Henrik Kehlet introduced the concept of multimodal perioperative rehabilitation in a seminal 1997 paper, arguing that while no single intervention eliminated postoperative morbidity, coordinated multimodal protocols could dramatically improve outcomes. In a subsequent proof-of-concept series of 16 open sigmoid colectomies, Kehlet and Mogensen achieved 2-day hospital stay in approximately 60% of cases, compared to conventional stays of 5-10 days. This represented a conceptual breakthrough: the surgical stress response could be modulated through coordinated anesthetic, analgesic, nutritional, and mobilization interventions.

Kehlet Multimodal Concept1997Landmark

Conceptual framework for multimodal perioperative rehabilitation to reduce surgical stress response

Br J AnaesthConsensus0

Kehlet Fast-Track Series1999Landmark

Hospital stay — median 2 days achieved in ~60% of patients after open sigmoid colectomy

Br J SurgProspective CohortN=16

Proof

Landmark RCTs and pivotal trials that established the evidence base

The first formal ERAS consensus guidelines for colorectal surgery were published in 2005, followed by updated recommendations in 2012. Gustafsson and colleagues led the 2012 ERAS Society guidelines that defined 20 specific protocol elements spanning preoperative counseling, carbohydrate loading, epidural analgesia, early oral nutrition, and early mobilization. Multiple RCTs and systematic reviews demonstrated that ERAS protocols reduced hospital length of stay by 2.5 days and postoperative morbidity by 48% compared to traditional care, without increasing readmission rates.

ERAS Consensus 20052005Landmark

First consensus guidelines defining ERAS protocol elements for colorectal surgery

PlacentaConsensus0

ERAS Guidelines 20122013Landmark

Updated ERAS guidelines with 20 protocol elements for colonic surgery

World journal of surgeryConsensus0

Extension

Follow-up studies, subgroup analyses, and real-world validation

ERAS principles expanded beyond colorectal surgery to virtually every surgical specialty, including hepatobiliary, thoracic, urologic, gynecologic, and orthopedic surgery. The ERAS Society published specialty-specific guidelines for over 20 surgical procedures. Implementation science became a focus, with research demonstrating that protocol compliance correlated directly with outcome improvement. Updated ERAS colorectal guidelines in 2018 and 2025 incorporated evolving evidence on opioid-sparing analgesia, goal-directed fluid therapy, and prehabilitation.

ERAS Guidelines 20182019

Updated evidence-based recommendations incorporating goal-directed fluid therapy and opioid-sparing strategies

World journal of surgeryConsensus0

Guidelines

Integration into clinical practice guidelines and recommendations

ERAS protocols are now considered standard of care for colorectal surgery globally. The ERAS Society maintains regularly updated guidelines, and multiple national surgical societies incorporate ERAS principles into their perioperative care recommendations.

ERAS Society

Comprehensive ERAS protocol with 20+ elements recommended for all elective colorectal procedures

ASCRS

Enhanced recovery protocols recommended as standard perioperative care

Now

Current standard of care and ongoing research directions

ERAS has become the universal standard for perioperative care in colorectal surgery. Current research focuses on improving compliance (which typically ranges 60-80% across protocol elements), incorporating prehabilitation and nutritional optimization, integrating digital health tools for patient engagement, and personalizing protocols based on individual patient risk profiles. The frontier includes AI-driven recovery prediction, remote monitoring for early complication detection, and sustainable implementation strategies.

Landmark Trials in This Story

Kehlet Multimodal Concept1997Landmark

Multimodal approach to control postoperative pathophysiology and rehabilitation

Conceptual framework for multimodal perioperative rehabilitation to reduce surgical stress response

Br J AnaesthConsensus0

Kehlet Fast-Track Series1999Landmark

Hospital stay of 2 days after open sigmoidectomy with a multimodal rehabilitation programme

Hospital stay — median 2 days achieved in ~60% of patients after open sigmoid colectomy

Br J SurgProspective CohortN=16

ERAS Consensus 20052005Landmark

Endovascular trophoblast invasion and associated structural changes in uterine spiral arteries of the pregnant rat

First consensus guidelines defining ERAS protocol elements for colorectal surgery

PlacentaConsensus0

ERAS Guidelines 20122013Landmark

Guidelines for perioperative care in elective colonic surgery: Enhanced Recovery After Surgery (ERAS(®)) Society recommendations

Updated ERAS guidelines with 20 protocol elements for colonic surgery

World journal of surgeryConsensus0

ERAS Guidelines 20182019

Guidelines for Perioperative Care in Elective Colorectal Surgery: Enhanced Recovery After Surgery (ERAS®) Society Recommendations: 2018

Updated evidence-based recommendations incorporating goal-directed fluid therapy and opioid-sparing strategies

World journal of surgeryConsensus0

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Frequently Asked Questions

What is ERAS and how did it originate?+

Enhanced Recovery After Surgery (ERAS) is a multimodal perioperative care protocol developed by Henrik Kehlet in 1997. The concept combines coordinated interventions — preoperative counseling, carbohydrate loading, epidural analgesia, early nutrition, and early mobilization — to reduce the surgical stress response. Kehlet demonstrated 2-day hospital stays after open sigmoid colectomy, compared to conventional 5-10 day stays. Systematic reviews show ERAS reduces length of stay by 2.5 days and postoperative morbidity by 48%.

How effective is ERAS implementation in practice?+

Real-world implementation demonstrates consistent benefits, though compliance varies (typically 60-80% across protocol elements). Evidence shows a dose-response relationship: higher compliance correlates with better outcomes. Key barriers include institutional culture change, multidisciplinary coordination, and sustaining compliance over time. The ERAS Society has published guidelines for over 20 surgical specialties.