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in Medical Academics Questions by Medical Officer (1.8k points)
In Cyanotic spells in congenital heart diseases, patient gets relieved when in sitting position or squatting position.
How does it help?
What is the mechanism and logic behind it?

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1 Answer

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by Doctor of Medicine (9.9k points)
In Tetralogy of Fallot, the Right Ventricular pressure exceeds the Left Ventricular pressure, resulting in a right to left shunt. Squatting increases systemic vascular resistance which causes Left Ventricular pressure to temporarily rise above Right Ventricular pressure, thereby producing a temporary reversal of the shunt. Therefore, when the patient squats during the cyanotic spells, more blood enters the lungs for oxygenation.
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nice answer, thanks
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