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Caruso S, Intelisano G, Farina M, Di Mari L, Agnello C. The function of sildenafil on female sexual pathways: a double-blind, cross-over, placebo-controlled study. Eur J Obstet Gynecol Reprod Biol 2003; 110:201-6. [PMID: 12969584 DOI: 10.1016/s0301-2115(03)00118-0] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVES To determine the changes, if any, on female sexual pathways using sildenafil (primary outcome), and to verify the safety of this drug (second outcome). STUDY DESIGN Following previous research on symptomatic women, we wanted to study the effects of sildenafil on asymptomatic women. We would like to make it clear from the outset that this study is part of an ongoing line of research and this drug, and others of its type, should be used under strict medical supervision only on symptomatic patients. A randomized double-blind cross-over, placebo-controlled study was conducted at the Family Planning Centre of the Group for Sexological Research, Department of Microbiological and Gynecological Science, School of Medicine, University of Catania, Italy. Sixty-eight healthy volunteer women aged 19-38 years, asymptomatic for sexual disorders, were enrolled. The study consisted of 4 weeks sildenafil, 2 weeks washout, and 4 weeks placebo, by two possible sequences: sildenafil 50 mg, washout, placebo; or placebo, washout, sildenafil 50 mg. Efficacy of sildenafil was assessed by the Personal Experiences Questionnaire (PEQ) based on the 5-point Likert scale. The questionnaire quantified subjective sexual aspects at baseline, during washout, after treatments, and at the follow-ups. Statistical analysis was done with the Wilcoxon's rank-sum test and Student's t-test. RESULTS 50/68 women completed the study at the first follow-up, and 38 women reached the second follow-up. Six women withdrew because of adverse events. Sildenafil improved arousal (P<0.001), orgasm (P<0.05), and enjoyment (P<0.001) with respect to placebo. Significant differences were noted during sildenafil usage with respect to the baseline for arousal (P<0.01), orgasm (P<0.001), and sexual enjoyment (P<0.001). The adverse events were transient and mild or moderate. CONCLUSIONS Our study suggests that sildenafil acts on the different sexual pathways in healthy women, improving their sexual experience. This study could help to understand the physiologic and pathophysiologic aspects of female sexuality. In comparison with current psychosexual therapies, which are long-term, compliance would be improved with use of this drug. Additional studies are required to define the use of sildenafil in a clinical setting.
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Affiliation(s)
- Salvatore Caruso
- Section of Gynecology, Department of Microbiological Science and Gynecological Science, School of Medicine, University of Catania, Ospedale S. Bambino, Catania, Italy.
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Stikkelbroeck NMML, Beerendonk CCM, Willemsen WNP, Schreuders-Bais CA, Feitz WFJ, Rieu PNMA, Hermus ARMM, Otten BJ. The long term outcome of feminizing genital surgery for congenital adrenal hyperplasia: anatomical, functional and cosmetic outcomes, psychosexual development, and satisfaction in adult female patients. J Pediatr Adolesc Gynecol 2003; 16:289-96. [PMID: 14597017 DOI: 10.1016/s1083-3188(03)00155-4] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND There are only a few reports analyzing the long term outcome of feminizing surgery in females with congenital adrenal hyperplasia (CAH). Such analysis is crucial to evaluate the treatment and to make necessary adjustments. STUDY OBJECTIVES To evaluate the adult outcome after feminizing surgery in adult females with salt wasting CAH. DESIGN Retrospective observational followup investigation. SETTING Outpatient clinic of a University Medical Center, in 2002. PARTICIPANTS Eight patients (born 1973-1983) who underwent feminizing surgery in infancy by the same procedure and the same pediatric surgeon in our center, and 19 healthy female controls (for visual analog scales). METHODS (a) Study of patients' records (n=8); (b) Systematic evaluation of the current situation (n=6): uroflowmetry, a written questionnaire to screen for psychopathology (Youth Adult Self Report, YASR), structured gynecologic examination and a structured psychosexual interview, including scoring on visual analog scales. RESULTS (a) The first surgery (age 0.1-3.7 yr) consisted of clitoris reduction and vaginoplasty (single-stage) in 7 patients and clitoris reduction only in one patient. The latter patient had vaginoplasty in puberty. In puberty, 6 of the 7 patients with an initial single-stage procedure required re-vaginoplasty. All 6 patients who participated in this systematic evaluation had undergone (re-) vaginoplasty in puberty; (b) 2 of the 6 patients experienced some urinary incontinence, and in one of them, the uroflowmetry result was abnormal. The YASR showed no psychopathology, except for 1 patient with a slightly elevated externalizing score. Gynecologic examination (n=5) revealed vaginal strictures in 3 patients (1 severe, 2 mild). The 2 patients without vaginal strictures had coitus regularly. In the interview, 2 patients called themselves bisexual, the other 4 heterosexual. None of the patients had homosexual contacts. Sexual developmental milestones (romantic interest, falling in love, kissing and petting, coitus) had been reached by all, except for 1 patient who did not have coitus yet. In the patient group, satisfaction with height, body hair, and external genitalia and sexual fantasies and interest, measured with visual analog scales, was not different compared to the control group, except for satisfaction with total body appearance, which was significantly lower in the patients. CONCLUSION Despite the poor outcome of the initial single-stage surgery in infancy and the inevitable re-operation in puberty, the adult outcome in our study population seems more positive than the findings in the few previous reports, especially with respect to sexual development and activity.
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Affiliation(s)
- Nike M M L Stikkelbroeck
- Departments of Pediatric Endocrinology, University Medical Center Nijmegen, Nijmegen, The Netherlands
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103
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Baskin LS. Anatomical studies of the fetal genitalia: surgical reconstructive implications. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2003; 511:239-49. [PMID: 12575765 DOI: 10.1007/978-1-4615-0621-8_14] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
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Minto CL, Liao LM, Woodhouse CRJ, Ransley PG, Creighton SM. The effect of clitoral surgery on sexual outcome in individuals who have intersex conditions with ambiguous genitalia: a cross-sectional study. Lancet 2003; 361:1252-7. [PMID: 12699952 DOI: 10.1016/s0140-6736(03)12980-7] [Citation(s) in RCA: 154] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND The effects on sexual function of surgical removal of parts of the clitoris are unknown. For infants with intersex conditions and ambiguous genitalia being raised female, this surgery is often undertaken in early childhood. Our aim was to assess the effects of surgery on sexual outcome in this population. METHOD We did a cross-sectional study to which we recruited 39 adults who had intersex conditions with ambiguous genitalia who were living as female from clinical (n=15) and peer-support (n=24) settings. We obtained data by use of a postal questionnaire, incorporating a validated sexual function assessment inventory. We also obtained hospital notes of 36 respondents who did not want to remain anonymous, and did genital examinations of 19 women. We assessed sexual problems in relation to surgical history and compared the results for our population to those of a healthy control group. FINDINGS Of the 39 individuals enrolled, 28 had been sexually active and all had sexual difficulties. The 18 women who had undergone clitoral surgery had higher rates of non-sensuality (78%) and of inability to achieve orgasm (39%) than did the ten who had not had surgery (20% [p=0.002] and 0% [p=0.03], respectively). INTERPRETATION Sexual function could be compromised by clitoral surgery. Debate on the ethics of the use of this surgery in children should be promoted and further multicentre research is needed to ensure representative samples and comprehensive outcome assessment. Meanwhile, parents and patients who consent to clitoral surgery should be fully informed of the potential risks to sexual function.
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Affiliation(s)
- Catherine L Minto
- Elizabeth Garrett Anderson Hospital, Department of Obstetrics and Gynaecology, University College London Hospitals NHS Trust, London, UK
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106
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Abstract
Penile curvature is a spectrum of disease affecting boys with and without hypospadias. The etiology of chordee includes skin tethering, fibrotic bucks or dartos fascia, corporeal body disproportion and rarely a fibrotic urethra. Several surgical techniques (plication, excision, and graft insertion) are currently employed to repair penile curvature. Recent neuroanatomical studies of the developing fetal penis have shown that the dorsal nerve branches from the 11 and 1 o'clock positions to the 5 and 7 o'clock positions, being absent in the midline. Since the neuroanatomy is similar in both the hypospadiac and normal penis, we now recommend performing penile straightening in both hypospadiac and non hypospadiac patients with significant curvature by the placement of plication sutures at the 12 o'clock position. Placement of dorsal midline plication sutures corrects curvature without risk to the underlying nerve structures.
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Affiliation(s)
- Gerald Mingin
- Department of Pediatric Urology, University of California, San Francisco, UCSF Children's Medical Center, 533 Parnassus Avenue, Building U575, San Francisco, CA 94143, USA
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107
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Sterling KM, Vogelzang RL, Chrisman HB, Worthington-Kirsch RL, Machan LS, Goodwin SC, Andrews RT, Hovsepian DM, Smith SJ, Bonn J. V. Uterine fibroid embolization: management of complications. Tech Vasc Interv Radiol 2002; 5:56-66. [PMID: 12098108 DOI: 10.1053/tvir.2002.124728] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Fortunately, the number of complications reported after uterine fibroid embolization (UFE) is extremely low. Angiographic mishap or drug reaction are probably more common than purely UFE-related complications. However, the possibility of infection or necrosis of the uterus, with their significant attendant morbidity, is a sobering reminder that embolotherapy can have a powerful impact on the target organ(s). Knowledge of the expected time course for symptom resolution and the often confusing imaging findings shortly after UFE are critical for avoiding unnecessary delay in surgical intervention or, perhaps more important, an inappropriate rush to surgery when antibiotics alone will suffice. Other complications include alteration of uterine physiology, which may disrupt sexual function, and menstrual irregularity and even premature menopause.
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Affiliation(s)
- Keith M Sterling
- Vascular and Interventional Section, Mallinckrodt Institute of Radiology, 510 S Kingshighway Boulevard, St. Louis, MO 63110, USA
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108
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Abstract
PURPOSE The clitoris has several histomorphological and functional similarities to the penis. In this study we evaluated spontaneous and evoked electromyography activity in the clitoris. MATERIALS AND METHODS We evaluated 11 healthy female volunteers with clitoral electromyography using a concentric needle electrode placed intracorporeally. The hand, foot and genital sympathetic skin responses, and spontaneous electrodermal activity were simultaneously recorded with silver surface electrodes. Another concentric needle electrode was placed subdermally on the mons pubis to differentiate clitoral activity from possible artifact. After recording spontaneous electromyography and electrodermal activity the left median nerve was stimulated to record evoked clitoral activity, and the sympathetic skin response in the hand, foot and genital regions. RESULTS There was spontaneous electromyography activity in the corpus clitoris. All dermal sites, including the hand, foot and genital regions, showed spontaneous electrodermal activity. No spontaneous activity was recorded from the subdermal needle electrode. Distraction of attention and coughing increased the amplitude and frequency of spontaneous clitoral electromyography and electrodermal activity at all sites. After stimulating the left median nerve all sites except that of the subdermal needle electrode showed evoked activity. CONCLUSIONS The demonstrated evoked and spontaneous clitoral electromyography activity seems to indicate a sympathetic tonus of the corpus clitoris, as recorded from the corpus cavernosum of the penis in human males. Clitoral electromyography may be a useful objective assessment tool for evaluating female sexual dysfunction as well as genital autonomic innervation.
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Affiliation(s)
- Ugur Yilmaz
- Departments of Urology and Neurology, Inonu University Medical Faculty, Turgut Ozal Medical Center, Malatya, Turkey
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AKMAN YAVUZ, LIU WENHUI, LI YINGW, BASKIN LAURENCES. PENILE ANATOMY UNDER THE PUBIC ARCH: RECONSTRUCTIVE IMPLICATIONS. J Urol 2001. [DOI: 10.1016/s0022-5347(05)66131-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- YAVUZ AKMAN
- From the Departments of Urology and Pediatrics, University of California School of Medicine, San Francisco, California
| | - WENHUI LIU
- From the Departments of Urology and Pediatrics, University of California School of Medicine, San Francisco, California
| | - YING W.U. LI
- From the Departments of Urology and Pediatrics, University of California School of Medicine, San Francisco, California
| | - LAURENCE S. BASKIN
- From the Departments of Urology and Pediatrics, University of California School of Medicine, San Francisco, California
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111
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Abstract
PURPOSE We retrospectively evaluated the results of a modified technique for 1-stage feminizing genitoplasty in children with congenital adrenal hyperplasia (CAH) and other rare intersex conditions. MATERIALS AND METHODS Between 1991 and 1998, 47 infants and 2 adolescents underwent 1-stage feminizing genitoplasty at our hospital. Of the patients 44 had CAH, 2 had the partial androgen insensitivity syndrome and 3 were true hermaphrodites. In 3 patients we used the Passerini-Glazel technique, while in 46 our technique of feminizing genitoplasty was used, which consists of maximal mobilization of the urogenital sinus en bloc including the vagina and urethra via the perineal approach. Two lateral plates built from dorsal split phallic and preputial skin together with the dorsal split urogenital sinus are used to construct the vaginal introitus and labia minora, and the scrotal folds are used to construct the labia majora. Reduction clitoroplasty is done according to the technique of Kogan et al. Mean age plus or minus standard deviation was 0.9 +/- 0.3 years of the patients with CAH and 13 +/- 2.3 of the remainder. Preoperative information, including status of the internal genitalia, anatomical length of the vagina site of communication between the vagina and urogenital sinus, in relation to the pelvic floor, was obtained by transabdominal pelvic ultrasound. RESULTS Operating time ranged between 120 and 180 minutes, average hospitalization period was 4 to 5 days and mean followup was 4.7 +/- 2.6 years. Preoperative ultrasound provided the correct data regarding the vaginal and internal genitalia anatomy in all cases, and the exact communication site between the vagina and urogenital sinus was demonstrated in 93%. Complications consisted of intraoperative rectal injury in 1 case and mild wound infection of the buttocks area in 3. In 1 case total clitoris loss was observed. All patients who underwent modified genitoplasty have had successful cosmetic and early functional results. Two patients presented with repeat clitoromegalia due to inadequate adrenal suppression. CONCLUSIONS Our adapted technique of 1-stage feminizing genitoplasty provides good cosmetic and functional results. The functional results of this operation should be reevaluated after puberty and in adulthood.
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Affiliation(s)
- A Farkas
- Department of Urology, Shaare Zedek Medical Center, Faculty of Health Science, Ben-Gurion University, Jerusalem, Israel
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112
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Caruso S, Intelisano G, Lupo L, Agnello C. Premenopausal women affected by sexual arousal disorder treated with sildenafil: a double-blind, cross-over, placebo-controlled study. BJOG 2001; 108:623-8. [PMID: 11426898 DOI: 10.1111/j.1471-0528.2001.00143.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVE To verify whether sildenafil is effective in young premenopausal women affected by arousal disorder. DESIGN A double-blind cross-over study. SETTING Centre for Sexological Research, Department of Microbiological and Gynaecological Science, University of Catania, Italy. SAMPLE Fifty-three volunteer women aged 22-28 years affected by arousal disorders. METHODS The study consisted of three 4-week periods: sildenafil, washout, placebo, by six possible sequences. sildenafil was used at 25 mg or 50 mg. MAIN OUTCOME MEASURES Efficacy was assessed at baseline and once monthly by the Personal Experiences Questionnaire based on the 5-point Likert scale. The questionnaire quantified subjective arousal (primary endpoint), and orgasm, enjoyment, sexual frequency, and the number of sexual fantasies. RESULTS Fifty-one women completed the study. Mean (SD) usage of sildenafil 25mg and 50mg was, respectively, 2.8 (0.8) and 2.7 (1.3) times weekly, while mean usage of placebo was 2.8 (1.6) times weekly. During both sildenafil dosages, arousal and orgasm improved with respect to placebo (P < 0.001). Therapeutically significant differences were not noted during the treatment with both 50 mg and 25 mg of sildenafil for arousal and orgasm. The frequency of sexual fantasies and of sexual intercourse, and enjoyment, improved in the women treated with sildenafil (P < 0.05). CONCLUSIONS Our study suggests that sildenafil may improve sexual performance of women affected by sexual difficulties such as arousal disorder, and may indirectly improve other aspects of sexual life. Moreover, further studies need to define the use of PDE type 5 inhibitors in this sexual pathophysiology.
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Affiliation(s)
- S Caruso
- Department of Microbiological Science and Gynaecological Science, University of Catania, Italy
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113
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Farkas A, Chertin B, Hadas-Halpren I. 1-Stage feminizing genitoplasty: 8 years of experience with 49 cases. J Urol 2001; 165:2341-6. [PMID: 11371974 DOI: 10.1016/s0022-5347(05)66199-x] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
PURPOSE We retrospectively evaluated the results of a modified technique for 1-stage feminizing genitoplasty in children with congenital adrenal hyperplasia (CAH) and other rare intersex conditions. MATERIALS AND METHODS Between 1991 and 1998, 47 infants and 2 adolescents underwent 1-stage feminizing genitoplasty at our hospital. Of the patients 44 had CAH, 2 had the partial androgen insensitivity syndrome and 3 were true hermaphrodites. In 3 patients we used the Passerini-Glazel technique, while in 46 our technique of feminizing genitoplasty was used, which consists of maximal mobilization of the urogenital sinus en bloc including the vagina and urethra via the perineal approach. Two lateral plates built from dorsal split phallic and preputial skin together with the dorsal split urogenital sinus are used to construct the vaginal introitus and labia minora, and the scrotal folds are used to construct the labia majora. Reduction clitoroplasty is done according to the technique of Kogan et al. Mean age plus or minus standard deviation was 0.9 +/- 0.3 years of the patients with CAH and 13 +/- 2.3 of the remainder. Preoperative information, including status of the internal genitalia, anatomical length of the vagina site of communication between the vagina and urogenital sinus, in relation to the pelvic floor, was obtained by transabdominal pelvic ultrasound. RESULTS Operating time ranged between 120 and 180 minutes, average hospitalization period was 4 to 5 days and mean followup was 4.7 +/- 2.6 years. Preoperative ultrasound provided the correct data regarding the vaginal and internal genitalia anatomy in all cases, and the exact communication site between the vagina and urogenital sinus was demonstrated in 93%. Complications consisted of intraoperative rectal injury in 1 case and mild wound infection of the buttocks area in 3. In 1 case total clitoris loss was observed. All patients who underwent modified genitoplasty have had successful cosmetic and early functional results. Two patients presented with repeat clitoromegalia due to inadequate adrenal suppression. CONCLUSIONS Our adapted technique of 1-stage feminizing genitoplasty provides good cosmetic and functional results. The functional results of this operation should be reevaluated after puberty and in adulthood.
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Affiliation(s)
- A Farkas
- Department of Urology, Shaare Zedek Medical Center, Faculty of Health Science, Ben-Gurion University, Jerusalem, Israel
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114
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Abstract
Congenital adrenal hyperplasia (CAH) is the most common cause of ambiguous genitalia in newborns. This paper is based upon review of the literature and personal experience. We focus upon the surgical anatomy, pre-operative evaluation, including imaging, mainly by transabdominal ultrasound, and upon the goals and the history of surgical reconstruction. The various surgical techniques are mentioned with a detailed description of our technique used in 52 patients. The timing and staging of the operation and the implications of prenatal therapy are discussed. In conclusion, we believe that infants with 46XX CAH can undergo one-stage feminizing genitoplasty very early in life with satisfactory cosmetic and functional results.
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Affiliation(s)
- A Farkas
- Department of Urology, Shaare Zedek Medical Center, Jerusalem, Israel.
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115
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Meyer-Bahlburg HF. Gender and sexuality in classic congenital adrenal hyperplasia. Endocrinol Metab Clin North Am 2001; 30:155-71, viii. [PMID: 11344934 DOI: 10.1016/s0889-8529(08)70024-0] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The current debate about the psychosocial management of intersex patients has significant implications for 46,XX patients with classic congenital adrenal hyperplasia (CAH) in two respects: (1) the question of genital surgery for reasons other than purely medical ones before the patient is old enough to give informed consent, and (2) the question of gender assignment in severely masculinized patients. This article reviews the status of the empirical evidence for the development of gender and sexuality in 46,XX persons with classic CAH and its implications for clinical practice.
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Affiliation(s)
- H F Meyer-Bahlburg
- New York State Psychiatric Institute, Columbia University, New York, New York, USA.
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116
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Abstract
PURPOSE We have previously defined the anatomy of the neurovascular bundle in the normal and hypospadiac penis. Historical experience suggests that mobilization of the neurovascular bundle is anatomically possible. We attempt to prove whether mobilization of the neurovascular bundle is safe and theoretically sound. Specific questions that will be addressed are does the neurovascular bundle send perforating branches into the corporal bodies; how far lateral does the dissection need to be before nerves are injured and exactly how deep into Buck's fascia must one go. MATERIALS AND METHODS A total of 35 normal human fetal penile specimens, gestational age 8 to 35 weeks, and 3 hypospadiac specimens, 33 to 41 weeks of gestation, were serially sectioned and stained with Mason's trichrome and the neuronal markers PGP 9.5 or S100. Computer reconstruction using commercial software and National Institutes of Health imaging allowed 3-dimensional analysis of the nerves, corporal bodies and glans. RESULTS Perforating nerves into the erectile bodies were not documented along the dorsal or lateral aspect of the tunica in any of the specimens studied. Only in the area of the crural bodies on the ventral lateral surface were nerves noted to pierce into erectile tissue. The neural network was extensive from the 11 and 1 to the 5 and 7 o'clock positions corresponding to the erectile tissue and urethral spongiosum junction. At this junction minor nerve branches were noted to perforate into the urethral spongiosum. A microscopic plane exists between the neurovascular bundle and tunica of the corporal bodies measuring 20 to 30 micro. in specimens greater than 30 weeks in gestation. CONCLUSIONS Perforating branches from the dorsal lateral neurovascular bundle do not exist based on serial step sectioning and microscopic examination of male genital specimens. Surgically it is possible to elevate the neurovascular bundle but the dissection needs to remain directly on top of the tunica albuginea to prevent neuronal injury. Small perforating branches into the urethral spongiosum may be injured with unknown significance. We continue to advocate plication in the nerve-free zone at the 12 o'clock position for correction of penile curvature.
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Affiliation(s)
- L S Baskin
- Departments of Urology and Pediatrics, University of California School of Medicine, San Francisco, California 94143, USA
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Affiliation(s)
- LAURENCE S. BASKIN
- From the Department of Urology, University of California School of Medicine, San Francisco, California
- Presented at the Society for Fetal Urology Panel Discussion on Prenatal Diagnosis of Genital Anomalies, San Francisco, California, October 16, 1998
- (Baskin) Requests for reprints: Department of Urology, University of California, San Francisco, California 94143-0738
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