13 Questions
What is the most common type of atrial septal defect (ASD)?
Ostium secundum defects
What happens during anatomical closure of the ductus arteriosus postnatally?
Smooth muscle contracts
What is the main cause of atrial septal defects (ASDs) involving the failure of fusion between septum primum and secondum?
Excessive resorption of septum primum
Which part of the interventricular septum is formed by the medial walls of expanding ventricles?
Muscular part
What characterizes a 'machine-like' murmur in a patient with pulmonary hypertension?
Systolic and diastolic components
Which type of closure occurs prenatally in the ductus arteriosus?
Physiological closure
What closes the interventricular foramen superiorly in the interventricular septum?
Muscular walls of ventricles
What is the function of the ductus arteriosus in foetal circulation?
Allow blood to bypass the foetal lungs
Which structure grows from the roof of the atrium into the lumen and forms ostium primum?
Sickel shaped septum primum
What happens when the ostium primum fails to close properly above the atrioventricular valves?
Ejection systolic murmur is heard
What is the risk associated with an ostium primum defect just above the atrioventricular valves?
Right-to-left shunting of blood
During post-natal circulation, what happens to the pulmonary vascular resistance (PVR) and arterial pressures?
PVR decreases and arterial pressures decrease
What is a characteristic of acyanotic heart diseases?
Asymptomatic presentation in most cases
Learn about common heart defects including Ostium secundum defects and the closure of Ductus Arteriosus. Understand the causes, pre-natal and post-natal processes, and complications such as Patent Ductus Arteriosus (PDA).
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