|Year : 2018 | Volume
| Issue : 2 | Page : 237-243
Ligation of intersphincteric fistula tract for high trans-sphincteric fistula-in-ano: our experience
Mohammedy M El-Said1, Ahmed Shaaban2, Mohsen A Abdelmohsen3
1 Department of Surgery, Damanhur National Institute Hospital, Damanhur, Egypt
2 Department of Surgery, Medical Research Institute Hospital, Egypt
3 Department of Radiodiagnosis and Intervention, Faculty of Medicine, Alexandria University, Alexandria, Egypt
|Date of Submission||29-Jan-2018|
|Date of Acceptance||13-Mar-2018|
|Date of Web Publication||30-May-2018|
Department of Surgery, Medical Research Institute Hospital, Alexandria University, 165 El-Horreya Avenue, El-Hadra, Alexandria 21561
Source of Support: None, Conflict of Interest: None
Background Fistula is a common perianal pathology. Management of high fistula is challenging, and up till now, there is no sole gold standard surgery for its management. The ideal treatment must eradicate local infection without endangering anal continence. This encouraged us to conduct this study to evaluate the use of one of the newly developed sphincter-saving procedures, which is ligation of intersphincteric fistula (LIFT) technique for management of high trans-sphincteric fistula, regarding fistula healing, anal continence, and recurrence.
Patients and methods This study was a prospective study. From January 2016 to January 2017, 26 consecutive patients underwent LIFT procedure for high trans-sphincteric fistulae-in-ano in Damanhur National Institute Hospital and Medical Research Institute Hospital, Alexandria University.
Results Success rate of the procedure was 80.8% after a follow-up period of 8 months. No change of continence had occurred in any of patients in this study. Relapse of fistula occurred in 11.5% of patients and nonhealing occurred in 7.7% of patients. The time of fistula healing was 20.0–45.0 days with a median of 26.5 days.
Conclusion LIFT procedure is a safe procedure for management of high trans-sphincteric fistula with promising short-term results and zero incontinence rate.
Keywords: fecal incontinence, fistula-in-ano, high trans-sphincteric, ligation of intersphincteric fistula, sphincter-saving procedure
|How to cite this article:|
El-Said MM, Shaaban A, Abdelmohsen MA. Ligation of intersphincteric fistula tract for high trans-sphincteric fistula-in-ano: our experience. Egypt J Surg 2018;37:237-43
|How to cite this URL:|
El-Said MM, Shaaban A, Abdelmohsen MA. Ligation of intersphincteric fistula tract for high trans-sphincteric fistula-in-ano: our experience. Egypt J Surg [serial online] 2018 [cited 2018 Aug 21];37:237-43. Available from: http://www.ejs.eg.net/text.asp?2018/37/2/237/233586
| Introduction|| |
Perianal fistulae are the chronic stages of infections in the anorectal regions and are symptomatized by persistent discharge of pus or recurrent attacks of perianal pain associated with abscess formation, which is relieved by either spontaneous or incisional drainage . Fistula is a common perianal pathology that usually results from obstruction of intersphincteric anal gland ducts with subsequent pus accumulation and abscess formation. Pus is usually drained through an external opening in the perianal skin, resulting in the fistula formation . Fistula-in-ano may be associated with trauma or specific pathologies such as malignancy, inflammatory bowel disease, tuberculosis, and perianal actinomycosis ,.
Surgery is the treatment for fistulae-in-ano, aiming to achieve permanent healing without impairment of fecal continence ,,. Fistulotomy is the traditional standard surgical modality for treatment of fistula-in-ano with a high rate of cure reaching up to 90–97% ,. This high rate of cure is limited by the fact that laying out a high or complex fistulous tract may be associated with a high rate of fecal incontinence ; therefore, fistulotomy has been limited to management of simple and low trans-sphincteric fistulae ,. Complex fistulae are treated with various other surgical techniques with the hope to achieve the same cure rate of fistulotomy but without endangering continence. These techniques have a variable degree of success rate and include endoanal (mucosal) advancement flap (MAF), seton use either cutting or draining, debridement, and fibrin glue injection or plug insertion. Recurrence after these procedures is variable reaching up to 63% for MAF, 84% for fibrin glue, and 66% for the plug ,,. Incontinence rate following MAF and cutting seton may reach up to 35 and 38%, respectively .
Novel sphincter-saving procedures such as ligation of intersphincteric fistula tract (LIFT), video-assisted anal fistula treatment, and fistula-tract laser closure have been recently developed for the treatment of fistula-in-ano, with promising early results and minimal risk of incontinence ,,,. Video-assisted anal fistula treatment and fistula-tract laser closure need special instruments and laser fiber which are not available in our institutes. This encouraged us to conduct this study to report our experience in the use of LIFT for treatment of high trans-sphincteric fistulae in terms of fistula healing, intact sphincteric function, and recurrence.
| Patients and methods|| |
This study was a prospective experimental study. From January 2016 to January 2017, 26 consecutive patients underwent LIFT procedure for high trans-sphincteric fistulae-in-ano in Damanhur National Institute Hospital and Medical Research Institute Hospital, Alexandria University.
Sample size and study power
On the basis of literature review for success rate of LIFT technique relative to traditional methods considering mainly incontinence rate, a sample of 25 patients will provide a study power of 90% to estimate a clinically acceptable effect size of 0.25 (moderate) with 95% confidence level of 0.1–0.30. The effect size was based on difference at incontinence rate between the LIFT method and what is known about traditional methods of 30% on average with precision of 7 and 10% more sample units to avoid attrition effect .
All patients underwent full history taking with emphasis on their complaints, history of previous perianal abscesses whether relieved spontaneously or by incisional drainage, history of previous surgery for their fistulae, and presence of any type of anal incontinence. Preoperative digital rectal examination, office anoscopy, and endoanal ultrasonography (EUS) were done for each patient in this study. EUS helped in precise localization of the site of the internal opening and determined the volume of the anal sphincter passing beneath the fistulous tract. Trans-sphincteric fistula was considered high if it passed over more than one-third of the external anal sphincter ,. Exclusion criteria included recurrent fistulae, presence of preoperative fecal incontinence, age younger than 18 or older than 75 years, anorectal abscesses or active inflammation, association of the fistula with anorectal malignancy, tuberculosis, HIV, local irradiation, and poorly controlled diabetics. Every patient in this study signed an informed consent, which was approved by ethics committee in our institutes after detailed explanation of the procedure and possible complications.
An enema was performed for each patient in this study at least 12 h before surgery. All procedures were done under spinal anesthesia. All procedures were done in the lithotomy position. Digital rectal examination and anoscopy were done to exclude any possible associated or underlying pathology. Identification of the internal opening was done by gentle probing of the tract if possible and if not injection of hydrogen peroxide (H2O2) was done. Forceful passage of a probe was avoided so as to avoid false passage. A curvilinear incision of 2–3 cm in the intersphincteric space was done opposite to the internal opening. Gentle dissection between internal and external sphincters was done using scissors and bipolar diathermy to identify the fistulous tract. Dissection was facilitated by the use of long narrow blade retractors. A small right-angled clamp hooked the tract after its identification. Double transfixion of the fistulous tract with vicryl 3/0 or 2/0 (Ethicon, Somerville, New Jersey, USA) (according to the size of the tract) was done very close to the internal opening after removal of the probe. Division of the tract distal to the transfixion knots was done. Partial coring out of the external sphincter portion of the divided tract was done followed by ligation or transfixion of the remaining end of the divided tract as far as possible with excision of the intersphincteric portion of the tract and possible infected anal glands. H2O2 was injected through the external opening to confirm proper division of the tract. The excised tract was sent for histopathological examination. An ellipse was done around the external opening with aggressive curettage of the external portion of the tract. The internal and external sphincters were reapproximated with vicryl 3/0 (Ethicon). The intersphincteric wound was closed with interrupted loose vicyl 3/0 (Ethicon) sutures and the external opening was left open to heal by secondary intention.
Operative and postoperative course
The following intraoperative data were recorded for each patient: identification of the internal opening (probing or H2O2 injection), correlation of preoperative data of EUS with intraoperative findings, and operative time. Postoperatively, all patients were followed up for assessment of fistula healing, continence, and recurrence. Complete fistula healing was considered when complete closure of intersphincteric wound and external opening occurred with absence of purulent discharge or air leak from both wounds. Continence was described according to clinical staging as: category A: full continence, category B: flatus incontinence but continence of solid and usually fluidly stool, category C: incontinence of fluidly stool and flatus but not of solid stool (intermittent fecal leakage), and category D: complete incontinence (persistent fecal leakage) . Postoperatively, all patients received normal oral diet without any restrictions. Oral ciprofloxacin and metronidazole were given for 2 weeks after the operation. Patients were informed to clean their wound thoroughly with tap water. All patients were discharged on the first postoperative day after assessment of their wounds for possibility of hematomas.
Follow-up was done at the outpatient clinic weekly until complete fistula healing occurred then every 2 months for 8 months. If complete closure of both external opening and intersphincteric wounds did not occur after 10 weeks, this was considered as nonhealing of the fistulous tract. Reopening of the fistula after apparent complete healing, appearance of new external opening, and recurrence of symptoms after complete resolution at any time during the period of follow-up was considered as recurrence of the fistulous tract. None healing and recurrence of the fistulous tract were considered as failure of the procedure. We did not lose any patient during follow-up.
Data were fed to the computer and analyzed using IBM SPSS software package, version 20.0 (SPSS, Inc., Chicago, IL, USA). Qualitative data were described using number and percentage, whereas quantitative data were described using minimum–maximum, mean±SD.
| Results|| |
Preoperative and operative data of the studied population were shown in [Table 1] and [Table 2], respectively. Postoperative hematomas occurred in two (7.7%) patients which were mild and managed conservatively. Success rate of the procedure was 80.8% after a follow-up period of 8 months. Postoperative incontinence rate was 0% in this study. Postoperative data of the studied population were shown in [Table 3]. [Figure 1],[Figure 2],[Figure 3],[Figure 4], show illustrations of the steps of LIFT procedure for a 39-year-old female patient with high anterior trans-sphincteric fistula.
|Figure 4 Closure of intersphincteric wound with widening and curettage of the external opening.|
Click here to view
| Discussion|| |
In this study, all procedures were performed in the lithotomy position in accordance to the study by Sileri et al. . Most of the authors including Rojanasakul et al.  who originally described the procedure have used prone Jack knife position ,,,,,,, whereas others have used both Jack knife and lithotomy positions ,,. In this study, we did not find any difficulty in performing LIFT procedures in the lithotomy position as we were used to performing all anal procedures in this position in our institutes. We thought that operative positioning of patients in various studies was a matter of surgeons’ preference.
Preoperative EUS was done routinely for all patients in this study, which was similar to several previous studies ,,,,,,. Other authors did not perform routine preoperative ultrasonography and depended only upon the intraoperative evaluation ,, and others use it selectively ,. EUS was accurate in localization of internal opening in 84.6% of patients which was close to the results of the study by Tan et al. . We thought that it was better to perform preoperative EUS if possible as it had a high accuracy and could help in precise localization of intersphincteric incision for LIFT procedure especially in a case of intraoperative nonidentification of internal opening.
We excluded patients with recurrent fistulae from this study, which was similar to some of the previous studies ,. Most of the authors included patients with recurrent fistulae in their studies ,,,. We preferred to operate upon naive patients as surgery for recurrent fistulae was expected to be more difficult, and before this study, we did not have a previous experience with the LIFT procedure in our institutes.
We did not perform a preoperative seton for all candidates of this study. Murugesan et al.  conducted a systematic review for evaluation of efficacy of the LIFT for treatment of perianal fistulae and found 13 studies that evaluated the use of seton before LIFT procedure. No significant changes were found in any of these studies regarding closure of fistulae in a case of use of preoperative seton ,,,,,,.
Success rate of LIFT procedure in this study was 80.8% after 8 months of follow-up. Variable success rates of LIFT procedures were reported by previous authors with a wide range from 40 to 90% ,,,,,,,,,,,. This wide range may be owing to the differences in inclusion and exclusion criteria of candidates from one study to the other regarding type of the treated fistula, and trials of previous fistula repair. Moreover, differences in the period of postoperative follow-up between various studies may play a role.
The median healing time in this study (26.5 days) was close to that reported by some of the previous studies ,,. Ooi et al.  and Sharma et al.  reported a median healing time of 6 weeks in their studies. Liu et al.  reported a median healing time of 8 weeks and proposed that healing time after LIFT procedure may be prolonged up to 36 weeks. They thought that patients with persistent symptoms after surgery may be managed conservatively and observed for more than 6 months before taking the decision of reoperation . This difference in healing time between different studies was expected in view of inhomogeneity of candidates of different studies.
In this study, the relapse rate was 11.5%, which was less than the reported by many of the previous studies ,,. We thought that the low relapse rate in our study was attributed to shorter follow-up (8 months) compared with these studies. Many authors described late recurrence after LIFT which extended to 7–8 months after the initial surgery ,. Liu et al.  in their study found that recurrence of fistula after LIFT procedure may occur as late as 12 months after surgery and suggested a minimum postoperative follow-up of 1 year to ensure that the patient had complete fistula healing.
In this study, all recurrences presented as intersphincteric fistulae in accordance to several previous studies ,,,,. We thought that medialization of the fistula was beneficial as all these patients were managed by fistulotomy without any compromise of anal continence.
In this study, all patients were admitted to the hospital and discharged on the first postoperative day. Many authors performed LIFT as a same-day surgery ,,,,,,. Others admitted patients to the hospitals with 1.25 days as an overall median hospital stay (range: 1–5 days) ,,,. We admitted patients overnight to the hospital for fear of postoperative bleeding as a result of intersphincteric dissection, but only two patients developed perianal hematomas, which were mild and managed conservatively. After this study, we thought that LIFT could be performed safely as a same-day surgery, and there was no need for overnight hospital admission to save the additional costs of hospitalization.
Anal continence was evaluated subjectively in the clinic similar to most of the previous studies ,,,,,. Some authors used various scores for evaluation of anal continence such as the Cleveland Clinic Florida Fecal Incontinence Score , Wexner Incontinence Score , and Fecal Incontinence Severity Index score . Sirany et al.  in their systematic review for evaluation of LIFT procedure included 12 studies of classic LIFT, including 352 patients, and described only one patient with postoperative fecal incontinence. In this study, all patients were continent after the procedure similar to most of the previous study.
In terms of high short-term success rate of LIFT procedure with 0% incontinence rate in this study together with the fact that LIFT procedure does not require any special instrument may give LIFT the chance to be an important option for treatment of high trans-sphincteric perianal fistulae in our country as ours is a developing country, and cost of the procedure is very important to us.
The principal limitations of this study were the probable small sample size and the short period of follow-up. The operating surgeons were the same who evaluated the results of the procedure, and this might produce some observational bias.
| Conclusion|| |
LIFT is a safe sphincter-saving procedure for management of high trans-sphincteric perianal fistula with reasonable short-term results without endangering anal continence. Further studies with long-term follow-up are required to evaluate LIFT and its modifications for management of various types of complex fistulae-in-ano.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
| References|| |
Whiteford MH, Kilkenny J, Hyman N, Buie WD, Cohen J, Orsay C et al.
Practical parameters for the treatment of perianal abscess and fistula-in-ano (revised). Dis Colon Rectum 2005; 48:1337–1342.
Quah HM, Tang CL, Eu KW, Chan SY, Samuel M. Meta-analysis of randomized clinical trials comparing drainage alone vs primary sphincter-cutting procedures for anorectal abscess-fistula. Int J Colorectal Dis 2006; 21:602–609.
Sheriff S, Steven DW. Idiopathic fistula-in-ano. World J Gastroenterol 2011; 17:3277–3285.
Steele SR, Kumar R, Feingold DL, Rafferty JL, Buie WD, Standards Practice Task Force of the American Society of Colon and Rectal Surgeons. Practice parameters for the management of perianal abscess and fistula-in-ano. Dis Colon Rectum 2011; 54:1465–1474.
Vergara-Fernandez O, Espino-Urbina LA. Ligation of intersphincteric fistula tract: what is the evidence in a review? World J Gastroenterol 2013; 19:6805–6813.
Rojanasakul A, Pattanaarun J, Sahakitrungruang C, Tantiphlachiva K. Total anal sphincter saving technique for fistula-in ano; the ligation of intersphincteric fistula tract. J Med Assoc Thai 2007; 90:581–586.
Hong KD, Kang S, Kalaskar S, Wexner SD. Ligation of intersphincteric fistula tract (LIFT) to treat anal fistula: systematic review and meta-analysis. Tech Coloproctol 2014; 18:685–691.
Abcarian AM, Estrada JJ, Park J, Corning C, Chaudhry V, Cintron J et al.
Ligation of intersphincteric fistula tract: early results of a pilot study. Dis Colon Rectum 2012; 55:778–782.
Rizzo J, Naig AL, Johnson EK. Anorectal abscess and fistula-in-ano: evidence-based management. Surg Clin North Am 2010; 90:45–68.
Abbas MA, Jackson CH, Haigh PI. Predictors of outcome for anal fistula surgery. Arch Surg 2011; 146:1011–1016.
Malik AI, Nelson RL. Surgical management of anal fistulae: a systematic review. Colorectal Dis 2008; 10:420–430.
Wang JY, Garcia-Aguilar J, Sternberg JA, Abel ME, Varma MG. Treatment of transsphincteric anal fistulas: are fistula plugs an acceptable alternative? Dis Colon Rectum 2009; 52:692–697.
Van Koperen PJ, Bemelman WA, Bossuyt PM, Gerhards MF, Eijsbouts QA, Van Tests WF et al.
The anal fistula plug versus the mucosal advancement flap for the treatment of anorectal fistula (PLUG trial). BMC Surg 2008; 8:11.
Soltani A, Kaiser AM. Endorectal advancement flap for cryptoglandular or Crohn’s fistula-in-ano. Dis Colon Rectum 2010; 53:486–495.
Ritchie RD, Sackier JM, Hodde JP. Incontinence rates after cutting seton treatment for anal fistula. Colorectal Dis 2009; 11:564–571.
Rojanasakul A. LIFT procedure: a simplified technique for fistula-in-ano. Tech Coloproctol 2009; 13:237–240.
Emile SH, Elfeki H, Shalaby M, Sakr A. A systematic review and meta-analysis of the efficacy and safety of video-assisted anal fistula treatment (VAAFT). Surg Endosc 2018; 32:2084–2093.
De Carvalhoa A, Filhob E, de Alcantarab R, Barretob M. FILAC − Fistula − Tract Laser Closure: a sphincter-preserving procedure for the treatment of complex anal fistulas. J Coloproctol (Rio J) 2017; 37:160–162.
Van Koperen PJ, Wind J, Bemelman WA, Slors JF. Fibrin glue and transanal rectal advancement flap for high transsphincteric perianal fistulas; is there any advantage? Int J Colorectal Dis 2008; 23:697–701.
Van Koperen PJ, Wind J, Bemelman WA, Bakx R, Reitsma JB, Slors JF. Long-term functional outcome and risk factors for recurrence after surgical treatment for low and high perianal fistulas of cryptoglandular origin. Dis Colon Rectum 2008; 51:1475–1481.
Athanasiadis S, Helmes C, Yazigi R, Kohler A. The direct closure of the internal fistula opening without advancement flap for transsphincteric fistulas-in-ano. Dis Colon Rectum 2004; 47:1174–1180.
Sileri P, Franceschilli L, Angelucci GP, D’Ugo S, Milito G, Cadeddu F et al.
Ligation of the intersphincteric fistula tract (LIFT) to treat anal fistula: early results from a prospective observational study. Tech Coloproctol 2011; 15:413–416.
Shanwani A, Nor AM, Amri N. Ligation of the intersphincteric fistula tract (LIFT): a sphincter-saving technique for fistula-in-ano. Dis Colon Rectum 2010; 53:39–42.
Bleier JI, Moloo H, Goldberg SM. Ligation of the intersphincteric fistula tract: an effective new technique for complex fistulas. Dis Colon Rectum 2010; 53:43–46.
Aboulian A, Kaji AH, Kumar RR. Early result of ligation of the intersphincteric fistula tract for fistula-in-ano. Dis Colon Rectum 2011; 54:289–292.
Ooi K, Skinner I, Croxford M, Faragher I, McLaughlin S. Managing fistula-in-ano with ligation of the intersphincteric fistula tract procedure: the Western Hospital experience. Colorectal Dis 2012; 14:599–603.
Lo OSH, Wei R, Foo DCC, Law WL. Ligation of intersphincteric fistula tract procedure for the management of cryptoglandular anal fistulas. Surg Pract 2012; 16:120–121.
Wallin UG, Mellgren AF, Madoff RD, Goldberg SM. Does ligation of the intersphincteric fistula tract raise the bar in fistula surgery? Dis Colon Rectum 2012; 55:1173–1178.
Tan KK, Tan IJ, Lim FS, Koh DC, Tsang CB. The anatomy of failures following the ligation of intersphincteric tract technique for anal fistula: a review of 93 patients over 4 years. Dis Colon Rectum 2011; 54:1368–1372.
Tan KK, Alsuwaigh R, Tan AM, Tan IJ, Liu X, Koh DC et al.
To LIFT or to flap? Which surgery to perform following seton insertion for high anal fistula? Dis Colon Rectum 2012; 55:1273–1277.
Mushaya C, Bartlett L, Schulze B, Ho YH. Ligation of intersphincteric fistula tract compared with advancement flap for complex anorectal fistulas requiring initial seton drainage. Am J Surg 2012; 204:283–289.
Giarratano G, Toscana C, Ghini C, Mazzi M, Lucarelli P, Stazi A. Ligation of the intersphincteric fistula tract (LIFT): a minimally invasive procedure for complex anal fistula. Preliminary results of a prospective study. Abstracts of the Association of Coloproctology of Great Britain and Ireland Annual Meeting. Colorectal Dis 2012; 14:28–67.
Franceschilli L, Angelucci GP, Lazzaro S. Ligation of the intersphincteric fistula tract (LIFT) to treat anal fistula: early results from a prospective observational study. Abstracts of the Association of Coloproctology of Great Britain and Ireland Annual Meeting. Colorectal Dis 2011; 13:28–62.
Alfred K, Roslani A, Chittawatanarat K, Tsang C. Short-term outcomes of the ligation of intersphincteric fistula tract (LIFT) procedure for treatment of fistula-in-ano: a single institution experience in Singapore. Poster abstracts of the American Society of Colon and Rectal Surgeons Annual Meeting. Dis Colon Rectum 2008; 51:623–812.
Koh CE, Lee PJ, Byrne CM, Wright CM, Chew EH. The lift procedure for fistula-in-ano. initial experience at a single tertiary referral center. Colorectal Dis 2011; 13:19.
Van Onkelen RS, Gosselink MP, Schouten WR. Ligation of the intersphincteric fistula tract in low transsphincteric fistula: a new technique to avoid fistulotomy. Colorectal Dis 2013; 15:587–591.
Tan K, Lim X, Tsang C. Endo anal ultrasonography versus Goodsall’s rule: experience from the ligation of intersphincteric fistulatract (LIFT)procedure. Dis Colon Rectum 2012; 55:53.
Sirikurnpiboon S, Awapittaya B, Jivapaisarnpong P. Ligation of intersphincteric fistula tract and its modification: results from treatment of complex fistula. World J Gastrointest Surg 2013; 5:123–128.
Tomiyoshi SD, Dos Santos CH. Effectiveness of the ligation of intersphincteric fistula tract (LIFT) in the treatment of anal fistula: initial results. Arq Bras Cir Dig 2014; 27:101–103.
Liu WY, Aboulian A, Kaji AH, Kumar RR. Long-term results of ligation of intersphincteric fistula tract (LIFT) for fistula-in-ano. Dis Colon Rectum 2013; 56:343–347.
Sharma A, Chinn B, Eisenstat T, Notaro J, Oliver G, Wilkins K et al.
Ligation of intershpincteric fistula tract for the treatment of fistula-in-ano: early experience of an institution. Dis Colon Rectum 2013; 56:151.
Murugesana J, Morb I, Fulhamc S, Hitosd K. Systematic review of efficacy of LIFT procedure in crpytoglandular fistula-in-ano. J Coloproctol (Rio J) 2014; 34:109–119.
Christoforidis D, Popeskou S, Burckhardt O, Demartines N. The LIFT procedure for anal fistula: technique and initial experience. Abstracts of the Association of Coloproctology of Great Britain and Ireland Annual Meeting. Colorectal Dis 2011; 13:28–62.
Espin E, Lozoya R, Vallribera F, Jimenez LM, Marti M, Salgado L et al.
LIFT (ligation of intersphincteric tract): long term results. Abstracts of the Association of Coloproctology of Great Britain and Ireland Annual Meeting. Colorectal Dis 2011; 13(Suppl 6):28–62.
Lehmann JP, Graf W. Efficacy of LIFT for recurrent anal fistula. Colorectal Dis 2013; 15:592–595.
Tsunoda A, Sada H, Sugimoto T, Nagata H, Kano N. Anal function after ligation of the intersphincteric fistula tract. Dis Colon Rectum 2013; 56(7):898–902.
Madbouly KM, El Shazly W, Abbas KS, Hussein AM. Ligation of intersphincteric fistula tract versus mucosal advancement flap in patients with high transsphincteric fistula-in-ano: a prospective randomized trial. Dis Colon Rectum 2014; 57:1202–1208.
Campbell ML, Abboud EC, Dolberg ME, Sanchez JE, Marcet JE, Rasheid SH. Treatment of refractory perianal fistulas with ligation of the intersphincteric fistula tract: preliminary results. Am Surg 2013; 79:723–727.
Hall JF, Bordeianou L, Hyman N, Read T, Bartus C, Schoetz D, Marcello PW. Outcomes after operations for anal fistula: results of a prospective, multicenter, regional study. Dis Colon Rectum 2014; 57:1304–1308.
Yassin NA, Hammond TM, Lunniss PJ, Phillips RK. Ligation of the intersphincteric fistula tract in the management of anal fistula. A systematic review. Colorectal Dis 2013; 15:527–535.
Dalbem C, Tomiyoshi S, dos Santos C. Assessment of LIFT (ligation of the intersphincteric fistula tract) technique in patients with perianal transsphincteric fistulas. J Coloproctol (Rio J) 2014; 34:250–253.
Bleier J, Moloo H. Current management of cryptoglandular fistula-in-ano. World J Gastroenterol 2011; 17:3286–3291.
Chen TA, Liu KY, Yeh CY. High ligation of the fistula track by lateral approach: a modified sphincter-saving technique for advanced anal fistulas. Colorectal Dis 2012; 14:627–630.
Sirany A, Nygaard R, Morken J. The ligation of the intersphincteric fistula tract procedure for anal fistula: a mixed bag of results. Dis Colon Rectum 2015; 58:6.
[Figure 1], [Figure 2], [Figure 3], [Figure 4]
[Table 1], [Table 2], [Table 3]