Impact of the associated anorectal malformation on the outcome of spinal dysraphism after untethering surgery

A prospective cohort study of assisted bladder emptying following primary cloacal repair: The Children's National experience

INTRODUCTION/BACKGROUND

Although the combination of bladder dysfunction and upper tract anomalies puts patient with cloaca at risk for renal disease, the rarity of this condition makes it difficult to study empirically. As a high-volume center, we uniquely capture bladder function outcomes following our growing number of cloacal repairs.

OBJECTIVE

1) Describe the rates of incomplete bladder emptying following primary cloacal repair (at 2-3 months after repair and last follow up), and 2) identify clinical factors associated with assisted bladder emptying.

STUDY DESIGN

We performed a prospective cohort study of patients undergoing primary cloaca repair by our Children's National Colorectal Center team between 2020 and 2021. The primary outcome was assisted bladder emptying at 2-3 months postoperatively and last visit. Covariables included preoperative characteristics (cloacagram measurements), ARM complexity (moderate = common channel [CC] <3-cm, severe = CC ≥ 3-cm), vesicoureteral reflux (VUR) status, sacral ratio (good ≥0.7, intermediate 0.7-0.4, poor ≤0.4), spinal cord status, means of preoperative bladder emptying, and operative details (age at repair, repair type, & concomitant laparotomy).

RESULTS

Eighteen participants were eligible. A majority had moderate cloaca (78%), VUR (67%), spinal cord abnormalities (89%), and good sacral ratios (56%). Preoperatively, 10 patients were diapered for urine and 8 had assisted bladder emptying. Surgical repairs were performed at a median age of 8 months (range 4-46). Nine (50%) patients underwent urogenital separation (UGS), eight (44%) total urogenital mobilization, and 1 (6%) perineal sparing posterior sagittal anorectoplasty with introitoplasty. Exploratory laparotomy was performed in 7 (39%) patients. At 2-3 months, 7 patients were voiding and 11 required assisted bladder emptying. Median length of long-term follow up was 12 months (range 5-25), and 8 patients were voiding and 10 required assisted bladder emptying. Postoperative need for assisted bladder emptying was significantly associated with assisted bladder emptying preoperatively, a shorter urethra and increasing common channel length, UGS and exploratory laparotomy. Spinal cord imaging findings were not associated.

DISCUSSION

Bladder emptying following cloaca repair is likely a result of congenital function and surgical effects. Indeed, increasingly cloaca complexity requiring UGS and laparotomy was associated with both pre- and post-operative assisted bladder emptying. The lack of association with spinal cord imaging may reflect a divergence between anatomy and function.

CONCLUSION

Approximately half of patients required assisted bladder emptying in this study. Associated factors included urethral and common channel length, the need for assisted bladder emptying preoperatively, the type of surgical approach and additional laparotomy. Being diapered with seemingly normal voiding prior to surgery did not guarantee normal bladder function postoperatively.

Multi-Institutional Review From the Pediatric Colorectal and Pelvic Learning Consortium of Minor Spinal Cord Dysraphism in the Setting of Anorectal Malformations: Diagnosis, Treatment, and Outcomes

BACKGROUND/RATIONALE

Anorectal malformations (ARM) are associated with congenital anomalies of the spine, but the impact of a minor spinal cord dysraphism (mSCD) on fecal continence in the setting of ARM remains unclear.

MATERIALS/METHODS

A retrospective review was performed utilizing data from the Pediatric Colorectal and Pelvic Learning Consortium (PCPLC) registry. The patient cohort was reviewed for ARM type, mSCD screening/incidence/neurosurgical intervention and age-based BMP utilization.

RESULTS

987 patients with ARM were categorized into mild (38%), moderate (32%) or complex (19%). 694 (70%) had normal spinal (NS) status. 271 (27.5%) patients had mSCD. MRI alone (49%) was the most common screening test for mSCD. US screening had a positive predictive value of 86.3% and a negative predictive value of 67.1%. Surgical intervention rates for mSCD ranged between 13% and 77% at a median age of 0.6-5.2 years. 726 (73.6%) patients were prescribed BMP (74.4% NS, 77.5% mSCD). Laxatives were most utilized BMP in all groups <5yo. ≥5yo, enema utilization increased with ARM complexity independent of spine status (with or without neurosurgical intervention). Neurosurgical intervention did not affect BMP utilization at any age or with any ARM when mSCD was identified.

CONCLUSIONS

MSCD influence on bowel function in the setting ARM remains unclear. No significant impact of mSCD was noted on ARM patient bowel management program utilization. Variability exists within PCPLC site with screening and intervention for mSCD in patients with ARM. Future studies with standardized care may be needed to elucidate the true impact of mSCD on long term patient outcomes in ARM patients.

TYPE OF STUDY

Retrospective Comparative Study.

LEVEL OF EVIDENCE

III.

Spinal cord anomalies in children with anorectal malformations: a retrospective cohort study

PURPOSE

First, to assess the number of spinal cord anomalies (SCA), specifically tethered spinal cord (TSC) in patients with anorectal malformations (ARM), identified with spinal cord imaging (i.e. spinal cord US and/or MRI). Second, to report outcomes after TSC treatment.

METHODS

A retrospective mono-center study was performed. All ARM patients born between January 2000 and December 2021 were included. Screening for SCA consisted of spinal cord US and/or MRI. Radiology reports were scored on presence of SCA. Data were presented with descriptive statistics.

RESULTS

In total, 254 patients were eligible for inclusion, of whom 234 (92.1%) underwent spinal cord imaging. In total, 52 (22.2%) patients had a SCA, diagnosed with US (n = 20, 38.5%), MRI (n = 10, 19.2%), or both US and MRI (n = 22, 42.3%), of whom 12 (23.5%) with simple, 27 (52.7%) intermediate, and 12 (23.5%) complex ARM types. TSC was identified in 19 patients (8.1%), of whom 4 (21.1%) underwent uncomplicated neurosurgical intervention.

CONCLUSIONS

SCA were present in 22% of ARM patients both in simple, as well as more complex ARM types. TSC was present in 19 patients with SCA, of whom 4 underwent uncomplicated neurosurgical intervention. Therefore, screening for SCA seems to be important for all ARM patients, regardless of ARM type.

LEVEL OF EVIDENCE

Level III.

Role of ultrasonography in screening of spinal dysraphism in infants at risk

Background

Spinal dysraphism (SD) encompasses congenital spinal defects that result from inappropriate fusion of the different midline osseous, mesenchymal, and neural elements. The primary tools for diagnosis of SD are both spinal ultrasonography (USG) and magnetic resonance imaging (MRI). Spinal USG is growingly being used as an initial screening modality with sensitivities and accuracies equivalent to those of MRI. Anorectal malformations (ARM) have ultimate association with many other congenital abnormalities, of which spinal dysraphism is one of the most common. The main aim of study was to assess the diagnostic accuracy of spinal USG as a screening modality in comparison with MRI in infants with closed spinal dysraphism. We also endeavored to highlight the associated spinal dysraphism radiological findings in patients with either ARM or back cutaneous stigmata.

Results

Our prospective diagnostic comparative study included 33 patients, all of whom underwent both MRI and USG. Both MRI and USG showed appreciable agreement in the assessment of spinal dysraphism. In comparison with the gold standard MRI, spinal USG revealed comparable diagnostic metrics: specificity (98.6–100%), sensitivity (66.6–91.6%), PPV (90–100%) and NPV (94.1–98.7%) in diagnosis of different types of spinal dysraphism. The main clinical presentation of nineteen patients was anorectal malformation (ARM), 11 of whom (57.9%) had evidence of associated spinal dysraphism. The most common types of ARM were cloacal malformation, recto-urethral fistula, and rectal atresia with no fistula. On the other hand, sixteen patients were mainly presented with back cutaneous stigmata, 11 of whom (68.8%) had associated spinal dysraphism. The most common presenting cutaneous stigmata were low back swelling and atypical dimples.

Conclusion

The front-line screening modality for infants with closed SD should be spinal USG, however, its main limitation is the restrained time window in the first 6 months of life. Infants with ARM should be screened for spinal anomalies, especially those with high and complex types. Infants with high-risk back cutaneous stigmata should be similarly screened, as well.

Development of Sacral Ratio Percentile Card for Children: A Preliminary Report

INTRODUCTION

 Sacrospinal anomalies that may accompany anorectal malformations may cause fecal and urinary incontinence despite proper anomaly treatment. The sacral ratio has been suggested in the determination of both the prognosis in terms of incontinence and the need for further examination for sacrospinal anomalies. The normal and clinically decisive values of sacral ratio are given differently in publications. We aimed to determine the distribution of the sacral ratio in children under 12 months and to develop the sacral ratio percentile card that will enable one to give an age-independent parametric result in clinical evaluations.

MATERIALS AND METHODS

 The files of patients under 1 year of age who had anteroposterior direct radiography including pelvis were reviewed retrospectively. Sacral ratio was studied for 360 patients, 30 patients per month. Percentile card was developed with LMS software and reference values were used as 1, 2, 3, 4, and 10%.

RESULTS

 The lowest sacral ratio value was 0.514 and the highest value was 0.936. There was no statistical difference between the mean sacral ratio of the cases when they were classified on a monthly basis (p = 0.191). Low percentile values were found slightly different at first 4 months of age.

CONCLUSION

 Although the mean of sacral ratio does not change significantly during the first year of life, values that are considered pathological for patients are within different percentile limits depending on age. Instead of using sacral ratio with some clinically decisive values, we think that parametric evaluation with the help of the percentile card will increase its clinical value.

Predictive value of spinal bone anomalies for spinal cord abnormalities in patients with anorectal malformations

AIM

To evaluate the correlation between sacral/vertebral anomalies and spinal cord anomalies (SCA) on MRI, in patients with anorectal malformation (ARM).

METHODS

Patients with ARM consecutively treated between January 1999 and August 2019 were included. Radiological imaging of sacrum and spine were retrospectively analyzed and correlated to the presence of SCA at MRI. Fisher's exact test and X² test were used as appropriate; p<0.05 was considered statistically significant.

RESULTS

348 patients with ARM were enrolled in the study, 147 presented SCA at MRI. 144 patients showed spinal bone anomalies, isolated vertebral and sacral anomalies were found in 17,6% and 35% respectively. Higher level of ARM was associated with a significant higher prevalence of sacral and vertebral anomalies. A significant correlation was found between the "level" of ARM and the presence of SCA (p<0.05). Sacral anomalies were significantly correlated with the presence of SCA at MRI (p<0.05). SCA were found in 70% of patients with vertebral anomalies (VA) and in 76% of patients with sacral anomalies. The presence of multiple malformations (vertebral and sacral anomalies) are strictly related to the presence of SCA. However, the absence of spinal bone anomalies does not exclude the presence of SCA. SD was the most represented type of SCA (n=94/147), of those 96% had fatty filum. Neurological or neurourological symptoms were detected in 11,5% patients (n=17) with SCA and required neurosurgical intervention.

CONCLUSIONS

Our data confirm the strong relation between sacral or vertebral anomalies and SCA. However, in our series also patients without sacral/vertebral anomalies had SCA at MRI. Our results suggest that, despite the presence or absence of spinal anomalies, spinal cord MRI should be performed in all children with ARM, to allow a correct multidisciplinary follow-up and treatment. In fact, most patients with spinal bone and SCA are asymptomatic, but could develop clinical manifestations during their growth.

Functional outcome after cord detethering in fecally incontinent patients with anorectal malformations

PURPOSE

Tethered cord (TC) occurs in 36% of patients with anorectal malformations (ARMs), for whom the benefit of detethering surgery remains unclear regarding bowel and/or bladder function. This study aimed to examine whether cord detethering could improve fecal and urinary incontinence in these patients.

METHODS

This was a retrospective study of TC patients (>3 years old) with fecal incontinence and ARMs, who underwent detethering surgery between 2016 and 2020 and were followed up for at least 6 months.

RESULTS

Of the 27 included patients, 55% had sacral ratios between 0.4 and 0.7, and in 37% it was < 0.4; the remaining 8% was over 0.7; 52% suffered from colonic hypermotility. After detethering surgery, partial fecal continence was achieved in five patients (18%); total fecal continence, in ten patients (37%); 12 (44%) remained fecally incontinent. Partial urinary continence was obtained in four cases (14%), and the number of patients with total urinary continence rose from 7 (25%) to 15 (55%). Lower extremity symptoms were also improved in 72% of the cases. Patients with colonic hypomotility were found to have a better functional outcome than those with colonic hypermotility (69% vs. 43%, respectively).

CONCLUSION

Our study demonstrated that detethering surgery led to remarkably improved bowel and bladder control in ARM patients with fecal incontinence, which, surprisingly, was not associated with sacral ratio.

Long-term urologic and gynecologic follow-up and the importance of collaboration for patients with anorectal malformations

Anorectal malformations (ARM) are well recognized to be associated with anomalies in other organ systems. The introduction of screening protocols has increased the diagnosis of these anomalies and greater collaboration with other specialties has influenced the treatment and follow-up of patients with ARMs. Much of the medical literature regarding the treatment of anorectal malformations has focused on technical details of operations and early post-surgical outcomes. Recently, an increase in published data regarding the long-term sequelae of an ARM diagnosis has resulted in an emphasis extended follow up in this population. Patient support groups have highlighted complex issues in ARM patients persist into adulthood have advocated for improved transitional care. This article describes the benefits of long-term follow-up and identifies key issues in ARM patients with respect to urologic and gynecologic health. A collaborative model of care is outlined and suggested timings of screening for potential problems is described.

Urinary Tract Anomalies in Patients With Anorectal Malformations: The Role of Screening and Clinical Follow-Up

OBJECTIVE

To evaluate the efficacy of the screening protocol and the clinical follow-up to detect urological anomalies (UA) in patients with ARM (ARM-P) in our institution. Secondary aim was to define the prevalence of UA and their relationship with severity of ARM.

METHODS

ARM-P were selected from a prospectively maintained database from 2000 to 2016. Exclusion criteria were: incomplete or with less than 3 years of follow-up and absence of surgical correction of the anorectal anomalies. Data from urological screening and follow-up were collected. Patients were divided into complex malformations (Group 1) and less complex malformations (Group 2).

RESULTS

One hundred seventeen of 149 were included in the study period (62 group 1, 55 group 2). UA were detected in 36/117 at birth (30.7%) with a difference between groups (P = .0005). VUR was detected in 16 (6 with hydronephrosis, 10 with normal ultrasound at birth). A bladder ultrasound after potty training showed 18 lower urinary tract dysfunction (LUTD; 15 with UA detected at birth, 3 with normal ultrasound). 8 LUTD were found during clinical follow-up, confirmed by ultrasound. Spinal MRI detected spinal cord anomalies (SCA) in 52/117 (44.4%). Considering the subgroups with neurogenic bladder and SCA there was a difference between groups (13/33 vs 1/19).

CONCLUSION

This study suggests that ARM-P are at increased risk of UA, most of which were detected on neonatal ultrasound. While screening protocol can show 88% of UA, follow-up can detect 12.9 % of total abnormalities without difference between groups. This data has to be considered when planning follow-up for these patients.