Pathology Flashcards
Presents with early cyanosis, often diagnosed prenatally or immediately after birth requiring urgent surgical treatment or maintenance of PDA
Right-to-left shunts
Types of right-to-left shunts
Truncus arteriosus (1 vessel) Transposition (2 vessel) Tricuspid atresia (3 vessel) Tetralogy of Fallot (4 vessel) TAPVR (5 letters in name)
Fails to divide into pulmonary trunk and aorta due to lack of aorticopulmonary septum formation
Truncus arteriosus
Defect that usually accompanies truncus arteriosus
VSD
Anatomic anomaly where the aorta arises from the right ventricle and the pulmonary artery from the left ventricle leading to separation of systemic and pulmonary circulations
Transposition of the Great vessels
Required in transposition of the great vessels to maintain life
Shunt (VSD, PDA, or patent foramen ovale)
Cause of transposition of great vessels
Failure of aorticopulmonary septum to spiral
Complication of truncus arteriosus
Fluid overload leading to heart failure
Chromosomal abnormality associated with truncus arteriosus
22q11 deletion (DiGeorge syndrome)
Risk factors associated with transposition of great vessels
Diabetes, rubella, poor nutrition, alcohol, age > 40 years
Anatomic anomaly that causes hypoplastic RV requiring ASD or VSD for viability
Tricuspid atresia
What is tricuspid atresia
Absence of tricuspid valve
Most common cause of early childhood cyanosis and caused by anterosuperior displacement of the infundibular system
Tetralogy of Fallot
Most important determinant for prognosis in Tetralogy of Fallot
Pulmonary infundibular stenosis
CXR finding in tetralogy of Fallot
Boot-shaped heart
Conditions found in tetralogy of Fallot
Pulmonary infundibular stenosis
Right ventricular hypertrophy
Overriding aorta
VSD
How does squatting improve cyanosis in tetralogy of Fallot
Increases SVR and decreases right-to-left shunt
Pulmonary veins fail to enter left atrium and drain into right heart circulation and usually associated with ASD or PDA
Total anomalous pulmonary venous return
Required to maintain cardiac output in TAPVR
ASD or PDA to maintain right-to-left shunting
Anatomic anomaly in which tricuspid valve leaflets are displaced downward into RV, artificially “atrializing” RV
Ebstein anomaly
Most common cause of Ebstein anomaly
Lithium exposure in utero
Associated conditions with Ebstein anomaly
Tricuspid regurgitation and HF
Set of conditions that present as acyanotic early on with cyanosis occurring years later
Left-to-right shunts
Types of left-to-right shunts
VSD > ASD > PDA