Parameatal Foreskin Flap Research Articles

New Modification of Koyanagi Technique Using Dartos Muscle Flap in Management of Proximal Hypospadias

Background: One stage urethroplasty through parameatal foreskin flap (OUPF) available for all types of hypospadias was first described by Tomohiko Koyanagi (1983). High complication rates were reported. Objective: To evaluate the outcome of Koyanagi technique modification using dartos muscle as a 2nd layer because it has a high vascularity, very thin, easily elevated, and leaves no complications. Patient and methods: This study was conducted in the Plastic Surgery Department at Menoufia University, during the period of April 2017 to April 2019. Thirty cases for proximal hypospadias were included during this study. After chordee release, urethra was constructed using Koyanagi technique and adding scrotal dartos muscle flap as a 2nd layer. Results: Patient's age ranged from 1 to 4 years with mean age of 2.83 ± 1.17. All of the 30 cases were with proximal hypospadias and had severe chordee. Early complications were detected as bleeding in 2 patients (6.6%). One patient (3.3%) reported for retention due to obstruction of the inserted catheter. Another case (3.3%) showed wound infection. The reported late complications were fistula in 6 patients (20%), meatal recession in 5 patients (16.6%), meatal stenosis in 3 patients (10%), and diverticulum in one patient (3.3%). Conclusion: The modified Koyanagi one stage repair of proximal hypospadias is an innovative technique and realize many criteria for expected effective operating results. The use of dartos muscle flap as a cover for the urethroplasty improves the results and minimize complications.

Onlay urethroplasty with unilatreral parameatal penopreputial flap

Background/purpose: One-stage urethroplasty with bilateral parameatal foreskin flap was first described by Tomohiko Koyanagi for cases of severe hypospadias. He also introduced the onlay urethroplasty with unilateral parameatal foreskin flap for distal hypospadias. Emir and colleagues in 2000 devised a modification of the bilateral Koyanagi repair of severe hypospadias. We in turn modified the (unilateral) Koyanagi technique for the repair of hypospadias without chordee. The aim of this study is to analyze the results of the Mansoura modification of the (unilateral) Koyanagi technique as a one-stage repair of hypospadias without chordee. Patients and methods: During the period from March 2013 to March 2015, 30 patients underwent treatment of hypospadias without chordee using the modified onlay urethroplasty with unilatreral parameatal penopreputial flap (modified unilateral Koyanagi technique). Results: The patients’ age at the time of surgery ranged from 6 to 30 months. Sixteen cases had distal penile meatus, 10 had mid-penile meatus; and four had proximal penile meatus. The follow-up ranged from 3 months to 1 year. Primary success occurred in 28 (93%) cases with accepted cosmetic appearance. Complications occurred in two (7%) cases, in the form of urethrocutaneous fistula. There was no incidence of meatal stenosis nor recession, urethral stricture or flap necrosis. Conclusion: The Mansoura modification of the onlay urethroplasty with unilatreral parameatal penopreputial flap (unilateral Koyanagi) is applicable for all forms of hypospadias without chordee showing acceptable results. Keywords: hypospadias, modified Koyanagi, one-stage urethroplasty, onlay urethroplasty with parameatal penopreputial flap, original Koyanagi

Onlay urethroplaty with one-lateral parameatal foreskin flap repair for distal hypospadias

Objective To compare two operative approaches for treatment of distal hypospadias. Methods One hundred and seven patients were recruited into the study. Group1(n=51) underwent OUPF and group2(n= 56) underwent TIPU repair. The results were analyzed with Chi-square and two Sided test. Results Operative times for OUPF and TIPU repair were (103±29) min and (92±21)min respectively (P>0.05). Fistula occurred rates were 7.8% (4/51)and 14.2% (8/56) (P>0.05). Satisfied rates for the appearance of the penis post-operation were 84.8% (39/46)and 87.8%(36/41) respectively (P>0.05). 87 patients were followed up. With mean follow-ups of 15 months (range 6 to 47) , the overall complication rates were 15.7% (8/51) and 32.1 % (18/56)(P<0. 05) for OUPF and TIPU repair. Only 4 of 51 patients (7.8%) undergoing OUPF underwent re-operations, compared to 15 of 56 patients (26.8%) undergoing TIPU repair (P<0.001). A plateau uroflow curve (vs normal bell curve)was observed in 33.3% (13/39)and 67.6(25/37) ,respectively(P<0. 001). The average flow rate was 9. 4 ml per second (range 3. 2 to 17. 1) in patients undergoing OUPF repair, compared to 6. 8 ml per second (3. 3 to 15, P<0. 05) for those undergoing TIPU repair. Mean peak flow rates were12.2 ml per second (range 3.9 to 22.9) and 8. 3 mi per second (range 3.7 to 18. 1, P<0.01) for OUPF and TIPU procedures. Conclusion OUPF is superior to TIPU in the surgical treatment of distal hypospadias. Key words: Hypospadias; Surgical procedures, elective

Modified Koyanagi Technique in Management of Proximal Hypospadias

Background/Purpose: One stage urethroplasty with parameatal foreskin flap (OUPF) applicable to all types of hypospadias was first described by Tomohiko Koyanagi, however high complication rates were reported .The aim of this study is to analyze the results of a modification of the Koyanagi technique as a one-stage repair of proximal hypospadias. Patients and Methods: During the period of from March 2008 to March 2009, 30 patients underwent treatment of proximal hypospadias using the modified Koyanagi technique. Patient age at the time of surgery ranged from 6 to 24 months. In all cases, the urethral opening was at or just proximal to the penoscrotal junction. Follow up ranged from 3 months to 1 year. Results: Primary success occurred in 27 cases (90%) with accepted cosmetic appearance. Complications occurred in 3 cases (10%). Urethrocutaneous fistula occurred in 2 cases (6.7%). Meatal recession occurred in 1 case (3.3%). There was no incidence of meatal stenosis, urethral stricture, residual chordee or complete flap necrosis.

近位型尿道下裂に対する Yoke 法の検討

PROPOSED: Various techniques have so far been reported for the repair of hypospadias, however, a one-stage procedure for the repair of severe proximal hypospadias still remains difficult to perform. We recently have begun to use the Yoke hypospadias repair technique for the treatment of severe proximal hypospadias. As the chief surgeon, I performed a one-stage hypospadias repair on 40 proximal hypospadiac patients with severe fibrous chordee between July 1992 and December 2004. During the early period, eleven patients underwent urethroplasty by the Transverse Preputial Island Flap techinique (TPIF). Next, 10 patients underwent One-stage Urethroplasty with Parameatal Foreskin flap technique (OUPF IV). Finally, the most recent 19 had their hypospadias repaired by the Yoke technique. With the TPIF technique in the early periods, only 6 out of 11 patients underwent a successful repair (54.5%). With the OUPF IV technique, the success rate was only 60.0% (6 out of 10 cases). In contrast, 17 out of 19 cases treated by the Yoke technique in the most recent period had a successful repair, although proximal urethrocutaneous fistula and urethral stenosis occurred in one patient, respectively. A relatively high success rate was therefore obtained using the Yoke technique for the repair of severe proximal hypospadias. The Yoke techniques for the repair of hypospadias is therefore considered to be a safe and effective technique for the repair of proximal hypospadias because of the continuous skin flap of the ventral urethral plate and the prepuce with a blood supply from the circumferential vascular pedicle. We consider this technique to be very useful for the treatment of severe proximal hypospadias.

Clinical results of one-stage urethroplasty with parameatal foreskin flap for hypospadias.

We investigated the usefulness of one-stage urethroplasty by the parameatal foreskin flap method (OUPF procedure), which is useful for repairing all types of hypospadias. Between June 1992 and March 2001, the OUPF procedure was performed on 18 patients with hypospadias: 10 patients with distal and 8 with proximal hypospadias. The follow-up periods ranged from 33-75 months, with an average of 52 months. The duration of surgery, the catheter indwelling period, and the postoperative complications of each patient were analyzed. The median age of the patients at the time of surgery was 3 years and 8 months. The length of surgery for OUPF II ranged from 150-230 min (average 186 min), and from 190-365 min (average 267 min) for OUPF IV. Postoperative complications were confirmed in 3 of the 18 patients (16.6%). Two patients had fistulas, and one had a meatal regression. The fistulas were successfully closed by the simple multilayered closure method. After adopting DuoDerm dressings instead of elastic bandages for protection of the wound, no fistulization occurred. DuoDerm dressings are useful in the healing of wounds without complications. To date, the longest follow-up period has been 75 months, and during that time there have been no late complications such as urethral stenosis or penile curvature. OUPF is a useful method in the treatment of hypospadias with a low incidence of early and late complications.

SEVERE HYPOSPADIAS REPAIR WITH MEATAL BASED PARACORONAL SKIN FLAP: THE MODIFIED KOYANAGI REPAIR

Various techniques have been reported to repair severe hypospadias. The Koyanagi repair uses a meatal based foreskin flap. We modified this procedure and reviewed the outcome of the repair of severe hypospadias. The modified Koyanagi repair was performed in 151 children 7 months to 15 years old (mean age 3 years) with severe hypospadias. The records of these patients were reviewed. In all cases the meatus was at or proximal to the penoscrotal junction. Followup was 6 months to 16 years (mean 6 years). Flap design is the same as in the Koyanagi repair, although our modified technique requires removal of the subcutaneous tissue of the distal portion of the flap, which acts as a full-thickness free skin graft. A fistula developed in 19 patients (12.6%), meatal stenosis in 3 (2%) required meatoplasty and infection in 2 (1.3%) resulted in a regressed meatal position. Good cosmetic results were achieved in all except the latter 2 cases. Our modified Koyanagi repair affords an excellent cosmetic appearance. The complication rate is relatively low and compares favorably with that of other techniques.

One-Stage Repair of Hypospadias: Is There No Simple Method Universally Applicable to All Types of Hypospadias?

A simple method of hypospadias repair is described. The operative technique consists of 7 steps, including 1) outlining the skin incision and dartos mobilization; 2) artificial erection, harvesting parameatal foreskin flap and release of chordee as needed; 3) glans splitting and creation of glanular wings; 4) 1-stage urethroplasty with parameatal foreskin flap; 5) meatal glanuloplasty; 6) creation of Byars’ flaps of the skin, and 7) skin closure. Central to the technique is the feasibility of the choice of 1-stage urethroplasty with meatal based manta-wing flap or with parameatal based and fully extended circumferential foreskin flap even after the skin incision is made, which enables its application to all types of hypospadias. Of 120 patients the 1-stage urethroplasty was performed with meatal based manta-wing flap in 50, and with parameatal based and fully extended circumferential foreskin flap in 70. Primary success was obtained in 82% of the cases with meatal based manta-wing flap, and in 53% with parameatal based and fully extended circumferential foreskin flap. Complications requiring secondary repair occurred in 42 cases (9 with meatal based manta-wing flap, and 33 with parameatal based and fully extended circumferential foreskin flap) but repair was successful in 32. Thus, the overall success rate was 91% (96% with meatal based manta-wing flap, and 87% with parameatal based and fully extended circumferential foreskin flap). Additional repair (10 secondary, 2 tertiary and 1 quaternary) is planned in 13 cases. The technique of 1-stage urethroplasty with parameatal foreskin flap is recommended as a simple and reliable treatment for hypospadias with a reasonable success rate.

Measurement of blood flow in the parameatal foreskin flap for urethroplasty in hypospadias repair

Measurement of blood flow in the parameatal foreskin flap for urethroplasty in hypospadias repair

Measurement of blood flow in the parameatal foreskin flap for urethroplasty in hypospadias repair.

During the one-stage repair of hypospadias the blood flow of the parameatal-based foreskin flap was measured in 30 patients by using laser Doppler velocimetry. The mean blood flow in the penile foreskin was estimated to be 15 ml/min/100 g and it increased to 150-200% after the induction of anesthesia, and then decreased to 72% at the tip of the created parameatal foreskin flap. Topical application of papaverine hydrochloride restored the flow to the preincision level in half of the cases. The parameatal foreskin flap, both in the form of a manta-wing and in extended circumferential form, appears to have an enough microcirculation suitable for one-stage repair (OUPF II and OUPF IV, respectively) of hypospadias.

Onlay Urethroplasty with Parameatal Foreskin Flap for Distal Hypospadias

A new technique of onlay flap urethroplasty is described. The cosmetic and functional results of this logical extension of our one-stage urethroplasty with parameatal foreskin-flap have been good. The onlay urethroplasty with parameatal foreskin flap was recommended for the repair of distal hypospadias without chordee.

195 - One-Stage Urethroplasty with Parameatal Foreskin-Flap (OUPF) for Severe Proximal Hypospadias Associated with Bifid Scrotum

No AccessJournal of Urology1 Jun 1987One-Stage Urethroplasty with Parameatal Foreskin-Flap (OUPF) for Severe Proximal Hypospadias Associated with Bifid Scrotum Tomohiko Koyanagi, Katsuya Nonomura, Kaori Imanaka, Toshiaki Gotoh, and Kaname Ameda Tomohiko KoyanagiTomohiko Koyanagi More articles by this author , Katsuya NonomuraKatsuya Nonomura More articles by this author , Kaori ImanakaKaori Imanaka More articles by this author , Toshiaki GotohToshiaki Gotoh More articles by this author , and Kaname AmedaKaname Ameda More articles by this author View All Author Informationhttps://doi.org/10.1016/S0022-5347(17)75345-1AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail "One-Stage Urethroplasty with Parameatal Foreskin-Flap (OUPF) for Severe Proximal Hypospadias Associated with Bifid Scrotum." The Journal of Urology, 137(6), p. 152A © 1987 by The American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 137Issue 6June 1987Page: 152A Advertisement Copyright & Permissions© 1987 by The American Urological Association Education and Research, Inc.MetricsAuthor Information Tomohiko Koyanagi More articles by this author Katsuya Nonomura More articles by this author Kaori Imanaka More articles by this author Toshiaki Gotoh More articles by this author Kaname Ameda More articles by this author Expand All Advertisement PDF DownloadLoading ...