Abstract
Background/purpose:
Unplanned reoperation rates becoming a critical metric for evaluating healthcare quality and have received increasing attention in recent years. Intestinal atresia (IA) has a high rate of unplanned reoperations. The purpose of this study is to evaluate the thirty-day unplanned reoperation rates and their risk factors in neonates with intestinal atresias after primary anastomosis surgery, and to construct a predictive nomogram.
Methods:
We developed and internally validated a predictive model from a retrospective cohort of 200 neonates admitted to our hospital for primary anastomosis surgery. The primary outcome was thirty-day unplanned reoperation rates. Independent factors significantly associated with thirty-day unplanned reoperation rates were identified using multivariable logistic regression analysis. The effectiveness of the developed nomogram was evaluated through calibration, discrimination, and clinical utility.
Results:
The incidence of thirty-day unplanned reoperation rates was 11%. Multivariable analysis identified the type of bowel anastomosis and combined meconium peritonitis as independent factors predicting thirty-day unplanned reoperation rates. The derivation model showed good discrimination, with a C-index of 0.791 (95% CI, 0.685–0.897), and good calibration (Hosmer–Lemeshow test P = 0.231). The analysis of the decision curve showed that the nomogram was beneficial in clinical practice.
Conclusion:
We developed a nomogram to predict thirty-day unplanned reoperations of primary anastomosis in neonates with IA. This prediction model may enable assist in clinical decision-making, patient counseling, and treatment planning.
Introduction
Intestinal atresia (IA) as one of the most common causes of neonatal bowel obstruction requires operative repair in the early neonatal period (). Primary anastomosis has emerged as the preferred surgical approach due to its advantages of shorter hospital stays and avoidance of stoma-related complications (–). The unplanned reoperations rates in IA varied considerably from 11%–25% (–). Unplanned reoperation serves as a crucial indicator of surgical quality for evaluating a hospital's capability to deliver safe and efficient care (). Reoperations often associated with prolonged hospital stays and increased healthcare costs (). Unfortunately, there still exists a scarcity of studies about the incidence of unplanned reoperation after primary anastomosis in IA neonates.
Identifying risk factors for unplanned reoperations could make a significant contributions to enhancing surgery quality, thus, the objective of this study lies in the investigation of risk factors underlying the aforementioned issue. To this end, we developed and validated a comprehensive prediction model, aiming to optimize clinical decision-making and improve outcomes for these patients.
Materials and methods
In this study, we conducted a retrospective analysis of clinical data from 200 neonates with IA who underwent primary anastomosis surgery at Fujian Maternity and Child Health Hospital between May 2013 and May 2021. The study include neonatal patients with intestinal atresia in the jejunum and ileum who received primary anastomosis; while patients who accepted enterostomy or suffered from anal atresia, concomitant intestinal nerve dysplasia, and other serious congenital malformations were excluded (Figure 1). The study began after approval by the ethics committee at Fujian Maternity and Child Health Hospital (No. 2024KY096).
Figure 1
The analyzed data encompassed the following parameters: patient's week of gestation, prematurity, birth weight, prenatal ultrasound, age at surgery, site and type of intestinal atresia, type of anastomosis, coexistence of meconium peritonitis (MP), concomitant malformations, intestinal necrosis/perforation, and whether reoperation was performed or not. Thirty-day unplanned reoperation can be defined as a surgical intervention required due to the complication arising from primary procedure within 30 days postoperation.
Statistical analysis
Statistical software IBM SPSS Statistics 26 and R version-4.2.0 (https://www.r-project.org) was used for data analysis. Quantitative data conforming to normal distribution was represented by x±s, quantitative data not conforming to normal distribution was represented by M (P25,P75), and comparison between two groups was performed by independent sample t test or non-parametric test. Qualitative data were presented in percentage n (%); chi-square test or Fisher test were used for comparison between groups. The selected relevant factors with p value < 0.05 were further analyzed by one-way and multi-factor binary logistics regression analysis, and Statistical significance was defined as p value < 0.05.
The discriminatory ability of the developed nomogram was assessed using the C-index and ROC curve analysis. The C-index statistic ranges from 0.5 (no discrimination) to 1.0 (perfect discrimination). The calibration curves were applied for examine the agreement between predicted and observed probabilities. Subsequently, the clinical utility of the nomogram was evaluated through decision curve analysis (DCA).
Results
Baseline characteristics
Among 200 patients included into the study, 112 were male and 88 were female, with an average weight of 2,946 ± 562 g. Among them, 13 (6.5%) patients were premature and 104 (52%) had abnormal prenatal ultrasound findings. In terms of intestinal atresia classification, type I occurred in 78 cases (39%), type II in 32 cases (16%), type III in 58 cases (29%), and type IV in 32 cases (16%). Regarding the site of intestinal atresia, duodenal atresia accounted for 45 cases (22.50%), jejunal atresia for 44 cases (22.00%), and ileal atresia for 111 cases (55.50%). For the method of intestinal anastomosis, 113 cases (56.50%) used end-to-side oblique anastomosis, 53 cases (26.50%) underwent septum resection, and 34 cases (17.00%) adopted other anastomosis methods, including end-to-end, side-to-side, and diamond-shaped anastomoses. During the surgery, it was found that 60 cases (30%) were complicated with MP, and 20 cases (10%) exhibited intestinal perforation and necrosis discovered intraoperatively. Of all the patients included in the study, a total of 22 experienced unplanned reoperations within 30 days post-surgery, resulting in an unplanned reoperation rate of 11%. Table 1 presents the baseline characteristics of the patients diagnosed with IA and received primary anastomosis surgery.
Table 1
| Variables | Total (n = 200) | No Reoperation (n = 178) | Reoperation (n = 88) | χ2/Z/t | P | |
|---|---|---|---|---|---|---|
| Sex, n (%) | Female | 88(44.00) | 80 | 8 | 0.585 | 0.444 |
| Male | 112 (56.00) | 98 | 14 | |||
| Age, n (%) | <2 d | 106 (53.00) | 96 | 10 | −2.117 | 0.034 |
| 2–5 d | 55 (27.50) | 38 | 1 | |||
| ≥5 d | 39 (19.50) | 28 | 11 | |||
| Fetal ultrasound, n (%) | No | 96 (48.00) | 81 | 15 | 3.939 | 0.047 |
| Yes | 104 (52.00) | 96 | 7 | |||
| Prematurity, n (%) | No | 187 (93.50) | 167 | 20 | 0.273 | 0.640 |
| Yes | 13 (6.50) | 11 | 2 | |||
| Stage, n (%) | â… | 78 (39.00) | 75 | 3 | −2.655 | 0.008 |
| II | 32 (16.00) | 28 | 4 | |||
| III | 58 (29.00) | 49 | 9 | |||
| IV | 32 (16.00) | 26 | 6 | |||
| Site, n (%) | Duodenum | 45 (22.50) | 43 | 2 | −1.510 | 0.131 |
| Jejunum | 44 (22.00) | 39 | 5 | |||
| Ileum | 111 (55.50) | 96 | 15 | |||
| Anastomotic method, n (%) | End-to-side | 113 (56.50) | 103 | 10 | −2.265 | 0.024 |
| Membrane Resection | 53 (26.50) | 52 | 1 | |||
| Others | 34 (17.00) | 23 | 11 | |||
| Meconium peritonitis, n (%) | No | 140 (70.00) | 131 | 9 | 9.962 | 0.002 |
| Yes | 60 (30.00) | 47 | 13 | |||
| Malformation, n (%) | No | 116 (58.00) | 102 | 14 | 0.322 | 0.570 |
| Yes | 84 (42.00) | 76 | 8 | |||
| Intestinal necrosis perforation, n (%) | No | 180 (90.00) | 160 | 20 | 0.023 | 1.000 |
| Yes | 20 (10.00) | 18 | 2 | |||
| Weight quantile, n (%) | <2,600 g | 50 (25.00) | 44 | 6 | −0.210 | 0.834 |
| 2,600–<3,000 g | 48 (24.00) | 45 | 3 | |||
| 3,000–≤3,300 g | 54 (27.00) | 46 | 8 | |||
| >3,300 g | 48 (24.00) | 43 | 5 | |||
Demographic characteristics of 200 IA patients.
Risk factors for thirty-day unplanned reoperations
The results of the univariate analysis indicated that the incidence of thirty-day unplanned reoperations for primary anastomosis in neonates with IA can be influenced by factors such as age at surgery, fetal ultrasound, stage of intestinal atresia, type of bowel anastomosis and combined with MP (all P value < 0.1). In multivariable analysis, risk factors significantly associated with unplanned reoperations were the type of bowel anastomosis and combined with MP (P < 0. 05) (Table 2).
Table 2
| Variables | Univariate analysis | Multivariate analysis | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| β | S.E | Z | P | OR (95% CI) | β | S.E | Z | P | OR (95% CI) | |
| Sex | ||||||||||
|  Female | 1.00 (Reference) | |||||||||
|  Male | −0.27 | 0.45 | −0.60 | 0.549 | 0.76 (0.31–1.85) | |||||
| Age | ||||||||||
|  <2 d | 1.00 (Reference) | 1.00 (Reference) | ||||||||
|  2–5 d | 0.88 | 0.47 | 1.85 | 0.064* | 2.40 (0.95–6.07) | 0.96 | 0.58 | 1.66 | 0.097 | 2.60 (0.84–8.04) |
|  ≥5 d | −1.38 | 1.07 | −1.29 | 0.197 | 0.25 (0.03–2.04) | −0.61 | 1.17 | −0.52 | 0.602 | 0.54 (0.05–5.41) |
| Fetal ultrasound | ||||||||||
|  No | 1.00 (Reference) | 1.00 (Reference) | ||||||||
|  Yes | −0.94 | 0.48 | −1.96 | 0.050* | 0.39 (0.15–1.00) | −0.93 | 0.57 | −1.65 | 0.099 | 0.39 (0.13–1.19) |
| Prematurity | ||||||||||
|  No | 1.00 (Reference) | |||||||||
|  Yes | 0.42 | 0.80 | 0.52 | 0.640 | 1.52 (0.31–7.34) | |||||
| Stage | ||||||||||
| â€ƒâ… | 1.00 (Reference) | 1.00 (Reference) | ||||||||
|  Ⅱ | 1.27 | 0.80 | 1.60 | 0.109 | 3.57 (0.75–16.97) | 0.48 | 0.95 | 0.50 | 0.614 | 1.61 (0.25–10.40) |
|  Ⅲ | 1.52 | 0.69 | 2.20 | 0.028* | 4.59 (1.18–17.81) | 0.65 | 0.84 | 0.77 | 0.444 | 1.91 (0.36–10.00) |
|  Ⅳ | 1.75 | 0.74 | 2.36 | 0.018* | 5.77 (1.35–24.74) | 1.15 | 0.91 | 1.26 | 0.206 | 3.17 (0.53–19.02) |
| Site | ||||||||||
|  Duodenum | 1.00 (Reference) | |||||||||
|  Ileum | 1.21 | 0.77 | 1.56 | 0.118 | 3.36 (0.74–15.34) | |||||
|  Jejunum | 1.01 | 0.87 | 1.17 | 0.241 | 2.76 (0.51–15.03) | |||||
| Anastomotic | ||||||||||
|  End-to-side | 1.00 (Reference) | 1.00 (Reference) | ||||||||
|  Membrane resection | −1.62 | 1.06 | −1.52 | 0.128 | 0.20 (0.02–1.59) | −0.03 | 1.27 | −0.02 | 0.983 | 0.97 (0.08–11.69) |
|  Others | 1.59 | 0.49 | 3.23 | 0.001* | 4.93 (1.87–12.97) | 1.85 | 0.56 | 3.31 | <.001 | 6.34 (2.12–18.92) |
| Meconium peritonitis | ||||||||||
|  No | 1.00 (Reference) | 1.00 (Reference) | ||||||||
|  Yes | 1.39 | 0.47 | 2.99 | 0.003* | 4.03 (1.62–10.03) | 1.19 | 0.57 | 2.09 | 0.036 | 3.29 (1.08–10.04) |
| Malformation | ||||||||||
|  No | 1.00 (Reference) | |||||||||
|  Yes | −0.27 | 0.47 | −0.57 | 0.571 | 0.77 (0.31–1.92) | |||||
| Intestinal necrosis perforation | ||||||||||
|  No | 1.00 (Reference) | |||||||||
|  Yes | −0.12 | 0.78 | −0.15 | 0.880 | 0.89 (0.19–4.12) | |||||
| Weight quantile | ||||||||||
|  1 | 1.00 (Reference) | |||||||||
|  2 | −0.72 | 0.74 | −0.97 | 0.332 | 0.49 (0.12–2.08) | |||||
|  3 | 0.24 | 0.58 | 0.42 | 0.675 | 1.28 (0.41–3.97) | |||||
|  4 | −0.16 | 0.64 | −0.25 | 0.804 | 0.85 (0.24–3.00) | |||||
Univariate and multivariate Cox regression analysis of risk factors for 30-day unplanned reoperations.
OR, odds ratio; CI, confidence interval.
Variables with p < 0.1 in univariate analysis were included in multivariate regression analysis.
Nomogram visualization and performance
Although there was no statistically significant difference in bowel atresia type in the multifactorial analysis, it was included in the model construction since its importance as a clinical variable in bowel atresia disease. The classification of intestinal atresia directly reflects the severity of the intestinal malformation and the complexity of the anatomical defects. These factors jointly influence the difficulty of the surgery, the possibility of postoperative recovery, and the risk of complications. Especially in type IIIb or IV IA, it associated with longer PN support and secondary procedures for intestinal failure (, ). Alessandro et al. research shown that sequelae are correlated with the type of atresia and length of residual bowel (). A predictive nomogram for unplanned reoperations in IA patients after primary anastomosis was developed through incorporating the three risk factors identified from multivariate logistic regression (Figure 2). Type of bowel anastomosis possessed the highest predictive effect, followed by stage of atresia, and MP. The probability of unplanned reoperations can be easily estimated by adding up the scores for each specific variable. Figure 3 showed the the area under the receiver operating characteristic (AUROC) of the predictive nomogram was 0.791 (95% CI, 0.685–0.897) using bootstrapping with 1,000 replicates, as he Harrell C-Index was 0.791. The derivation model presented good calibration, as the P value for the Hosmer-Lemeshow test was 0.231. Furthermore, internal validation demonstrated a good calibration comparable to the derivation model, as presented in Figure 4.
Figure 2
Figure 3
Figure 4
Clinical application
The decision curves of the nomogram revealed robust clinical utility and substantial net benefit within the risk range of 0.03–0.21 (Figure 5).
Figure 5
Discussion
With the continuous advancements in critical care and therapeutic strategies, the survival rate of infants diagnosed with intestinal atresia has shown a significant improvement, exceeding 90% (, ). In cases of non-complex intestinal atresia, primary anastomosis has been widely adopted by surgeons due to its effectiveness in reducing complications associated with ostomy formation (, , ). However, postoperative complications, including adhesive intestinal obstruction, anastomotic leakage, and stricture, frequently necessitate reoperation (–), particularly unplanned reoperations within the 30-day postoperative period. These complications significantly influence postoperative recovery and the overall health outcomes of affected infants, thereby establishing unplanned reoperation rates as a crucial indicator for assessing healthcare quality. In recent years, this issue has attracted growing attention in both clinical research and practice, highlighting the need for further investigation and optimization of surgical management strategies (–).
Cui et al. () reported that the incidence of unplanned reoperation in neonates undergoing primary repair of gastrointestinal disorders was 9.8% (29/296), among which 89.7% (26/29) of the cases involved patients who underwent enterectomy. The study revealed that patients suffering from enterectomy were more prone to requiring unplanned reoperation. Owing to the significant disparity in the diameter of the proximal and distal intestinal segments in cases of intestinal atresia, as well as the frequent association with MP, the rate of reoperation in these cases is notably higher compared to general intestinal surgeries.
This study identified that intestinal atresia complicated by MP is a significant risk factor for unplanned reoperation, with the probability of unplanned reoperation being 3.29 times higher compared to cases of isolated intestinal atresia. Nonetheless, the contrasting findings proposed by Chan et al. () demonstrates that the reoperation rates were comparable between patients with MP and those with isolated intestinal atresia (12% vs. 20%, P = 0.606), which reflects that the presence of MP has no correlation with the increase of reoperation risk.
Furthermore, this study highlights that the method of intestinal anastomosis is another critical risk factor for unplanned reoperation. Specifically, other anastomotic techniques (including end-to-end, side-to-side, and diamond-shaped anastomoses) were associated with a 6.34-fold higher risk of reoperation compared to end-to-oblique anastomosis. This finding underscores the superiority of the end-to-oblique anastomosis technique in the surgical management of intestinal atresia. Consistent with our results, Joda et al. reached the conclusion that end-to-side oblique anastomosis leads to a wide and early-functioning anastomosis, representing a straightforward but effective surgical procedure for intestinal atresia ().
The classification of intestinal atresia significantly impacts the prognosis of affected infants. Since being considered as complex forms of intestinal atresia, it is reasonable to presume that Types IIIb and IV atresias are closely linked to a higher risk of postoperative complications and reoperation (). Zhu et al. () claimed that the incidence of unplanned reoperation was 17.9% in neonates with apple-peel atresia. In our study, the risk of reoperation for type IV intestinal atresia was 3.17 times higher than that for type I, while the risks for types II and III were 1.61 and 1.91 times higher, respectively. However, further analysis revealed that the classification of intestinal atresia was not an independent risk factor for unplanned reoperations.
Certainly, the factors contributing to unplanned reoperations are not merely the intestinal anastomosis methods and whether their combination with MP obtained in this study. For instance, Yeung et al. noticed that prematurity and low birth weight were associated with functional obstruction leading to reoperation (). Other studies have also identified long operation time (), emergency surgery conducted at night (), and surgical technical errors () as significant reasons for unplanned reoperation.
The establishment of a predictive model for the risk of reoperation after neonatal intestinal atresia surgery will visually present the relationship between postoperative reoperation-related risk factors and the likelihood of postoperative reoperation via a nomogram. This approach tends to be conducive for medical staff to paying attention to the potential risks of postoperative reoperation in children, conducting early interventions for high-risk patients, and choosing temporary enterostomy when necessary. Additionally, interdisciplinary integration for targeted intervention and risk management also promotes the initiative and foresight of postoperative nursing work, thereby helping to reduce the incidence rate of postoperative reoperation in patients. Furthermore, it offers early psychological preparation for both medical staff and family members of affected children to alleviate doctor-patient disputes.
This study has several limitations. First, This study is a single-center retrospective study, which needs to be further confirmed by future studies. Second, patients' individual differences and comorbidities may have potential effects on the reoperation rate. Third, due to variations in treatment and nursing care, it is unclear whether our results are applicable to other centers.
Conclusion
To the best of our knowledge, this is the first report about establish a nomogram to predict thirty-day unplanned reoperations of primary anastomosis in neonates with IA. This study identified that type of bowel anastomosis and combined with MP were the risk factors of unplanned reoperation. A straightforward risk prediction model that includes these factors can assist in clinical decision-making, patient counseling, and treatment planning.
Statements
Data availability statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Ethics statement
The studies involving humans were approved by The ethics committee at Fujian Children's Hospital before beginning the study (No. 2024KY096). The studies were conducted in accordance with the local legislation and institutional requirements. Written informed consent for participation in this study was provided by the participants' legal guardians/next of kin.
Author contributions
ZL: Data curation, Formal analysis, Funding acquisition, Writing – original draft. WC: Data curation, Formal analysis, Writing – review & editing. ZF: Supervision, Writing – review & editing. FC: Writing – review & editing, Investigation, Project administration, Methodology. YF: Project administration, Methodology, Conceptualization, Writing – review & editing. ML: Supervision, Conceptualization, Writing – review & editing, Project administration.
Funding
The author(s) declare financial support was received for the research and/or publication of this article. This research supported by Joint Funds for the innovation of science and Technology, Fujian province (Grant number: 2024Y9577), Startup Fund for scientific research, Fujian Medical University (Grant number: 2022QH1222) and the Medical Double - High project of Fujian province.
Acknowledgments
The authors would like to thank all participants who contributed to the study.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Generative AI statement
The author(s) declare that no Generative AI was used in the creation of this manuscript.
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Abbreviations
IA, intestinal atresia; AUROC, area under the receiver operating characteristic; MP, meconium peritonitis.
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Summary
Keywords
intestinal atresia, reoperation, nomogram, risk factor, neonate
Citation
Lin Z, Chen W, Fang Z, Chen F, Fang Y and Liu M (2025) Establishment and validation of a nomogram to predict thirty-day unplanned reoperations of primary anastomosis in neonates with intestinal atresias. Front. Pediatr. 13:1660827. doi: 10.3389/fped.2025.1660827
Received
07 July 2025
Accepted
13 October 2025
Published
29 October 2025
Volume
13 - 2025
Edited by
Carmelo Romeo, University of Messina, Italy
Reviewed by
Filip Juric, Clinical Hospital Centre Rijeka, Croatia
Ahmet Dursun, Mugla University, Türkiye
Updates
Copyright
© 2025 Lin, Chen, Fang, Chen, Fang and Liu.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Mingkun Liu 529338548@qq.com
†These authors have contributed equally to this work and share first authorship
Disclaimer
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.