Question:
A child with a subaortic ventricular septal defect (VSD) develops progressive aortic regurgitation. Which principle best explains this phenomenon?
A child with a subaortic ventricular septal defect (VSD) develops progressive aortic regurgitation. Which principle best explains this phenomenon?
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Fluid Dynamics in Cardiology:
- Venturi effect: High velocity $\rightarrow$ Low pressure. Causes Aortic Cusp prolapse in VSD, and SAM (Systolic Anterior Motion) of the mitral valve in HOCM.
- Coandă effect: Jet hugging a wall. Explains eccentric jets in Atrial/Mitral regurgitation.
- Venturi effect: High velocity $\rightarrow$ Low pressure. Causes Aortic Cusp prolapse in VSD, and SAM (Systolic Anterior Motion) of the mitral valve in HOCM.
- Coandă effect: Jet hugging a wall. Explains eccentric jets in Atrial/Mitral regurgitation.
Updated On: Sep 3, 2026
- Coandă effect
- Venturi effect
- Laminar flow method
- Whirlpool effect
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The Correct Option is B
Solution and Explanation
Concept:
The development of Aortic Regurgitation (AR) in the setting of a subarterial or perimembranous subaortic Ventricular Septal Defect (VSD) is a classic hemodynamic complication explained by fluid dynamic principles.
Explanation:
• In a subaortic VSD, there is a high-velocity jet of blood shunting from the high-pressure left ventricle to the lower-pressure right ventricle during systole.
• This high-velocity jet passes immediately beneath the aortic valve leaflets (most commonly the right coronary cusp).
• According to Bernoulli's principle, an increase in the velocity of a fluid occurs simultaneously with a decrease in pressure. The specific phenomenon where a high-velocity fluid stream creates a localized zone of low pressure that draws in surrounding structures is known as the Venturi effect.
• This localized low-pressure "suction" effect physically pulls the adjacent aortic cusp downward into the VSD.
• Over time, this constant suction leads to elongation, prolapse, and structural deformity of the cusp, culminating in progressive aortic regurgitation.
• The Coandă effect (Option A) is the tendency of a fluid jet to stay attached to a convex surface (such as a mitral regurgitation jet hugging the atrial wall) and does not explain VSD-induced cusp prolapse.
Final Answer:
The Venturi effect creates a localized low-pressure zone due to the high-velocity VSD shunt, causing the aortic valve cusp to prolapse and resulting in progressive aortic regurgitation.
The development of Aortic Regurgitation (AR) in the setting of a subarterial or perimembranous subaortic Ventricular Septal Defect (VSD) is a classic hemodynamic complication explained by fluid dynamic principles.
Explanation:
• In a subaortic VSD, there is a high-velocity jet of blood shunting from the high-pressure left ventricle to the lower-pressure right ventricle during systole.
• This high-velocity jet passes immediately beneath the aortic valve leaflets (most commonly the right coronary cusp).
• According to Bernoulli's principle, an increase in the velocity of a fluid occurs simultaneously with a decrease in pressure. The specific phenomenon where a high-velocity fluid stream creates a localized zone of low pressure that draws in surrounding structures is known as the Venturi effect.
• This localized low-pressure "suction" effect physically pulls the adjacent aortic cusp downward into the VSD.
• Over time, this constant suction leads to elongation, prolapse, and structural deformity of the cusp, culminating in progressive aortic regurgitation.
• The Coandă effect (Option A) is the tendency of a fluid jet to stay attached to a convex surface (such as a mitral regurgitation jet hugging the atrial wall) and does not explain VSD-induced cusp prolapse.
Final Answer:
The Venturi effect creates a localized low-pressure zone due to the high-velocity VSD shunt, causing the aortic valve cusp to prolapse and resulting in progressive aortic regurgitation.
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