Clinical overview
Enhanced Recovery After Surgery (ERAS) is a bundle of evidence-based, multimodal perioperative interventions that, applied together, attenuate the surgical stress response and accelerate return to baseline function. It is not a single intervention but a care pathway — a coordinated sequence of small, individually modest, evidence-supported steps spanning the pre-, intra- and post-operative phases, owned jointly by surgeon, anaesthetist, nursing staff and the patient herself. The clinical premise is simple: most of the morbidity, delay and discomfort after major gynaecological surgery is iatrogenic and avoidable — caused by prolonged fasting, mechanical bowel preparation, opioid-heavy analgesia, generous "maintenance" crystalloid, routine drains and tubes, and enforced bed rest — rather than by the disease or the operation itself. Remove or modify each of these, and the patient eats, mobilises, passes flatus and goes home sooner, with fewer complications and the same or lower readmission rates.
ERAS is not a list of items to be recited in isolation. The clinical work is to weave the principles into the actual care of a real post-operative patient: to recognise where an individual patient is on her recovery trajectory, decide which ERAS elements apply, reconcile them against her comorbidities and the resources of your hospital, and justify the trade-offs. Accordingly this chapter weights Assessment and Management most heavily, because the integration is where the difficulty lies. ERAS thinking touches almost every technical and obstetric objective: it underpins Perioperative fluids, rests on a sound Preoperative performance status assessment, governs recovery after Safe caesarean technique, and shares its multimodal-analgesia philosophy with post-operative care after MIS complication prevention.
Core knowledge
Figure F2.1 — ERAS blunts the surgical stress response: each element minimises one input to, or counteracts one output of, the neuroendocrine–inflammatory surge (catabolism, insulin resistance, salt-and-water retention, ileus) that slows recovery.
The physiological rationale: blunting the surgical stress response
Surgery triggers a neuroendocrine and inflammatory stress response: activation of the hypothalamic–pituitary–adrenal axis and sympathetic nervous system, with rising cortisol, catecholamines, glucagon and inflammatory cytokines. The downstream effects are catabolism (protein breakdown, negative nitrogen balance), insulin resistance with hyperglycaemia, sodium and water retention, gut hypomotility (ileus) and immune suppression. The longer and more invasive the operation — and the more it is compounded by starvation, dehydration, pain and immobility — the greater this response and the slower the recovery. Every ERAS element can be understood as an attempt to minimise one input into this stress response or to counteract one of its outputs. Pre-operative carbohydrate loading reduces post-operative insulin resistance; regional and multimodal analgesia blunts the sympathetic surge and spares opioids; goal-directed fluid therapy avoids the salt-and-water overload that causes gut oedema and ileus; early feeding and mobilisation reverse catabolism and restore gut function. Integration means seeing the physiology behind each item, so that when one element is unavailable you can reason about which others matter most.
The three phases and their core elements
Pre-operative (preparation and conditioning)
- Counselling and expectation-setting: the patient is told her recovery milestones (eat, drink, mobilise, go home on a defined day) and her role in them. This is the single most consistent predictor of success — an informed, engaged patient recovers faster.
- Optimisation: treat anaemia, control diabetes, encourage smoking and alcohol cessation, optimise nutrition. This overlaps directly with Preoperative performance status.
- Avoid prolonged fasting and mechanical bowel preparation: clear fluids are classically permitted until ~2 hours and solids until ~6 hours pre-operatively in patients without aspiration risk (standard anaesthetic teaching — confirm against your local anaesthetic protocol). Routine mechanical bowel prep is generally omitted for gynaecological surgery as it offers no benefit and causes dehydration and electrolyte disturbance.
- Carbohydrate loading: a carbohydrate-rich drink the night before and ~2 hours pre-operatively reduces thirst, anxiety and post-operative insulin resistance.
- Thromboprophylaxis and antibiotic prophylaxis: VTE risk-assess every patient; give a single dose of prophylactic antibiotics within ~60 minutes of incision; re-dose for long cases or major blood loss (standard surgical-prophylaxis teaching — follow local antimicrobial-stewardship and EML guidance).