PE22.1 | Acyanotic Heart Disease — Summary & Reflection

KEY TAKEAWAYS

Acyanotic congenital heart disease encompasses two fundamental haemodynamic categories: (1) Left-to-right shunt lesions (VSD, ASD, PDA) — causing pulmonary overcirculation, volume overload of the left heart, failure to thrive, recurrent chest infections, and cardiac failure in infancy; and (2) Obstructive lesions (PS, AS, Coarctation of the Aorta) — causing pressure overload of the relevant ventricle without an initial shunt, typically presenting with murmur and exertional symptoms. VSD is the most common CHD; PDA's continuous machinery murmur is pathognomonic; ASD's wide fixed S2 splitting is the hallmark; CoA's femoral-radial delay and rib notching are classic examination findings. The Qp:Qs ratio (via Fick/Doppler) quantifies shunt haemodynamics — >2:1 is clinically significant. The most critical complication of untreated L→R shunts is Eisenmenger syndrome: progressive pulmonary arterial hypertension leading to shunt reversal, cyanosis, and inoperability. Differential cyanosis (lower limbs cyanosed, upper limbs pink) is pathognomonic of reversed PDA. Investigation uses ECG (chamber hypertrophy patterns), CXR (cardiomegaly, pulmonary plethora, rib notching, figure-3 sign), and echocardiography (anatomy + Doppler haemodynamics). Medical management uses weight-based anti-failure drugs (furosemide 1–2 mg/kg, captopril 0.1–0.3 mg/kg, digoxin 10 mcg/kg/day) and high-calorie feeds; PDA in premature neonates is closed pharmacologically (indomethacin 0.1–0.2 mg/kg or ibuprofen 10 mg/kg). Definitive treatment is timely device or surgical closure; Eisenmenger syndrome (PVR index >8–10 Wood units/m²) is inoperable and managed with pulmonary vasodilators.

REFLECT

Reflect on the case that opened this module — the 4-month-old girl with failure to thrive, pansystolic murmur, and congestive cardiac failure. You now understand that her large VSD has been driving a left-to-right shunt since birth, flooding her pulmonary circulation, imposing volume overload on her left heart, and causing the very symptoms that brought her to clinic. But imagine this same child is not diagnosed until age 12. What would she look like? What single radiological or echocardiographic finding would tell you she has crossed the point of no return into Eisenmenger syndrome? Kolb's reflective cycle asks: what happened, why did it happen, what does it mean for future practice, and what would you do differently? Apply that cycle to this case: what in the NMC competency PE22.1 — 'describe the haemodynamic changes, clinical presentation, complications and management of Acyanotic Heart Diseases' — anchors the moral and clinical urgency of early diagnosis?