Patient Selection for Ambulatory Surgery

Intro & Benefits - Day‑Case Basics

• Ambulatory Surgery (Day-case/Same-day surgery): Patients admitted, operated, and discharged on the same calendar day, typically within 23 hours.
• Core Aim: Provide safe, high-quality, cost-effective surgical care without overnight hospitalisation.
• Key Advantages:
  • Reduced risk of hospital-acquired infections (HAIs).
  • Lower overall costs for patients and healthcare systems.
  • Enhanced patient comfort, convenience, and satisfaction.
  • Improved hospital bed availability for complex/emergency cases.
  • Quicker recovery and return to daily life.

⭐ Early ambulation post-ambulatory surgery is a key factor in reducing postoperative complications like deep vein thrombosis (DVT).

Patient Assessment - Fit for Fast‑Track

Crucial for day-case success: physiological stability & low post-op risk.

• ASA Status:
  • ASA I & II: Ideal.
  • ASA III: Stable, well-controlled systemic disease.
  • ASA IV: Generally unsuitable.
• Age & BMI:
  • Extremes (infants < 3 mo, elderly > 80 yrs): Careful evaluation.
  • BMI > 35-40 kg/m²: ↑Risk. BMI > 40-45 kg/m² (morbid obesity): Often unsuitable.
• Airway & OSA:
  • Airway: Mallampati, difficult intubation history.
  • OSA: STOP-BANG score ≥ 3 (high risk) may need inpatient care.

    ⭐ Severe OSA or a high STOP-BANG score often necessitates extended postoperative monitoring beyond typical ambulatory discharge criteria.

• Key Comorbidities:
  • CVS: Stable HTN/CAD. No recent MI (< 3-6 mo).
  • Resp: Stable asthma/COPD. No active infection.
• Procedure Factors: < 90 min duration, minimal blood loss, low PONV risk.
• Social Support: Essential (responsible adult escort, home care, phone access).

Systemic Co‑morbidities - Health Check Hurdles

Focus: Stability & control of pre-existing conditions.

• Cardiovascular:
  • Hypertension: Controlled (e.g., BP < 160/100 mmHg).
  • IHD: Stable angina; MI > 3-6 months (or > 6 wks post-PCI, low-risk surgery).
  • CHF: NYHA Class I-II, EF > 40%, stable.
  • Arrhythmias: Rate-controlled, asymptomatic.
• Respiratory:
  • Asthma/COPD: Optimized, no recent exacerbation (< 4-6 wks). FEV1 > 60% predicted.
  • OSA: Diagnosed, on CPAP if indicated. Consider STOP-BANG. High-risk may need inpatient care.
• Endocrine:
  • Diabetes: HbA1c < 8% (ideally < 7%). Fasting BS < 180-200 mg/dL. No recent DKA/HHS.
  • Thyroid disease: Euthyroid state.
• Renal/Hepatic:
  • CKD: Stable. Dialysis patients if schedule permits & no acute issues.
  • Liver Disease: Child-Pugh Class A, stable. No acute hepatitis.
• Neurological:
  • Seizure disorder: Well-controlled, no recent seizures.
  • Stroke/TIA: Stable, minimal residual deficit.
• Hematological:
  • Anemia: Hb > 8-10 g/dL (procedure & patient dependent).
  • Coagulopathy: Corrected or managed.

⭐ Patients with severe systemic disease (e.g., ASA Class III poorly controlled, ASA Class IV) are generally NOT candidates for ambulatory surgery.

Procedure & Social Factors - Surgery & Support System

• Surgical Profile:
  • Duration: Typically <90 mins; may extend for selected procedures.
  • Nature: Minimally invasive, minimal physiological impact expected.
  • Anticipated Post-Op Course:
    • Pain: Manageable with oral analgesics.
    • PONV: Low risk of PONV.
    • Bleeding: Minimal risk, no complex drains.
    • Monitoring: No specialized care needed.
• Essential Social Support:
  • Crucial: Responsible adult for transport & continuous 24h care.
  • Communication: Reliable telephone access.
  • Home: Safe, comfortable environment for recovery.
  • Emergency Plan: Access to medical facility (e.g., <1 hr travel).
  • Patient: Understands & agrees to post-op instructions.

⭐ A responsible adult escort for 24 hours post-discharge is a critical safety requirement for ambulatory surgery.

High‑Yield Points - ⚡ Biggest Takeaways

• ASA I & II patients are ideal; selected ASA III with stable systemic disease.
• Age is not an absolute contraindication; consider physiological status.
• BMI < 40 kg/m² generally preferred; higher BMI increases risk.
• Obstructive Sleep Apnea (OSA): mild to moderate, well-controlled, with CPAP.
• Procedure duration typically < 90 minutes and minimal postoperative pain.
• Essential: responsible adult for escort and 24-hour post-op care.
• Crucial: patient motivation and understanding of post-operative instructions.