ERAS protocol
Reading File
Finding Sources
Searching PubMed
"enhanced recovery after surgery" ERAS protocol
Reading File
Reading File
Reading File
Reading File
Reading File
Finding Sources
Reading File
Reading File
Reading File
I now have comprehensive material to compose a detailed answer. Let me compile this.
ERAS Protocol (Enhanced Recovery After Surgery)
Overview
ERAS is a multidisciplinary, evidence-based perioperative care pathway first described by Professor Henrik Kehlet (Copenhagen, 1995), who showed that early oral nutrition, early mobilization, and epidural analgesia after colon surgery reduced length of stay to a median of 2 days after sigmoid resection. The ERAS Society (errassociety.org) was formally established in 2001 and now publishes specialty-specific guidelines.
The core aim is to attenuate the surgical stress response - particularly insulin resistance, immunosuppression, catabolism, and systemic inflammation - through a coordinated, multimodal approach covering all three perioperative phases.
Physiological Rationale
Surgery triggers a neuroendocrine stress response that causes:
- Insulin resistance - magnitude correlates with surgical complexity (open colorectal resection causes 3.5x the insulin resistance of laparoscopic cholecystectomy)
- Catabolism - glycogenolysis, gluconeogenesis, and protein breakdown increase several-fold after prolonged fasting + surgical stress
- Hyperglycemia - from peripheral glucose uptake impairment; worsened by free radical formation and inflammatory gene activation
- Pain-amplified resistance - pain independently reduces insulin sensitivity and raises cortisol, epinephrine, and free fatty acids
Achieving normoglycemia in the perioperative period normalizes the main metabolic components. This is why preoperative carbohydrate loading, epidural analgesia, and opioid minimization are all mechanistically linked.
Three-Phase Protocol Elements
Preoperative
| Element | Detail |
|---|---|
| Patient counseling & education | Realistic expectations, goals, discharge criteria |
| Nutritional optimization | Correct malnutrition; calculate BMI as surrogate marker |
| Fasting guidelines | Solids until 6 hours pre-op; clear liquids until 2 hours pre-op (ASA/ESA guidelines; exceptions: gastroparesis, obstruction, dysphagia) |
| Carbohydrate loading | 12.5% maltodextrin drink 2-3 hours pre-op (or 12 oz Gatorade); reduces insulin resistance, decreases hospital stay, improves postop muscle strength |
| Avoid bowel prep | No clear evidence of benefit; causes patient dissatisfaction, electrolyte disturbances, dehydration |
| VTE prophylaxis | Intermittent pneumatic compression +/- LMWH; combination for high-risk patients |
| Prehabilitation | Exercise, smoking cessation, alcohol reduction where applicable |
| Preoperative steroids | E.g., dexamethasone as antiemetic prophylaxis |
| No major comorbidities unoptimized | Hypertension, diabetes, COPD should be controlled |
Intraoperative
| Element | Detail |
|---|---|
| Minimally invasive approach | Laparoscopic/robotic when possible; reduces physiologic insult |
| Normothermia | Active warming to prevent hypothermia-related complications |
| Goal-directed fluid therapy (GDFT) | Avoid both under- and over-resuscitation; use stroke volume variance, tissue oxygen tension, or pulse contour analysis; no single superior technique; restrictive strategy preferred for major abdominal surgery |
| Multimodal analgesia | Pre-emptive NSAIDs, acetaminophen, gabapentinoids; regional anesthesia (epidural, TAP block, wound infiltration) |
| Opioid minimization | Opioid-sparing is the framework for ambulatory ERAS in particular |
| Peripheral nerve blocks | Reduce systemic opioid need |
| PONV prophylaxis | At least 2 antiemetic classes pre- and intraoperatively |
| Avoid drains | Routine drains not recommended (increases immobility, infection risk) |
| Regional/neuraxial anesthesia preference | Over GA when feasible |
Postoperative
| Element | Detail |
|---|---|
| Early oral feeding | Resume diet as soon as patient is fit; does not increase anastomotic leak risk |
| Early mobilization | Median time to first ambulation ~5-6 hours in ambulatory ERAS programs |
| IV fluid discontinuation | Aim to stop IV fluids ASAP, or by postoperative day 1 at latest |
| Urinary catheter removal | Timely discontinuation to allow mobilization |
| Multimodal pain control | Continue non-opioid analgesics; use regional anesthesia where possible |
| PONV treatment | Use a different antiemetic class than what was used prophylactically |
| Laxatives / ileus prevention | Chewing gum, magnesium, early feeding to stimulate gut motility |
| Ongoing GDFT | Volume optimization continues into postoperative period |
Key Outcomes
- Reduced hospital length of stay (colorectal surgery: from ~7-9 days to ~2-3 days)
- Reduced postoperative complications
- Lower intraoperative and postoperative opioid consumption
- Decreased healthcare costs
- In breast cancer surgery: same-day discharge increased from 7.2% to 58.6% with ERAS
- In acute appendectomy (RCT): ERAS discharge at mean 9.7 hours vs. 23.2 hours conventional; similar readmission rates
- Readmission rate in ambulatory oncologic ERAS: ~2.6% at 30 days
Specialty-Specific Applications
The ERAS Society has published protocols for:
- Colorectal surgery (original domain - most evidence)
- Hepatopancreaticobiliary surgery - focus on balanced fluids; restrictive strategy reduces ileus and urinary retention
- Gynecologic/gynecologic oncology - pelvic ERAS well-established
- Gastrectomy / esophagectomy - 2014 ERAS Society guidelines include preop nutrition, regional analgesia, minimal gastric decompression
- Urologic surgery (radical cystectomy) - dedicated ERAS pathway
- Orthopedic surgery (hip/knee) - recent meta-analyses (2025) confirm benefit
- Bariatric surgery
- Cardiac surgery - fast-track extubation is an ERAS element (2024 consensus statement, PMID 39545652)
- ENT/Head & Neck surgery
- Ambulatory surgery centers - modified protocols with strong opioid-sparing emphasis
Setting Up an ERAS Program
Effective implementation requires:
- A multidisciplinary team - surgeons, anesthesiologists, nurses, dietitians, physiotherapists
- Standardized order sets and goal-directed protocols
- Compliance monitoring - adherence to individual elements directly correlates with outcomes
- Audit and feedback cycles
- Patient engagement - education and realistic goal-setting pre-admission
Recent Evidence (2024-2026)
- ERAS in orthopedic hip surgery confirmed to reduce LOS and complications (Meta-Analysis, PMID 40454132, Clin Orthop Surg, 2025)
- Fast-track extubation in cardiac surgery: consensus recommendations published (PMID 39545652, Minerva Anestesiol, 2024)
- ERAS in orthognathic surgery: evidence synthesis published (PMID 40514016, J Oral Maxillofac Surg, 2025)
Sources: Schwartz's Principles of Surgery 11e (pp. 2113-2124) - Miller's Anesthesia 10e (pp. 10041-10043) - Berek & Novak's Gynecology (pp. 1225-1226) - Current Surgical Therapy 14e (p. 1495)
This is a shared conversation. Sign in to Orris to start your own chat.