Congenital Heart Disease, Cardiomyopathies, and Pericardial Disease — Essential Review

Congenital Heart Diseases: Key Points

  • Classification
    • Cyanotic vs acyanotic
    • Major cyanotic example: Tetralogy of Fallot (TOF)
  • Common acyanotic defects
    • ASD (atrial septal defect), VSD (ventricular septal defect)
    • PDA (patent ductus arteriosus)
    • Coarctation of the aorta
  • Murmur patterns (from transcript)
    • Atrial and ventricular septal defects: typically a systolic murmur
    • Coarctation: systolic murmur
  • Fetal circulation and postnatal changes
    • Opening between pulmonary artery and aorta is the ductus arteriosus; it should close after birth
    • “Patent” means open
  • Key anatomy terms (from transcript)
    • PDA: opening between the pulmonary artery and the aorta
    • Foramen ovale vs ASD: the foramen ovale is a very small opening in fetal life; ASD is a true defect (hole) in the atrial septum
  • Transposition of the great vessels (TGA)
    • Concept: great vessels are switched (left-right reversal)
    • The idea discussed: abnormal flow leads to right ventricle hypertrophy as it pumps to the systemic circuit
  • TOF sequence cue from transcript
    • Pulmonic stenosis is the first abnormality mentioned; TOF presents with cyanosis (“blue spells”) especially when distressed
  • Cardiomyopathies: overview
    • Dilated cardiomyopathy (DCM)
    • Systolic dysfunction; dilated chambers; reduced ejection fraction (EF) and reduced stroke volume (SV)
    • HF with reduced EF (HFrEF)
    • Echo: dilated chambers
    • Hypertrophic cardiomyopathy (HCM)
    • Hypertrophied myocardium; diastolic dysfunction (impaired filling)
    • EF often preserved; reduced SV due to limited filling; HF with preserved EF (HFpEF) common
    • Restrictive cardiomyopathy (RCM)
    • Stiff ventricular walls; diastolic dysfunction; reduced compliance
    • EF preserved; reduced SV
  • Distinguishing EF vs SV in these disorders (concepts from discussion)
    • DCM: reduced EF and reduced SV
    • HCM: EF often preserved; SV reduced due to improper filling
    • RCM: EF preserved; SV reduced due to poor filling
  • Pericardial diseases (from transcript)
    • Pericarditis
    • Inflammation of the pericardial lining
    • Classic pain relief with sitting up/leaning forward
    • Elevated ESR (very sensitive, nonspecific marker of inflammation)
    • Pericardial effusion and tamponade
    • Fluid accumulation around the heart (pericardial effusion)
    • Cardiac tamponade: can occur with effusion; signs include pulsus paradoxus (significant drop in systolic BP with inspiration)
    • Exam cues may include hypotension, tachycardia, elevated jugular venous pressure (Beck’s triad in classic teaching; transcript notes a related triad terminology may be used in exams)
  • Quick clinical cues from the case discussion (as in transcript)
    • Pulses paradoxus signals tamponade or significant pericardial involvement
    • Elevation in ESR supports pericarditis
    • Pain relief with sitting forward is characteristic of pericarditis
  • Radiographic/imaging hints from the discussion
    • Imaging (e.g., radiographs) used to assess effusion and anatomy; interpretation involves understanding tissue density and penetration (described qualitatively in the lecture)
  • Quick recap of terminology
    • PDA=extPatentDuctusArteriosusPDA = ext{Patent Ductus Arteriosus}
    • EF=extEjectionFractionEF = ext{Ejection Fraction}, often discussed as reduced in DCM, preserved in HCM/RCM
    • SV=extStrokeVolumeSV = ext{Stroke Volume}
    • Be mindful of HF classifications: HFrEF (reduced EF) vs HFpEF (preserved EF)
  • Note (transcript nuance): some explanations in the lecture mix EF and filling, especially for HCM vs RCM; standard teaching generally holds EF preserved in HCM and RCM with reduced filling (diastolic dysfunction) but reduced SV can occur depending on loading conditions.