Differential cyanosis.. - tet

[ArchivalUser]

..in a child limited to lower extremities. What type of CV defect does the child have and the patho of the cyanosis?

[ArchivalUser]

caused by PDA --unoxygenated blood entering the aorta below the subclavian artery....

[ArchivalUser]

It is patent ductus arteriosus after shunt reversal, ...the aorta proximal to PDA is supplying oxygenated blood...below PDA, deoxygenated blood from PA mixed with aortic blood..leading to extremities cynosis only..upper extremities perfectly ok..........

[ArchivalUser]

good job, and what will COA adult type cause?

[ArchivalUser]

decrease the BP in lower extremities ,dec.in renal blood flow,claudication...
collaterals--AIA/PIA
SEA/IEA.....

[ArchivalUser]

correct and exercise intolerance of LEs but no cyanosis

[ArchivalUser]

...because it is proximal to left subclavian artery...asynchronous radial pulses in left and right upper extremities

[ArchivalUser]

yes they have HTN becoz of RAA

ok which one is opposite low pressure in upper extremities..