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The PRONE Equation: Precision Pain‑Breaking Approach

Multimodal, pre‑emptive and balanced analgesia are central to ERAS pathways, aiming to reduce the surgical stress response, minimize opioids, facilitate early mobilization and prevent breakthrough pain. The PRONE framework (Paracetamol, Regional anesthesia, Opioids, NSAIDs and “Extra” agents) provides a practical way to structure intraoperative and postoperative analgesia within these principles.

# # Concept of multimodal, pre‑emptive and balanced analgesia

Multimodal analgesia combines drugs and techniques with different mechanisms of action to achieve superior pain control with fewer side effects than any single agent alone. Pre‑emptive analgesia targets nociceptive pathways before the surgical stimulus, reducing central sensitization and subsequent pain intensity. Balanced analgesia mirrors “balanced anesthesia”: appropriate contributions from systemic agents, regional techniques and non‑pharmacological measures to avoid both under‑ and over‑treatment. ERAS guidelines emphasize opioid‑sparing multimodal regimens and early transition to oral medications to support gut function and mobilization.

# # P – Paracetamol

Paracetamol should be given as a foundation analgesic, ideally before incision (oral/IV) and then regularly postoperatively rather than on an “as needed” basis. It acts centrally and has a strong opioid‑sparing effect, improving quality of analgesia and reducing nausea, sedation and ileus associated with opioids. Within ERAS, scheduled paracetamol is almost universal, with dose adjustments in low body weight or hepatic impairment.

# # R – Regional anesthesia

Regional techniques are the cornerstone of opioid‑sparing multimodal analgesia and strongly supported by ERAS. Options include neuraxial (epidural, spinal with intrathecal morphine for select procedures), peripheral nerve and plexus blocks (e.g. TAP, ESP, femoral/adductor canal, interscalene, infraclavicular), and wound/infiltration catheters. When instituted pre‑incision, regional blocks contribute to pre‑emptive analgesia by blocking afferent input and limiting central sensitization, and continuous techniques give stable background analgesia that helps prevent breakthrough pain.

# # O – Opioids

Opioids remain important rescue and background agents but should no longer be the sole or dominant strategy. Intraoperatively, short‑acting opioids (e.g. fentanyl, remifentanil) are titrated to hemodynamic response, while regional and non‑opioid agents carry the main analgesic load. Postoperatively, ERAS recommends oral opioids in the lowest effective dose, preferably PRN on top of a strong non‑opioid base rather than long‑acting parenteral infusions. Patient‑controlled analgesia (PCA) can be used where regional is not possible, but the goal is to step down quickly to oral regimens as gut function returns.

# # N – NSAIDs

NSAIDs and COX‑2 inhibitors provide powerful anti‑inflammatory and opioid‑sparing effects, and their routine use (where not contraindicated) is a key ERAS element. Pre‑ or intraoperative dosing plus regular postoperative administration reduces pain scores and opioid consumption and therefore decreases nausea, ileus and respiratory depression. Caution is needed in patients with renal impairment, heart failure, bleeding risk or gastrointestinal disease, and dose and duration should be individualized.

# # E – Extra (others)

The “Extra” component includes several adjuvants that enhance multimodal, pre‑emptive and balanced analgesia. Low‑dose ketamine attenuates central sensitization and is particularly useful in major surgery and opioid‑tolerant patients. Intravenous lidocaine infusions during abdominal surgery may reduce pain, ileus and hospital stay, fitting well with ERAS goals. Gabapentinoids can reduce early opioid needs but must be balanced against sedation and dizziness, especially in older patients. Alpha‑2 agonists (clonidine, dexmedetomidine) add analgesia and sympatholysis, though hemodynamic and sedative effects must be monitored. Non‑pharmacological measures—good positioning, splinting, ice/heat, early physiotherapy and psychological preparation—further support pain control.

# # Preventing breakthrough pain within ERAS

Preventing breakthrough pain requires planned, scheduled baseline therapy plus timely rescue rather than reactive dosing. Pre‑incision loading of paracetamol, NSAID and regional block, followed by continuous or regular dosing postoperatively, maintains analgesic plasma levels and block effect. Clear escalation plans (e.g. stepwise increases in regional infusion rates or oral opioid rescue) and frequent pain assessment allow early intervention before severe pain recurs. By systematically applying the PRONE framework within ERAS, perioperative teams can deliver robust multimodal, pre‑emptive and balanced analgesia, minimizing opioid burden and avoiding breakthrough pain while supporting rapid, safe recovery.

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