A 52-year-old man with hypertension presents with palpitations and dyspnea. Echocardiography shows left ventricular hypertrophy (LVH) with diastolic dysfunction. Which of the following is the most common hemodynamic consequence during the isovolumetric relaxation phase of the cardiac cycle in this patient?

## Diastolic Dysfunction in LVH: Isovolumetric Relaxation Phase **Key Point:** In left ventricular hypertrophy secondary to hypertension, the most common hemodynamic abnormality during isovolumetric relaxation is **impaired relaxation** leading to elevated LVEDP, reflecting diastolic dysfunction. ### Pathophysiology of LVH-Related Diastolic Dysfunction #### Structural Changes 1. Myocardial hypertrophy increases wall stiffness 2. Increased collagen deposition in the interstitium 3. Reduced compliance of the left ventricle 4. Abnormal calcium handling and slower calcium reuptake #### Isovolumetric Relaxation Phase (IVR) During IVR (between aortic valve closure and mitral valve opening): - Ventricular volume remains constant - Pressure falls from systolic to diastolic levels - In normal hearts: LVEDP ≈ 5–12 mmHg - In LVH with diastolic dysfunction: LVEDP ≥ 15–20 mmHg **High-Yield:** Elevated LVEDP is transmitted retrograde to the left atrium and pulmonary veins, causing pulmonary congestion and dyspnea — the cardinal symptom in this patient. ### Hemodynamic Cascade ```mermaid flowchart TD A[Chronic Hypertension]:::action --> B[Left Ventricular Hypertrophy]:::outcome B --> C[Increased Wall Stiffness]:::outcome C --> D[Impaired Relaxation in IVR Phase]:::outcome D --> E[Elevated LVEDP]:::urgent E --> F[Retrograde Pressure to LA/PV]:::urgent F --> G[Pulmonary Congestion]:::outcome G --> H[Dyspnea, Palpitations]:::outcome ``` **Clinical Pearl:** Patients with LVH-related diastolic dysfunction often have a restrictive filling pattern on Doppler echocardiography (E/A ratio >2, short deceleration time), confirming the diagnosis. ### Why LVEDP is the Most Common Consequence - Occurs in nearly 100% of LVH patients with diastolic dysfunction - Directly responsible for symptoms (pulmonary congestion) - Measurable on cardiac catheterization and inferred from echocardiography - Guides therapeutic decisions (diuretics, ACE inhibitors, beta-blockers)