Patent ductus arteriosus Flashcards
A PDA joins what?
The aorta and the pulmonary artery
Why would a PDA animals pulse be bounding/ hyperkinetic
The heart’s systolic pressure has increased and diastolic pressure dec (blood is being diverted to lungs, decreasing TPR) causing large pressure waves with each pulse
Why does diastolic pressure decrease with a PDA?
PDA causes an extra escape route for the blood, meaning TPR is decreased, decreasing diastolic pressure
What causes a murmur in the case of PDA?
turbulent blood flow through PDA
Mitral valve murmur due to overload on L heart
What diagnostic modalities might we use to diagnose a PDA? What would we look for?
Radiography- Dilated LA, LV, arterial aneurysm
Echocardiography- Dilated LA, LV Dilated aorta Trubulence b/w LA, LV mitral valve incompetence actual PDA
Describe L to R shunting
PDA located between aorta and pulmonary artery. With LV systole, blood is pumped out of aorta but some is diverted back to lungs, then ends back in LA.
What are some secondary effects of a PDA?
Inc blood viscosity
Inc risk of thrombus
Pulmonary hypertension
Mitral valve regurgitation
Why does blood viscosity increase with PDA?
INC RBC production in response to hypoxia –> polycythaemia
