ASD Flow across the defect in restrictive defect

ASD Flow across the defect in restrictive defect is determined largely by

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[A] Size of the ASD
[B] Ventricular compliance
[C] Atrial compliance
[D] Ventricular afterload

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ASD Flow across the defect

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1. Size of the ASD itself helps to determine the volume of shunting.
2. If the ASD is large, the defect creates little or no resistance to flow. Blood flow across the defect in diastole is determined entirely by the relative properties of the ventricles as above.
3. With a smaller, restrictive defect, blood flow is limited by the resistance of the ASD itself, no matter how large the difference in ventricular compliance.

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