CAUSES OF CYANOSIS IN ASD??

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Causes of cyanosis in ASD include large ASD with equalization of LA & RA pressure, ASD with associated valvar pulmonic stenosis. IVC blood can stream into LA by hitting preferentially the lower part of IAS(inter atrial septum) thus producing right-to- left shunt & cyanosis.
Right. In asd with associated valvular lession we should say it to be severe ps to the extent that it causes reversal of lt to rt shunt. All asds with valvular ps are not cyanotic. Asds normally are also associated with valvular ps which will be acyanotic.
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