What does Diffuse PMI correlate to?

What does Diffuse PMI correlate to?

• A. Chronic Volume Overload With an Increased Pre-Load
• B. Acute Dehydration
• C. Ischemic Heart Disease
• D. Reduced Afterload

Answer: (A)

Diffuse PMI appears when the left ventricle is enlarged and hyperdynamic from long-standing volume overload, so the impulse is felt over a wider area rather than as a single localized tap. This reflects increased preload—the ventricle is stretched more during filling, leading to greater contraction and a broader apical impulse. Acute dehydration lowers preload, making the impulse harder to feel and not diffuse. Ischemic heart disease can alter the impulse with LV dysfunction or regional wall motion abnormalities, but the classic diffuse apical impulse specifically tracks with chronic volume overload and increased preload, not with reduced afterload or dehydration.

Diffuse PMI appears when the left ventricle is enlarged and hyperdynamic from long-standing volume overload, so the impulse is felt over a wider area rather than as a single localized tap. This reflects increased preload—the ventricle is stretched more during filling, leading to greater contraction and a broader apical impulse.

Acute dehydration lowers preload, making the impulse harder to feel and not diffuse. Ischemic heart disease can alter the impulse with LV dysfunction or regional wall motion abnormalities, but the classic diffuse apical impulse specifically tracks with chronic volume overload and increased preload, not with reduced afterload or dehydration.