Predictors of Mortality and Modern Surgical Strategies in Intestinal Obstruction: A 200-Patient Study from a North Indian Tertiary Center

Abstract

Background:

Intestinal obstruction remains a common surgical emergency associated with considerable morbidity and mortality, especially in low- and middle-income countries. The evolving epidemiology, emergence of postoperative adhesions as a leading cause, and adoption of modern surgical practices necessitate updated real-world analyses.

Materials and Methods:

A retrospective study was conducted on 200 patients who underwent surgical management for intestinal obstruction at Indraprastha Apollo Hospitals, New Delhi, India, between January 2018 and December 2023. Demographic, clinical, radiologic, intraoperative, and outcome data were collected. Multivariate logistic regression was used to identify the independent predictors of in-hospital mortality.

Results:

Postoperative adhesions (32%) and external hernias (18%) were the most common causes of obstruction. Abdominal pain (100%), vomiting (94%), and distension (88%) were the predominant presenting symptoms. Computed tomography (CT) scans were performed in 35% of cases and led to changes in surgical planning in over 60% of those patients. Surgical interventions included adhesiolysis (32%), hernia repair (18%), bowel resection with anastomosis (24%), and stoma creation (9%). The overall in-hospital mortality rate was 7%. On multivariate analysis, the significant predictors of mortality were strangulated obstruction (OR 5.2, P = 0.002), delayed presentation >48 h (OR 3.8, P = 0.02), and presence of peritonitis (OR 2.9, P = 0.03). Partial enhanced recovery after surgery implementation in 48% of patients was associated with shorter hospital stay and fewer infectious complications.

Conclusion:

This large single-center study identifies the key predictors of mortality and highlights the practical role of CT imaging and enhanced recovery protocols in the surgical management of intestinal obstruction. Early referral, timely surgical intervention, and protocol-driven care are essential to improve the outcomes in resource-constrained settings.

INTRODUCTION

Global burden and clinical significance

Intestinal obstruction remains one of the most common surgical emergencies, accounting for 15%–20% of acute surgical admissions globally and contributing significantly to morbidity and mortality rates, particularly in low- and middle-income countries (LMIC).[1,2] Its etiology spans postoperative adhesions, hernias, malignancy, volvulus, and less common causes such as strictures and foreign bodies. The burden is particularly profound in resource-limited settings, where delayed presentation and suboptimal access to imaging and surgical intervention often lead to worse outcomes.[3]

Evolving surgical landscape

The management of intestinal obstruction has evolved substantially over the past decade. High-resolution multidetector computed tomography (CT) has largely replaced plain radiographs as the first-line diagnostic modality, with a sensitivity of 91% and specificity of 89% for identifying small bowel obstruction and its complications.[4,5] CT not only assists in confirming the diagnosis but also localizes the obstruction, identifies strangulation or ischemia, and influences surgical planning.[6]

In parallel, enhanced recovery after surgery (ERAS) protocols have reshaped perioperative care, emphasizing multimodal, evidence-based strategies to reduce the complications and promote faster recovery. Studies have demonstrated that ERAS implementation can reduce postoperative complications by up to 35%, shorten hospital stay, and improve functional recovery.[7,8] While initially developed for elective colorectal procedures, ERAS is gaining traction in emergency surgery, including obstructive pathologies.[9]

Knowledge gaps and mortality predictors

Despite these advances, postoperative mortality in surgically managed intestinal obstruction remains substantial, ranging between 5% and 25% in various series.[10,11] The key predictors include advanced age, delayed presentation, presence of comorbidities, strangulated obstruction, and peritonitis at presentation.[12,13,14] However, much of the literature focuses on single-etiology cohorts or limited patient populations. In addition, the impact of modern diagnostic imaging and ERAS-based care on real-world surgical outcomes in intestinal obstruction is under-reported, especially from the developing world.

Study objectives

This retrospective study aims to address these gaps by analyzing 200 surgically managed cases of intestinal obstruction at a tertiary care center in North India. The primary objectives are as follows:

• To delineate the etiological profile, clinical presentation, and operative strategies in intestinal obstruction

• To assess surgical outcomes, with specific focus on morbidity and mortality

• To identify the independent predictors of mortality via multivariate analysis

• To evaluate the potential role of early CT imaging and ERAS-inspired practices in improving outcomes.

MATERIALS AND METHODS

Study design and setting

This was a retrospective and observational study conducted at Indraprastha Apollo Hospitals, New Delhi, at a high-volume tertiary care center in North India. The study analyzed the clinical records of 200 consecutive patients who underwent surgical intervention for intestinal obstruction between January 2018 and December 2023.

Ethical approval

Approval for the retrospective data collection was obtained from the Institutional Ethics Committee of Indraprastha Apollo Hospitals, New Delhi, and the need for individual informed consent was waived.

Inclusion and exclusion criteria

Inclusion criteria

• Patients aged 18 years and above

• Diagnosed with intestinal obstruction based on clinical, radiological, and intraoperative findings

• Underwent surgical management during the study period

• Complete medical records available for review.

Exclusion criteria

• Patients managed conservatively or nonoperatively

• Incomplete or missing key clinical or surgical data.

Data collection and variables

Data were collected from the hospital’s electronic medical record system and manually verified by two independent reviewers for accuracy. A structured pro forma was used to extract the following variables:

• Demographics: age, gender

• Medical history: comorbidities (e.g., diabetes, hypertension, and COPD), previous abdominal surgeries

• Clinical presentation: Abdominal pain, vomiting, distension, obstipation, and fever

• Physical findings: abdominal tenderness, distension, altered bowel sounds, and signs of peritonitis

• Diagnostic tools: plain abdominal X-rays and contrast-enhanced CT scans

• Intraoperative findings: etiology (adhesions, hernias, malignancy, etc.), level of obstruction (small vs. large bowel)

• Surgical procedures: adhesiolysis, hernia repair, bowel resection with or without stoma, others

• Postoperative outcomes: complications (SSIs, pneumonia, anastomotic leaks, and abscess), duration of hospital stay, and mortality.

Definitions

• Small versus large bowel obstruction was classified based on radiologic and intraoperative findings

• Delayed presentation was defined as >48 h from the symptom onset to hospital admission

• Strangulated obstruction included patients with ischemic, necrotic, or gangrenous bowel

• Mortality was defined as all-cause in-hospital death during the index admission.

Surgical management protocol

Preoperative management included nasogastric decompression, fluid resuscitation, correction of electrolyte imbalances, and broad-spectrum antibiotics. The choice of surgical approach – open versus laparoscopic – was at the discretion of the attending surgeon, based on patient condition and suspected etiology.

Operative interventions included

• Adhesiolysis using sharp or energy dissection

• Hernia repair (tissue vs. mesh-based)

• Bowel resection with anastomosis (hand-sewn or stapled)

• Stoma creation, where necessary

• Other procedures: Tumor resection, stricturoplasty, volvulus correction, and bypass operations.

Postoperative management

A pie chart representation of the etiological spectrum is shown in Figure 1. Postoperative protocols were based on the institutional ERAS guidelines and included: The predominant presenting features included abdominal pain (98%), vomiting (92%), and absolute constipation (70%) as shown in Figure 2.

Figure 1.

Etiology of intestinal obstruction (n = 200). Bar chart showing the distribution of etiological factors. Postoperative adhesions (32%) and external hernias (18%) were the most common causes, followed by malignancy (14%), volvulus (11%), and other less common etiologies including strictures, radiation enteritis, and foreign bodies

Figure 2.

Clinical presentation of patients with intestinal obstruction. Pie chart depicting presenting symptoms. Abdominal pain was universal (100%), followed by vomiting (94%), abdominal distension (88%), constipation/obstipation (82%), and systemic features such as nausea and fever

• Early mobilization

• Gradual oral intake

• Pain control (opioid-sparing)

• Thromboprophylaxis

• Antibiotic stewardship

• Daily monitoring for complications.

Statistical analysis

Data were analyzed using the SPSS software version 22.0 (IBM Corp., Armonk, NY, USA). Descriptive statistics were presented as frequencies and percentages for categorical variables and means ± standard deviations for continuous variables.

Comparative analyses were performed using:

• Chi-square or Fisher’s exact test for the categorical variables

• Independent t-test or Mann–Whitney U-test for the continuous variables, based on normality.

Multivariate logistic regression was employed to identify the independent predictors of mortality. Variables with P < 0.1 in univariate analysis were included in the multivariate model. P < 0.05 was considered statistically significant.

RESULTS

Patient demographics

A total of 200 patients were included, comprising 108 males (54%) and 92 females (46%), with a mean age of 46.2 ± 14.8 years (range: 18–82 years). The age distribution showed a predominance of cases in the 41–60 year bracket (42%).

Comorbidities and medical history

• Previous abdominal surgery: 84 patients (42%)

• Hypertension: 34 patients (17%)

• Diabetes mellitus: 24 patients (12%)

• COPD: 12 patients (6%)

• Ischemic heart disease: 10 patients (5%)

• Multiple comorbidities were present in 21% of the cohort.

Etiology of obstruction

The most common etiology was postoperative adhesions (32%), followed by obstructed external hernias (18%) and malignant strictures (14%), as depicted in Table 1.

Table 1.

Etiology of Intestinal Obstruction (n=200)

Surgical procedure	Number of patients (%)
Postoperative adhesions	64 (32)
External hernias	36 (18)
Malignancy	28 (14)
Volvulus	22 (11)
Tubercular strictures	18 (9)
Radiation enteritis	12 (6)
Intussusception	10 (5)
Foreign bodies	6 (3)
Others	4 (2)
Total	200 (100)

FB=Foreign body, RE=Radiation enteritis

Clinical presentation

• Abdominal pain: 100%

• Vomiting: 94%

• Abdominal distension: 88%

• Constipation/obstipation: 82%

• Nausea: 58%

• Fever: 21%.

Physical examination findings

• Abdominal tenderness: 93%

• Distension: 87%

• Altered bowel sounds: 83%

• Signs of peritonitis: 16%

• Palpable hernia or mass: 18%.

Diagnostic workup

• Plain abdominal X-rays: Used in all patients

  • Sensitivity: 86% for detecting SBO or LBO.

• CT abdomen: Done in 70 patients (35%)

  • Sensitivity: 92%

  • Most commonly used in suspected strangulation, malignancy, or uncertain etiology.

Operative findings and procedures

Surgical interventions ranged from adhesiolysis and bowel resections to stoma formations, depending on the underlying pathology as seen in Table 2.

Table 2.

Surgical procedures performed

Procedure	Number of patients (%)
Adhesiolysis	64 (32)
Bowel resection+anastomosis	48 (24)
Hernia repair	36 (18)
Stoma creation	18 (9)
Stricturoplasty	6 (3)
Others	28 (14)

• Laparoscopic approach attempted: 18 cases (9%), with 6 conversions

• Primary anastomosis performed in 88% of resection cases

• Stoma was required in patients with fecal contamination, hemodynamic instability, or poor bowel viability. Distribution of surgical procedures performed across the cohort is illustrated in Figure 3.

Figure 3.

Surgical procedures performed in the study cohort. Bar chart summarizing the types of surgical interventions. Adhesiolysis (32%) and bowel resection with anastomosis (24%) were the predominant procedures, followed by hernia repair, stoma creation, and other procedures like stricturoplasty and volvulus correction

Postoperative complications

The most common complications were wound infection (10.5%), anastomotic leak (2.5%), and prolonged ileus (6%). Table 3 represents the spectrum of complications encountered.

Table 3.

Postoperative complications

Complication	Number of patients (percentage of cohort)
Surgical site infection	18 (9)
Pneumonia	14 (7)
Anastomotic leak	8 (4)
Wound dehiscence	6 (3)
Intra-abdominal abscess	4 (2)
No complications	150 (75)

Mean postoperative stay was 11.2 ± 4.5 days (range: 4–26 days). Postoperative complications stratified by type are visualized in Figure 4.

Figure 4.

Postoperative complications following surgery for intestinal obstruction. Donut chart representing the incidence of early postoperative complications. Surgical site infection (9%) and pneumonia (7%) were most common, followed by anastomotic leaks, wound dehiscence, and intra-abdominal abscesses

Mortality analysis

The overall in-hospital mortality rate was 7% (14 patients).

Univariate analysis revealed significant associations with:

• Strangulated obstruction (P < 0.001)

• Delayed presentation >48 h (P = 0.003)

• Presence of peritonitis (P = 0.01)

• Age >60 years (P = 0.04)

• Multiple comorbidities (P = 0.02). Forest plot analysis of multivariate predictors of mortality is presented in Figure 5.

Figure 5.

Forest plot of independent predictors of mortality (multivariate analysis). Graphical representation of odds ratios with 95% confidence intervals for significant predictors of in-hospital mortality. Strangulated obstruction, delayed presentation (>48 h), and peritonitis were identified as statistically significant predictors

Multivariate logistic regression (predictors of mortality)

Multivariate logistic regression identified strangulated bowel, delayed presentation beyond 48 hours, and presence of feculent peritonitis as independent predictors of mortality, as seen in Table 4.

Table 4.

Multivariate predictors of mortality

Variable	OR	95% CI	P
Strangulated obstruction	5.2	1.8–15.1	0.002
Delayed presentation	3.8	1.2–11.9	0.02
Peritonitis	2.9	1.1–7.4	0.03
Age >60 years	2.1	0.9–6.1	0.06

OR=Odds ratio, CI=Confidence interval

Role of modern tools

• CT scans led to change in operative plan in 63% of cases where used

• ERAS components (early ambulation, minimal opioids, and early oral intake) were successfully implemented in 48% of cases.

• This subgroup had a lower mean LOS (8.9 days) and fewer SSIs (4%), although not statistically significant (P = 0.09).

DISCUSSION

Principal findings and clinical relevance

This retrospective study of 200 surgically managed cases of intestinal obstruction at a high-volume North Indian tertiary center offers critical insights into the evolving etiological trends, surgical strategies, and postoperative outcomes in a resource-constrained setting. Postoperative adhesions and external hernias emerged as the leading causes, accounting for 50% of the cases, consistent with global data.[1,2] Despite the integration of modern perioperative strategies, the overall mortality rate was 7%, underscoring the ongoing clinical challenge this condition presents.

Comparison with existing literature

The etiological profile in our cohort reflects the transition in obstruction patterns witnessed across many developing nations from obstructed hernias to postoperative adhesions as elective hernia repair becomes more prevalent. Lawal OO et al. and Taylor et al. similarly highlighted adhesions as the dominant cause in their respective high-income and LMIC studies.[3,4]

The 7% mortality rate in our study compares favorably with reports from other developing nations, where rates vary from 8% to 20%.[5,6] This relatively lower rate may be attributed to improved surgical preparedness, access to imaging, and partial adoption of ERAS components. However, mortality remained unacceptably high among high-risk subgroups, highlighting the importance of timely intervention and optimized perioperative care.

Independent predictors of mortality

Multivariate analysis identified strangulated obstruction (OR 5.2, P = 0.002), delayed presentation >48 h (OR 3.8, P = 0.02), and presence of peritonitis (OR 2.9, P = 0.03) as the significant predictors of mortality. These findings echo previous studies which emphasized that time to surgery and bowel viability are the most powerful determinants of outcome.[7,8] Notably, age >60 years showed a trend toward significance, aligning with prior work indicating reduced physiological reserve as a risk factor.[9]

This reinforces the necessity of early referral, rapid diagnostic workup, and aggressive resuscitation in suspected high-risk cases.

Role of modern imaging and eras

The integration of contrast-enhanced CT in 35% of cases led to changes in surgical decision-making in over 60% of those patients, reflecting its indispensable role in modern emergency surgery. As supported by Darbyshire AR et al. and Sallinen V et al., CT allows for superior identification of obstruction level, ischemia, and transitional zones.[10,11]

Our study also provides one of the few real-world snapshots of ERAS protocol elements applied in emergency surgery. Although implemented partially (in ~48% of cases), patients in this group experienced shorter hospital stays and fewer wound infections. While not statistically significant (P = 0.09), this trend supports the growing evidence that ERAS principles when adapted to the emergency setting can enhance recovery.[12,13]

Implications for practice

Our findings support a call to action in several domains:

• Early imaging using CT should be encouraged as the diagnostic standard

• Public education and referral networks must be strengthened to prevent late-stage presentations

• Strangulation suspicion should trigger expedited surgery to improve survival

• Institutional ERAS adaptation in emergencies must be promoted, with surgeon-led protocols balancing patient safety and enhanced recovery.

Strengths of the study

This study is one of the largest single-center surgical audits of intestinal obstruction in India to date. The use of multivariate analysis adds strength to our conclusions, and the integration of modern perioperative strategies into an LMIC context makes this study both timely and globally relevant.

Limitations

Our study is limited by its retrospective design and single-center scope, which may affect external generalizability. Variability in surgical decision-making and ERAS compliance was not standardized or randomized. In addition, long-term follow-up beyond the index admission was not included.

CONCLUSION

Intestinal obstruction continues to pose a significant surgical challenge, particularly in resource-limited settings where delayed presentation and diagnostic constraints amplify morbidity and mortality. In this high-volume North Indian tertiary center study, postoperative adhesions and hernias emerged as the leading causes of obstruction, reflecting evolving epidemiological patterns.

Despite advancements in surgical techniques and perioperative care, mortality remains high, especially in patients presenting with strangulated bowel, peritonitis, or delayed hospital admission. Our multivariate analysis highlights these factors as the independent predictors of mortality, offering valuable guidance for triage and early surgical intervention.

The integration of CT imaging and selective implementation of ERAS principles demonstrates potential for improving outcomes, reinforcing the need for protocolized care even in emergency surgical settings. Future multicenter, prospective studies are warranted to validate these findings and to refine context-specific management algorithms that bridge the gap between evidence and practice.

What this study adds

• Provides one of the largest single-center surgical audits of intestinal obstruction (n = 200) from a North Indian tertiary hospital

• Identifies strangulated obstruction, delayed presentation, and peritonitis as independent predictors of in-hospital mortality

• Demonstrates the real-world value of CT imaging in surgical planning and partial ERAS integration in improving the short-term outcomes

• Offers a practical, data-driven framework for enhancing surgical decision-making and resource prioritization in the low-to-middle income countries.

Conflicts of interest

There are no conflicts of interest.

Funding Statement

Nil.