A 58-year-old man with a 10-year history of hypertension (currently on amlodipine and lisinopril) and type 2 diabetes mellitus (on metformin) presents for elective laparoscopic cholecystectomy. On preoperative assessment, his blood pressure is 138/86 mmHg, heart rate 78/min, and fasting blood glucose 156 mg/dL. He denies chest pain, dyspnea, or palpitations. Physical examination is unremarkable. Which investigation is most appropriate to assess his cardiac risk before surgery?

Explanation

## Cardiac Risk Assessment in ASA Classification ### Clinical Context This patient is ASA Class II (mild systemic disease) with controlled hypertension and diabetes. He is undergoing a low-to-intermediate risk surgical procedure (laparoscopic cholecystectomy) with no active cardiac symptoms. ### Investigation of Choice: Resting 12-Lead ECG **Key Point:** A baseline resting 12-lead ECG is the standard first-line investigation for all patients ≥40 years undergoing elective surgery, particularly those with cardiovascular risk factors (hypertension, diabetes). It is: - Non-invasive and readily available - Establishes baseline rhythm and identifies silent ischemia, arrhythmias, or conduction abnormalities - Guides further workup if abnormalities are detected - Recommended by ACC/AHA and Indian Society of Anaesthesiologists guidelines **High-Yield:** According to pre-operative cardiac risk assessment algorithms, a resting ECG is obtained in all patients with: - Age ≥40 years - Presence of risk factors (diabetes, hypertension, smoking, obesity) - Undergoing intermediate-risk surgery ### Decision Algorithm for Cardiac Workup ```mermaid flowchart TD A[Patient ≥40 years with risk factors]:::outcome --> B[Obtain resting 12-lead ECG]:::action B --> C{ECG abnormal or symptoms?}:::decision C -->|No| D[Proceed with surgery]:::action C -->|Yes| E{High-risk surgery?}:::decision E -->|No| F[Proceed; optimize medications]:::action E -->|Yes| G[Consider stress test or echo]:::action G --> H[Risk stratify further]:::outcome ``` **Clinical Pearl:** In this case, the patient has no anginal symptoms, normal exercise tolerance (implied by daily activities), and is undergoing low-risk surgery. A resting ECG suffices; advanced imaging is not indicated unless ECG reveals ischemic changes or arrhythmias. **Mnemonic: BASIC ECG** — **B**aseline for all ≥40 years, **A**rrhythmia detection, **S**ilent ischemia screening, **I**nfarction history, **C**onduction abnormalities. ### Why Advanced Imaging Is Not First-Line | Investigation | Indication | Rationale for Not Using Here | |---|---|---| | Resting ECG | All ≥40 years + risk factors | **First-line; establishes baseline** | | Transthoracic echo | Suspected LV dysfunction, valvular disease, murmur | No clinical signs; not indicated | | Stress echo | High-risk surgery + abnormal ECG or symptoms | Low-risk surgery; asymptomatic | | Coronary angiography | Acute coronary syndrome or uncontrolled angina | Invasive; reserved for therapeutic intent | **Warning:** Ordering echocardiography or stress testing without an abnormal resting ECG or active symptoms is unnecessary, delays surgery, and increases costs without improving outcomes in asymptomatic patients undergoing low-risk procedures.