J Indian Assoc Pediatr Surg Tec Mitchell

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J Indian Assoc Pediatr Surg Tec Mitchell

  1. 1. [Downloaded free from http://www.jiaps.com on Sunday, June 14, 2009] Original Article Full text online at http://www.jiaps.com Mitchell’s technique for epispadias repair: Our preliminary experience Y. K. Sarin, V. Manchanda Department of Pediatric Surgery, Maulana Azad Medical College, New Delhi - 110 002, India Correspondence: Dr. Yogesh Kumar Sarin, Department of Pediatric Surgery, Maulana Azad Medical College, New Delhi - 110 002, India. E-mail: yksarin@hotmail.com ABSTRACT Aim: We present here experience of a single surgeon with Mitchell’s procedure for correction of epispadias. Materials and Methods: Nine boys (mean age 5½ years, range 9 months to 16 years) underwent Mitchell’s repair in Department of Pediatric Surgery over a period of 5½ (September 1999 to March 2005) for correction of epispadias. Six of these patients had come for the second stage of exstrophy-epispadias repair after primary bladder closure; the other three had incontinent penopubic epispadias. Results: The penis was cosmetically acceptable as regards to size, glans shape and peno-pubic angle in all the patients. However, there was a high incidence of penopubic fistula (44%). These patients with penopubic fistula also required postoperative urethral dilatations, at times repeated. One of the common factors to these subset patients was their younger age when Mitchell’s urethroplasty was performed. Limitations: The series is descriptive in nature, short in numbers and does not provide statistical comparison of Mitchell’s procedure with the previously done procedures. Conclusions: Mitchell’s complete penile disassembly technique for epispadias repair is more acceptable anatomical procedure that results in near-pendulous penis. However, when performed at young age, it is fraught with the complication of penopubic fistula similar to that as seen with Cantwell-Ransley’s procedure. Mitchell’s procedure creates a hypospadiac meatus initially and the meatal advancement is required as for any other distal penile/coronal hypospadias. KEY WORDS: Epispadias, exstrophy bladder, Mitchell’s repair, urethroplasty INTRODUCTION The patients were admitted a day before surgery and were given pre-operative antibiotic. All patients were operated Successful correction of epispadias has been a challenge under general anesthesia. The operative technique used for pediatric surgeons. Various modifications have been was first described by Mitchell and Bagli in 1996.[2] It advised in last century for epispadias repair in order to involves complete penile disassembly into 3 unique and improve the results in terms of fistula formation, separate parts 1) the urethral plate, 2) right corpus incontinence, cosmetically acceptable glans shape and cavernosum with hemiglans and 3) left corpus adequacy of sexual functions [Table 1]. [1] We have cavernosum with hemiglans [Figure 1]. This disassembly analyzed outcome of Mitchell’s technique of epispadias is based on paired dorsal arteries and neurovascular repair in our 9 patients. bundles to each hemiglans, the deep cavernous arteries to the corporal bodies and the spongiosum tissue MATERIALS AND METHODS supplying the proximal urethral plate. The urethral plate is tubularized and placed ventral to the corporal bodies. Nine boys (mean age 5½ years, range 9 months to 16 The corpora are now rotated to correct the dorsal chordee. years), underwent Mitchell’s repair in Department of The corpora cavernosa are sutured together with delayed Pediatric Surgery over a period of 5½ (September 1999 absorbable sutures on the dorsum. The urethra is to March 2005) for correction of epispadias. Six of these positioned in the ventral groove between the corpora patients had come for the second stage of exstrophy­ cavernosa and a hypospadiac meatus is constructed at epispadias repair after successful primary bladder corona. closure; the other three had incontinent penopubic epispadias. The dressing was opened on the 7 th post-op day and the 31 J Indian Assoc Pediatr Surg / Jan-Mar 2006 / Vol 11 / Issue 1
  2. 2. [Downloaded free from http://www.jiaps.com on Sunday, June 14, 2009] Sarin YK, et al: Mitchell’s technique for epispadias repair Table 1: Results of Mitchell’s repair in treatment of epispadias Diagnosis Age at surgery Shaft angle Glans shape Penopubic fistula Continence Voiding Epispadias 1½ y 90[o] Good No 3 hr Good stream Epispadias 8y 100 o Good No 3 hr Good stream Exstrophy 9y 90o Good No 2 hr Satisfactory Exstrophy 16 y 90[o] Good Yes 1 hr Satisfactory Exstrophy 8m 110o Good Yes 2 hr Good stream Exstrophy 2y 120o Good No 3 hr Good stream Exstrophy 10 y 100 o Good No 4 hr Good stream Exstrophy 10 m 90o Good Yes 1 hr Satisfactory Exstrophy 2½ y 90o Good Yes 1 hr Satisfactory (a) (b) (c) Figure 1: (a, b and c) Total penile disassembly into right corpora cavernosa with hemi-glans and urethral plate. Also note the reconstructed urethra is shorter than the corpora. catheter was removed on 10 th post-op day. The children who did not develop penopubic fistula were discharged the following day. The patients underwent regular follow­ up examinations and were evaluated for penile size, penile position, fistula formation and continence. One of the patients of exstrophy bladder-epispadias complex had bladder neck reconstruction along with Mitchell’s urethroplasty. He had next stage Byar’s urethroplasty for the resultant hypospadias 2½ years later. Another patient had closure of the partially dehisced exstrophy bladder concomitant with the Mitchell’s urethroplasty. Figure 2: Reconstructed penis with good size, conical shaped glans, RESULTS downwardly hanging penis and hypospadiac meatus. The penis was longer pre- and post- operatively in the who didn’t have exstrophy earlier. three patients with incontinent epispadias than in patients with exstrophy-epispadias complex. However, no Four of the six patients of exstrophy-epispadias complex statistically significant inference could be derived on such developed penopubic fistula. The fistula could be closed small number of patients. All the patients had age-related successfully in 3 patients; the fourth patient had failure acceptable penile size and conical shaped glans post­ of fistula closure, but it healed spontaneously after few operatively acceptable that was acceptable to the treating weeks. The common factor in these four patients was that surgeon and the parents. The shaft angle varied from 90o three of them had their surgery at younger age (8 months, to 120o in the flaccid state in standing position [Figure 9 months and 30 months). 2]. Again the peno-pubic angle was better for the patients J Indian Assoc Pediatr Surg / Jan-Mar 2006 / Vol 11 / Issue 1 32
  3. 3. [Downloaded free from http://www.jiaps.com on Sunday, June 14, 2009] Sarin YK, et al: Mitchell’s technique for epispadias repair Four patients required urethral dilatation post-operatively. erection to permit proper sexual intercourse. Two had one dilatation each, while other two patients required multiple admissions and urethral dilatations In all the 9 patients in our series, the cosmetic appearance under general anesthesia. Incidentally, three of these four was good. Six patients had downwardly hanging penis and patients had had penopubic fistula after the initial three had straight penis when standing. The results of Mitchell’s urethroplasty. The other identifiable common their adequate sexual activity are pending. None of the factor in these four patients was that three of them had patients had the problem of dorsal chordee, a situation their surgery at younger age (8 months, 9 months and 2 so commonly associated with the Cantwell-Ransley’s years). procedure. Only one of these 9 patients has undergone next stage The penopubic fistula continues to be a problem with urethroplasty to bring the neo-meatus at the tip of penis. Mitchell’s urethroplasty, an incidence of 44% was noted Rest of the 8 patients micturate through a hypospadiac in our series. This is very similar to our previous experience meatus in good stream and could hold urine for 1-4 hours. with Cantwell-Ransley’s procedure. One available While a coronal hypospadias is acceptable to 5 older remedial action could be to add tunica vaginalis pedicled patients and they don’t want any further urethroplasty, wrap primarily along with Mitchell’s repair.[7] We also three of the younger children with mid-penile hypospadiac believe that ventral mobilization of skin flaps from the meatus are waiting for next-stage urethroplasty. area of peno-scrotal disassociation in exstrophy patients as suggested by Kulkarni et al from Mumbai would not DISCUSSION only obviate the problem of penopubic fistula, but help to increase the penopubic angle further.[8] Cantwell described the first epispadias repair in 1895.[3] Many modifications have been described since then to We have found that the urethral plate is always shorter improve the results. Young’s reconstruction, most widely than the corpora cavernosa; the attempt to place the used in the 20th century, was complicated by fistula rates neomeatus at the tip of the glans will produce a bowstring over 21% at best centers and an upwardly angulated penis effect and accentuate the dorsal chordee. All our patients in 39% of the patients. [4,5] Ransley’s modification had a hypospadiac meatus at the coronal level that improved the fistula rate but problem of residual dorsal required correction in the next stage to create an chordee and short penile length persisted when the orthotopic meatus at the tip of the glans. urethral plate is short.[1,6] There are few modifications that have been described Mitchell and Bagli described a technique for complete since Mitchell’s initial description of the procedure. These dorsal chordee correction, penile shaft lengthening, include leaving a small tissue bridge to avoid shortening repositioning of the urethra on the ventral aspect of the of the urethral plate and better blood supply. Another penis and to produce conical glans.[2] The technique is variant described dissection of each corporal body from based on the anatomical fact that the vascular supply of the glans cap and neurovascular bundle to achieve the urethral plate with corpus spongiosum is maintained complete mobility. This procedure enables complete by bulbourethral arteries and the corpora and the curvature repair.[9] Garat et al have described the Gil­ hemiglans have adequate independent blood supply from vernet trigonoplasty as a first step of a bladder exstrophy the deep and dorsal arteries of the penis. The complete repair followed by the Mitchell’s repair. [10] This penile disassembly corrects the dorsal chordee, the medial modification is supposed to obviate the need of a rotation of the corpora corrects the lateral rotation, the secondary procedure for vesico-ureteric reflux that is urethral neomeatus is constructed on the ventral aspect commonly described after Mitchell’s repair. and the glansplasty results in conical-shaped glans. REFERENCES Complete penile disassembly technique provided increase in penile shaft length in all patients with cosmetically 1. Narsimhan KL, Mohanty SK, Singh N, Samujh R, Rao KLN, Mitra SK. Epispadias repair using the Mitchell technique. J Pediatr Surg acceptable conical glans shape. Increase in penile length 1999;34:461-3. can be achieved by making the best use of corpora distal 2. Mitchell ME, Bagli DJ. Complete penile disassembly for epispadias to their attachment to the inferior pubic rami. Adequate repair:the Mitchell technique. J Urol 1996;155:303-4. 3. Cantwell FV. Operative treatment of epispadias by transplantation lengthening of penile shaft with correction of chordee of urethra. Ann Surg 1895;22:689-93. and rotational deformities is required to produce a 4. Young HH. An operation for the cure of incontinence associated downwardly angulated penis on standing and straight with epispadias. J Urol 1922;7:1-8. 33 J Indian Assoc Pediatr Surg / Jan-Mar 2006 / Vol 11 / Issue 1
  4. 4. [Downloaded free from http://www.jiaps.com on Sunday, June 14, 2009] Sarin YK, et al: Mitchell’s technique for epispadias repair 5. Lepor H, Shapiro E, Jeffs RD. Urethral reconstruction in boys with 8. Kulkarni B, Chaudhary N, Yadav S, Oak SN. A new technique for classical bladder exstrophy. J Urol 1984;131:512-5. repair of exstrophy-epispadias complex. Pediatr Surg Int 2002;18:559­ 6. Ransley PG, Duffy PG. Bladder exstrophy closure and epispadias 62. repair. In: Spitz L, Coran AG (editors). Rob & Smith Operative 9. Perovic SA, Vukadinovic V, Djordjevic ML, Djakovic NG. Penile Surgery (Pediatric Surgery). Chapman & Hall: London; 1995. p. 745- disassembly technique for epispadias repair: variants of technique. J 59. Urol 1999;162:1181-4. 7. Chatterjee US, Basak D, Chakraborty, Mandal T, Bhaumik K. Tunica 10. Garat JM, Pena DL, Caffaratti J, Villavicencio H. Prevention of vaginalis pedicled wrap (TVPW) in re-do hypospadias surgery. J vesicoureteric reflux at the time of complete primary repair of Indian Assoc Pediatr Surg 2004;9:179-83. exstrophy-epispadias complex. Internat Urol Nephrol 2004;36:211­ 2. J Indian Assoc Pediatr Surg / Jan-Mar 2006 / Vol 11 / Issue 1 34

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