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VSD Size Ratio Index Calculator
VSD Size Ratio Index: Explanation and Clinical Context The Ventricular Septal Defect (VSD) Size Ratio Index is calculated as the ratio of the VSD diameter to the aortic annulus diameter measured on echocardiography. This ratio provides a normalized, dimensionless parameter that allows for interindividual comparison regardless of patient size or age. A VSD/Aortic diameter ratio below 0.3 typically indicates a small de