not constitute medical advice. The content provided herein is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read in this article.

VII. References

• [1] Kang, S. I. (2025). Latest Research Trends on the Management of Hemorrhoids. *Journal of the Anus, Rectum and Colon*, 9(2), 179–191. [https://pmc.ncbi.nlm.nih.gov/articles/PMC12035339/](https://pmc.ncbi.nlm.nih.gov/articles/PMC12035339/)
• [2] Ji, L., Zhang, Y., Xu, L., Wei, J., Weng, L., & Jiang, J. (2021). Advances in the Treatment of Anal Fistula: A Mini-Review of Recent Five-Year Clinical Studies. *Frontiers in Surgery*, 7, 586891. [https://pmc.ncbi.nlm.nih.gov/articles/PMC7905164/](https://pmc.ncbi.nlm.nih.gov/articles/PMC7905164/)
• [3] Eid, M. (2025). A systematic review and meta-analysis of the outcomes of over-the-scope clip for anal fistulas. *Surgery*, 177(1), 105-112. [https://www.sciencedirect.com/science/article/abs/pii/S0039606025005215](https://www.sciencedirect.com/science/article/abs/pii/S0039606025005215)
• [4] Wang, H., Jiang, H. Y., Zhang, Y. X., Jin, H. Y., & Fei, B. Y. (2023). Mesenchymal stem cells transplantation for perianal fistulas: a systematic review and meta-analysis of clinical trials. *Stem Cell Research & Therapy*, 14(1), 1-15. [https://link.springer.com/article/10.1186/s13287-023-03331-6](https://link.springer.com/article/10.1186/s13287-023-03331-6)
• [5] Lu, M. Y. (2025). Diagnosis and treatment for anal fistula: a systematic review of current clinical practice. *Frontiers in Surgery*, 12, 12263552. [https://pmc.ncbi.nlm.nih.gov/articles/PMC12263552/](https://pmc.ncbi.nlm.nih.gov/articles/PMC12263552/)

VIII. Keywords

Hemorrhoid treatments, anal fistula treatments, clinical studies, medical review, proctology, minimally invasive procedures, surgical techniques, non-surgical treatments, medical device, patient care, healthcare professionals, SEO, medical advice disclaimer.

IX. Meta Description

Explore a comprehensive review of clinical studies on hemorrhoid and fistula treatments, covering conservative, office-based, operative, energy, and interventional approaches. Understand the latest advancements, efficacy, and challenges in proctology for both patients and healthcare professionals. This article is for informational purposes only and not medical advice.