Fistula reno-apendicular como presentación inusual de pielonefritis xantogranulomatosa: reporte de caso / Reno-appendicular fistulus as an unusual presentation of xanthogranulomatous pyelonephritis: a case report

Resumen La fístula uro-entérica es una comunicación patológica entre la vía urinaria y digestiva. El compromiso del apéndice es infrecuente y son pocos los casos de fístulas reno-apendiculares en la literatura. Se presenta el caso de un paciente con clínica de fiebre, dolor lumbar e hidronefrosis derecha severa secundaria a cálculo coraliforme en la tomografía de vías urinarias. Manejado inicialmente con antibióticos y nefrostomía bajo fluoroscopia, posteriormente suspendida por paso de contraste al intestino. Se realizó una tomografía contrastada que reportó fístula del riñón al intestino. Se llevó a nefrectomía y se encontró fistula hacía el apéndice, por lo cual se realizó apendicectomía concomitante con mejoría clínica evidente. La patología reportó pielonefritis xantogranulomatosa y apendicitis secundaria. La fístula reno-apendicular posee una clínica inespecífica, la tomografía contrastada es una herramienta diagnóstica y la mayoría se detectan como un hallazgo intraoperatorio. El tratamiento usualmente es quirúrgico, con nefrectomía y reparación del segmento intestinal. MÉD. UIS.2021;34(3): 79-84.

Abstract Uro-enteric fistula is a pathological communication between the urinary and digestive tract. Compromise of the appendix is infrequent and few cases of reno-appendicular fistulas have been described in the literature. The case of patient with symptoms of fever, low back pain and severe right hydronephrosis secondary to staghorn calculus on urinary tract tomography is presented. Initially managed with antibiotics and nephrostomy under fluoroscopy, subsequently suspended by passing contrast to the intestine. A contrasted tomography was performed which reported a fistula from the kidney to the intestine. A nephrectomy was carried out and a fistula was found to the appendix, for which a concomitant appendectomy was performed with evident clinical improvement. The pathology reported xanthogranulomatous pyelonephritis and secondary appendicitis. Reno-appendicular fistula has nonspecific symptoms, contrasted tomography is a diagnostic tool and most are detected as an intraoperative finding. Treatment is usually surgical, with nephrectomy and intestinal segment repair. MÉD.UIS.2021;34(3): 79-84.

Urorectal fistula repair using different approaches: operative results and quality of life issues

ABSTRACT Purpose: To evaluate efficacy of urorectal fistula (URF) repair using different approaches and the clinical factor determinant of success, and also the morbidity associated to the procedure and health-related quality of life (HRQoL) in male survivors of pelvic malignancies. Material and Methods: Retrospective evaluation of 39 patients with URF primarily intervened in three institutions using different surgical approaches. Success was defined as effective fistula closure. Variables evaluated included demographics, previous treatments, surgical approach, ancillary surgeries, complications and HRQoL by using a standardized non-validated specific questionnaire. Median follow-up from surgery to interview was 55 months (interquartile range 49, range 4-112). Factors determinant of success were investigated using logistic regression. Safety of the procedure was evaluated by Clavien-Dindo scale. Deterioration of continence and erectile function and other HRQoL issues were evaluated. Results: Prostate cancer treatment was the predominant etiology. The success rate for fistula repair was 89.5%. The surgical approach was not related to failed repair (p=0.35) or complications (p=0.29). Factors associated with failure were complications (p=0.025), radiotherapy (p=0.03), fistula location (p=0.04) and fistula size (p=0.007). Multivariate analysis revealed fistula size was the only independent determinant of failure (OR 6.904, 1.01-47.75). Complications occurred in 46.2% and severe complications in 12.8%. The mortality related to the procedure was 2.6%. Urinary incontinence was present before repair in 26.3% and erectile dysfunction in 89.5%. Fistula repair caused de novo urinary incontinence in 7.9% and deterioration of erectile status in 44.7%. Globally 79% were satisfied after repair and only 7.9% rated HRQoL as unhappy. Trans-sphincteric approach was related to less deterioration of erectile function (p=0.003), and higher perceived satisfaction in QoL (p=0.04). Conclusions: The surgical approach elected to correct URF is not determinant of success nor of complications. Fistula size appears as independent determinant for failure. Transsphincteric approach could be advantageous over other procedures regarding HRQoL issues.

Quiluria renal izquierda idiopática asociada al embarazo / Idiopathic left renal quiluria associated with pregnancy

Introducción: La eliminación de orina que con tiene grandes cantidades de material quiloso y adquiere un aspecto lechoso se conoce con el nombre de quiluria. Salvo en las regiones donde es endémica, la filariasis linfática, principal etiología, se considera en general como un trastorno raro. Objetivo: Describir un caso de quiluria asociada al embarazo. Caso clínico: Paciente femenina de 32 años de edad, con múltiples ingresos en el Servicio de Nefrología del Hospital Celia Sánchez Manduley desde el año 2007 por presentar orinas de color blanquecino, cuadro que comenzó con el primer embarazo, el síntoma desapareció y luego reapareció con el segundo embarazo, primero de forma intermitente y después, adquirió carácter permanente, con hematuria, proteinuria, edemas y otras alteraciones clínicas y bioquímicas. Conclusiones: La nefrectomía está indicada en la quiluria, cuando pone en riesgo la vida del paciente o afecta su calidad de vida, si no se tienen otras alternativas terapéuticas(AU)

Introduction: The elimination of urine containing large amounts of chyllous material and acquiring a milky appearance is known as quiluria. Except in regions where it is endemic, lymphatic filariasis, the main etiology, is generally considered to be a rare disorder. Objective: To describe a case of chyluria associated with pregnancy. Clinical case: 32-year-old female patient with multiple admissions to the nephrology service at Hospital Celia Sánchez Manduley since 2007 for presenting whitish urine, a clinical picture that began with the first pregnancy. The symptom disappeared, then reappeared with the second pregnancy, first intermittently and then became permanent with hematuria, proteinuria, edema and other clinical and biochemical alterations. Conclusions: Nephrectomy is indicated in chyluria when it puts the patient's life at risk and affects the quality of life, if there are no other therapeutic alternatives(AU)

Prostatectomía convencional versus resección endoscópica de próstata monopolar en pacientes con Hiperplasia Prostática: un estudio de corte retrospectivo / Conventional prostatectomy vs. endoscopic resection of monopolar prostate in patients with Prostatic Hyperplasia: a retrospective study

La resolución quirúrgica de la hiperplasia prostática benigna se modifca conforme el acceso a las diferentes tecnologías en salud. Las complicaciones del abordaje endoscópico versus el convencional son similares. El Objetivo de este estudio fue analizar retrospectivamente los resultados de la cirugía convencional y la resección endoscópica monopolar de la hiperplasia de próstata en un hospital terciario del Ecuador. Pacientes y Métodos: Estudio retrospectivo, analítico. Fueron incluidos en el estudio 232 pacientes con diagnóstico histopatológico de hiperplasia prostática benigna atendidos en el servicio de urología del hospital Luis Vernaza en el período enero 2015 ­ diciembre 2016. Los pacientes fueron divididos en 2 subgrupos de acuerdo con el abordaje terapéutico ­ quirúrgico: prostatectomía convencional (n = 120) y resección endoscópica (n = 112). Resultados: Mediante estadística inferencial se comprobó una relación estadísticamente signifcativa entre el tipo de abordaje terapéutico con el tiempo quirúrgico (p= <0.001) y con el índice de sangrado (p= <0.001) y entre la edad y el tiempo quirúrgico (p= <0.001). Las complicaciones más importantes fueron: hemorragia inmediata (n=9) e infecciones de la herida (n=10) para la cirugía convencional y hemorragia inmediata (n=2) y sepsis (n=3) para la cirugía endoscópica. La media de tiempo quirúrgico fue 103.03 min y 75.14 min respectivamente. Conclusión: El desarrollo tecnológico ha traído la certeza de que la cirugía endoscópica tiene menores complicaciones, disminuye los tiempos quirúrgicos. Siendo una opción por considerar frente a la cirugía tradicional para la hiperplasia de próstata

Surgical resolution of benign prostatic hyperplasia is modifed as access to different health technologies. Complications of endoscopic versus conventional approach are similar. The objective of this study was to retrospectively analyze the results of conventional surgery and monopolistic endoscopic resection of prostate hyperplasia in a tertiary hospital in Ecuador. Patients and Methods: Retrospective, analytical study. 232 patients diagnosed with benign prostatic hyperplasia were included in the study in the urology service of the Luis Vernaza hospital in the period January 2015 ­ December 2016. Patients were divided into 2 subgroups according to the therapeutic­surgical approach: conventional prostatectomy (n.120) and endoscopic resection (n. 112). Results: By inferential statistics, a statistically signifcant relationship was found between the type of therapeutic approach with the surgical time (p. 0.001) and with the bleeding index (p. 0.001) and between age and surgical time (p. 0.001). The most important complications were: immediate bleeding (n-9) and wound infections (no. 10) for conventional surgery and immediate bleeding (n-2) and sepsis (no. 3) for endoscopic surgery. The surgical mean time was 103.03 min and 75.14 min respectively. Conclusions: Technological development has brought the certainty that endoscopic surgery has fewer complications, decreases surgical times. Being an option to consider against traditional prostate hyperplasia surgery

Modified Snodgrass technique for hypospadias / 中华男科学杂志

Objective@#To investigate the clinical effect of modified Snodgrass surgical technique in the treatment of hypospadias.@*METHODS@#We retrospectively analyzed the clinical data about 212 cases of hypospadias treated by urethroplasty from January 2008 to October 2016, 94 with the modified Snodgrass technique, namely with a silk line in addition to the urethral suture to make easier postoperative removal of the suture (group A), and the other 118 with the conventional Snodgrass technique (group B). The urethral suture was removed at 10 days after surgery for the patients in group A. We compared the success rate of surgery and incidence of postoperative complications between the two groups.@*RESULTS@#Compared with group B, group A showed a significantly higher success rate of surgery (81.36% vs 91.49%, P 0.05).@*CONCLUSIONS@#The modified Snodgrass technique can improve the success rate of surgery and reduce the incidence rates of incisional infection and urinary fistula, which deserves wide clinical application.

Can a graft be placed over a flap in complex hypospadias surgery? An experimental study in rabbits

ABSTRACT Purpose: To develop a rabbit experimental study to test the hypothesis that surgical repair of hypospadias with severe ventral curvatures might be completed in one stage, if a graft, such as buccal mucosa, could be placed over the tunica vaginalis flap used in corporoplasty for ventral lengthening, with the addition of an onlay preputial island flap to complete the urethroplasty. Materials and methods: The experimental procedure with rabbits included a tunica vaginalis flap for reconstruction of the corpora after corporotomy, simulating a ventral lengthening operation. A buccal mucosa graft was placed directly on top of the flap, and the urethroplasty was completed with an onlay preputial island flap. Eight rabbits were divided into 4 groups, sacrificed at 2, 4, 8 and 12 weeks postoperatively, and submitted to histological evaluation. Results: We observed a large number of complications, such as fistula (75%), urinary retention (50%) and stenosis (50%). There were two deaths related to the procedure. Histological evaluation demonstrated a severe and persistent inflammatory reaction. No viable tunica vaginalis or buccal mucosa was identified. Conclusions: In this animal model, the association of a buccal mucosa graft over the tunica vaginalis flap was not successful, and resulted in complete loss of both tissues.

Laparoscopically assisted anorectoplasty and the use of the bipolar device to seal the rectal urinary fistula / Anorretoplastia laparoscópica e a utilização do selamento bipolar da fistula retourinária

ABSTRACT Background: The anorectal anomalies consist in a complex group of birth defects. Laparoscopic-assisted anorectoplasty improved visualization of the rectal fistula and the ability to place the pull-through segment within the elevator muscle complex with minimal dissection. There is no consensus on how the fistula should be managed. Aim: To evaluate the laparoscopic-assisted anorectoplasty and the treatment of the rectal urinary fistula by a bipolar sealing device. Method: It was performed according to the original description by Georgeson1. Was used 10 mm infraumbilical access portal for 30º optics. The pneumoperitoneum was established with pressure 8-10 cm H2O. Two additional trocars of 5 mm were placed on the right and left of the umbilicus. The dissection started on peritoneal reflection using Ligasure(r). With the reduction in the diameter of the distal rectum was identified the fistula to the urinary tract. The location of the new anus was defined by the location of the external anal sphincter muscle complex, using electro muscle stimulator externally. Finally, it was made an anastomosis between the rectum and the new location of the anus. A Foley urethral probe was left for seven days. Results: Seven males were operated, six with rectoprostatic and one with rectovesical fistula. The follow-up period ranged from one to four years. The last two patients operated underwent bipolar sealing of the fistula between the rectum and urethra without sutures or surgical ligation. No evidence of urethral leaks was identified. Conclusion: There are benefits of the laparoscopic-assisted anorectoplasty for the treatment of anorectal anomaly. The use of a bipolar energy source that seals the rectal urinary fistula has provided a significant decrease in the operating time and made the procedure be more elegant.

RESUMO Racional: As anomalias anorretais consistem de um grupo complexo de defeitos congênitos. A anorretoplastia laparoscópica permite melhor visualização da fístula retourinária e propicia o posicionamento do reto abaixado dentro do complexo muscular do elevador do ânus com mínima dissecção. Não há consenso na literatura sobre o melhor tratamento dessa fístula. Objetivo: Avaliar a anorretoplastia laparoscópica e o selamento bipolar da fístula retourinária. Método: Ela foi realizada de acordo com a descrição original de Georgeson1. Utilizou-se o acesso infraumbilical com portal de 10 mm para a ótica de 30º. O pneumoperitônio foi estabelecido com pressão de 8-10 cm de H2O. Dois trocárteres adicionais de 5 mm foram colocados à direita e à esquerda da cicatriz umbilical. A dissecção foi iniciada na reflexão peritoneal usando Ligasure(r). Com a redução do calibre do reto distalmente, foi identificada a fístula para a o trato urinário. O local do novo ânus foi definido por meio da localização do complexo muscular do esfíncter anal externo, utilizando-se estimulador eletro muscular externamente. Por fim, foi confeccionada uma anastomose entre o reto e o novo local do ânus. Uma sonda uretral de Foley foi deixada durante sete dias. Resultados: Sete meninos foram operados, seis com fístula retoprostática e um retovesical. O período de seguimento variou de um a quatro anos. Os dois últimos pacientes operados foram submetidos ao selamento bipolar da fístula entre o reto e a uretra, sem suturas ou ligadura cirúrgica com pontos. No seguimento em longo prazo não houve evidências de fístulas urinárias. Conclusão: Há benefícios da anorretoplastia laparoscópica para o tratamento de anomalia anorretal. O uso de uma fonte de energia bipolar que promova o selamento da fístula retourinária propiciou redução significativa do tempo cirúrgico e tornou o procedimento mais elegante.

Inlaid labial versus bladder mucosal graft repair for complex urethral skin fistula / 中华男科学杂志

<p><b>Objective</b>To compare the effect of inlaid labial mucosal graft repair (LMGR) with that of bladder mucosal graft repair (BMGR) in the treatment of complex urethral skin fistula after hypospadias repair.</p><p><b>METHODS</b>This study included 55 cases of complex urethral skin fistula following hypospadias repair. We randomly assigned them to receive inlaid LMGR (n=36) or BMGR (n=19). After surgery, we compared the incidence of complications and recurrence rate of urinary fistula between the two groups of patients.</p><p><b>RESULTS</b>The success rates of operation were 91.7% and 84.2% in the LMGR and BMGR groups, respectively, and the penile appearance was desirable in both groups. Postoperative complications included 2 cases of urinary fistula and 1 case of urethral stricture in each group. There were no statistically significant differences between the two groups in the success rate of operation (P>0.05) or the incidence rate of postoperative complications (P>0.05).</p><p><b>CONCLUSIONS</b>Both inlaid LMGR and BMGR yield satisfactory results in the treatment of complex urethral skin fistula. However, LMGR involves less injury in mucosa collection and is easier to perform and therefore deserves more clinical attention.</p>

Late complication of a renal calculus: fistulisation to the psoas muscle, skin and bronchi

ABSTRACTKidney disease presenting with cutaneous fistula is a rare condition. We present a case of a 90-year-old woman with dementia who had no prior urological problems and had a cutaneous fistula in the left lumbar region. A fistulogram and computer tomography examination revealed a large staghorn calculus with signs of xanthogranulomatous pyelonephritis in the left kidney and renal fistulisation to the psoas muscle, skin and bronchi. To our knowledge this is the first report in the literature of coexisting renal fistulisation to the psoas major muscle, skin and bronchi. This report illustrates how computed tomography in combination with fistulography can resolve the diagnostic dilemma that pertains to the complex spread of the disease in cases involving nephrocutaneous fistula. Furthermore, the report shows how a renal calculus, even asymptomatic, can cause a serious medical condition, and highlights the importance of early medical intervention.

Nephrocutaneous fistula as the initial manifestation of asymptomatic nephrolithiasis: a call for radical management

Renal stones are a common affliction presenting in an acute setting. We report a case of asymptomatic renal stone in an elderly gentleman presenting initially as a discharging lumbar sinus managed by subcapsular nephrectomy and radical excision of the fistula tract. Nephrocutaneous fistula is most commonly associated with tuberculosis, xanthogranulomatous pyelonephritis, and rarely with complicated calyceal stones, and its occurrence with asymptomatic pelvic stones is rare. We present the points in favor of radical open surgery in the management of such patients

Fistules urogenitales: etude epidemiologique et clinique dans deux hopitaux generaux du district de la Tshopo; Kisangani-RDC

Introduction : Les fistules vesico-vaginales et recto-vaginales; veritable humiliation pour la femme; constituent un probleme majeur de Sante Publique de par sa forte prevalence principalement pour les pays pauvres (Afrique sub-saharienne et Asie du Sud-est). Dans cette etude; notre objectif a ete d'evaluer l'ampleur des fistules genito-urinaire et rectales a Kisangani et ses environs et d'en ressortir les causes ainsi que les caracteristiques des fistuleuses. Materiel et methodes : Une etude descriptive transversale retrospective basee sur l'analyse documentaire a ete menee dans les Hopitaux Generaux de Reference de Makiso-Kisangani (a Kisangani) et de Banalia (a Banalia) du 29 Aout au 08 Novembre 2013; apres sensibilisation des femmes par l'UNFPA. Resultats : La frequence des fistules genitourinaires et rectales a ete de 0;005 dans la ville de Kisangani et de 0;012 a Banalia soit une frequence globale de 0;008 soit 8 cas pour 1000 femmes survenant chez les femmes agees de 20 a 34 ans(45;61) avec des extremes d'age de 5 a 75 ans. 54;38 d'entr'elles etaient Mariees; 63;16 menageres; 80;71 de bas niveau d'instruction. Les femmes habitant les milieux peripheriques ou eloignes des centres hospitaliers ont ete les plus nombreuses soit 69;6 pour Kisangani et 67;6 pour Banalia. Les fistules souvent obstetricales (85;91) lors des accouchements a domiciles (50;8) etaient le plus souvent de type simple (57;89); a leur premiere reparation (52;63) et evoluant depuis de 2 mois a 55 ans. Les fistules traumatiques dues au viol a represente 1 ;75. La prise en charge a ete chirurgicale essentiellement basse dans 84;21 de cas avec un taux de succes de 82;46. Conclusion : La lutte contre les accouchements a domicile et les conflits armes et l'organisation des campagnes de prise en charge des fistuleuses constituent des strategies majeures de riposte contre les fistules vaginale

Three different strategies of urine drainage following hypospadias surgery: clinical nursing and observation / 中华男科学杂志

<p><b>OBJECTIVE</b>To study 3 different strategies of urine drainage following hypospadias urethroplasty, the clinical nursing in their application, and their effects.</p><p><b>METHODS</b>We retrospectively analyzed the clinical data of 595 cases of hypospadias treated by urethroplasty. After surgery, 133 of the patients underwent urine drainage by suprapubic cystostomy (group A), 202 by urethral stent- tube indwelling (group B), and 260 by early initiative micturition with the urethral stent-tube (group C). All the patients received routine postoperative nursing care required for hypospadias repair.</p><p><b>RESULTS</b>Operations were successfully completed in all the cases. Group C showed a remarkably shorter hospital stay and lower incidence rates of urinary fistula and urethral stricture than groups A and B (P<0.05), but there were no significant differences in the three indexes between A and B (P<0.05).</p><p><b>CONCLUSION</b>For urine drainage following hypospadias repair, early initiative micturition with the urethral stent-tube can significantly reduce postoperative complications, decrease difficulties and workload of nursing care, and shorten the hospital stay of the patient.</p>

Postoperative Ureteral Leak Treated Using a Silicone-Covered Nitinol Stent / 대한배뇨장애요실금학회지

Ureteral fistula is a serious complication of abdomino-pelvic surgeries, often resulting in poor outcomes owing to lack of proper treatment. We report the case of a 49-year-old woman who underwent placement of a silicone-covered ureteral occlusion stent in her right ureter for the management of ureteral leakage after pelvic surgery. A ureterogram obtained 18 months following the stent placement confirmed that there was no stent migration or additional urine leakage. We propose that the silicone-covered ureteral occlusion stent is practical, fast, and safe for the management of ureteral leakage.

Identifying unrecognized collecting system entry and the integrity of repair during open partial nephrectomy: comparison of two techniques

Purpose To compare retrograde dye injection through an externalized ureteral catheter with direct needle injection of dye into proximal ureter for identification of unrecognized collecting system disruption and integrity of subsequent repair during open partial nephrectomy. Materials and Methods We retrospectively reviewed the records of 259 consecutive patients who underwent open partial nephrectomy. Externalized ureteral catheters were placed preoperatively in 110 patients (Group 1); needle injection of methylene blue directly into proximal ureter was used in 120 patients (Group 2). No assessment of the collecting system was performed in 29 patients (Group 3). We compared intraoperative parameters, tumor characteristics, collecting system entry and incidence of urine leaks among the three groups. Results The mean tumor diameter was 3.1cm in Group 1, 3.6cm in Group 2, and 3.8 cm in Group 3 (p = 0.04); mean EBL 320cc, 351 cc and 376cc (p = 0.5); mean operative time 193.5 minutes, 221 minutes and 290 minutes (p < 0.001). Collecting system entry was recognized in 63%, 76% and 38% of cases in Groups 1, 2 and 3 respectively. (p = 0.07). Postoperative urine leaks requiring some form of management occurred in 11 patients from group 1 and 6 from group 2. (p = 0.2). No patient in Group 3 developed a urinary leak. Conclusions Identification of unrecognized collecting system disruption as well as postoperative urine leak rate in patients undergoing partial nephrectomy were not influenced by the intraoperative technique of identifying unrecognized collecting system entry. Postoperative urine leaks are uncommon despite recognized collecting system disruption in the majority of patients. .

Fístula nefrobronquial en paciente pediátrico: caso clínico / Nephrobronchial fistula in pediatric patient. Case report

La fístula nefrobronquial es una complicación infrecuente de las infecciones renales, que ocurre habitualmente en pacientes adultos con pielonefritis xantogranulomatosa. Comunicamos el caso de una paciente de 12 años con antecedentes de mielomeningocele operado e infección urinaria recurrente, quien consultó con historia de cuatro semanas de fiebre, tos y disnea. Ingresó en shock séptico y presentó inundación de la vía aérea por pus, que le ocasionó episodio de asistolia. Mediante tomografía computarizada de abdomen, se diagnosticó extensa colección perirrenal izquierda. Se efectuó un drenaje percutáneo, que dio salida a pus y aire. TAC de tórax y abdomen mostró fístula transdiafragmática entre la base pulmonar izquierda y colección intraabdominal. Se realizó nefrectomía total. La paciente mostró mejoría progresiva poscirugía y regresión total de la sintomatología. Este infrecuente caso clínico en niños ilustra la importancia del diagnóstico precoz de infección urinaria en pacientes con patologías asociadas y de presentar un elevado índice de sospecha ante una complicación potencialmente letal

Nephrobronchial fistula is a rare complication of kidney infections, usually occurring in adult patients with xanthogranulomatous pyelonephritis and very occasionally in children. We reported a 12-year-old girl, with a history of myelomeningocele and recurrent urinary tract infection, who presented with a four-week fever, cough and dyspnea, developing septic shock and presenting flood of airway by pus which caused cardiac arrest. A diagnosis of left perirenal extensive collection was established by abdominal computed tomography (CT). The patient first had antibiotic therapy and percutaneous drainage was performed draining pus and air. Thoracic and abdominal CT scan was performed corroborating transdiaphragmatic fistula. Total nephrectomy was performed. The patient showed gradual improvement after surgery and total regression of symptoms. Pathologic examination concluded chronic pyelonephritis. This case report illustrates a rare complication in children, the importance of early diagnosis of urinary tract infection in patients with comorbidities and of exhibiting a high index of suspicion to a potentially lethal complication.