Paediatrics — Congenital Heart Disease and Neurodevelopment, NMC MBBS licence examination syllabus (Nepal Medical Council).
A baby who sweats and stops halfway through a feed is doing an exercise test, and failing it.
Congenital heart disease frightens students because the lesions have long names and complicated diagrams. But almost none of the examination depends on knowing the anatomy in detail. It depends on two things: sorting the lesions into groups using two questions, and recognising the child who is unwell.
This chapter covers that, and then the neurodevelopmental problems that present alongside it — because a child with a congenital cardiac lesion often has a syndrome, and a child with developmental concern often needs a heart examined.
Start from a physical principle: blood flows from high pressure to low pressure. Left-sided pressures are higher than right-sided ones, so a hole between the two sides shunts blood left to right — from the systemic circulation back into the lungs.
That gives the first group.
Acyanotic lesions (left-to-right shunt). Ventricular septal defect, atrial septal defect, patent ductus arteriosus. The blood reaching the body is fully oxygenated, so the child is not blue. The problem is too much blood going to the lungs: breathlessness, difficulty feeding, poor weight gain, and recurrent chest infections.
Cyanotic lesions (right-to-left shunt). Tetralogy of Fallot, transposition of the great arteries. Deoxygenated blood bypasses the lungs and reaches the body directly, so the child is blue. Here the lungs may receive too little blood.
This is why the two questions work. Is the child blue? separates the two families. Is pulmonary blood flow increased or reduced? predicts the symptoms — increased flow gives a breathless, poorly feeding, failing-to-thrive infant; reduced flow gives cyanosis. You can reason your way to the right group without recalling a single diagram.Murmurs are extremely common in healthy children, and most are innocent — the sound of normal flow through a normal heart in a thin chest, often louder during a fever.
The features of an innocent murmur are conventionally remembered as the S's: soft, systolic, short, at the left sternal edge, and sensitive — it changes with posture. And, most importantly, the child is otherwise entirely well.
Features that make a murmur pathological:
This is the emergency worth carrying out of this chapter.
Some lesions depend on the ductus arteriosus remaining open to maintain either systemic or pulmonary blood flow. While the duct is patent the baby appears well and passes the newborn examination. Over the first days of life the duct closes — and the baby then collapses suddenly, or becomes deeply cyanosed.
Why this matters practically: the presentation looks exactly like neonatal sepsis, which is much commoner, so the cardiac cause is easily missed. Two bedside findings help:
Developmental assessment sounds vague until you give it structure. Assess four domains separately: gross motor; fine motor and vision; speech, language and hearing; and social, emotional and behavioural.
Then ask two questions about the pattern.
Is the delay isolated or global? Delay in one domain suggests a problem specific to that system — isolated speech delay raises hearing loss, isolated motor delay raises a neuromuscular or cerebral cause. Delay across all four suggests a broader problem.
What is the direction of travel? This matters more than any single milestone. A child progressing slowly along the normal sequence is a different clinical problem from a child who has stopped progressing, and both differ entirely from a child who is losing skills already acquired.
Two practical points before referring anyone: check hearing and vision. Deafness presents as speech delay and as apparent inattention; poor vision presents as motor and social delay. Both are treatable, both are commonly missed, and both mimic conditions that are neither.
No milestone ages are given in this chapter, deliberately. Normal ranges are wide, sources differ, and a remembered age treated as a threshold causes two opposite errors — falsely reassuring about a child who needs assessment, and alarming the parents of a normal one. Use the chart your service actually uses, and weigh the pattern.
Cerebral palsy is a non-progressive injury to the developing brain, affecting movement and posture. The word non-progressive is the source of most confusion about it.
The lesion does not worsen. But the child grows, and a fixed injury interacting with a growing body produces a changing clinical picture: muscles that do not stretch in proportion to bones produce contractures, and hips may subluxate, and scoliosis may develop. Parents told the condition is non-progressive and then seeing their child's function decline understandably feel misled, so the explanation needs care.
That said — genuine regression, or the appearance of new neurological signs, means the diagnosis needs revisiting. A progressive neurological disorder can be mistaken for cerebral palsy early on.
One point that matters enormously to families and is often got wrong: the degree of motor impairment does not predict intelligence. A child with severe physical disability may have entirely normal cognition and be trapped behind a body that will not cooperate. Assess cognition and communication separately, and never assume from the wheelchair.Management is multidisciplinary and lifelong: nutrition and feeding safety, posture and mobility, communication, education, pain, and support for the family. The medical contribution is a part of it rather than the whole.
Down syndrome sits at the junction of the two halves of this chapter, which is why it is worth a paragraph here.
It is associated with congenital heart disease frequently enough that cardiac assessment is part of the initial workup, not something to arrange if a murmur appears — and the reason is important: a large left-to-right shunt may be silent early, and can cause irreversible pulmonary vascular damage if it is not identified in time.
It also brings developmental delay, and a range of other associations — hearing and visual problems, thyroid disease, atlantoaxial instability, and increased susceptibility to infection — which is why children with Down syndrome are followed on a structured surveillance schedule rather than only when something goes wrong.
No milestone ages, saturation thresholds or drug doses appear in this chapter — normal developmental ranges are wide and differ between sources, and the relevant drugs are specialist-initiated. Use your local charts and protocols.
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