Left to Right Shunts and their Calculation Ghada ... - CardioEgypt.com
Left to Right Shunts and their Calculation Ghada ... - CardioEgypt.com
Left to Right Shunts and their Calculation Ghada ... - CardioEgypt.com
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3/18/2013<br />
Shunt Measurement:<br />
Effective Pulmonary Blood Flow<br />
• Effective Pulmonary Blood<br />
Flow: flow that would be<br />
present if no shunt were<br />
present<br />
• Requires<br />
– MV = PA saturation<br />
– PV – PA = PV - MV<br />
PBF<br />
Effective Pulmonary<br />
Blood Flow<br />
=<br />
O 2 consumption<br />
(Pv – MV O 2 ) x 10<br />
=<br />
O 2 consumption<br />
(Pv – Pa O 2 ) x 10<br />
Bashore, TM. Congenital Heart Disease in Adults. The Measurement of Intracardiac <strong>Shunts</strong>. In: CATHSAP II.<br />
Bethesda: American College of Cardiology, 2001.<br />
Shunt Detection & Measurement<br />
<strong>Left</strong>-<strong>to</strong>-<strong>Right</strong> Shunt<br />
• <strong>Left</strong> <strong>to</strong> right shunt: >> in step-up<br />
in O 2 between MV <strong>and</strong> PA<br />
• Shunt is the difference between<br />
pulmonary flow measured <strong>and</strong><br />
what it would be in the absence of<br />
shunt (EPBF)<br />
• Systemic Blood Flow = EPBF<br />
<strong>Left</strong>-<strong>Right</strong> Shunt = Pulmonary Blood Flow – Effective Blood Flow<br />
O 2 consumption<br />
=<br />
(PvO 2 – Pa O 2 ) x 10<br />
–<br />
O 2 consumption<br />
(PvO 2 – MVO 2 ) x 10<br />
Bashore, TM. Congenital Heart Disease in Adults. The Measurement of Intracardiac <strong>Shunts</strong>. In: CATHSAP II.<br />
Bethesda: American College of Cardiology, 2001.<br />
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