Cardiac risk assessment

Initial Assessment - First Steps

• History & Physical (H&P): Identify cardiac symptoms (e.g., chest pain, dyspnea on exertion, syncope) and establish baseline cardiovascular status.
• Baseline Electrocardiogram (ECG): For all patients with at least one clinical risk factor or undergoing intermediate-to-high-risk surgery.
• Functional Capacity (METs): Crucial for risk stratification.
  • Metabolic Equivalent (MET): 1 MET = O₂ consumption at rest.
  • Key Question: Can the patient perform activities ≥ 4 METs?
    • Examples: Climb a flight of stairs, walk up a hill, or do heavy housework.

for various physical activities)

⭐ The inability to perform 4 METs of activity is a strong independent predictor of postoperative cardiopulmonary complications.

Clinical Predictors - Spotting Trouble

Based on the ACC/AHA guidelines, clinical risk factors are categorized to estimate perioperative cardiac risk.

RCRI Score - Quantifying Danger

• 6 Independent Predictors:
  • High-risk surgery (suprainguinal vascular, intraperitoneal, intrathoracic)
  • History of Ischemic Heart Disease
  • History of Congestive Heart Failure
  • History of Cerebrovascular Disease
  • Preoperative insulin use
  • Preoperative creatinine >2.0 mg/dL

📌 Mnemonic: 'C-HIC-HD' (Creatinine, HF, Ischemic HD, CVA, High-risk surgery, Diabetes-insulin).

⭐ An RCRI score ≥2 suggests high cardiac risk; consider further non-invasive testing if it will change management.

Management Pathway - The Algorithm

This decision tree, based on the 2014 ACC/AHA guidelines, provides a stepwise approach to perioperative cardiac management for patients undergoing non-cardiac surgery.

⭐ Beta-blockers should be continued in patients already taking them. However, avoid initiating beta-blockers on the day of surgery for beta-blocker-naïve patients, as this has been linked to an increased risk of hypotension, stroke, and mortality.

High-Yield Points - ⚡ Biggest Takeaways

• The Revised Cardiac Risk Index (RCRI) is the primary tool for predicting major adverse cardiac events (MACE).
• Key predictors include a history of ischemic heart disease, heart failure, stroke/TIA, diabetes requiring insulin, and creatinine >2.0 mg/dL.
• Functional capacity <4 METs (e.g., unable to climb two flights of stairs) is a major independent risk factor.
• Elevated preoperative BNP/NT-proBNP strongly predicts postoperative cardiac complications.
• Continue chronic beta-blockers and statins; do not initiate beta-blockers acutely before surgery.