Uterosacral ligament fixation for vaginal vault suspension in uterine and vaginal vault prolapse

OBJECTIVE: The purpose of this study was to determine the simplicity, safety, anatomic, and functional success of using the uterosacral ligaments for correction of significant complex uterine and vaginal vault prolapse by the vaginal route. STUDY DESIGN: Fifty women with uterine or vaginal vault prolapse with descent of the cervix or the vaginal vault to the introitus or greater were treated between 1993 and 1996 by the same surgeon with bilateral uterosacral ligament fixation to the vaginal cuff by the vaginal route. Included were patients with significant enterocele, cystourethrocele, rectocele, and stress urinary incontinence who had concomitant repair of coexisting pelvic support defects. An etiology of vaginal vault prolapse is discussed. RESULTS: Uterosacral ligaments were identified and used for successful vaginal vault suspension by the vaginal route in all 50 consecutive patients without subsequent failure or significant complications with a maximum follow-up of 4 years. One patient had recurrent stress urinary incontinence and two had asymptomatic cystoceles. Three patients had erosion of monofilament sutures at the vaginal apex. CONCLUSIONS: In these 50 patients with significant complex uterine or vaginal vault prolapse, uterosacral ligaments could always be identified and safely used for vaginal vault suspension by the vaginal route with no persistence or recurrence of vaginal vault prolapse 6 to 48 months after surgery. Excessive tension by the surgeon on tagged uterosacral ligaments at the time of hysterectomy may be an etiologic factor in vaginal vault prolapse.     

Laparoscopy-assisted radical vaginal hysterectomy modified according to Schauta-Stoeckel

In laparoscopy-assisted radical vaginal hysterectomy, laparoscopy is used to develop the paravesical and pararectal spaces. The cardinal ligament is isolated and cut after bipolar coagulation to the level of the deep uterine vein. By the vaginal approach, the ureters are identified before their entry into the bladder pillar. The uterine vessels are pulled down until their laparoscopically coagulated ends become visible. After incision of the vesicocervical reflection, the uterine fundus is grasped and developed (D?derlein maneuver). The lower cardinal and uterosacral ligaments are exposed by pulling the cervix and fundus uteri to the contralateral side. The cardinal and uterosacral ligaments are dissected and ligated, and the specimen is removed. We combined laparoscopic lymphadenectomy with radical vaginal hysterectomy in 33 women with cervical cancer. The mean operating time was 80 minutes for the vaginal phase and 215 minutes for the laparoscopic phase, including paraaortic and pelvic lymphadenectomy and preparation of the cardinal ligaments. Blood transfusions were necessary in four women. Three patients sustained injury to the bladder, one patient to the left ureter, and another patient to the left internal iliac vein. Repair was achieved at primary surgery for all intraoperative complications. No fistula was observed. The patients had fully recuperated after a mean of 28 days. The laparoscopy-assisted Schauta-Stoeckel approach may prove to be a safe alternative to conventional radical abdominal hysterectomy.     

Carbon dioxide laser for laparoscopic enterocele repair

The use of the carbon dioxide (CO2) laser for laparoscopic enterocele repair was evaluated in four women with an enterocele as the only pathology. Three women had a large enterocele after earlier hysterectomy, and one young woman had a congenital enterocele. The technique consists of vaporizing the peritoneum of the enterocele; however, it is important first to delineate carefully the lesion's circumference because of the strong retraction during vaporization. Subsequently, a posterior culdotomy is performed taking care to restore the horizontal position of the upper vaginal axis by shortening the uterosacral ligaments, which are sutured together on the midline and the posterior vaginal wall. The (CO2) laser has the advantage that the superficial vaporization it produces is rapid (<5 min), safe, and completely bloodless. The shrinking during vaporization facilitates subsequent repair. Postoperative morbidity and recovery were uneventful for all patients. The (CO2) laser seems to have some advantages over sharp endoscopic resection of enteroceles. The relative simplicity of technique and the low postoperative morbidity suggest that endoscopy could become routine in pelvic floor surgery, improving diagnosis and complementing vaginal surgery while avoiding laparotomy.     

The UCLA surgical approach to sphincteric incontinence in women

Stress urinary incontinence (SUI) in the female may be treated by a variety of non-surgical and surgical therapies. However, once the patient has chosen to undergo operative repair the ideal procedure is based on three considerations: the degree of anterior vaginal wall prolapse, the degree of incontinence and associated anatomic abnormalities requiring surgical repair. In the vast majority of cases vaginal wall sling is our procedure of choice for the surgical treatment of SUI in the female. Vaginal wall sling is based on sound anatomic principles, may be performed as an outpatient procedure and is equally efficacious for the treatment of SUI due to anatomic incontinence (urethral hypermobility) and intrinsic sphincter deficiency. Since vaginal wall sling is performed through a transvaginal approach, other associated manifestations of pelvic floor prolapse such as rectocele can be addressed and repaired simultaneously. When necessary the vaginal wall sling can be easily modified to repair large grade cystoceles.     

Clinical interpretations of transient otoacoustic emissions

The object was to study retrospectively the perioperative complications and results of the Bologna procedure for the treatment of stress urinary incontinence associated with cystocele grade 2 or more. In the study, 80 patients underwent a repair of all defects of pelvic support plus the Bologna procedure. Mean duration of follow-up was 40.2 months (range 3-127). The incidence of operative complications was 2.5% for inadvertent cystostomy and for hemorrhage. Mean hospital stay was 7.2 days (range 2-17). At 2-year follow-up 85% of the patients were completely free of incontinence symptoms (95% CI: 75-92) and 76% at 3-year follow-up (95% CI: 66-86). None of the parameters tested in a univariate analysis was independently linked with surgical failure. Further studies are needed to establish the place of this technique in the surgical management of urinary incontinence associated with genital prolapse.     

Encapsulated Enterococcus faecalis: role of encapsulation in persistence in mouse peritoneum in absence of mouse lethality

In 54 patients, transvaginal sacrospinous ligament fixation procedures were reviewed retrospectively. The mean operation time was 15 (12-45) min. The mean blood loss was 126 (110-175) cm3. The only intraoperative complication was a rectal laceration that was repaired primarily. The mean duration of follow-up was 28 (4-54) months. There were only 2 recurrent vaginal vault prolapses. There were 3 cases of cystocele (5.5%), 1 case of rectocele (1.8%), 5 cases of enterocele (9.2%), 3 cases of stress incontinence (5.5%), and 5 cases of dysparonia (9.2%). Sacrospinous ligament fixation can be used as an alternative treatment to vaginal hysterectomy in aged women with medical problems and young women suffering from genital descent with infertility. The procedure has the advantage of avoiding laparatomy, facilitating other vaginal repairs needed during the same operation, preserving vaginal function and shortening the time necessary for anesthesia and surgery.     

Hearing loss and vestibular dysfunction in childhood from the use of streptomycin in Albania

OBJECTIVE: To analyze which factors, including gynecological surgery in particular, contribute to the occurrence of pelvic relaxation. METHOD: A retrospective analysis of 711 consecutive patients treated surgically for pelvic relaxation from 1983 to 1989 at the Department of Obstetrics and Gynecology of Turku University Central Hospital was undertaken. RESULT: The patients who underwent surgery for recurrent pelvic relaxation were significantly older (66.8 vs. 62.1 years) and suffered significantly less (20% vs. 41%) from urinary stress incontinence than patients undergoing primary surgery for pelvic relaxation. Anterior vaginal segment relaxation (i.e. cysto- and urethrocele) was common in patients undergoing the initial operation (n = 684), and posterior vaginal segment relaxation (i.e. rectocele and perineal laceration) in recurrent operations (n = 58). Of the patients studied, 87 had pelvic relaxation, which had developed after partial (n = 46), total abdominal (n = 16) or vaginal (n = 25) hysterectomy. CONCLUSION: Care must be taken in the treatment of the posterior vaginal segment during the initial operation for pelvic relaxation in order to avoid late sequelae. Moreover, when the removal of the uterus is planned, the matter of a stable vaginal vault must be taken into account especially when partial hysterectomy should be performed.     

Gonadotropin triggers the generation of proteinaceous factor in vitellogenic perch (Anabas testudineus) oocyte which stimulates ovarian aromatase activity

OBJECTIVE: Evaluation of the feasibility of bilateral sacropinous ligament suspension with a stapler. Morbidity study and short term results. STUDY DESIGN: Prospective study from July 1994 to August 1996. RESULTS: Bilateral sacrospinous ligament suspension with a stapler was possible in 100% of cases and surgical technique is described. Our indications are stage III Bp and stage IV genital prolapses (according to the American Urogynecologic Society classification, 1996), with or without uterus, and when a Bologna's procedure is performed, in order to prevent enterocele. In 24 patients, the uterus was present. 20 vaginal hysterectomies and 4 conservative bilateral uterine suspensions were performed. The sacrospinous ligament suspension was associated to anterior colporrhaphy (in 74% of patients), repair of rectocele (82%), repair of enterocele (26%), posterior colpoperineorrhaphy (79%), bladder neck suspension (71%). No vascular injury nor post operative constipation was noted. In 2 patients, a small rectal laceration occurred, and in one patient one branch of the staple transfixed the rectal mucosa. Removal of the staple was easily performed without any post-operative complication. First results after an average 19 months follow-up (range 9 to 32) shows a perfect anatomic result in 77% of cases. We noted one recurrence of a vaginal vault prolapse; the patient underwent a second sacrospinous ligament fixation with good result. One patient had a stage II Aa cystocele post-operatively and three patients had a short vagina (< 6 cm). Patients who were continent before the sacrocolpopexy did not develop further urinary stress-incontinence. CONCLUSION: Bilateral transvaginal sacrospinous ligament suspension with a stapler facilitates the procedure. No post-operative constipation was noted with this method. Our first results are good. The cost of the stappler may limit its extensive use.     

The effect of intrathecal and epidural narcotic analgesia on the length of labor

OBJECTIVE: Long-term results after different types of operations for urinary stress incontinence (minimum follow-up: 18 months) as well as multiple risk factors for the pelvic floor were analysed in a retrospective study. STUDY DESIGN: Between 1980 and 1992 1283 patients underwent surgery because of urinary stress incontinence at the University Women's Hospital in Heidelberg. The data of 478 patients, 430 of these after primary and 48 after recurrent surgery, were evaluated by questionnaires with regard to the long-term-results. RESULTS: 57% of patients after primary surgical therapy and 37% after recurrent surgery were cured for longer than 5 years or since the operation. A cure or improvement of the incontinence could be observed in 80% after primary and in 73% after recurrent surgery. Among the vaginal approaches for primary surgery the hysterectomy combined with colporrhaphy was most successful (60% cured or more than 5 years continent, 80.5% at least improved). The Burch colposuspension revealed even better results among the abdominal approaches (64% cured or longer than 5 years continent, 86% at least improved) compared to the Marshall-Marchetti-Krantz procedure with a cure rate of 33%. For therapy of the recurrent urinary incontinence the abdominal Burch colposuspension showed the best results with cure rates of 50% and cure or improvement in 75%. Therefore the abdominal approach seems to be superior to vaginal techniques such as sling operations (33% cure rate, 67% at least improved) or only re-colporrhaphy (27% cure rate, 78% at least improved). CONCLUSION: For primary incontinence the hysterectomy with vaginal repair or the Burch colposuspension have proved to be most successful. For recurrent urinary incontinence the abdominal colposuspension (Burch procedure) seems to be superior to other approaches.     

Posthysterectomy vaginal cuff fistula: diagnosis and management of an unusual cause of "incontinence"

OBJECTIVES: Connection between the vaginal cuff and the peritoneal cavity after hysterectomy is a rare event that can mimic urinary incontinence. The appropriate evaluation and treatment of these patients is discussed. METHODS: Five patients underwent excision of the vaginal cuff during a 12-month period. All of these patients had a negative workup for urinary incontinence, except for 1 patient who also had stress incontinence and required a vaginal wall sling at the time of cuff excision. RESULTS: All 5 patients are presently free of excess vaginal drainage or significantly improved, with a mean follow-up of 6 months. One patient developed stress incontinence after cuff excision and later required a vaginal wall sling. There have been no perioperative complications and no evidence of recurrent fistula. CONCLUSIONS: Fistula of the vaginal cuff is a diagnosis of exclusion after urinary incontinence has been ruled out. A high index of suspicion is often required to make the diagnosis because these patients often present with symptoms highly suggestive of urinary leakage. Fistula of the vaginal cuff is successfully treated with excision of the vaginal cuff and the fistulous tract (if identified), with minimal morbidity.     

Utilisation and cost of professional care and assistance according to disability of patients with multiple sclerosis in Flanders (Belgium)

OBJECTIVE: The aim of the study was to determine the correlation between genital prolapse and the outcome of the Burch colposuspension. MATERIAL AND METHODS: Fifty women with objectively proven recurrent incontinence after Burch colposuspension and 31 women, objectively continent after the colposuspension, were clinically examined with emphasis on genital prolapse. The preoperative vaginal profile of the women was estimated from the patient records. RESULTS: The preoperative vaginal profile demonstrated no significant differences in occurrence of prolapse components between the women who were continent after the colposuspension and those women who had recurrent incontinence. At the follow-up, rectocele and cystocele occurred with significantly higher frequencies among the women with recurrent urinary incontinence than among the women who were continent after the Burch colposuspension (80% and 46% vs. 42% and 10%; p<0.01). Enterocele and uterine/vaginal vault descent occurred in equal frequencies in the two groups. Independent of the outcome of the colposuspension, the women with rectocele were significantly younger than the women without rectocele (55 years vs. 63.5 years; p<0.01). CONCLUSIONS: The results imply an association between the occurrence of rectocele and cystocele and the outcome of the colposuspension. Different etiologies seem to exist for rectocele/cystocele, compared to enterocele or uterine/vaginal vault descent formation in women with stress urinary incontinence, operated upon with the Burch colposuspension.     

The incidence of low-pressure urethra as a function of prolapse-reducing technique in patients with massive pelvic organ prolapse (maximum descent at all vaginal sites)

OBJECTIVE: Our aims were to compare several prolapse-reducing techniques during urodynamic evaluation and prospectively evaluate their usefulness in identifying the incidence of low urethral closure pressure in continent patients with massive prolapse. STUDY DESIGN: This preoperative, prospective, repeated-measures urodynamic study evaluated the maximum urethral closure pressure with the use of four different techniques in 30 consecutive continent patients with grade 4 prolapse at all vaginal sites. Twenty patients with grade 0 prolapse served as the control group. All patients from the prolapse group underwent surgical treatment and were followed up clinically for a minimum of 1 year. RESULTS: Use of the Scopette (Birchwood Laboratories, Eden Prairie, Minn.) reduction technique to reduce the prolapse in a linear orientation during multichannel urodynamics revealed a 56% incidence of low-pressure urethra and an overall genuine stress urinary incontinence of 83% in patients with massive pelvic organ prolapse but without clinical urinary incontinence. CONCLUSIONS: There may be an increased indication for sling urethropexy in patients with massive prolapse.     

Abdominopelvic CT scan findings after surgery for ovarian cancer

AIMS: To evaluate abdomino-pelvic changes in patients who had total abdominal hysterectomy (TAH) and bilateral salpingo-oophorectomy (BSO) for stage I ovarian cancer. METHOD: The postoperative computed tomographic (CT) scans of 23 patients who had undergone TAH and BSO for stage I ovarian tumours between 3 and 14 weeks previously were assessed, providing there had been no treatment with chemotherapy or radiotherapy and that each patient had normal tumour marker (CA125) levels after surgery. After the CT scan patients were followed up and had no clinical or biochemical (CA125) evidence of relapse for a median of 27 months (range 11 to 78 months). The following sites were assessed by two observers: the vaginal vault, round ligaments, bladder, rectum, perirectal fat, pelvic sidewalls, omentum, surgical scar and abdominal wall. Any abnormality was recorded, with re-evaluation on follow-up CT scans in ten patients (between three and 17 months). RESULTS: The following abnormalities were seen: (1) Thickened round ligaments (n=12) with bulbous masses at the surgically transected ends (n=7). This was bilateral in eight patients. (2) Vaginal vault thickening (n=11) either uniform (n=6) or bulbous bilaterally (n=2) or unilaterally (n=3). (3) Subtle omental bed stranding or nodularity (n=11). (4) Peritoneal thickening underlying the scar (n=4). (5) Asymmetrical rectus abdominis muscles (n=3) adjacent to the surgical scar or thickened scar tissue in the anterior abdominal wall (n=4). No significant bladder, rectal, perirectal or nodal abnormalities were found. CONCLUSION: Pseudotumours at the transected ends of the round ligaments, or uniformly swollen round ligaments, may be identified in patients who have had TAH and BSO, as may vaginal vault thickening. Other changes which may be observed in the abdomen and pelvis are peritoneal thickening adjacent to the scar and omental bed stranding.     

Influence of age and prostate-specific antigen on the chance of curable prostate cancer among men with nonpalpable disease

OBJECTIVE: Our aim was to retrospectively analyze the Mayo Clinic experience of descending perineum syndrome from 1987-1997. METHODS: Clinical records were abstracted for demographic features, risk factors, results of anorectal and defecation tests, and a mailed questionnaire evaluated outcome and current symptoms. RESULTS: All results are mean +/- SD. Clinically, 39 patients (38 women, one man), mean age 53+/-14 yr, presented with constipation (97%), incomplete rectal evacuation (92%), excessive straining (97%), digital rectal evacuation (38%), and fecal incontinence (15%). Laboratory tests showed anal sphincter resting pressure was 54+/-26 mm Hg, and squeeze pressure was 96+/-35 mm Hg; expulsion from the rectum of a 50-ml balloon required > 200 g added weight in 27%; perineal descent was 4.4+/-1 cm (normal < 4 cm) by scintigraphy. Scintigraphic evacuation, rectoanal angle change during defecation, and perineal descent were abnormal in 23%, 57%, and 78% of the patients, respectively. Associated features included female gender (96%), multiparity with vaginal delivery (55%), hysterectomy or cystocele/rectocele repair (74%). On follow-up, 64% responded; 17 of these 25 responders underwent pelvic floor retraining. At 2-yr median follow-up (range, 1-6 yr), 12 still experienced constipation or excessive straining; their perineal descent was greater than in patients who responded to retraining (p = 0.005). CONCLUSIONS: Descending perineum syndrome is identifiable by clinical history and examination, and the most prevalent abnormality on testing is perineal descent > 4 cm; rectal balloon expulsion is an insensitive screening test for descending perineum syndrome. Pelvic floor retraining is a suboptimal treatment for this chronic disorder of rectal evacuation; the extent of perineal descent appears to be a useful predictor of response to retraining.     

Urinary fistulas: vaginal repair using a labial fat pad

A technique is recommended to repair urinary fistulas vaginally using a pedicle of labial fat to separate the urothelial and vaginal layers. The technique was used in 6 patients with vesicovaginal and 4 patients with urethrovaginal fistulas. Anatomic results were successful in all cases and stress incontinence was cured in all patients who had this coexistent condition.     

Results of transperineal levator-plasty in treatment of symptomatic rectocele

A rectocele is a herniation of the anterior rectal wall through the rectovaginal septum into the vagina. The most important risk factors are a previous hysterectomy, obstetic injuries and the descending perineum syndrome. In some patients the rectocele becomes symptomatical because of defecation disorders. The patients have to give manual vaginal or perineal help during defecation. Radiological parameters like the size of the rectocele or retention of barium only have limited value for the clinical evaluation. In a high percentage we find simultaneous symptoms of fecal incontinence. Transperineal anterior levatorplasty makes it possible to close the rectocele. This procedure has a positive influence on defecation and continence. In a prospective study we performed anterior levatorplasty in 35 female patients having a rectocele in combination with rectal outlet obstruction. Subjective improvement of the defecation disorder was found in 74%. Only 1 patient complained of deterioration. No patient needed manual vaginal help postoperatively. Patients who needed perineal help preoperatively had worse results. Patients who did not need any manual help preoperatively nevertheless reported an improvement postoperatively. Fifteen of 20 patients, who suffered from fecal incontinence preoperatively, reported a better continence postoperatively (75%). Even in patients with incontinence the anterior levatorplasty is a good method for rectocele repair, as it improves rectal emptying and simultaneously provides therapy for fecal incontinence.     

Laparoscopy-assisted and -prepared hysterectomy. A series of 80 cases

OBJECTIVE: Our objective was to determine the interest of laparoscopic assisted vaginal hysterectomy. STUDY DESIGN: Between January 1991 to december 1994, 80 patients had laparoscopically assisted vaginal hysterectomy. We reviewed with particular emphasis characteristic indications, complications. RESULTS: Eighty were performed as laparoscopically assisted vaginal hysterectomy. 14 patients (17.5%) had laparotomy conversion; because of size of uterus in 3 cases, suspected ovarian tumor in 3 cases. Pelvic adherences in 4 cases, urinary tract injuries in 1 case, hypercapnia in 1 case, hemorrhage in 2 cases. 9 patients experienced febrile morbidity and 1 urinary infection. 1 patient received 2 units of packed red blood cells. The hospital stay was 5 days for laparoscopically assisted vaginal hysterectomy versus 5.9 for laparotomic hysterectomy. CONCLUSION: Laparoscopically assisted vaginal hysterectomy offers a technique to convert certain abdominal hysterectomies into vaginal hysterectomies with a 17.5% laparoconversion rate.     

Characterization of cosmids and telomeres in cytogenetic preparations by 3D confocal fluorescence

OBJECTIVE: To assess a new laparoscopic technique of paravaginal repair, adapted from a classic laparotomy procedure, for genuine stress urinary incontinence. STUDY DESIGN: From January 1992 to July 1997, 28 patients in a consecutive, prospective clinical case study were subjected to laparoscopic paravaginal repair. No concomitant surgery was performed. A clinical diagnosis of genuine stress urinary incontinence was documented by cystometry following a positive cough stress test. When indicated, a multichannel urodynamics study was performed. RESULTS: In 16 patients (57%) of 28, the right pelvic side was affected, and in 43% fascia damage was identified and repaired bilaterally. The average operative time was 2 hours, 45 minutes; average blood loss was 1.2 g hemoglobin. No intraoperative, immediate postoperative, delayed postoperative or anesthesia-associated complications were observed. Patients were discharged from the surgical units in an average of 5 hours, 15 minutes. There was no postoperative hospital readmission. CONCLUSION: Laparoscopic paravaginal repair is simple and safe and has a 93% cure rate. It is an attractive alternative to laparotomy.     

Video imaging--a computer facilitated approach to communication and planning in orthognathic surgery

The role of connective tissue in the aetiology of female stress incontinence has been investigated. Collagen content and extractability as well as estrogen receptor concentration in vesico-vaginal fascia were measured after small tissue biopsies had been obtained during vaginal repair surgery in cases of urinary incontinence. The mean concentration of estrogen receptor in vesico-vaginal fascia among incontinent women was 49.4 +/- 14.8 fmol/mg of protein as compared to 29.6 +/- 13.1 in continent control group (P < 0.03; t-test). The mean hydroxyproline concentration in vesico-vaginal fascia of incontinent women was 13.8 +/- 2.6 micrograms/mg wet weight, whereas in the control group it was significantly higher 20.6 +/- 2.4 (P < 0.001). The role of connective tissue components in the aetiology of female stress incontinence is discussed.     

Guidelines to determine the route of oophorectomy with hysterectomy

OBJECTIVES: Our purpose was to determine whether there is adequate visibility and access for transvaginal oophorectomy in most patients and the success rate of the transvaginal approach. The final goal was to establish objective guidelines for choosing the route of oophorectomy with hysterectomy. STUDY DESIGN: Patients underwent laparoscopy-assisted vaginal hysterectomy (n = 91) or vaginal hysterectomy (n = 875). Ovarian removal, either unilateral (n = 97) or bilateral (n = 187), was carried out for clinical or prophylactic reasons. The accessibility of the ovaries for transvaginal removal was assessed by stretching the infundibulopelvic ligament and grading the position of the ovaries from 0 (no descent) to III (descent past the hymenal ring with traction). RESULTS: In 158 patients transvaginal bilateral oophorectomy was performed without laparoscopic assistance. In another 29 patients bilateral transvaginal oophorectomy was performed with laparoscopy-assisted vaginal hysterectomy, and prophylactic bilateral oophorectomy by the transvaginal route was successful in all but 1 of 143 patients with ovaries of grade I or higher. In 20 patients laparoscopic lysis of adhesions was necessary to permit transvaginal oophorectomy. Ninety-seven patients underwent transvaginal unilateral oophorectomy, 74 with conventional vaginal hysterectomy and 23 with laparoscopy-assisted vaginal hysterectomy. Among the patients not having oophorectomy, all ovaries had sufficient mobility to have been removed transvaginally. CONCLUSION: Good surgical practice dictates that visibility and accessibility be the primary criteria for selecting the route of oophorectomy with hysterectomy. In most patients the ovaries are visible and accessible to transvaginal removal.