Common Complications After Ambulatory Surgery

Pain & PONV - The Usual Suspects

Postoperative Pain:

• Most frequent complication after ambulatory surgery.
• Assessment: Visual Analog Scale (VAS), Numeric Rating Scale (NRS).
  • Discharge target: Pain score < 4/10.
• Management: Multimodal analgesia is key.
  • NSAIDs (e.g., Ketorolac 15-30mg IV/IM).
  • Paracetamol (1g IV/PO).
  • Opioids: Use sparingly (e.g., Tramadol 50mg, Fentanyl small doses).
  • Local/Regional: Nerve blocks, wound infiltration with local anesthetics.
• Prioritize early transition to effective oral analgesics.

Postoperative Nausea & Vomiting (PONV):

• High incidence; delays discharge, reduces satisfaction.
• Risk Assessment: Apfel Score (Female, Non-smoker, Hx PONV/Motion Sickness, Postop Opioids).
  • 0-1 factor: Low risk.
  • 2 factors: Moderate risk (use 1-2 antiemetics).
  • ≥3 factors: High risk (use ≥2 antiemetics, consider TIVA).
• Common Prophylaxis:
  • Ondansetron (4mg IV).
  • Dexamethasone (4-8mg IV with induction).
  • Aprepitant (40mg PO) for high-risk.
• Rescue Therapy: Use different class antiemetic (e.g., Droperidol 0.625mg).

⭐ Dexamethasone 4-8mg IV given at induction is effective for PONV prophylaxis and can also reduce pain by decreasing inflammation.

Airway & Neuro Niggles - Sore & Foggy

• Postoperative Sore Throat (POST)
  • Incidence: 10-30% (can reach 62%); Endotracheal Tube (ETT) > Laryngeal Mask Airway (LMA).
  • Causes: Laryngoscopy trauma, intubation, excessive cuff pressure (>25-30 cm H₂O), large tube size.
  • Prevention: Gentle airway manipulation, LMA if suitable, lidocaine (spray/cuff lubrication/IV), minimize cuff pressures.
  • Management: Reassurance, warm saline gargles, lozenges, NSAIDs. Typically resolves in 24-48 hours.
• Hoarseness/Dysphonia
  • Results from vocal cord irritation or edema.
  • Usually transient; persistent cases warrant further evaluation.
• Postoperative Cognitive Dysfunction (POCD)
  • Subtle, often transient decline in cognitive functions (e.g., memory, concentration).
  • Higher risk in elderly patients and after major or prolonged surgery.
  • Prevention: Consider regional anesthesia, use shorter-acting agents, maintain physiological stability (normoxia, normocapnia, normothermia, normoglycemia).
• Prolonged Drowsiness/Delayed Emergence
  • Causes: Residual effects of anesthetic agents (volatile agents, opioids, benzodiazepines), hypothermia, hypoglycemia, electrolyte imbalance.
  • Management: Supportive care (airway, oxygen), ensure normothermia, cautious use of reversal agents (e.g., naloxone, flumazenil) if indicated.
• Dizziness
  • Common; multifactorial (anesthetic agents, opioids, orthostatic hypotension, dehydration).
  • Management: Gradual mobilization, ensure adequate hydration.

⭐ High-Yield: Maintaining ETT/LMA cuff pressure <30 cm H₂O is crucial to minimize the incidence and severity of postoperative sore throat and reduce risk of tracheal mucosal injury.

Surgical & Systemic Setbacks - Leaks & Lags

Focuses on issues at the surgical site and systemic problems like urinary retention that can delay discharge or require further intervention.

• Surgical Site Complications (Leaks):

  • Bleeding/Hematoma:
    • Incidence: Low; varies by procedure (e.g., thyroid, breast).
    • Risk factors: Anticoagulants, specific surgery types.
    • Management: Local pressure, observation; rarely, re-operation.
  • Surgical Site Infection (SSI):
    • Rare in day-case surgery; aseptic technique is crucial.
    • Prophylactic antibiotics if indicated based on procedure and patient factors.
  • Wound Dehiscence: Very uncommon in ambulatory settings.

• Systemic Lags:

  • Postoperative Urinary Retention (POUR):
    • Definition: Inability to void despite a full bladder (typically bladder volume >500-600 mL on scan).
    • Incidence: 0.5-25%; ↑ risk with male gender, age >50 years, history of BPH, spinal/epidural anesthesia, opioids, anticholinergics, specific surgeries (e.g., inguinal hernia, anorectal).
    • 📌 Mnemonic: POUR - Prostate issues, Opioids/Anticholinergics, Urogenital/Anorectal surgery, Regional anesthesia.
    • Management:

    -   ⭐ > POUR is a leading cause of delayed discharge and unanticipated hospital admission after ambulatory surgery.
*   Deep Vein Thrombosis (DVT)/Pulmonary Embolism (PE):
    -   Low risk in most ambulatory surgery patients.
    -   Consider prophylaxis for high-risk individuals (e.g., history of VTE, thrombophilia, major orthopedic procedures, prolonged immobility).

High‑Yield Points - ⚡ Biggest Takeaways

• Postoperative Nausea and Vomiting (PONV) is the most frequent complication; key risks: female, history of PONV, non-smoker, use of volatiles/opioids.
• Pain at surgical site is common; multimodal analgesia is crucial.
• Prolonged drowsiness can delay discharge; careful monitoring needed.
• Sore throat is common after airway instrumentation (ETT/LMA).
• Dizziness and postural hypotension may occur, especially post-neuraxial block or dehydration.
• Urinary retention risk ↑ post-spinal anesthesia or urogenital surgery_