How is left ventricular wall thickness measured clinically, and what threshold indicates hypertrophy?

How is left ventricular wall thickness measured clinically, and what threshold indicates hypertrophy?

• A. Measured at end-diastole in apical four-chamber view; wall thickness >11 mm is abnormal
• B. Measured at end-diastole in parasternal long-axis view; wall thickness >11 mm is abnormal
• C. Measured at end-systole in parasternal long-axis view; wall thickness >11 mm is abnormal
• D. Measured at end-diastole in short-axis view; wall thickness >11 mm is abnormal

Answer: (B)

Left ventricular wall thickness is assessed by echocardiography in end-diastole using the parasternal long-axis view. The clinician places calipers perpendicular to the wall to measure the thickness of the interventricular septum and the posterior wall. This timing is used because the walls are measured when the ventricle is relaxed and the chamber size is at its baseline, providing a consistent and reproducible value. A wall thickness greater than about 11 millimeters is considered abnormal and indicates hypertrophy, often due to conditions like systemic hypertension or aortic valve disease. The parasternal long-axis view is preferred because it offers a clear, straight path to measure the walls accurately; measuring in systole would overestimate thickness, and while short-axis views can assess thickness, the standard reference and measurement approach rely on end-diastolic assessment in the long-axis view.

Left ventricular wall thickness is assessed by echocardiography in end-diastole using the parasternal long-axis view. The clinician places calipers perpendicular to the wall to measure the thickness of the interventricular septum and the posterior wall. This timing is used because the walls are measured when the ventricle is relaxed and the chamber size is at its baseline, providing a consistent and reproducible value. A wall thickness greater than about 11 millimeters is considered abnormal and indicates hypertrophy, often due to conditions like systemic hypertension or aortic valve disease. The parasternal long-axis view is preferred because it offers a clear, straight path to measure the walls accurately; measuring in systole would overestimate thickness, and while short-axis views can assess thickness, the standard reference and measurement approach rely on end-diastolic assessment in the long-axis view.