A 48-year-old woman from Mumbai with a 10-year history of hypertension (BP 145/92 mmHg on amlodipine) and dyslipidaemia (LDL 145 mg/dL on atorvastatin 20 mg daily) attends a preventive cardiology clinic. She is asymptomatic with no prior cardiac events. To detect subclinical left ventricular dysfunction and guide intensification of therapy, which investigation is most appropriate?

Explanation

## Investigation of Choice for Subclinical Cardiac Dysfunction in Hypertension ### Clinical Context The patient has long-standing hypertension and dyslipidaemia, both major risk factors for left ventricular hypertrophy (LVH) and diastolic dysfunction. She is asymptomatic but at risk for occult cardiac remodelling. The goal is to detect structural or functional abnormalities that would warrant intensified antihypertensive therapy. ### Why Echocardiography is Correct **Key Point:** Transthoracic echocardiography is the gold standard non-invasive investigation for detecting left ventricular hypertrophy, systolic dysfunction, and diastolic dysfunction in hypertensive patients [cite:Harrison 21e Ch 242]. **High-Yield:** Echocardiography provides: - Left ventricular mass index (LVMI) — detects LVH, a marker of target organ damage - Left ventricular ejection fraction (LVEF) — assesses systolic function - Diastolic parameters (E/A ratio, tissue Doppler) — detects diastolic dysfunction, precursor to heart failure - Left atrial size — marker of chronic hypertension and diastolic dysfunction - Valvular assessment — detects secondary changes **Clinical Pearl:** In hypertensive patients with LVH on echo, intensification of antihypertensive therapy (e.g., adding ACE inhibitor or beta-blocker) is indicated, as LVH is an independent predictor of cardiovascular events and mortality [cite:Park 26e Ch 5]. ### Why Other Investigations Are Suboptimal | Investigation | Sensitivity for LVH/Dysfunction | Limitation | |---|---|---| | **Echocardiography** | High for LVH, systolic and diastolic dysfunction | Gold standard; non-invasive; no radiation | | **Resting ECG** | Low (~50%) for LVH detection; poor sensitivity for diastolic dysfunction | Insensitive; Sokolow-Lyon criteria have poor specificity; cannot assess function | | **Coronary angiography** | Assesses coronary anatomy only; not for functional assessment | Invasive; reserved for symptomatic CAD or high-risk ischemia; not indicated in asymptomatic patient | | **Holter monitoring** | Detects arrhythmias; no structural assessment | Not indicated for LVH or dysfunction detection; useful only if palpitations or syncope present | ### Echocardiographic Findings in Hypertension ```mermaid flowchart TD A[Hypertensive patient, asymptomatic]:::outcome --> B[Transthoracic echocardiography]:::action B --> C{LVH present?}:::decision C -->|Yes, LVEF normal| D[Diastolic dysfunction likely]:::outcome C -->|Yes, LVEF reduced| E[Systolic dysfunction: HFrEF or HFmrEF]:::urgent C -->|No| F[Continue current therapy, reassess in 2-3 years]:::action D --> G[Intensify antihypertensive: add ACE-I or beta-blocker]:::action E --> H[Urgent cardiology referral; consider ICD/CRT if indicated]:::urgent ``` **Mnemonic:** **ECHO** = **E**ssential for **C**ardiac **H**ypertrophy **O**bservation in hypertensive patients.