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Pediatric Board Review Congenital Heart Disease · PDF filePediatric Board Review –...
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Pediatric Board Review –
Congenital Heart Disease
Steven H. Todman, M.D. Pediatric Cardiologist Louisiana State University
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Our Mission
• To discuss various types of congenital heart disease that are commonly tested on the Pediatric board exam.
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The Presentation of Congenital Heart
Disease is Age Dependent • Important time periods
▫ Neonatal period: Birth to 1 month
▫ Infancy: 2 months to one year
▫ Children and adolescent
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Transitional Circulation
• In the first week of life, the PFO and PDA closes.
• Subsequently, pulmonary vascular resistance drops to normal levels by 2 months.
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Cyanosis
• Hyperoxia test is the gold standard to evaluate cyanosis.
▫ Obtain ABG to measure PO2
▫ Place in 100% oxygen for >10 minutes
▫ Measure the PO2
If PO2 <50 or unchanged, cardiac etiology is likely
If PO2 is 50-150, equivocal for cardiac or pulmonary etiology
PO2>150, cardiac etiology is unlikely.
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Neonatal Cardiogenic Shock
• Decrease in systemic blood flow with PDA closure.
• Symptoms
▫ Poor feeding
▫ Lethargy or irritability
▫ Oliguria
▫ Cool extremities
▫ Poor perfusion and peripheral pulses (x4)
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Pulmonary Stenosis
• Pathology: ▫ Pulmonary stenosis may
be valvular, subvalvular, or supravalvular.
• Clinical Manifestations: ▫ Mild-moderate:
asymptomatic ▫ Murmur: systolic
ejection murmur at ULSB, radiates to back. +/- click, +/- thrill
▫ ECG is normal ▫ CXR is normal
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Pulmonary Stenosis
• Clinical Manifestations: ▫ Severe/ductal
dependent: Cyanosis
▫ Moderate to severe: ECG demonstrates
RAD and RVH CXR is normal, or
can show diminished vascular markings.
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Pulmonary Stenosis
• Treatment:
▫ Mild-moderate:
Observation
▫ Severe
Balloon valvuloplasty
▫ Ductal dependent
Prostaglandins
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Pulmonary Stenosis
• Natural History
▫ Mild pulmonary stenosis
Non-progressive
▫ Moderate to severe pulmonary stenosis
Progressive
• Associations:
▫ Noonan’s syndrome
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Aortic Stenosis
• Pathology: ▫ May be valvar,
subvalvar, or supravalvar
• Clinical Manifestations ▫ Murmur: Systolic
murmur at URSB, or ULSB with radiation to the neck. +/- click +/- thrill
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Aortic Stenosis
• Clinical Manifestations
▫ Moderate to severe aortic stenosis can be associated with chest pain, syncope, or sudden death.
▫ Neonatal presentation of severe aortic stenosis may be heart failure.
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Aortic Stenosis
• EKG:
▫ Mild: normal
▫ Moderate to severe: LVH +/- strain
• CXR:
▫ Usually normal
• Natural History:
▫ Progressive
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Aortic Stenosis
• Treatment: ▫ Mild to moderate: observation ▫ Severe – Neonatal: PGE and balloon
valvuloplasty ▫ Severe – Child/Adolescent: balloon
valvuloplasty
• Associations: ▫ Bicuspid aortic valve ▫ Coarctation of the aorta ▫ Williams’ syndrome (supravalvar AS, PS)
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Coarctation of the Aorta
• Pathology: ▫ Almost always
juxtaductal • Clinical
Manifestations: ▫ First week of life: Poor
feeding, respiratory distress, shock, acidemia, weak lower extremity pulses
▫ May have no murmur, or non-specific systolic ejection murmur.
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Coarctation of the Aorta
• Treatment:
▫ Medical – PGE1 infusion first weeks of life.
▫ Surgical – Repair (end-to-end anastomosis)
• Natural History:
▫ Re-coarctation
• Associations:
▫ Bicuspid aortic valve
▫ Turner’s syndrome
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Interrupted Aortic Arch
• Pathology: ▫ Severe form of
coarctation where a portion of the aortic arch is atretic, or absent.
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Interrupted Aortic Arch
• Pathology: ▫ Severe form of
coarctation where a portion of the aortic arch is atretic, or absent.
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Interrupted Aortic Arch
• Treatment
▫ PGE1
▫ Surgical repair
• Associations
▫ Type B interrupted aortic arch and DiGeorge syndrome
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d-Transposition of the Great Arteries
• Pathology: ▫ Parallel circulation ▫ Mixing is required
(ASD, PDA)
• Clinical Manifestations ▫ Cyanosis in a large
newborn ▫ Single S2 ▫ Usually no murmur
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d-Transposition of the Great Vessels
• EKG:
▫ Normal
• CXR:
▫ Egg on a string
• Treatment:
▫ Prostaglandins
▫ +/- Balloon atrial septostomy
▫ Surgery
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d-Transposition of the Great Arteries
• Associations:
▫ Most common cyanotic lesion to present in the newborn period
▫ Big Fat blue baby
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Clinical Case
• 6 month old male presents to your clinic for a well child checkup. Pulse oxymetry measures 88% in the right upper extremity. Pulses are equal in the upper and lower extremities, and the lungs are clear to auscultation.
• Cardiac auscultation reveals a normal S1 and S2, and a loud, harsh III/VI systolic ejection murmur at the upper left sternal border.
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Clinical Case
• Differential diagnosis?
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Vignette #3
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Vignette #3
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Clinical Case
• You leave the room to check on another patient and return to find that the patient is crying unconsolably, and is visibly cyanotic. No murmur is heard.
▫ What is going on, and what is the next step?
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Hypercyanotic “TET” Spell
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Hypercyanotic “TET” Spell
• (1) Comfort the child
• (2) Oxygen (preferably BBO2)
• (3) Knee to chest position
▫ Raises systemic vascular resistance.
• (4) Morphine sulfate SQ (0.1mg/kg)
▫ Slows respiration, and may also relax the infundibulum
• (5) Phenylephrine 2 to 5 mg/kg/min
▫ Increases SVR
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Tetralogy of Fallot
• Pathology: ▫ (1) RVOT obstruction ▫ (2) RVH ▫ (3) VSD ▫ (4) Overriding aorta
• Clinical Manifestations ▫ Degree of RVOT obstruction determines
oxygen saturation ▫ Murmur: Systolic ejection murmur at the
mid to upper left sternal border
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Tetralogy of Fallot
• EKG: ▫ RVH and RAD
• CXR: ▫ Boot shaped heart (upturned cardiac apex),
decreased lung vasculature.
• Natural History: ▫ Hypercyanotic “Tet” Spells
• Associations: ▫ Most common cyanotic lesion in general ▫ DiGeorge syndrome
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Post-op
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Bundle Branch Block
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Clinical Case
• A 10 day-old boy presents to the emergency room with increased irritability, poor feeding and ashen discoloration of the skin for the past 2-3 days. He was born full term via normal vaginal delivery with no perinatal complications.
• He was well, and asymptomatic for the first week of life. There are no known sick contacts.
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Clinical Case
• Physical Exam - child in moderate to severe respiratory distress with cyanosis and gray skin tone. Capillary refill is more than 3 seconds, with weak pulses in all extremities. Blood pressure was not obtainable. Oxygen saturation was 70% on room air. Mild hepatomegaly was noted, and the cardiac apex appears displaced to the right. Auscultation revealed a single second heart sound with no significant murmurs.
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Clinical Case
• Your assessment?
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Clinical Case
• Presentation is classic for cardiogenic shock
▫ Abnormal apical impulse
▫ Single second heart sound
▫ Significant oxygen desaturation beyond what is typically seen with sepsis should prompt investigation into cardiac etiologies.
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Diagnosis and management
• Hypoplastic left heart
• Prostaglandins
• Correction of metabolic acidosis
• Avoid excessive oxygen
• Maintain normal electroloytes
▫ Calcium
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Hypoplastic Left heart syndrome
• Pathology:
▫ Hypoplasia of LV, and atresia or critical stenosis of the aortic and/or mitral valves, and hypoplasia of the ascending aorta and aortic arch.
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Hypoplastic Left Heart
• Clinical Manifestations
▫ Cardiogenic shock
Tachycardia, dyspnea, weak peripheral pulses
Generally greyish-blue skin color with poor perfusion
▫ Murmur
May have no murmur
S2 is single
PMI may be displaced to the right
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Hypoplastic Left Heart
• EKG: ▫ RVH
• CXR: ▫ Usually normal
• Natural History: ▫ Critically ill (shock) during first week of life with
PDA closure • Treatment:
▫ Prostaglandins ▫ Surgery Norwood, Bidirectional Glenn/Hemi-fontan,
Fontan
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Tricuspid Atresia
• Pathology:
▫ Absent tricuspid valve, with hypoplastic right ventricle.
▫ ASD with right to left shunting is necessary.
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Tricuspid Atresia
• Clinical Manifestations
▫ Presentation varies, however generally presents with cyanosis
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Tricuspid Atresia
• EKG: ▫ Superior QRS axis (0 to
-90 degrees), LVH • Treatment:
▫ Prostaglandins if severe cyanosis
▫ Surgery Ultimately requires
Fontan
• Associations: ▫ Cyanosis with superior
QRS/LVH = TA
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Ebstein’s Anomaly
• Pathology:
▫ Apical displacement of the tricuspid valve, so that a portion of the RV is incorporated into the RA (atrialized).
▫ A PFO/ASD is present in all patients.
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Ebstein’s Anomaly
• Clinical Manifestations
▫ Cyanosis often present in the first few days of life.
▫ Murmur
Triple or quadruple rhythm with widely split S2, and S3 and S4.
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Ebstein’s Anomaly
• EKG: ▫ RBBB, RAE, WPW
pattern, first degree heart block
• CXR: ▫ Wall to wall heart
• Treatment: ▫ Eventually requires
surgery
• Associations: ▫ WPW
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Truncus Arteriosus
• Pathology:
▫ A single arterial trunk with a truncal valve exits the heart and gives rise to the pulmonary, systemic, and coronary circulations.
▫ A large VSD is present below the truncal valve.
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Truncus Arteriosus
• Clinical Manifestations
▫ Cyanosis can be seen after birth.
▫ CHF develops weeks after birth after PVR decreases.
▫ Bounding peripheral pulses
• Murmur Single S2
May have an early diastolic murmur from truncal valve insufficiency
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Truncus Arteriosus
• EKG:
▫ Biventricular hypertrophy
• CXR:
▫ Cardiomegaly, with increased vascularity
• Treatment:
▫ Surgery
• Associations:
▫ DiGeorge syndrome
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Total Anomalous Pulmonary Venous
Return (TAPVR) • Pathology
(Supracardiac):
▫ Most common type
Common pulmonary venous sinus drains into the right SVC through the left vertical vein and the left innominate vein.
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Total Anomalous Pulmonary Venous
Return (TAPVR) • Clinical Manifestations (unobstructed
pulmonary veins)
▫ Mild cyanosis from birth, CHF, and growth restriction.
• Murmur Widely split S2, and 2-3/6 systolic ejection
murmur at ULSB
Mid-diastolic rumble at LLSB (secondary to flow through the tricuspid valve)
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Total Anomalous Pulmonary Venous
Return (TAPVR) • EKG:
▫ rSR’ pattern in V1
• CXR: ▫ Cardiomegaly, with
increased vascularity. ▫ Snowman sign
generally after 4 months.
• Treatment: ▫ Surgery
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Total Anomalous Pulmonary Venous
Return (TAPVR) • Clinical Manifestations (obstructed
pulmonary veins) ▫ Marked cyanosis and respiratory distress in
the neonatal period with FTT
• Murmur May be absent, or faint systolic ejection
murmur at the ULSB
• CXR ▫ Lung fields show pulmonary edema (may be
confused with pneumonia or hyaline membrane disease)
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Left to Right Shunt Lesions
• ASD
• VSD
• PDA
• Endocardial Cushion Defect (AV canal)
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Atrial Septal Defect
• Pathology:
▫ Most common
Secundum
▫ Sinus venosus defects are associated with PAPVR.
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Atrial Septal Defect
• Clinical Manifestations
▫ Pediatric patients are typically asymptomatic
Generally, no CHF
▫ Murmur
Widely split and fixed S2 and a systolic ejection murmur at the ULSB
Mid-diastolic rumble from relative tricuspid stenosis at the LLSB
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Atrial Septal Defect
• EKG:
▫ rSR’ pattern in V1
• CXR:
▫ Cardiomegaly with right heart enlargement
▫ Prominent pulmonary artery and increased lung markings
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Atrial Septal Defect
• Natural History:
▫ Small defects tend to close spontaneously prior to 4 years of life.
▫ Larger defects rarely close spontaneously
• Treatment:
▫ Interventional closure in cath lab ~4 years of age
▫ Surgical closure if not amenable to device closure
• Association:
▫ Holt-Oram
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Ventricular Septal Defect
• Pathology (small):
▫ Holosystolic murmur at the
LLSB
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Ventricular Septal Defect
• Clinical Manifestations (small VSD)
▫ Pediatric patients are typically asymptomatic with normal growth and development
• EKG:
▫ normal
• CXR:
▫ normal
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Ventricular Septal Defect
• Pathology (moderate to large VSD):
▫ Murmur
Holosystolic murmur at LLSB
+/- Apical diastolic murmur
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Ventricular Septal Defect
• Clinical Manifestations (moderate to large VSD) ▫ Poor weight gain, decreased exercise
tolerance, frequent lower respiratory infections, and CHF
• EKG: ▫ LVH, or biventricular hypertrophy
• CXR: ▫ Cardiomegaly with increased pulmonary
vascularity
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Ventricular Septal Defect
• Treatment
▫ Anticongestive medications
Dieuretics first line
▫ Surgical repair 4-6 months of age.
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Patent Ductus Arterisus
• Pathology (small):
▫ Continuous murmur at the LUSB.
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Patent Ductus Arteriousus
• Clinical Manifestations (small PDA)
▫ Pediatric patients are typically asymptomatic with normal growth and development
• EKG:
▫ normal
• CXR:
▫ normal
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Patent Ductus Arteriosus
• Pathology (moderate to large PDA):
▫ Murmur
Continous murmur at LUSB
Bounding peripheral pulses with wide pulse pressure
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Patent Ductus Arteriosus
• Clinical Manifestations (moderate to large PDA) ▫ Poor weight gain, decreased exercise
tolerance, frequent lower respiratory infections, and CHF
• EKG: ▫ LVH, or biventricular hypertrophy
• CXR: ▫ Cardiomegaly with increased pulmonary
vascularity
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Patent Ductus Arteriosus
• Treatment
▫ Indomethacin if in the immediate newborn period, particularly with pre-term infants
▫ Device closure in the cardiac catheterization laboratory
▫ Surgical ligation
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Endocardial Cushion Defect
• Pathology: Complete AV canal most common form
▫ Ostium Primum ASD, VSD in the inlet ventricular septum, and cleft mitral valve
▫ Results in interatrial and interventricular shunts, and AV valve regurgitation
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Endocardial Cushion Defect
• Clinical Manifestations
▫ Patients typically have signs of CHF.
▫ Murmur
Systolic ejection murmur at upper left sternal border (relative pulmonary stenosis)
Apical holosystolic murmur (mitral regurgitation)
May also have a gallop rhythm and hepatomegaly if CHF is present.
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Endocardial Cushion Defect
• EKG:
▫ Superior QRS axis
▫ First degree heart block
▫ RVH
• CXR:
▫ Cardiomegaly with increased lung markings
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Endocardial Cushion Defect
• Natural History: ▫ Heart failure 1 to 2 months after birth. ▫ Recurrent lower respiratory infections are
common.
• Treatment: ▫ Anticongestive medications – Lasix ▫ Surgical repair at approximately 4 months of
age.
• Association: ▫ Down Syndrome
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