Contrast dilated cardiomyopathy with hypertrophic cardiomyopathy in terms of ventricular geometry and systolic/diastolic function.

Contrast dilated cardiomyopathy with hypertrophic cardiomyopathy in terms of ventricular geometry and systolic/diastolic function.

• A. DCM: dilated ventricle with thinning walls and systolic dysfunction; HCM: thickened walls with small cavity, diastolic dysfunction, with myocyte disarray.
• B. DCM: thick-walled ventricle; HCM: dilated ventricle with systolic dysfunction.
• C. DCM: dilated ventricle with thinning walls, systolic dysfunction; HCM: thickened walls with small cavity, diastolic dysfunction, with myocyte disarray.
• D. DCM and HCM both have dilated ventricles.

Answer: (C)

When you compare dilated cardiomyopathy and hypertrophic cardiomyopathy, the crucial distinction is how the ventricle’s geometry relates to its function in systole and diastole. In dilated cardiomyopathy, the ventricle becomes enlarged and its walls thin out, leading to impaired systolic contraction and reduced ejection fraction. In hypertrophic cardiomyopathy, the walls are thickened, the left ventricular cavity becomes small, and the heart’s compliance is reduced, causing diastolic dysfunction; myocytes often show disarray, which is a histologic hallmark of HCM. The option that aligns with these patterns states that the dilated ventricle has thinning walls with systolic dysfunction, while the hypertrophied ventricle has a small cavity with diastolic dysfunction and myocyte disarray.

When you compare dilated cardiomyopathy and hypertrophic cardiomyopathy, the crucial distinction is how the ventricle’s geometry relates to its function in systole and diastole. In dilated cardiomyopathy, the ventricle becomes enlarged and its walls thin out, leading to impaired systolic contraction and reduced ejection fraction. In hypertrophic cardiomyopathy, the walls are thickened, the left ventricular cavity becomes small, and the heart’s compliance is reduced, causing diastolic dysfunction; myocytes often show disarray, which is a histologic hallmark of HCM. The option that aligns with these patterns states that the dilated ventricle has thinning walls with systolic dysfunction, while the hypertrophied ventricle has a small cavity with diastolic dysfunction and myocyte disarray.