Background
Epidemiology
- Affects around 1/250 UK babies. The vast majority survive until adulthood, and 10% are not even diagnosed until then.
- Many conditions have a variable presentation, with some apparent at birth or early infancy (poor feeding, lethargy, SOB, heart failure) and others only becoming symptomatic (if at all) later in life.
- This page describes the commoner conditions, including the three commonest: VSD, ASD, and bicuspid aortic valve.
Structures affected
- Valves: bicuspid aortic valve, aortic stenosis, pulmonary stenosis, tricuspid atresia.
- Septa: atrial or ventricular.
- Vessels: coarctation of the aorta, transposition of the great arteries, patent ductus arteriosus, persistent truncus arteriosus.
- Ventricles: hypoplastic left heart.
Atrial septal defect (ASD)
Pathophysiology
- Ostium secundum ('second hole') defects high in septum are the commonest clinically-significant ASD. Usually first present in adulthood, though more significant defects can be detected as early as in utero.
- Ostium primum defects present in childhood and are at the level of the mitral/tricuspid valve (the 'endocardial cushion'), where atrial and ventricular septa meet; hence they are classed as an 'AV septal defect'.
- PFO is technically a defect of the atrial septum, though is usually considered separately from other ASDs.
- ASD initially causes left→right shunt due to higher pressure in left. As left ventricle compliance decreases with age (possibly exacerbated by HTN), shunt is exacerbated → ever greater volume overload of right heart → pulmonary HTN → RVH → overpowers left pressure leading to Eisenmenger's phenomenon i.e. reversal of shunt (now right→left) and hence cyanosis. Occurs in 10% if untreated.
Signs and symptoms
- Respiratory: SOB, cyanosis, haemoptysis.
- Chest pain
- On auscultation: ejection systolic murmur in pulmonary area, split S1, wide fixed split S2.
- Pulmonary HTN, which may lead to pulmonary or tricuspid regurgitation.
- ↑JVP
- AF
Investigations
- Echo is diagnostic.
- ECG: right axis deviation, RBBB.
- CXR: cardiomegaly from right atrial and ventricular enlargement, prominent pulmonary artery.
- Cardiac catheterization if pulmonary HTN suspected.
Management
Ventricular septal defect (VSD)
Pathophysiology
- Standalone or part of conditions such as Fallot's tetralogy or trisomies 13, 18, and 21.
- Can also be acquired post-MI (ventricular septal rupture).
- Causes left to right shunt → blood recycles through pulmonary circulation back to left heart → left overload and LVH → pulmonary HTN.
- Small defects are asymptomatic and can close spontaneously, while moderate and large defects may present very early and require treatment.
Signs and symptoms
- Harsh pansystolic murmur at left sternal edge, even with small defects.
- Features of CHF: ↑HR, SOB, hepatomegaly.
- Systolic thrill.
- Parasternal heave.
Investigations
- Echo is diagnostic.
- ECG: LVH signs if moderate, possibly RVH too if large defect.
- CXR: cardiomegaly, large pulmonary arteries if large defect.
Management
- Initially medical as many close spontaneously. Diuretics for HF and ACEi to reduce afterload.
- Surgical closure if unsuccessful or symptoms/complications.
Complications
- Aortic regurgitation.
- Infective endocarditis.
- Eisenmenger's (shunt reversal and cyanosis).
Bicuspid aortic valve
- Commonest congenital heart disease presenting in adults, male:female 2:1.
- Usually undetected at birth and remains asymptomatic (and undetected) in 70%.
- Can cause atrial stenosis or regurgitation.
Coarctation of the aorta
Pathophysiology
- Narrowing of descending thoracic aorta, usually distal to origin of left subclavian artery, leading to LV pressure overload, CHF, HTN, and hypoperfusion of lower body.
- Can be an isolated defect, or accompanied by bicuspid aortic valve, VSD, or Turner's syndrome.
Signs and symptoms
- ↑BP.
- Radio-femoral delay and/or weak femoral pulse.
- Systolic murmur in left infraclavicular area and below left scapula.
Investigations
- ECG: may show LVH or RVH.
- CXR: CHF, rib notching.
- Echo is usually diagnostic. Should include high parasternal or suprasternal view to visualise the narrowing.
- CT or MRI angiogram, especially if echo unclear.
Management
- Indications: CHF or severe HTN.
- Open angioplasty or balloon angioplasty with stenting.
Complications
Patent ductus arteriosus (PDA)
Pathophysiology
- Persistence of fetal connection between pulmonary artery and aorta.
- Moderate and large PDA can lead to symptomatic left to right shunt.
- Increased risk in premature or low birth weight babies.
Signs and symptoms
- Continuous machine murmur, which may be worse with smaller hole due to more turbulent flow. Sometimes just systolic, especially early in life.
- Left subclavicular systolic thrill.
- Displaced, heaving apex.
- Collapsing pulse and wide pulse pressure
Investigations
- Echo is diagnostic.
- CXR: large pulmonary arteries and large left heart.
Management
- Preterm: treat if symptomatic, IV NSAIDs (1st line) or surgical ligation (2nd line).
- Term: wait until large/old enough for endovascular closure if asymptomatic (i.e. no heart failure), otherwise digoxin plus furosemide (1st line) or surgical ligation (2nd line) if symptomatic.
Complications
- CHF
- Eisenmenger's syndrome.
Patent foramen ovale (PFO)
- Persistence of the foramen ovale – the opening between both atria – beyond 1 yr.
- Prevalence is 1/5, but is usually asymptomatic and does not lead to shunt like other ASDs.
- In adulthood it increases the risk of stroke and migraine.
Fallot's tetralogy
Pathophysiology
- Commonest cyanotic congenital heart disease. Cyanosis due to ↓blood flow to lungs and right→left shunt.
- Symptoms present at birth or develop <1 yr.
- Can be part of DiGeorge syndrome.
Components, ROVeR:
- Right ventricular outflow tract obstruction (RVOT): pulmonary stenosis at valve or just below.
- Overriding aorta: sits above VSD and connects to both ventricles.
- VSD
- RVH
Signs and symptoms
- Poor growth.
- SOB including acute hypoxic episodes (agitated, restless, cyanosis).
- Cyanosis and clubbing.
- Ejection systolic murmur.
- Toddlers may squat to increase peripheral resistance and hence reduce right→left shunt.
DDx: Cyanotic congenital heart defects
- Transposition of the great vessels.
- Tricuspid atresia.
- Total anomalous pulmonary venous return.
- Persistent truncus arteriosus.
- Hypoplastic left heart.
- Eisenmenger's syndrome.
Investigations
- Echo is diagnostic.
- ECG: right axis deviation and RVH, RBBB (especially after surgery).
- CXR: normal or boot-shaped heart.
Management
- Surgery usually performed by 1 yr (earlier if severe), and aims to close the VSD and relieves the RVOT.
- Until then, medical therapy if symptomatic: O2, morphine, β-blockers, and prostaglandins to keep ductus open.
Baby check at birth and 6 weeks Check notes and get equipment ready: Measuring tape. Ophthalmoscope Sats probe. In notes, look at full details of pregnancy and birth, including Apgar scores at 1 and 5 minutes. Observation: Colour: pink/red, pale, jaundiced. Any rash? Erythema toxicum is a self-limiting rash of red papules and vesicles, surrounded by red blotches which sometimes give a halo appearance. Usually occurs between 2 days and 2 weeks. Behaviour and mood. Movements. Face: dysmorphism? Head: Feel fontanelle (bulging? sunken?) and sutures. Note that posterior fontanelle closes at 1-2 months, and anterior at 7-19 months. Measure circumference at widest point; take the highest of 3 measurements. Looking for hydrocephalus and microcephaly. Eyes: check red reflex with ophthalmoscope. Feel inside top of mouth with little finger for cleft palate. Also gives you the sucking reflex. Inspect ears to see if they are low-set (below eye level), have any tags or lumps, and check behind the
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