Anatomy of the lower hypogastric plexus applied to endometriosis: a narrative review.

OBJECTIVE: The objective of the present study is to evaluate the anatomy of the inferior hypogastric plexus, correlating it with urological pathologies, imaging exams and surgeries of the female pelvis, especially for treatment of endometriosis. MATERIAL AND METHODS: We carried out a review about the anatomy of the inferior hypogastric plexus in the female pelvis. We analyzed papers published in the past 20 years in the databases of Pubmed, Embase and Scielo, and we included only papers in English and excluded case reports, editorials, and opinions of specialists. We also studied two human fixed female corpses and microsurgical dissection material with a stereoscopic magnifying glass with 2.5x magnification. RESULTS: Classical anatomical studies provide few details of the morphology of the inferior hypogastric plexus (IHP) or the location and nature of the associated nerves. The fusion of pelvic splanchnic nerves, sacral splanchnic nerves, and superior hypogastric plexus together with visceral afferent fibers form the IHP. The surgeon's precise knowledge of the anatomical relationship between the hypogastric nerve and the uterosacral ligament is essential to reduce the risk of complications and postoperative morbidity of patients surgically treated for deep infiltrative endometriosis involving the uterosacral ligament. CONCLUSION: Accurate knowledge of the innervation of the female pelvis is of fundamental importance for prevention of possible injuries and voiding dysfunctions as well as the evacuation mechanism in the postoperative period. Imaging exams such as nuclear magnetic resonance are interesting tools for more accurate visualization of the distribution of the hypogastric plexus in the female pelvis.

Fertility- and Nerve-sparing Laparoscopic Eradication of Deep Endometriosis with Total Posterior Compartment Peritonectomy: The Kurashiki Method.

OBJECTIVE: To show technical highlights of a nerve-sparing laparoscopic eradication of deep endometriosis (DE) with posterior compartment peritonectomy. DESIGN: Demonstration of the technique with narrated video footage. SETTING: An urban general hospital. A systematic review and meta-analysis has suggested significant advantages of the nerve-sparing technique when considering the relative risk of persistent urinary retention in the treatment of DE [1]. In addition, a recent article has suggested that complete excision of DE with posterior compartment peritonectomy could be the surgical treatment of choice to decrease postoperative pain, improve fertility rate, and prevent future recurrence [2]. However, in DE, nerve-sparing procedures are even more challenging than oncologic radical procedures because the pathology resembles both ovarian/rectal cancer in terms of visceral involvement and advanced cervical cancer in terms of wide parametrial infiltration through the pelvic wall. INTERVENTIONS: The video highlights the anatomic and technical aspects of a fertility- and nerve-sparing surgery in DE with posterior compartment peritonectomy. After adhesiolysis and ovarian surgery, we developed retroperitoneal space at the level of promontory. The hypogastric nerve consists of the upper edge of the pelvic plexus, therefore the autonomic nerves were separated in a "nerve plane" by sharp interfascial dissection of the loose connective tissue layers both above (between the fascia propria of the rectum and the prehypogastric nerve fascia) and below (between the prehypogastric nerve fascia and the presacral fascia) the hypogastric nerve [3,4]. As a result of these dissections, the autonomic nerves in the pelvis were separated like a sheet with surrounding fascia. We then completely resected all DE lesions including peritoneal endometriosis while avoiding injury to the nerve plane. In a small number of our experiences, none of the patients (n = 51) required clean intermittent self-catheterization after this procedure. CONCLUSION: Fertility- and nerve-sparing laparoscopic eradication of DE with total posterior compartment peritonectomy is a feasible technique and may provide both curability of DE and functional preservation. Our nerve-sparing technique can reproducibly simplify this complex procedure.

Nerve-sparing in Gynecology.

OBJECTIVE: To demonstrate identification and dissection of the pelvic autonomic nerves in gynecologic surgery. DESIGN: Identification on the right and left pelvic pelvises, dissection and preservation of the inferior hypogastric plexus in deep endometriosis, and dissection and preservation of the pelvic autonomic nerves in radical hysterectomy. SETTING: Academic center. INTERVENTIONS: Robotic excision of the pelvic peritoneum, excision of deep endometriosis in the uterosacral ligaments, and radical hysterectomy. CONCLUSION: Pelvic autonomic nerves are easy to identify with the magnification provided with an endoscopic camera. They should be dissected and preserved whenever possible because of their important function.

Functional and molecular characterisation of the bilateral pelvic nerve crush injury rat model for neurogenic detrusor underactivity.

OBJECTIVES: To create a rat model for neurogenic detrusor underactivity (DU) by bilateral pelvic nerve crush injury (BPNI) and to study temporal changes in detrusor contractility and morphology. MATERIALS AND METHODS: Male Sprague-Dawley rats were subjected to BPNI or sham surgery and evaluated at 1, 3 and 9 weeks after surgery. Bladder function was determined in vivo by awake cystometry, micturition pattern analysis, and 24-h urine collection. Bladders were harvested for in vitro pharmacological investigation by isometric tension recording. Bladders and major pelvic ganglia were investigated by quantitative reverse transcription-polymerase chain reaction and histochemistry. RESULTS: Overflow incontinence was observed at 1 week after BPNI. At 3 and 9 weeks after BPNI, rats showed a bladder phenotype characteristic for DU with increased post-void residual urine volumes, reduced voiding efficiencies, and lower maximum pressures. In isolated bladder strips, contractile responses to KCl, carbachol, and α,ß-methylene adenosine 5'-triphosphate (α,ß-mATP) were preserved. On the other hand, neural-induced contractility was reduced after BPNI, in line with reduced expression of protein gene product 9.5 and choline acetyltransferase in the major pelvic ganglion at 1 week after BPNI. The bladder-to-body weight ratio and detrusor thickness increased after BPNI, indicating detrusor hypertrophy to compensate for the reduced neural input. CONCLUSIONS: BPNI induces a rat model for neurogenic DU. In this model, the detrusor maintains its contractility but denervation of the detrusor was observed.

Anatomic Cartography of the Hypogastric Nerves and Surgical Insights for Autonomic Preservation during Radical Pelvic Procedures.

STUDY OBJECTIVE: To clarify the relationship of hypogastric nerves (HNs) with several pelvic anatomic landmarks and to assess any anatomic differences between the 2 sides of the pelvis, both in cadaveric and in vivo dissections. DESIGN: Prospective observational study. SETTING: An anatomic theater for cadaveric dissections and a university hospital for in vivo laparoscopy. PATIENTS: Five nulliparous female cadavers underwent laparotomic dissection; 10 nulliparous patients underwent laparoscopic surgery for rectosigmoid endometriosis without posterolateral parametrial infiltration. INTERVENTIONS: Measurements of the closest distance between HNs and ureters, the midsagittal plane, the midcervical plane, and uterosacral ligaments on both hemipelvises. A comparison of anatomic data of the 2 hemipelvises was conducted. MEASUREMENTS AND MAIN RESULTS: The right and left HNs were identified in all specimens, both on cadavers and in vivo dissections. A wide anatomic variability was reported. Regarding the differences between the 2 hemipelvises, we found that the right HN was significantly (p <.001) farther to the ureter (mean = 14.5 mm; range, 10-25 mm) than the left one (mean = 8.6 mm; range, 7-12 mm). The HN was closer to the midsagittal plane on the right side (mean = 14.6 mm; range, 12-17 mm) than on the left side (mean = 21.6 mm; range, 19-25 mm). The midcervical plane was found 2.7 mm (range, 2-4 mm) to the left of the midsagittal one. The right HN was found to be nonsignificantly closer to the midcervical plane and the uterosacral ligament on the right side than on the left side (p >.05). CONCLUSIONS: Despite a wide anatomic variability of position and appearance, the HNs are reproducibly identifiable using an "interfascial" technique and considering the ureters and uterosacral ligaments as anatomic landmarks.

Three-Dimensional Modelization of the Female Human Inferior Hypogastric Plexus: Implications for Nerve-Sparing Radical Hysterectomy.

BACKGROUND/AIMS: This study aims to describe the autonomic nervous network of the female pelvis with a 3D model and to provide a safe plane of dissection during radical hysterectomy for cervical cancer. METHODS: Pelvises of 3 human female fetuses were studied by using the computer-assisted anatomic dissection. RESULTS: The superior hypogastric plexus (SHP) was located at the level of the aortic bifurcation in front of the sacral promontory and divided inferiorly and laterally into 2 hypogastric nerves (HN). HN ran postero-medially to the ureter and in the lateral part of the uterosacral ligament until the superior angle of the inferior hypogastric plexus (IHP). IHP extended from the anterolateral face of the rectum, laterally to the cervix and attempted to the base of the bladder. Vesical efferences merged from the crossing point of the ureter and the uterine artery and ran through the posterior layer of the vesico-uterine ligament. CONCLUSIONS: The SHP could be injured during paraaortic lymphadenectomy. Following the ureter and resecting the medial fibrous part of the uterosacral ligament may spare the HN. No dissection should be performed under the crossing point of the ureter and the uterine artery.

Determining integrity of bladder innervation and smooth muscle function 1 year after lower spinal root transection in canines.

AIMS: To assess bladder smooth muscle function and innervation after long-term lower spinal root transection in canines. METHODS: Thirteen female mixed-breed hound dogs underwent bladder decentralization, which included transection of all sacral dorsal and ventral roots caudal to L7 and hypogastric nerves, bilaterally (n = 3); all sacral roots and hypogastric nerves plus transection of L7 dorsal roots, bilaterally (n = 4); or a sham operation (n = 6). At a year after initial surgery, bladder function was assessed in vivo by stimulation of the pelvic plexus. The bladder tissue was harvested for ex vivo smooth muscle contractility studies. Remaining bladder was evaluated for nerve morphology immunohistochemically using neuronal marker PGP9.5, apoptotic activity using terminal deoxynucleotidyl transferase dUTP nick end labeling, and histopathology using a hematoxylin and eosin stain. RESULTS: Sacral root decentralization did not reduce maximum strength of pelvic plexus stimulation-induced bladder contraction, although long-term sacral dorsal and ventral root plus L7 dorsal root transection significantly decreased contraction strength. Electric field stimulation-induced contractions of the detrusor from all decentralized animals were preserved, compared to controls. Viable nerves and intramural ganglia were visualized in the bladder wall, regardless of group. There was no difference in amount of apoptosis in bladder smooth muscle between groups. CONCLUSION: Bladder smooth muscle cells maintain their function after long-term bladder decentralization. While pelvic plexus-induced bladder contractions were less robust at 1 year after lower spinal root transection, the absence of atrophy and preservation of at least some nerve activity may allow for successful surgical reinnervation after long-term injury.

Effect of TRPV4 activation in a rat model of detrusor underactivity induced by bilateral pelvic nerve crush injury.

AIMS: To produce an animal model of peripheral neurogenic detrusor underactivity (DU) and to evaluate the effect of TRPV4 receptor activation in this DU model. METHODS: In female Sprague-Dawley rats, bilateral pelvic nerve crush (PNC) was performed by using sharp forceps. After 10 days, awake cystometrograms (CMG) were recorded in sham and PNC rats. A TRPV4 agonist (GSK 1016790A) with or without a TRPV4 antagonist (RN1734) were administered intravesically and CMG parameters were compared before and after drug administration in each group. The TRPV4 transcript level in the bladder mucosa and histological changes were also evaluated. RESULTS: In CMG, PNC rats showed significant increases in intercontraction intervals (ICI), number of non-voiding contractions (NVCs), baseline pressure, threshold pressure, bladder capacity, voided volumes, and post-void residual (PVR) compared to sham rats. Contraction amplitude and voiding efficiency were significantly decreased in PNC rats. In PNC rats, intravesical application of GSK1016790A (1.5 µM) significantly decreased ICI, bladder capacity, voided volume, and PVR without increasing NVCs, and these effects were blocked by RN1734 (5.0 µM). In contrast, 1.5 µM GSK1016790A had no significant effects on CMG parameters in normal rats. TRPV4 expression within the bladder mucosa of PNC rats was increased in association with urothelial thickening. CONCLUSIONS: Rats with bilateral PNC showed characteristics of DU, and this model seems appropriate for further evaluation of peripheral neurogenic mechanisms of DU. Also, TRPV4 receptors, the activation of which reduced bladder capacity and PVR, could be a target for DU treatment.

Nerve-Sparing Technique during Laparoscopic Radical Hysterectomy: Critical Steps.

STUDY OBJECTIVE: To show the feasibility and safety of nerve-preserving laparoscopic radical hysterectomy (type C1 Querleu-Morrow Classification [1]) for the treatment of early cervical cancer. DESIGN: A surgical video article (Canadian Task Force classification III). SETTING: A university hospital (University Hospital of Barcelona, Barcelona, Spain). PATIENTS: Nerve-preserving radical hysterectomy is performed in a patient with Fédération Internationale de Gynécologie et d'Obstétrique stage 1B1 cervical cancer with deep stromal invasion. INTERVENTIONS: Three steps are fundamental for the removal of the cérvix with a safe oncologic margin and preservation of the pelvic autonomic nerves [2]. 1. Step 1: for the correct preservation of the pelvic splanchnic nerves (ventral roots from spinal nerves S2-S4) and the inferior hypogastric plexus during the section of the paracervix, it is essential to identify the deep uterine vein. This vein will correspond with the inferior limit of the dissection. 2. Step 2: during the dissection of the uterosacral ligament and after dissecting the Okabayashi space, the inferior hypogastric nerve is isolated. This nerve runs 2 cm parallel below the uterosacral ligament in the peritoneal leaf of the broad ligament. 3. Step 3: during the section of the vesicouterine ligament, the lateral side must be preserved because it includes the medial and inferior vesical veins that drain to the deep uterine vein. CONCLUSION: Nerve-sparing laparoscopic radical hysterectomy is an attractive surgical approach for early-stage cervical cancer. Direct visualization of the pelvic autonomic nervous system (sympathetic and parasympathetic branches) innervating the bladder and rectum makes the nerve-sparing approach a safe and feasible procedure.

Impotence Following Radical Prostatectomy: Insight into Etiology and Prevention.

This study was undertaken to identify the cause of impotence in men undergoing radical prostatectomy, with the hope that this information may provide insight into the possible prevention of this complication. The autonomic innervation of the corpora cavernosa in the male fetus and newborn was traced to determine the topographical relationship between the pelvic nerve plexus, and the prostate, urethra and urogenital diaphragm. We have demonstrated that the branches of the pelvic plexus that innervate the corpora cavernosa are situated between the rectum and urethra, and penetrate the urogenital diaphragm near or in the muscular wall of the urethra. Injuries to the pelvic plexus can occur in 2 ways: 1) during division of the lateral pedicle and 2) at the time of apical dissection with transection of the urethra. Thirty-one men who underwent radical retropubic prostatectomy were evaluated to determine risk factors that correlated with postoperative impotence: 5 (16 per cent) were fully potent, 7 (23 per cent) had partial erections that were inadequate for sexual intercourse and 19 (61 per cent) had total erectile impotence. The 2 factors that had a favorable influence on postoperative potency were age and pathologic stage of the lesion: 31 per cent of the patients less than 60 years old were potent versus only 6 per cent of the patients more than 60 years, while 33 per cent of the patients with tumor microscopically confined to the prostatic capsule were potent versus only 5 per cent of those with capsular penetration. When the factors of age and capsular penetration were combined 60 per cent of the men less than 60 years old who had an intact prostatic capsule were potent. Arterial insufficiency and psychogenic factors were excluded as major contributing factors by the finding of normal penile blood flow and absence of nocturnal penile tumescence in the impotent patients. We conclude that impotence after radical prostatectomy results from injury to the pelvic nerve plexus that provides autonomic innervation to the corpora cavernosa. Further studies will be necessary to determine whether refinements in surgical technique, especially during ligation of the lateral pedicle and apical dissection, can prevent this complication.

Pelvic nerve injury negatively impacts female genital blood flow and induces vaginal fibrosis-implications for human nerve-sparing radical hysterectomy.

OBJECTIVE: This study sought to develop a novel animal model to study the impact of nerve-sparing radical hysterectomy (NSRH) on female genital blood flow. DESIGN: In vivo animal study. POPULATION: Thirty Sprague-Dawley female rats. MATERIALS AND METHODS: Female rats underwent either unilateral pelvic nerve (PN) crush (PNC; n = 9), or crush of both the PNs and all efferent nerves in the pelvic plexus ('clock-nerve crush', CNC; n = 9). Under anaesthesia, we electrically stimulated the crushed PN at 3 and 10 days after crush while monitoring blood pressure and recording clitoral and vaginal blood flows by laser Doppler. Uninjured PNs were stimulated as an internal control. Twelve additional rats were assigned either to bilateral PNC or sham surgery, and genital tissues were processed 10 days after injury for in vitro analysis. MAIN OUTCOME MEASURES: Genital blood flow, nNOS, eNOS, collagen I-III. RESULTS: Stimulation of the crushed PN in both groups subjected to PNC and CNC induced significantly lower peak genital blood flow at 3 and 10 days (P < 0.05) compared to stimulation of the non-crushed control PN. The immunofluorescence and Western blot analyses revealed that all injured rats exhibited more vaginal collagen III and collagen I than rats did that ad undergone sham surgeries (P < 0.05). PCN reduced nNOS expression in both clitoral and vaginal tissue. CONCLUSIONS: Based on our study it may be hypothesised that NSRH might cause reductions of genital blood flow and vaginal fibrosis due to neurapraxia of the pelvic nerve and reductions of nNOS nerve fibres in clitoral and distal vaginal tissue. TWEETABLE ABSTRACT: Pelvic nerve neurapraxia during nerve-sparing radical hysterectomy could lead to sexual arousal dysfunction.

[Nerve-preserving low anterior rectum resection]. / Nervenschonende offene tiefe anteriore Rektumresektion beim Rektumkarzinom.

AIM: The Performance of an oncological low anterior rectum resection with preservation of the sympathic and parasympathic nerves is illustrated. INDICATION: The total mesorectal excision (TME) by Robert Heald et al. is the gold standard for rectal cancer operations which has lowered drastically the local recurrence rate. As the survival data improve, the new focus is the postoperative quality of life with preserving of the bladder and sexual function. METHOD: We demonstrate an anterior rectal cancer operation with preserving of the sympathetic and parasympathetic nerves step by step. CONCLUSION: The critical parts of preserving the nerves with the N. hypogastricus superior and inferior as well as the neurovascular bundle "erigent pillar" are demonstrated.

Decrease in neuronal nicotinic acetylcholine receptor subunit and PSD-93 transcript levels in the male mouse MPG after cavernous nerve injury or explant culture.

Quantitative real-time PCR was used to test whether cavernous nerve injury leads to a decrease in major pelvic ganglia (MPG) neuronal nicotinic ACh receptor (nAChR) subunit and postsynaptic density (PSD)-93 transcript levels. Subunits α3, ß4, and α7, commonly expressed in the MPG, were selected for analysis. After 72 h in explant culture, MPG transcript levels for α3, ß4, α7, and PSD-93 were significantly depressed. Three days after cavernous nerve axotomy or crush in vivo, transcript levels for α3, ß4, and PSD-93, but not for α7, were significantly depressed. Three days after dissection of the cavernous nerve free of underlying tissue and application of a 5-mm lateral stretch (manipulation), transcript levels for α3 and PSD-93 were also significantly decreased. Seven days after all three surgical procedures, α3 transcript levels remained depressed, but PSD-93 transcript levels were still decreased only after axotomy or nerve crush. At 30 days postsurgery, transcript levels for the nAChR subunits and PSD-93 had recovered. ACh-induced currents were significantly smaller in MPG neurons dissociated from 3-day explant cultured ganglia than from those recorded in neurons dissociated from acutely isolated ganglia; this observation provides direct evidence showing that a decrease in nAChR function was coincident with a decrease in nAChR subunit transcript levels. We conclude that a downregulation of nAChR subunit and PSD-93 expression after cavernous nerve injury, or even manipulation, could interrupt synaptic transmission within the MPG and thus contribute to the loss of neural control of urogenital organs after pelvic surgeries.

Whole genome microarray of the major pelvic ganglion after cavernous nerve injury: new insights into molecular profile changes after nerve injury.

UNLABELLED: What's known on the subject? and What does the study add? With the present study, we aimed to provide a global picture of the molecular processes that are activated by CN injury. The present study used genomic expression profiling to identify candidate genes that might be useful targets in the CN recovery process and, thus, the ultimate preservation of penile erection. Regeneration of the CN and axonal outgrowth clearly involve changes in multiple biochemical pathways that have never been investigated by microarray analysis. We analyzed global gene expression in the major pelvic ganglion at early stages (48 h and 14 days) after CN injury and focused on the detection of changes in genes related to nervous tissue repair and proliferation. The findings of the present study provide important insight into the molecular systems affected by CN injury and identify candidate genes that may be utilized for novel molecular-based therapies for the preservation and protection of the CN during RP. OBJECTIVES: To to examine the complexity of the many molecular systems involved in supporting cavernous nerve (CN) repair and regeneration in a rat model of bilateral crush injury utilizing a microarray analysis approach. Erectile dysfunction (ED) is a common clinical complication after prostate cancer treatment by radical prostatectomy, and recovery of erectile function can take as long as 2 years. There are gaps in our understanding of the autonomic pelvic innervation of the penis that still need to be addressed for the development of an adequate treatment strategy for post-prostatectomy ED. The molecular mechanisms of the intrinsic ability of CN to regenerate after an injury have not been elucidated. MATERIALS AND METHODS: We analyzed global gene expression in the major pelvic ganglion 48 h and 14 days after CN injury. Overall, a comparative analysis showed that 325 genes changed at the 48-h time point and 114 genes changed at 14 days. There were 60 changed genes in common with both time points. Using the Ingenuity Pathway Analysis® system (Ingenuity Systems, Inc., Redwood City, CA, USA), we were able to analyze the significantly changed genes that were unique and common to each time point by biological function. We focused on the detection of changes related to nervous tissue repair and proliferation, molecular networks of neurotrophic factors, stem cell regulation and synaptic transmission. RESULTS: There was strong evidence of the early mobilization of genes involved in repair and neuroprotection mechanisms (SERPINF1, IGF1, PLAU/PLAUR, ARG1). Genes related to nervous system development (ATF3 GJA1, PLAU, SERPINE1), nerve regeneration (SERPINE2, IGF1, ATF3, ARG1) and synaptic transmission (GJC1, GAL) were changed. Several genes related to proliferation as well as apoptosis (A2M, ATF3, C3, EGR4, FN1, GJA1, GAL) were also changed, possibly as part of a protective mechanism or the initiation of remodelling. CONCLUSIONS: The results obtained show that multiple biological processes are associated with injury and repair of the CN and provide a systematic genome-wide screen for neurotrophic and/or inhibitory pathways of nerve regeneration. These data identify the candidate genes that may be utilized in novel molecular-based therapies for the preservation and protection of the CN during radical prostatectomy.

The somatic and autonomic innervation of the clitoris; preliminary evidence of sexual dysfunction after minimally invasive slings.

INTRODUCTION: Vaginal sling procedures may have a negative effect on sexual function due to damage to vascular and/or neural genital structures. Even though autonomic innervation of the clitoris plays an important role in female sexual function, most studies on the neuroanatomy of the clitoris focus on the sensory function of the dorsal nerve of the clitoris (DNC). The autonomic and somatic pathways in relationship to sling surgery have up to the present not been described in detail. AIM: The aim of this study is to reinvestigate and describe the neuroanatomy of the clitoris, both somatic and autonomic, in relation to vaginal sling procedures for stress urinary incontinence. METHOD: Serially sectioned and histochemically stained pelves from 11 female fetuses (10-27 weeks of gestation) were studied, and three-dimensional reconstructions of the neuroanatomy of the clitoris were prepared. Fourteen adult female hemipelves were dissected, after a tension-free vaginal tape (TVT) (7) or tension-free vaginal tape-obturator (TVT-O) (7) procedure had been performed. MAIN OUTCOME MEASURES: Three-dimensional (3-D) reconstruction and measured distance between the clitoral nerve systems and TVT/TVT-O. RESULTS: The DNC originates from the pudendal nerve in the Alcock's canal and ascends to the clitoral bodies. In the dissected adult pelves, the distance of the TVT-O to the DNC had a mean of 9 mm. The cavernous nerves originate from the vaginal nervous plexus and travel the 5 and 7 o'clock positions along the urethra. There, the autonomic nerves were found to be pierced by the TVT needle. At the hilum of the clitoral bodies, the branches of the cavernous nerves medially pass/cross the DNC and travel further alongside it. Just before hooking over the glans of the clitoris, they merge with DNC. CONCLUSION: The DNC is located inferior of the pubic ramus and was not disturbed during the placement of the TVT-O. However, the autonomic innervation of the vaginal wall was disrupted by the TVT procedure, which could lead to altered lubrication-swelling response.

Nerve-sparing surgery for deep lateral parametrial endometriosis.

OBJECTIVE: Although dLPE is not overly rare, isolation of the autonomic nerves from dLPE cannot always be guaranteed. In patients with endometriosis lesions that are embedded in the deep parametrium, nerve-sparing techniques are no longer considered feasible, except for those with unilateral involvement. However, even one-sided radical parametrectomy may actually lead to bladder dysfunction, which seriously affects the quality of life. Therefore, the objective is to demonstrate the anatomical and technical highlights of nerve-sparing laparoscopic surgery for deep lateral parametrial endometriosis (dLPE). DESIGN: Stepwise demonstration of this method with a narrated video footage. SETTING: An urban general hospital. PATIENT(S): A 38-year-old woman, para 1, presented with a 5-year history of severe chronic pelvic and gluteal pain, all of which were resistant to pharmacotherapy. The patient showed no neurological disorders, such as bladder dysfunction. Magnetic resonance imaging revealed right ovarian endometrioma and hydrosalpinx with dLPE reaching the lateral pelvic wall. Based on the dermatome involved, we suspected that the main lesion causing gluteal pain was located around the second and third sacral roots. INTERVENTION(S): Laparoscopic excision of dLPE with a pelvic autonomic nerve-sparing technique, decompression of somatic nerves and preservation of all branches of the internal iliac vessels. Assessment of preserved tissue perfusion using indocyanine green. The procedure was performed using 8 steps, as follows: step 1, adhesiolysis and adnexal surgery; step 2, complete ureterolysis; step 3, identification and dissection of the hypogastric nerve and inferior hypogastric plexus with development of the pararectal space; step 4, dissection of the internal iliac vessels; step 5, identification and dissection of the sacral roots S2-S4 and the pelvic splanchnic nerves; step 6, complete removal of dLPE; step 7, hemostasis and assessment of tissue perfusion using indocyanine green; and step 8, application of barrier agents to prevent adhesion. Dissection of the pelvic nerves before dLPE excision revealed the relationship between the lesions and pelvic innervation, thereby reducing the risk of nerve injury, whether by minimizing the risk of neuropraxia or by allowing as many nerve fibers as possible to be spared in patients with some invasion of the pelvic nerve system. We considered even partial preservation of these nerves as beneficial to the resumption of pelvic organ functions. The step-by-step technique should help perform each stage of the surgery in a logical sequence, ensuring easy and safe completion of the procedure. MAIN OUTCOME MEASURE(S): Relief from severe pain, avoidance of postoperative morbidity (including intermittent self-catheterization). RESULT(S): The patient developed no perioperative complications, including postoperative bladder, rectal, or sexual dysfunctions. Pain was completely resolved. CONCLUSION(S): Nerve-sparing surgery is technically safe and feasible for selected patients with dLPE. Suitably tailored treatment should be provided for each individual based on both latest scientific evidence and life planning for the patient.

Recovery of colonic transit following extrinsic nerve damage in rats.

INTRODUCTION: Injury to pelvic sympathetic and parasympathetic nerves from surgical and obstetrical trauma has long been cited as a cause for abnormal colorectal motility in humans. Using a rat model, acute transaction of these extrinsic nerves has been shown to effect colorectal motility. The aim of this study is to determine in a rat model how transection of these extrinsic nerves affects colonic transit over time. METHODS: Eighty-two Sprague-Dawley rats underwent placement of a tunneled catheter into the proximal colon. Bilateral hypogastric, pelvic nerves (HGN and PN) or both were transected in 66 rats. The remaining 16 rats received a sham operation. Colonic transit was evaluated at postoperative days (PODs) 1, 3, and 7 by injecting and calculating the geometric center (GC) of the distribution of (51)Cr after 3 h of propagation. RESULTS: At POD 1, transection of PNs significantly delayed colonic transit (GC = 4.9, p < 0.05), while transection of HGNs (GC = 8.5, p < 0.05) or transection of both nerves (GC = 7.8, p < 0.05) significantly accelerated colonic transit, when compared with sham operation (GC = 6.0). A significant trend toward recovery was noted in both the HGN and PN transection groups at POD 7. CONCLUSIONS: Damage to the extrinsic sympathetic and/or parasympathetic PNs affects colonic transit acutely. These changes in large bowel motor function normalize over time implicating a compensatory mechanism within the bowel itself.

Where does pelvic nerve injury occur during rectal surgery for cancer?

AIM: Optimal treatment of rectal adenocarcinoma involves total mesorectal excision with nerve-preserving dissection. Urinary and sexual dysfunction is still frequent following these procedures. Improved knowledge of pelvic nerve anatomy may help reduce this and define the key anatomical zones at risk. METHOD: The MEDLINE database was searched for available literature on pelvic nerve anatomy and damage after rectal surgery using the key words 'autonomic nerve', 'pelvic nerve', 'colorectal surgery', and 'genitourinary dysfunction'. All relevant French and English publications up to May 2010 were reviewed. Reviewed data were illustrated using 3D reconstruction of the foetal pelvis. RESULTS: The ligation of the inferior mesenteric artery and dissection of the retrorectal space can cause damage to the superior hypogastric plexus and/or hypogastric nerve. Anterolateral dissection in the 'lateral ligament' area and division of Denonvilliers' fascia can damage the inferior hypogastric plexus and efferent pathways. Perineal dissection can indirectly damage the pudendal nerve. CONCLUSIONS: In most cases, the pelvic nerves can be preserved during rectal surgery. Complete oncological resection may require dissection close to the nerves where the tumour is located anterolaterally where it is fixed and when the pelvis is narrow.

Interstitial Cystitis/Bladder Pain Syndrome as Referred Pain From Injured T12/L1 Nerves: Symptomatic Improvement With Resection of Ilioinguinal and Iliohypogastric Nerves.

OBJECTIVE: To evaluate the specific contribution of ilioinguinal (II) and iliohypogastric (IH) nerve injury and referred pain to interstitial cystitis/bladder pain syndrome and patient-reported chronic pelvic pain, and to enumerate the effects of II and IH nerve resection on the pain and voiding symptoms in patients with IC/BPS. MATERIALS AND METHODS: This was a prospective cohort study of 8 patients with ICS/BPS who had prior abdominal surgery. All patients received diagnostic image guided T12/L1 nerve blocks, followed by II and IH nerve resections. Validated O'Leary-Sant ICS symptom indices (OSPI) and pelvic pain and urgency/frequency patient symptoms scale (PUF) scores were collected at specified intervals pre- and post-operatively. RESULTS: Median scores at pre-operative (OSPI 13.9, PUF 20.4) and 1 week time points (OSPI 5.9, PUF 11), as well as differences between pre-operative and 10 month time points (OSPI 3.7, PUF 6) were all statistically significant (P = .008 and .009 at 1 week, and .007 and .008 at 10 months, for OSPI and PUF respectively). The mean difference in score from pre-operative to longest follow-up as measured by the OSPI was -14.4 (P < .001) and by PUF -10.3 (P < .001). All time points registered demonstrated improvement in pain scores. There were no surgical complications or adverse events. CONCLUSION: II and IH nerve resection may be an effective and durable treatment option for those with prior abdominal surgery who have referred interstitial cystitis/bladder pain syndrome pain from these injured nerves.

Nerve sparing in radical surgery for early-stage cervical cancer: yes we should!

Radical hysterectomy with pelvic lymphadenectomy is considered to be the cornerstone in the treatment of early-stage cervical cancer. Although survival in early-stage cervical cancer is up to 95%, long-term morbidity with regard to bladder, bowel, and sexual function is considerable. Damage to the pelvic autonomic nerves may be the cause of these long-term complications following radical hysterectomy. Some authors have presented surgical techniques to preserve the autonomic nerves (ie, the hypogastric nerves and the splanchnic nerves) without compromising radicality. Safety, efficacy, and the surgical techniques of nerve-sparing radical hysterectomy are presented, and data confirm that whenever the decision is made to perform a radical hysterectomy, nerve-sparing techniques should be considered.