A 52-year-old man from Delhi presents to a community health centre for cardiovascular risk assessment as part of a population screening programme. He is asymptomatic with no prior cardiac history. His blood pressure is 138/88 mmHg, BMI 28 kg/m², and fasting blood glucose 110 mg/dL. To determine his 10-year absolute cardiovascular risk and guide intensity of preventive therapy, which investigation is most appropriate?

Explanation

## Investigation of Choice for Cardiovascular Risk Stratification ### Clinical Context The patient is asymptomatic with borderline hypertension, overweight status, and impaired fasting glucose. Risk stratification in primary prevention requires a validated tool that incorporates major modifiable and non-modifiable risk factors. ### Why Framingham Risk Score is Correct **Key Point:** The Framingham Risk Score (FRS) is the gold standard epidemiological tool for estimating 10-year absolute cardiovascular risk in asymptomatic individuals without prior coronary disease [cite:Park 26e Ch 5]. **High-Yield:** FRS incorporates: - Age, sex, smoking status - Systolic blood pressure (treated and untreated) - Total cholesterol and HDL cholesterol - Diabetes mellitus status It provides a percentage risk estimate that directly guides intensity of lipid-lowering and antihypertensive therapy per guidelines. ### Indian Context **Clinical Pearl:** The WHO/ISH risk prediction charts adapted for South Asian populations are derived from Framingham and similar cohorts. In India, the Framingham-based approach remains the recommended first-line risk calculator in primary care and community screening [cite:Park 26e Ch 5]. ### Comparison with Other Investigations | Investigation | Role | Limitation in This Context | |---|---|---| | **Framingham Risk Score** | First-line risk stratification in asymptomatic individuals | Requires lipid profile (not yet done) | | **CAC scoring** | Reclassification of intermediate-risk patients; refines risk in borderline cases | Radiation exposure; not first-line in primary screening; more useful if FRS intermediate | | **Exercise stress test** | Diagnosis in symptomatic patients or high-risk asymptomatic; prognosis post-MI | Patient is asymptomatic; not indicated for risk assessment alone | | **cIMT measurement** | Research tool; subclinical atherosclerosis detection; not routine in clinical practice | Not validated for routine risk stratification; not part of standard guidelines | ### Algorithm for Risk Assessment ```mermaid flowchart TD A[Asymptomatic adult for CVD risk assessment]:::outcome --> B[Calculate Framingham Risk Score]:::action B --> C{Obtain lipid profile + clinical data}:::decision C -->|10-year risk < 10%| D[Low risk: lifestyle modification]:::action C -->|10-year risk 10-20%| E[Intermediate risk: consider CAC or cIMT for reclassification]:::decision C -->|10-year risk > 20%| F[High risk: initiate statin + antihypertensive]:::action E -->|CAC = 0| G[Reassure, lifestyle only]:::outcome E -->|CAC > 0| H[Treat as high risk]:::action ``` **Mnemonic:** **FRS** = **F**irst-line **R**isk **S**tratification in primary prevention.