Major elective abdominal surgery triggers profound neuroendocrine, metabolic, and systemic inflammatory stress responses characterized by severe catabolism, cellular insulin resistance, fluid retention, gastrointestinal dysmotility, and transient immunosuppression. Historically, standard perioperative surgical care has been guided by longstanding empirical surgical traditions: prolonged overnight fasting ("nil per os"), routine mechanical bowel cleansing, liberal intraoperative fluid administration, routine prolonged nasogastric tube (NGT) decompression, prophylactic peritoneal drainage, and bed rest enforced by heavy systemic opioid analgesia. The Enhanced Recovery After Surgery (ERAS) concept, pioneered by Henrik Kehlet and subsequently codified by international consensus guidelines, systematically re-evaluates each traditional perioperative step through evidence-based analysis. ERAS is a multimodal, multidisciplinary pathway spanning preoperative, intraoperative, and postoperative phases. Core components include structured patient education, shortened fluid fasting with preoperative carbohydrate loading, omission of routine bowel preparation and peritoneal drains, goal-directed fluid therapy, multimodal opioid-sparing analgesia (including regional neural blockade), active normothermia maintenance, early enterocyte nutrition, and planned early mobilization. Although widely validated in high-income healthcare institutions, adoption within resource-constrained public tertiary-care teaching hospitals in low- and middle-income countries (LMICs) often encounters institutional barriers, dogmatic resistance, and resource limitations. Demonstrating the feasibility, safety, and measurable clinical gains of ERAS in this clinical environment is essential to modernize local practice. This prospective randomized study was undertaken to evaluate the clinical impact of an ERAS protocol compared with conventional perioperative care in patients undergoing elective major abdominal surgeries at our tertiary-care teaching center.

Study Design and Setting A prospective randomized comparative trial was conducted over a period of 18 months in the Department of General Surgery at Vilasrao Deshmukh Government Medical College and Hospital, Latur, Maharashtra, India. Ethical clearance was formally granted by the Institutional Ethics Committee prior to participant enrollment, and written informed consent was obtained from all patients or their legal representatives. Inclusion and Exclusion Criteria Adult patients aged 18 to 70 years undergoing elective open abdominal surgeries (gastrointestinal resections, stoma reversals, hepatobiliary and gastroduodenal procedures, or open elective laparotomy for non-malignant or resectable neoplastic disease) with American Society of Anesthesiologists (ASA) physical status I–III were eligible. Exclusion criteria were: (1) emergency abdominal surgery; (2) laparoscopic procedures; (3) severe end-organ dysfunction (decompensated heart failure, severe COPD, ESRD on dialysis, Child-Pugh B or C cirrhosis); (4) ASA class IV or V; (5) inability to adhere to mobilization or feeding protocols due to neuropsychiatric impairment; and (6) intraoperative conversion to open abdomen or planned damage control. Randomization and Perioperative Interventions Eighty eligible patients were randomized into two equal groups of 40 using a computer-generated random allocation sequence: • ERAS Group (n = 40): Preoperative counseling, solid food allowed up to 6 hours and carbohydrate-rich drink (12.5% maltodextrin, 400 mL) up to 2 hours before induction; no routine mechanical bowel cleansing; thoracic epidural or ultrasound-guided TAP block combined with multimodal non-opioid IV analgesics; goal-directed fluid administration targeting euvolemia; forced-air warming; no routine NGT (or extubation removal); no prophylactic peritoneal drains; clear fluids at 4–6 hours postoperatively followed by soft diet on POD 1; Foley catheter removal on POD 1; structured ambulation (≥2 hours on POD 1, ≥4–6 hours on POD 2). • Conventional Group (n = 40): Overnight fasting (>8–12 hours); routine mechanical bowel prep for colorectal procedures; standard general anesthesia with IV opioids; liberal crystalloid maintenance (8–10 mL/kg/h); routine NGT until return of bowel sounds; routine abdominal drains; PRN parenteral opioids; bed rest until POD 1–2; oral liquids withheld until audible peristalsis and passage of flatus; catheter removal based on bed mobility. Outcome Evaluation and Discharge Criteria Primary outcomes were total postoperative hospital stay (days) and gastrointestinal recovery milestones (hours to first flatus and tolerance of solid diet without emesis). Secondary outcomes were postoperative pain on a 0–10 Numerical Rating Scale (NRS) recorded at 12, 24 (POD 1), and 48 hours (POD 2); 30-day morbidity graded by the Clavien-Dindo classification; rates of prolonged postoperative ileus (>72 h), postoperative nausea and vomiting (PONV), surgical site infection (CDC criteria), and 30-day readmissions. Standardized discharge criteria applied to both groups: adequate pain control on oral analgesics (NRS < 4), tolerance of solid diet, independent ambulation, absence of untreated surgical complications, and patient readiness. Statistical Analysis Data were compiled in Microsoft Excel and analyzed using SPSS version 26.0. Continuous parameters are reported as mean ± standard deviation (SD) and compared using the independent Student's t-test. Categorical variables are presented as frequencies and percentages and compared using the Pearson Chi-Square test or Fisher's exact test. A two-sided p-value < 0.05 was considered statistically significant.

All 80 randomized patients completed the study protocol and were included in the primary analysis (40 in the ERAS arm and 40 in the Conventional arm). Baseline demographic and clinical characteristics were well-balanced between both cohorts (Table 1). Table 1: Baseline Demographic and Operative Characteristics Characteristic ERAS Group (n=40) Conventional Group (n=40) p-value Age, years (Mean ± SD) 46.15 ± 13.82 48.30 ± 14.12 0.495 Male sex, n (%) 25 (62.5%) 27 (67.5%) 0.637 BMI, kg/m² (Mean ± SD) 24.28 ± 3.45 24.85 ± 3.60 0.476 ASA Grade I / II / III, n 18 / 18 / 4 16 / 19 / 5 0.882 Diabetes mellitus, n (%) 8 (20.0%) 9 (22.5%) 0.785 Hypertension, n (%) 10 (25.0%) 11 (27.5%) 0.798 Duration of surgery, min 148.60 ± 32.40 154.25 ± 35.15 0.457 Surgical Type, n (%) • Colorectal resection • Small bowel resection / stoma reversal • Gastroduodenal / hepatobiliary • Exploratory laparotomy (other) 14 (35.0%) 12 (30.0%) 8 (20.0%) 6 (15.0%) 15 (37.5%) 11 (27.5%) 9 (22.5%) 5 (12.5%) 0.912 Functional recovery milestones occurred significantly earlier in patients allocated to the ERAS protocol (Table 2). ERAS patients passed flatus approximately 27 hours earlier and tolerated solid diet nearly 37 hours earlier than conventional controls. Consequently, the mean postoperative hospital stay was reduced by 2.85 days (p < 0.001). Table 2: Gastrointestinal Recovery Milestones and Hospital Stay Outcome Parameter ERAS Group (n=40) Conventional Group (n=40) p-value Time to first flatus, hours 41.35 ± 8.64 68.20 ± 12.45 <0.001 Time to first bowel movement, hours 60.10 ± 11.20 88.55 ± 15.30 <0.001 Resumption of solid diet, hours 52.10 ± 9.80 89.45 ± 14.30 <0.001 Urinary catheter removal, hours 26.40 ± 6.25 64.80 ± 14.10 <0.001 Independent ambulation, hours 28.50 ± 7.15 58.70 ± 11.40 <0.001 Postoperative hospital stay, days 5.85 ± 1.62 8.70 ± 2.15 <0.001 Pain severity on the NRS was substantially lower in the ERAS arm at all evaluated time intervals (Table 3), reflecting the effectiveness of multimodal analgesia and regional anesthesia over on-demand systemic opioids. Table 3: Postoperative Pain Trajectory (NRS 0–10) Timepoint ERAS Group (n=40) Conventional Group (n=40) p-value POD 0 (12 hours post-op) 4.10 ± 0.95 5.65 ± 1.12 <0.001 POD 1 (24 hours post-op) 3.45 ± 0.85 5.20 ± 1.05 <0.001 POD 2 (48 hours post-op) 2.60 ± 0.74 3.85 ± 0.92 <0.001 POD 3 (72 hours post-op) 2.05 ± 0.60 2.80 ± 0.75 <0.001 Overall 30-day postoperative morbidity was significantly reduced in the ERAS group (20.0% vs 42.5%, p = 0.031; Table 4). The difference was primarily driven by significant reductions in PONV and prolonged paralytic ileus. Surgical site infection and 30-day readmissions showed no adverse difference between groups. Table 4: Postoperative Complications and 30-Day Outcomes Complication Category ERAS Group (n=40) Conventional Group (n=40) p-value Overall Morbidity (Clavien-Dindo I–IV) 8 (20.0%) 17 (42.5%) 0.031 Postoperative nausea & vomiting (PONV) 5 (12.5%) 14 (35.0%) 0.017 Prolonged paralytic ileus (>72 h) 2 (5.0%) 9 (22.5%) 0.024 Atelectasis / pulmonary infection 1 (2.5%) 6 (15.0%) 0.052 Urinary tract infection (UTI) 2 (5.0%) 5 (12.5%) 0.432 Surgical site infection (CDC criteria) 3 (7.5%) 6 (15.0%) 0.481 • Superficial / Deep SSI 3 (7.5%) 5 (12.5%) 0.712 • Organ/space infection 0 (0.0%) 1 (2.5%) 1.000 Anastomotic leak 1 (2.5%) 1 (2.5%) 1.000 Re-operation within 30 days 1 (2.5%) 1 (2.5%) 1.000 Readmission within 30 days 1 (2.5%) 2 (5.0%) 1.000

The core philosophy of ERAS is the systematic mitigation of the perioperative neuroendocrine and metabolic stress response through synergistic, evidence-based practices. In this prospective randomized study of patients undergoing elective open abdominal surgery, implementation of the ERAS protocol resulted in accelerated gastrointestinal recovery, superior postoperative pain control, a lower overall complication rate, and an average reduction of 2.85 days in hospital stay. A primary recovery milestone after major abdominal surgery is the resumption of coordinated intestinal motility. Conventional practices—including prolonged pre- and postoperative starvation, intraoperative fluid overload leading to splanchnic and submucosal bowel edema, routine NGT suctioning, and intermittent parenteral opioids—directly perpetuate postoperative paralytic ileus. In our study, ERAS patients passed flatus significantly earlier (41.35 vs 68.20 hours) and tolerated regular nutrition earlier (52.10 vs 89.45 hours). Avoiding routine mechanical bowel preparation maintained fluid-electrolyte equilibrium, while regional analgesia and early oral feeding preserved mucosal trophism and triggered physiologic gastrocolic reflexes. Effective analgesia without systemic sedation is fundamental to modern recovery protocols. By employing thoracic epidurals or TAP blocks combined with scheduled non-opioid analgesics, ERAS patients experienced lower pain scores at 12, 24, and 48 hours. Improved analgesia enabled out-of-bed mobilization by 28.5 hours (compared to 58.7 hours in conventional care). This early mobilization contributed to a marked reduction in pulmonary atelectasis and chest infections (2.5% vs 15.0%). Crucially, the early initiation of oral intake and omission of routine abdominal drains did not compromise surgical safety. The incidence of anastomotic leakage and SSI was not significantly different between cohorts. Routine prophylactic drainage has repeatedly been shown in surgical trials to be unhelpful in preventing leaks while hindering mobility and increasing drain-site wound morbidity. Importantly, the reduction in hospital stay from 8.70 to 5.85 days was not accompanied by increased 30-day readmissions (2.5% vs 5.0%), confirming that early discharge reflected genuine functional recovery rather than premature administrative discharge. In public healthcare systems with high patient volume and limited bed capacity, saving nearly three bed-days per elective laparotomy frees significant inpatient resources and reduces elective surgical backlogs. LIMITATIONS This study was conducted as a single-center randomized trial with 80 patients. Complete blinding of surgical staff and patients was not feasible because several protocol elements (such as presence of drains, catheters, and feeding regimens) were visibly distinct. While the full ERAS bundle was assessed, the relative contribution of each isolated intervention cannot be individually determined. Finally, long-term oncologic follow-up and formal post-discharge health-related quality of life (HRQoL) metrics were not assessed.

The Enhanced Recovery After Surgery (ERAS) protocol is safe, highly effective, and clinically superior to conventional perioperative care in elective open abdominal surgeries. It promotes rapid restoration of bowel motility, delivers better pain relief, significantly reduces overall postoperative morbidity, and safely shortens hospital stay without increasing readmission or reoperation rates. Standardized adoption of ERAS pathways across general surgical units is strongly recommended.

1. Kehlet H. Multimodal approach to control postoperative pathophysiology and rehabilitation. Br J Anaesth. 1997;78(5):606-617. 2. Ljungqvist O, Scott M, Fearon KC. Enhanced Recovery After Surgery: a review. JAMA Surg. 2017;152(3):292-298. 3. Gustafsson UO, Scott MJ, Hubner M, et al. Guidelines for perioperative care in elective colorectal surgery: Enhanced Recovery After Surgery (ERAS®) Society recommendations: 2018. World J Surg. 2019;43(3):659-695. 4. Greco M, Capretti G, Beretta L, Gemma M, Pecorelli N, Braga M. Enhanced recovery program in colorectal surgery: a meta-analysis of randomized controlled trials. World J Surg. 2014;38(6):1531-1541. 5. Ripollés-Melchor J, Ramírez-Rodríguez JM, Casans-Francés R, et al. Association between use of Enhanced Recovery After Surgery protocol and postoperative complications in colorectal surgery: the POWER study. JAMA Surg. 2019;154(8):725-736. 6. Varadhan KK, Neal KR, Dejong CH, Fearon KC, Ljungqvist O, Lobo DN. The Enhanced Recovery After Surgery (ERAS) pathway for patients undergoing major elective open colorectal surgery: a meta-analysis of randomized controlled trials. Clin Nutr. 2010;29(4):434-440. 7. Nelson G, Bakkum-Gamez J, Kalogera E, et al. Guidelines for pre- and intra-operative care in gynecologic/oncology surgery: Enhanced Recovery After Surgery (ERAS®) Society recommendations-Part I. Gynecol Oncol. 2016;140(2):313-322. 8. Miller TE, Thacker JK, White WD, et al. Reduced length of hospital stay in colorectal surgery after implementation of an Enhanced Recovery Protocol. Anesth Analg. 2014;118(5):1052-1061. 9. Zhuang CL, Ye XZ, Zhang XD, Chen BC, Yu Z. Enhanced Recovery After Surgery programs versus traditional rehabilitation for colorectal cancer patients: an updated meta-analysis of randomized controlled trials. Dis Colon Rectum. 2013;56(5):667-678. 10. Dindo D, Demartines N, Clavien PA. Classification of surgical complications: a new proposal with evaluation in a cohort of 6336 patients and results of a survey. Ann Surg. 2004;240(2):205-213. 11. Berríos-Torres SI, Umscheid CA, Bratzler DW, et al. Centers for Disease Control and Prevention guideline for the prevention of surgical site infection, 2017. JAMA Surg. 2017;152(8):784-791. 12. Weimann A, Braga M, Carli F, et al. ESPEN guideline: clinical nutrition in surgery. Clin Nutr. 2017;36(3):623-650. 13. Feldheiser A, Aziz O, Baldini G, et al. Enhanced Recovery After Surgery (ERAS®) for gastrointestinal surgery, part 2: consensus statement for anaesthesia practice. Acta Anaesthesiol Scand. 2016;60(3):289-334. 14. Paton F, Chambers D, Wellwood I, et al. Effectiveness and implementation of Enhanced Recovery After Surgery programmes: a rapid evidence synthesis. BMJ Open. 2014;4(7):e005015. 15. GlobalSurg Collaborative. Surgical site infection after gastrointestinal surgery in high-income, middle-income, and low-income countries: a prospective, international, multicentre cohort study. Lancet Infect Dis. 2018;18(5):516-525.