SHUNTING OF BLOOD IN THE HEART

Question 1

systemic venous

LEFT TO RIGHT CARDIAC SHUNT

Answer 1

• RA

- PaO2= 40

Question 2

pulmonary venous

LEFT TO RIGHT CARDIAC SHUNT

Answer 2

• LA

- PaO2= 100

Question 3

pulmonary arterial

LEFT TO RIGHT CARDIAC SHUNT

Answer 3

• RV

- PaO2= 40

Question 4

systemic arterial

LEFT TO RIGHT CARDIAC SHUNT

Answer 4

• LV

- PaO2= 100

Question 5

ATRIAL SEPTAL DEFECT (ASD)

Answer 5

systemic arterial PO2= NO CHANGE
Right atrial PO2= INCREASE
Right ventricular PO2= INCREASE
Pulmonary atrial PO2= INCREASE
Pulmonary blood flow= INCREASE
Pulmonary arterial pressure= INCREASE
due to recirculation of OXYGENATED BLOOD

Question 6

VENTRICULAR SEPTAL DEFECT (VSD)

Answer 6

systemic arterial PO2= NO CHANGE
Right atrial PO2= NO CHANGE due to the defect is in ventricles
Right ventricular PO2= INCREASE
Pulmonary atrial PO2=INCREASE
Pulmonary blood flow=INCREASE shunt from RV to LV more flow into the pulmonary artery more flow into the lung
Pulmonary arterial pressure=INCREASE pulmonary markings in CXR, may lead to pulmonary hypertension

Question 7

PATENT DUCTUS ARTERIOSUS (newborn)
connects pulmonary artery into the aorta
HIGH TO LOW PRESSURE

Answer 7

systemic arterial PO2= NO CHANGE
Right atrial PO2= NO CHANGE
Right ventricular PO2= NO CHANGE
Pulmonary atrial PO2= INCREASE due to reversal of flow from aorta to pulmonary artery (OXYGENATED BLOOD)
Pulmonary blood flow= INCREASE
Pulmonary arterial pressure= INCREASE

Question 8

END STAGE OF PDA (less common)
most commonly in VSD AND ASD
pregnancy as a complication

Answer 8

• Eisenmenger syndrome
• from left to right to right to left shunt
• cyanotic heart defect characterized by long standing intracardiac shunt