Cardiology - Congenital Heart Disease Flashcards
Differential for Acyanotic Congenital Heart Disease
Ventricular septal defect (most common) Atrial septal defect Patent ductus arteriosus Coarctation of aorta Aortic valve stenosis
Which septal defects are most common?
Ventricular septal defect is MOST COMMON
BUT
Atrial septal defects are more commonly NEWLY diagnosed in adults
Differential of Cyanotic Congenital Heart Disease
Tetralogy of Fallot (more common than TGA BUT TGA presents earlier)
Transposition of the great arteries (TGA)
Tricuspid atresia
Pulmonary vein sTenosis
Is atrial septal defects more common in males or females?
Females
What conditions is ostium primum atrial septal defect associated with?
Downs
Cleft mitral valve
VSD
Subaortic stenosis
Downs Syndrome is associated with which atrial septal defect?
Ostium primum
Early life presentations of atrial septal defects
Early life:
- usually asymptomatic
- increased tendency to LRTIs
Late life presentations of atrial septal defects
Left to right shunting increases when HTN or CAD reduces LV compliance
Atrial arrhythmia
Pulmonary hypertension
Right heart failure
Which familial syndrome is associated with Ostium secundum atrial septal defect? Which chromosome is involved?
Familial ostium secundum
Autosomal dominant linked to Ch5
Atrial Septal Defect - auscultation findings
Split S1 with loud T1
Widely split FIXED S2
Systolic:
- midsystolic pulmonary outflow murmur
Diastolic:
- mid diastolic rumble at 4th ICS LSB (due to increased flow across tricuspid)
ECG findings in Ostium Secundum Atrial Septal Defect
R axis deviation
ECG findings in Ostium Primum Atrial Septal Defect
L axis deviation
When to close an Atrial Septal Defect?
- Symptoms
- Haemodynamically significant shunt (RV enlargement and Qp:Qs ratio >1.5 (pulm:systemic blood flow)
- Arrythmias (BEST predictor of preclosure is AGE)
- Paradoxical embolisaiton
- Platypnoea/Orthopnoea Syndrome = dyspnoea and hypoxia on upright due to increased R to L shunting when upright
When NOT to close an Atrial Septal Defect?
- Irreversible pulm arterial hypertension (ie Eisenmenger physiology)
BECAUSE: if it is closed with severe pulmonary hypertension there is possibility for haemodyanmic collapse AND can convert to primary pulmonary hypertension which has a worse prognosis
How do Ventricular Septal Defects present?
Murmur: loud holosystolic at LLSB
Heart failure with dilated LV
Endocarditis
Cyanosis if pulmonary hypertension
Complications of Ventricular Septal Defects?
1) Ao regurgitation (due to poorly supported RCA cusp)
2) Infective endocarditis
3) Eisenmengers
4) Right heart failure
5) Pulmonary hypertension
When to close a Ventricular Septal Defect?
- Haemodynamically significant shunt with:
1) symptoms
2) LV enlargement
3) Qp:Qs >2 - Pulmonary hypertension with net L to R shunt
- Other: infective endocarditis / aortic regurg / RVOTO
What conditions predispose to a Patent Ductus Arteriosus?
- maternal rubella
- neonatal prematurity
What is differential cyanosis?
Cyanosis + clubbing of toes
- when severe pulmonary vascular disease results in reversal of flow through the ductus (–> unoxygenated blood shunted to descending aorta)
(ie: patent ductus arteriosus)
Clinical features of patent ductus arteriosus
- Continuous murmur beneath left clavicle
- -> assoc with thrill
- -> machine quality
- wide pulse pressure with ‘bounding’ pulses
- usually develop EISENMENGER’S
Complications of Patent Ductus Arteriosus
- Heart failure
- Infective endocarditis (10% lifetime risk)
- Severe pulmonary vascular obstruction can cause aneurysmal dilatation, calcification and rupture of ductus
When to close a Patent Ductus Arteriosus
- left chamber enlargement
- pulmonary hypertension with L to R shunt
- previous IE
- audible murmur
* DO NOT CLOSE if EISENMENGER or if ASYMPTOMATIC+INAUDIBLE*