Congenital Heart Disease in Children - Acyantoic , Cyanotic, obstructive Defects| Pediatrics| ASD,VSD,TOF
👶 Pediatric Nursing – NORCET 2025
Congenital
Heart Disease
Complete Pediatric Nursing notes on Congenital Heart Disease covering Acyanotic defects (VSD, ASD, PDA, AVSD), Cyanotic defects (TOF, TGA, Tricuspid Atresia, TAPVC, Truncus), and Obstructive defects (PS, AS, CoA, HLHS) — with mnemonics, nursing care and MCQs for NORCET, AIIMS & State Nursing Exams.
🔵 Acyanotic Defects
🔴 Cyanotic Defects
🟢 Obstructive Defects
🧠 Mnemonics
❓ 15 MCQs
ACYANOTIC DEFECTS
L → R Shunt (No cyanosis)
CYANOTIC DEFECTS
R → L Shunt (Cyanosis present)
OBSTRUCTIVE DEFECTS
Outflow obstruction
💡 Overview of Congenital Heart Disease (CHD)
Congenital Heart Disease (CHD) refers to structural abnormalities of the heart or great vessels present at birth. It is the most common congenital anomaly in newborns, occurring in approximately 8–10 per 1000 live births. CHD accounts for nearly 30% of all congenital anomalies.
Incidence
8–10/1000
Live births
Most Common CHD Overall
VSD
25–30% of all CHD
Most Common Acyanotic
VSD
Ventricular Septal Defect
Most Common Cyanotic
TOF
Tetralogy of Fallot
Associated Syndrome
Down Syndrome
Most common genetic link
🧠
Mnemonic – Classification of CHD
Acyan = Acyanotic → Left-to-Right shunt → Pulmonary overcirculation (NO cyanosis initially)
Cyan = Cyanotic → Right-to-Left shunt → Systemic desaturation (cyanosis PRESENT)
Obs = Obstructive → No shunt → Obstruction to outflow
👉 Key rule: L→R shunt = Acyanotic (blood goes to lungs = pulmonary HTN risk) | R→L shunt = Cyanotic (deoxygenated blood enters systemic = cyanosis)
| Feature | Acyanotic (L→R) | Cyanotic (R→L) | Obstructive |
|---|---|---|---|
| Shunt Direction | Left → Right | Right → Left | No shunt |
| Cyanosis | Absent initially | Present from birth / early | Absent (unless severe) |
| Pulmonary Blood Flow | ↑ Increased | ↓ Decreased (most) | Normal or ↓ |
| Saturation | Normal systemic SpO₂ | Low SpO₂ (<95%) | Normal or borderline |
| Examples | VSD, ASD, PDA, AVSD | TOF, TGA, Tricuspid Atresia | PS, AS, CoA, HLHS |
| Risk if untreated | Pulmonary hypertension → Eisenmenger's | Severe hypoxia, death | Heart failure, sudden death |
⚠️
Eisenmenger Syndrome: In long-standing L→R shunt (acyanotic), pulmonary hypertension develops → pulmonary vascular resistance exceeds systemic resistance → shunt REVERSES to R→L → cyanosis now appears (acyanotic becomes cyanotic). Irreversible — no surgery possible at this stage!
⚠️ Causes & Risk Factors of CHD
| Category | Cause / Risk Factor | Associated CHD |
|---|---|---|
| Chromosomal | Down Syndrome (Trisomy 21) | ASD, VSD, AVSD (40–50% of Down's have CHD) |
| Chromosomal | Turner Syndrome (45,XO) | Coarctation of Aorta (CoA), Bicuspid aortic valve |
| Chromosomal | DiGeorge Syndrome (22q11 deletion) | TOF, Truncus Arteriosus, Interrupted aortic arch |
| Chromosomal | Marfan Syndrome | Aortic root dilation, Mitral valve prolapse |
| Maternal Infections | Rubella in 1st trimester (TORCH) | PDA, PS, peripheral pulmonic stenosis |
| Maternal Drugs | Lithium | Ebstein anomaly (tricuspid valve) |
| Maternal Drugs | Phenytoin, Warfarin, Alcohol, Thalidomide | Various CHDs |
| Maternal Disease | Diabetes mellitus (pre-gestational) | TGA, VSD, Cardiomegaly |
| Maternal Disease | SLE, Lupus antibodies | Congenital heart block |
| Prematurity | Premature birth | PDA (most common in premature infants) |
| Genetic/Familial | Family history of CHD | Risk 2–4× higher |
🧠
Mnemonic – Syndrome–CHD Associations
Down = AVSD / VSD / ASD
Turner = Coarctation of Aorta
DiGeorge = TOF / Truncus
Marfan = Aortic root
Rubella = PDA / PS
Lithium = Ebstein anomaly
👉 "Down Turner DiGeorge Marfan Rubella Lithium" — covers all major syndrome–CHD associations!
In acyanotic defects, a structural opening allows oxygenated blood (left side) to shunt to the right side → enters pulmonary circulation again → pulmonary overcirculation → increased work on the heart → heart failure and pulmonary hypertension if untreated. Cyanosis is NOT present initially because systemic circulation still receives oxygenated blood.
🧠
Mnemonic – Acyanotic Defects: "4 AVDs"
VSD – Ventricular Septal Defect (MOST COMMON)
ASD – Atrial Septal Defect
PDA – Patent Ductus Arteriosus
AVSD – Atrioventricular Septal Defect
👉 All acyanotic defects have L→R shunt → ↑ pulmonary blood flow. The lung is "flooded" with blood, not the body.
VSD – Ventricular Septal Defect
Most Common CHD Overall| Defect | Opening in interventricular septum (wall between left & right ventricles) |
| Shunt | L→R (oxygenated LV blood → RV → pulmonary artery) |
| Murmur | Harsh pansystolic (holosystolic) murmur at left lower sternal border (LLSB) |
| Symptoms | Heart failure, FTT, recurrent LRTI, tachypnoea, sweating with feeds |
| Special sign | Thrill palpable at LLSB in large VSDs |
| X-ray | Cardiomegaly + pulmonary plethora (increased vascular markings) |
| Small VSD | May close spontaneously by age 2–4 years (esp. muscular type) |
| Treatment | Small: observe. Large: surgical patch repair or catheter-based device closure |
💙 Maladie de Roger = small restrictive VSD with loud murmur but no symptoms. Down Syndrome → most common associated CHD is AVSD/VSD.
ASD – Atrial Septal Defect
Opening between atria| Defect | Opening in interatrial septum between left and right atria |
| Most Common Type | Ostium Secundum (70%) — in fossa ovalis region |
| Other Types | Ostium Primum (Down Syndrome), Sinus Venosus |
| Shunt | L→R (LA blood → RA → RV → pulmonary artery) |
| Murmur | Ejection systolic murmur at pulmonary area (2nd left ICS) + FIXED SPLIT S2 (pathognomonic) |
| Symptoms | Often asymptomatic in childhood; exercise intolerance, recurrent RTIs |
| ECG | Right axis deviation, RBBB (right bundle branch block) — rSR' pattern in V1 |
| Treatment | Device closure (Amplatzer device) or surgical repair; Secundum type — best for device closure |
💙 FIXED SPLIT S2 is the HALLMARK of ASD — this is the most asked clinical sign! Normally S2 splits on inspiration only; in ASD it is always split (fixed) because RV volume is always higher.
PDA – Patent Ductus Arteriosus
Ductus fails to close| Defect | Failure of ductus arteriosus (fetal blood vessel connecting aorta to pulmonary artery) to close after birth |
| Ductus normally closes | Functionally within 24–48 hrs; anatomically by 2–3 weeks |
| Shunt | L→R (Aorta → Pulmonary Artery — because aortic pressure is higher) |
| Murmur | Continuous "machinery murmur" (Gibson murmur) — heard throughout systole AND diastole at left 2nd ICS |
| Pulse | Bounding (water-hammer) pulse — wide pulse pressure |
| Premature infants | Most common cardiac defect in premature neonates; PGE₂ keeps ductus open |
| Medical closure | Indomethacin or Ibuprofen (NSAID — inhibit prostaglandins) → promotes ductal closure |
| Surgical/Cath | Ligation or device coil occlusion |
💙 Machinery murmur = PDA signature. Indomethacin = drug to CLOSE PDA. PGE₁ (Prostaglandin E₁) = drug to KEEP ductus OPEN (needed in duct-dependent cyanotic CHDs like TGA).
AVSD – Atrioventricular Septal Defect
Endocardial Cushion Defect| Defect | Combined ASD (ostium primum) + VSD + abnormal AV valves (common AV valve) |
| Types | Partial (primum ASD + cleft mitral valve); Complete (ASD + VSD + common AV valve) |
| Association | Down Syndrome (40–50% of Down's with CHD have AVSD) |
| Shunt | Complex L→R shunt at atrial + ventricular level |
| Symptoms | Severe CHF in infancy, failure to thrive, recurrent respiratory infections |
| ECG | Left axis deviation (superior axis) — characteristic of AVSD |
| Treatment | Complete surgical repair by 3–6 months (before irreversible pulmonary HTN) |
💙 Left Axis Deviation on ECG in a child with Down Syndrome = AVSD until proven otherwise. This is a very high-yield clinical clue for exams!
💚
Acyanotic Defect Signs of Heart Failure in Infants: Tachypnoea (RR>60), Tachycardia (HR>160), Sweating during feeds (effort equivalent), Poor weight gain (FTT), Hepatomegaly, Feeding difficulty, Recurrent lower respiratory tract infections (LRTIs). Sweating during feeds is the INFANT equivalent of dyspnoea on exertion!
In cyanotic defects, deoxygenated blood from the right side shunts directly to the left side and enters the systemic circulation without passing through the lungs for oxygenation → SpO₂ drops → visible cyanosis. Most cyanotic lesions present in the first few days to weeks of life.
🧠
Mnemonic – Cyanotic Defects: "5 T's + 1 P"
Tetralogy of Fallot (Most Common)
Transposition of Great Arteries (TGA)
Tricuspid Atresia
Total Anomalous Pulmonary Venous Connection (TAPVC)
Truncus Arteriosus
Pulmonary Atresia
👉 "5 T's + Pulmonary Atresia" = ALL cyanotic CHDs! TOF is most common; TGA is the most common NEONATAL cardiac emergency.
⭐ Tetralogy of Fallot (TOF) – Most Common Cyanotic CHD
🚨
MOST HIGH-YIELD in NORCET! TOF is the most common cyanotic CHD (65–70% of cyanotic CHDs). Know ALL 4 components, the "Tet spell," squatting posture, and treatment. These are asked in nearly every nursing exam.
1
Pulmonary Stenosis
Obstruction to RV outflow (infundibular or valvular). Most important component — determines degree of cyanosis
2
VSD (Large)
Large ventricular septal defect allowing R→L shunting when RV pressure exceeds LV pressure
3
Overriding Aorta
Aorta "straddles" the VSD — sits over both ventricles, receiving blood from both sides
4
Right Ventricular Hypertrophy
RVH develops due to increased resistance from pulmonary stenosis — compensatory mechanism
🧠
Mnemonic – 4 Components of TOF: "PROVE"
Pulmonary Stenosis (MOST IMPORTANT)
Right Ventricular Hypertrophy
Overriding Aorta
VSD (large)
Every Tet spell = Hypercyanotic episode
Alternative: "PROV" → PS + RVH + Overriding Aorta + VSD
| Feature | Description |
|---|---|
| Cyanosis | Present — worsens with activity/crying. Peripheral cyanosis → central cyanosis over time |
| Boot-shaped heart (X-ray) | Coeur en sabot — upturned apex (RVH) + concave pulmonary bay = CLASSIC radiological sign of TOF |
| Murmur | Ejection systolic murmur at left upper sternal border (pulmonary stenosis murmur). Large VSD murmur may be heard too |
| Clubbing | Finger and toe clubbing — develops after 6 months due to chronic hypoxia |
| Polycythaemia | Compensatory ↑ RBCs due to chronic hypoxia → hyperviscosity → risk of CVA in young children |
| ECG | Right axis deviation + RVH pattern (R waves in V1) |
| Squatting posture | Children instinctively squat after exertion — increases systemic vascular resistance → reduces R→L shunt → relieves cyanosis |
| Tet spell (Hypercyanotic attack) | Sudden severe cyanosis episode — EMERGENCY. Triggered by crying, feeding, defecation, fever |
🚨
Tet Spell Management – MUST KNOW! Position: Knee-chest (squatting) position → increases SVR → ↓ R→L shunt. Give O₂. IV Morphine (reduces hyperpnoea). IV Propranolol (reduces infundibular spasm). IV Phenylephrine (vasopressor — raises SVR). IV fluids. Correct acidosis with sodium bicarbonate. Never allow the child to cry continuously!
TGA – Transposition of Great Arteries
Most common NEONATAL cardiac emergency| Defect | Aorta arises from RV; Pulmonary Artery arises from LV — circuits run in PARALLEL not in series |
| Result | Systemic circulation = deoxygenated loop; Pulmonary circulation = oxygenated loop. They never mix without a shunt |
| Presentation | Cyanosis from BIRTH — severe. "Blue baby" on day 1 |
| Association | Maternal diabetes (most common maternal risk factor) |
| Immediate Rx | Prostaglandin E₁ (PGE₁) infusion to keep PDA open → allows mixing |
| Balloon Septostomy | Rashkind procedure — creates/enlarges ASD to allow blood mixing (palliative) |
| Definitive Surgery | Arterial Switch Operation (Jatene procedure) — within first 2 weeks of life |
| ECG | Right axis deviation; RVH |
🔴 "Egg on a string" X-ray appearance — narrow superior mediastinum (great arteries run parallel). PGE₁ = lifesaving immediate treatment. Arterial Switch = curative surgery.
Tricuspid Atresia
Absent tricuspid valve| Defect | Complete absence/atresia of tricuspid valve → no direct communication between RA and RV |
| Survival depends on | ASD + VSD or PDA for blood mixing and to maintain pulmonary blood flow |
| Shunt | Blood flows: RA → LA (via ASD) → LV → splits to body + lungs (via VSD/PDA) |
| Cyanosis | Severe from birth |
| ECG | LEFT axis deviation (distinguishes from TOF which has right axis deviation) |
| Treatment | Palliative: BT shunt. Definitive: Fontan procedure (connects RA/IVC directly to pulmonary artery) |
🔴 LEFT axis deviation in a cyanotic newborn = Tricuspid Atresia (contrast: TOF = right axis deviation). Fontan circulation = single ventricle palliation.
TAPVC – Total Anomalous Pulmonary Venous Connection
Pulmonary veins drain to wrong location| Defect | All 4 pulmonary veins drain into RA or systemic veins instead of LA → oxygenated blood returns to right side |
| Subtypes | Supracardiac (most common), Cardiac, Infracardiac (most severe — obstructed), Mixed |
| Survival depends on | ASD must be present for blood to reach LA → systemic circulation |
| Obstructed TAPVC | Neonatal emergency — severe cyanosis + respiratory distress + pulmonary oedema from day 1 |
| X-ray (supracardiac) | "Snowman" or "Figure-8" appearance — enlarged cardiac silhouette |
| Treatment | Emergency surgery (obstructed type) or elective surgical repair reconnecting pulmonary veins to LA |
🔴 Obstructed TAPVC (infracardiac type) = one of the few true neonatal cardiac surgical emergencies. Snowman X-ray = Supracardiac TAPVC (non-obstructed).
Truncus Arteriosus
Single great vessel| Defect | Single large arterial trunk (instead of separate aorta + pulmonary artery) arising from both ventricles over a large VSD |
| Association | DiGeorge Syndrome (22q11 deletion) — check Ca²⁺ levels |
| Cyanosis | Mild to moderate — mixing of blood in single trunk |
| Presentation | Early heart failure + cyanosis; ↑ pulmonary blood flow |
| Treatment | Surgical correction (Rastelli procedure) in first weeks of life |
🔴 Always check calcium levels in Truncus Arteriosus — DiGeorge syndrome causes hypocalcaemia (absent parathyroid glands). Hypocalcaemia → tetany and seizures in neonate!
💚
Duct-Dependent Cyanotic Lesions: Some cyanotic CHDs depend on PDA for survival (e.g., Pulmonary Atresia, Critical PS, TGA). In these infants, PGE₁ (Prostaglandin E₁) infusion MUST be started immediately to keep the ductus arteriosus open until surgery. Never give Indomethacin (which closes PDA) in duct-dependent cyanotic CHD!
Obstructive defects involve narrowing or obstruction of cardiac valves or great vessels that impedes blood flow — without a shunt between the two sides of the heart. They cause pressure overload on the affected chamber → hypertrophy → heart failure if untreated.
🧠
Mnemonic – Obstructive Defects: "PACH"
Pulmonary Stenosis (PS)
Aortic Stenosis (AS)
Coarctation of Aorta (CoA)
Hypoplastic Left Heart Syndrome (HLHS)
PS – Pulmonary Stenosis
Most common obstructive lesion| Defect | Narrowing of pulmonary valve or RV outflow tract → obstruction to RV ejection into pulmonary artery |
| Association | Maternal Rubella (classic), Noonan Syndrome |
| Types | Valvular (most common), Infundibular, Supravalvular |
| Murmur | Ejection systolic murmur at pulmonary area (2nd left ICS) radiating to back; Ejection click |
| Cyanosis | Absent in mild/moderate; may develop in severe (if ASD also present) |
| ECG | Right axis deviation + RVH |
| Treatment | Balloon pulmonary valvuloplasty (catheter-based) — treatment of choice for valvular PS |
🟢 Balloon Valvuloplasty = treatment of choice for valvular PS. Associated with Maternal Rubella — "Rubella baby" often has PDA + PS combination!
AS – Aortic Stenosis
Obstruction to LV outflow| Defect | Narrowing of aortic valve or LV outflow tract → obstruction to LV ejection into aorta |
| Most Common Type | Bicuspid Aortic Valve (congenital valvular AS) — most common congenital valve anomaly |
| Classic Triad (severe AS) | Angina + Syncope + Heart Failure (SAD triad) |
| Murmur | Harsh ejection systolic murmur at aortic area (2nd right ICS) radiating to neck/carotids |
| Pulse | Slow-rising, small volume (pulsus parvus et tardus) |
| ECG | Left axis deviation + LVH |
| Risk | Sudden cardiac death in severe untreated AS — especially with exertion |
| Treatment | Balloon aortic valvuloplasty (children); surgical AVR in severe AS |
🟢 SAD triad = Syncope + Angina + Dyspnoea/Heart Failure = Severe AS. Survival without intervention after symptom onset: Angina ~5 yrs, Syncope ~3 yrs, Heart Failure ~2 yrs.
CoA – Coarctation of Aorta
Narrowing of descending aorta| Defect | Localised narrowing of descending aorta (usually at or just distal to ductus arteriosus / ligamentum arteriosum) |
| Classic Sign | UPPER LIMB HYPERTENSION + LOWER LIMB HYPOTENSION — BP difference >20 mmHg between arms and legs |
| Radiofemoral delay | Femoral pulse delayed compared to radial pulse — pathognomonic |
| Association | Turner Syndrome (45,XO) — most common cardiac lesion in Turner's |
| X-ray signs | "3 sign" on CXR (indentation at coarctation site) + Rib notching (due to collateral vessels — after age 5 years) |
| Neonatal CoA | Critical — duct-dependent; presents when PDA closes → severe heart failure + shock |
| Treatment | Balloon angioplasty ± stenting (older children); Surgical resection + end-to-end anastomosis |
🟢 "Rib notching on X-ray + upper limb HTN + lower limb ↓BP + absent femoral pulse = CoA" — this combination of signs is a classic NORCET question!
HLHS – Hypoplastic Left Heart Syndrome
Underdeveloped left heart| Defect | Severe underdevelopment of entire left side: hypoplastic LV, mitral valve atresia/stenosis, aortic valve atresia, hypoplastic ascending aorta |
| Result | Left heart cannot support systemic circulation → right heart must do all the work |
| Survival depends on | PDA + ASD for systemic blood flow; closes with ductus → collapse/death |
| Presentation | Severe cyanosis + circulatory shock in first 24–48 hrs when PDA closes |
| Immediate Rx | PGE₁ infusion + ICU stabilisation |
| Surgery | Norwood procedure (Stage I, newborn); Glenn procedure (Stage II, 4–6 months); Fontan procedure (Stage III, 2–4 years) |
| Prognosis | Guarded — 70–80% survival to school age with surgical staging |
🟢 HLHS = most severe form of CHD. Three-stage surgical palliation (Norwood → Glenn → Fontan) is the management pathway. Heart transplantation is an alternative.
👩⚕️ Nursing Management of Congenital Heart Disease
Cardiorespiratory Monitoring
- Continuous SpO₂ monitoring — report SpO₂ <90% immediately
- Monitor HR, RR, BP (all four limbs in CoA)
- Check colour — central cyanosis (lips, tongue) vs peripheral
- Watch for signs of heart failure: tachypnoea, tachycardia, hepatomegaly, oedema
- Daily weight — ↑ weight = fluid retention in CHF
- Monitor urine output (minimum 1 mL/kg/hr)
Feeding & Nutrition
- Infants with CHD fatigue easily during feeding
- Small, frequent feeds (every 2–3 hours) — reduce effort
- Soft nipple with large hole — reduces sucking effort
- Allow rest periods during feeding
- High-calorie formula if poor weight gain
- NG tube feed if oral feeding too exhausting
- Record feed intake, duration, tolerance
- Weigh infant before and after breastfeeding
Medication Management
- Digoxin — check apical HR for 1 full minute before each dose; withhold if HR <100 in infants
- Diuretics (Furosemide) — monitor electrolytes (K⁺), daily weight, urine output
- PGE₁ infusion — apnoea monitoring! Always have ventilator ready
- Indomethacin (PDA closure) — monitor renal function, platelet count
- Propranolol (Tet spells) — monitor HR, BP, blood glucose
- Anticoagulants post-surgery — monitor INR
Activity & Rest
- Balance rest and activity — avoid strenuous exertion
- Cluster nursing care to avoid fatigue
- For cyanotic CHD — allow squatting after activity (do NOT discourage)
- Acyanotic with CHF — reduce crying episodes (increase O₂ demand)
- Calm, quiet environment; non-stressful handling
- Elevate head of bed 30° for comfort and breathing
Prevention of Infective Endocarditis
- Strict oral hygiene — twice daily brushing
- Antibiotic prophylaxis before dental procedures (Amoxicillin)
- Avoid unnecessary invasive procedures
- Educate parents about signs of IE: fever, fatigue, new murmur, embolic phenomena
- All IV lines — strict aseptic technique
Family Education
- Explain diagnosis, treatment plan, surgery timeline
- Teach signs of deterioration — cyanosis, poor feeding, fast breathing
- Medication administration at home (dose, timing, what to watch for)
- Activity restrictions and when to seek help
- Regular cardiology follow-up schedule
- Importance of immunisations (RSV prophylaxis for complex CHDs)
- Encourage normal development and social interaction
🚨 Tet Spell Nursing Management
🚨
Tet Spell = Hypercyanotic Attack = Paediatric Cardiac Emergency! Occurs in TOF. Triggered by crying, defecation, feeding, fever, hot bath, morning waking. Child turns suddenly blue — may become unconscious.
| Priority | Action | Rationale |
|---|---|---|
| 1st | Knee-Chest (Squatting) Position | ↑ Systemic Vascular Resistance → ↓ R→L shunt → ↑ pulmonary blood flow → ↑ O₂ saturation |
| 2nd | Calm the child | Crying worsens hypercyanosis — reduce O₂ demand |
| 3rd | 100% O₂ via mask | Increase alveolar O₂ tension → improve saturation |
| 4th | IV Morphine 0.1 mg/kg | Reduces hyperpnoea (fast breathing) and anxiety; relaxes infundibulum |
| 5th | IV Propranolol | Relaxes infundibular (RV outflow) spasm → ↓ obstruction |
| 6th | IV Phenylephrine / Metaraminol | Alpha-agonist → ↑ SVR → ↓ R→L shunt |
| 7th | IV Sodium Bicarbonate | Correct metabolic acidosis → reduces respiratory drive → breaks cycle |
| 8th | IV Fluids | Correct hypovolaemia → ↑ preload → ↑ pulmonary blood flow |
📋 Key Comparisons – High-Yield for Exams
| Feature | VSD | ASD | PDA | TOF | CoA |
|---|---|---|---|---|---|
| Murmur Type | Pansystolic | Ejection systolic | Continuous (machinery) | Ejection systolic | Systolic (back) |
| Location | LLSB (4th ICS) | 2nd left ICS | 2nd left ICS | Left upper sternal | Left infraclavicular |
| Special sign | Thrill at LLSB | Fixed split S2 | Bounding pulse | Boot-shaped heart | Rib notching |
| Cyanosis | No (initially) | No (initially) | No (initially) | Yes | No |
| X-ray | ↑ Pulmonary vascularity | ↑ Pulmonary vascularity | ↑ Pulmonary vascularity | Boot-shaped | 3-sign + rib notching |
| Drug treatment | Diuretics for CHF | Not applicable | Indomethacin (close) | Propranolol (spells) | PGE₁ (critical CoA) |
📝 High-Yield MCQs – Congenital Heart Disease (NORCET 2025)
Q1. The MOST COMMON congenital heart disease overall is?
- A) Atrial Septal Defect (ASD)
- B) Patent Ductus Arteriosus (PDA)
- C) Ventricular Septal Defect (VSD)
- D) Tetralogy of Fallot (TOF)
💡 Tip: VSD = most common CHD overall (25–30%). ASD = 2nd most common acyanotic. TOF = most common CYANOTIC CHD. PDA = most common in premature infants. TGA = most common neonatal cardiac emergency requiring immediate intervention.
Q2. The 4 components of Tetralogy of Fallot are?
- A) ASD, VSD, Overriding Aorta, Pulmonary Stenosis
- B) Pulmonary Stenosis, VSD, Overriding Aorta, Right Ventricular Hypertrophy
- C) VSD, ASD, PDA, Aortic Stenosis
- D) Pulmonary Stenosis, Overriding Aorta, LVH, ASD
💡 Mnemonic – PROV: Pulmonary Stenosis (most important — determines cyanosis severity) + RVH + Overriding Aorta + VSD. Pulmonary Stenosis is the MOST IMPORTANT component. X-ray shows BOOT-SHAPED heart (coeur en sabot).
Q3. The PATHOGNOMONIC auscultatory finding of Atrial Septal Defect (ASD) is?
- A) Continuous machinery murmur
- B) Pansystolic murmur at left lower sternal border
- C) Fixed splitting of the second heart sound (S2)
- D) Ejection click followed by soft S2
💡 Tip: Fixed splitting of S2 = HALLMARK of ASD. Normally S2 splits only on inspiration. In ASD, RV always receives excess volume → delay in pulmonary valve closure is constant → S2 ALWAYS split regardless of respiration = FIXED SPLIT S2.
Q4. A child with TOF is having a hypercyanotic (Tet) spell. The FIRST nursing action is?
- A) Administer 100% oxygen by mask
- B) Give IV Morphine 0.1 mg/kg
- C) Place the child in knee-chest (squatting) position
- D) Administer IV Sodium Bicarbonate
💡 Tip: Knee-chest (squatting) position is the FIRST action — it increases systemic vascular resistance (SVR) → decreases R→L shunting → more blood goes to lungs → SpO₂ improves. Then: calm child → O₂ → Morphine → Propranolol → Phenylephrine → NaHCO₃.
Q5. The MOST characteristic murmur of Patent Ductus Arteriosus (PDA) is?
- A) Pansystolic murmur at left lower sternal border
- B) Ejection systolic murmur at 2nd right ICS
- C) Continuous "machinery" (Gibson) murmur at left 2nd ICS
- D) Mid-diastolic murmur at apex
💡 Tip: PDA = Continuous murmur (heard in BOTH systole and diastole) because the pressure difference between aorta and pulmonary artery exists throughout the cardiac cycle. Also: bounding/water-hammer pulse due to wide pulse pressure. Drug closure = Indomethacin.
Q6. Coarctation of Aorta is most commonly associated with which chromosomal disorder?
- A) Down Syndrome (Trisomy 21)
- B) DiGeorge Syndrome
- C) Turner Syndrome (45,XO)
- D) Marfan Syndrome
💡 Tip: Turner Syndrome (45,XO) → Coarctation of Aorta (most common CHD). Down Syndrome → AVSD/VSD. DiGeorge → TOF/Truncus. Marfan → Aortic root dilation. Rubella → PDA + PS. Lithium → Ebstein anomaly. MEMORISE these pairings!
Q7. The CLASSIC X-ray finding in Tetralogy of Fallot is?
- A) Snowman / Figure-8 appearance
- B) Egg on a string appearance
- C) Boot-shaped heart (Coeur en Sabot)
- D) 3-sign with rib notching
💡 Tip: Boot-shaped/Coeur en Sabot = TOF (upturned apex from RVH + concave pulmonary bay). Egg on string = TGA (narrow mediastinum). Snowman/Figure-8 = TAPVC (supracardiac). 3-sign + rib notching = CoA. These 4 X-ray signs are extremely high-yield!
Q8. Which drug is used to CLOSE the patent ductus arteriosus in premature infants?
- A) Prostaglandin E₁ (PGE₁)
- B) Furosemide
- C) Indomethacin (or Ibuprofen)
- D) Digoxin
💡 Tip: Indomethacin/Ibuprofen (NSAIDs) → inhibit prostaglandin synthesis → PDA closes. PGE₁ (Prostaglandin E₁) = KEEPS ductus OPEN (used in duct-dependent cyanotic CHD like TGA, critical PS). These are OPPOSITE actions — never confuse them!
Q9. Down syndrome (Trisomy 21) is MOST commonly associated with which congenital heart defect?
- A) Tetralogy of Fallot
- B) Coarctation of Aorta
- C) Atrioventricular Septal Defect (AVSD)
- D) Transposition of Great Arteries
💡 Tip: Down Syndrome → AVSD (Atrioventricular Septal Defect / Endocardial Cushion Defect) most commonly. 40–50% of Down Syndrome children have CHD. ECG finding in AVSD = LEFT axis deviation (superior axis) — another exam favourite!
Q10. The classic clinical finding that distinguishes Coarctation of Aorta from other CHDs is?
- A) Continuous machinery murmur
- B) Fixed split S2
- C) Hypertension in upper limbs with hypotension/absent pulse in lower limbs
- D) Central cyanosis with clubbing
💡 Tip: CoA = BP difference >20 mmHg between upper and lower limbs + radiofemoral delay + absent/weak femoral pulses. X-ray = 3-sign + rib notching (after age 5). Always check BP in ALL FOUR LIMBS in newborns — this is how CoA is detected!
Q11. The MOST COMMON cyanotic congenital heart disease is?
- A) Transposition of Great Arteries
- B) Tricuspid Atresia
- C) Tetralogy of Fallot (TOF)
- D) Total Anomalous Pulmonary Venous Connection
💡 Tip: TOF = most common cyanotic CHD (65–70% of all cyanotic CHDs beyond newborn period). TGA = most common cyanotic CHD presenting as NEONATAL EMERGENCY in first 24 hours. Tricuspid Atresia = LEFT axis deviation (vs TOF = right axis deviation).
Q12. A nurse is giving Digoxin to a 6-month-old with VSD and heart failure. The nurse should withhold the dose and call the physician if?
- A) Heart rate is 130 bpm
- B) The infant is crying
- C) Apical heart rate is less than 100 bpm
- D) SpO₂ is 96%
💡 Tip: Digoxin withhold parameters: Infants = HR <100 bpm | Children = HR <70 bpm | Adults = HR <60 bpm. Always check APICAL pulse for 1 full minute before Digoxin. Also check for signs of toxicity: nausea, vomiting, bradycardia, visual changes (yellow-green halos in older children).
Q13. Eisenmenger Syndrome occurs when?
- A) Cyanotic CHD becomes acyanotic after surgery
- B) Two defects combine to form a new defect
- C) Long-standing L→R shunt causes pulmonary hypertension → shunt reverses to R→L → cyanosis develops
- D) Surgical correction fails in TOF
💡 Tip: Eisenmenger = irreversible end-stage complication of untreated acyanotic CHDs (VSD, ASD, PDA). Progressive pulmonary HTN → pulmonary vascular resistance exceeds systemic → shunt reverses to R→L → cyanosis appears. Surgery is CONTRAINDICATED at this stage (only option = heart-lung transplant).
Q14. The Rashkind procedure (Balloon Atrial Septostomy) is used in the management of?
- A) Coarctation of Aorta
- B) Ventricular Septal Defect
- C) Transposition of Great Arteries (TGA)
- D) Tetralogy of Fallot
💡 Tip: In TGA, oxygenated and deoxygenated circuits run in parallel — no mixing = incompatible with life. Rashkind procedure = balloon catheter creates/enlarges ASD → allows mixing of blood (palliative). Followed by Arterial Switch Operation (Jatene) = definitive cure within 2 weeks of birth.
Q15. When feeding an infant with congenital heart disease and cardiac failure, the nurse should?
- A) Give large feeds every 6 hours to allow maximum rest
- B) Position the infant flat during feeding
- C) Give small, frequent feeds every 2–3 hours and allow rest periods during feeding
- D) Use a very firm nipple to strengthen jaw muscles
💡 Tip: Feeding = effort/exercise for infants with CHD → increases O₂ demand → fatigue, sweating, desaturation. Small frequent feeds = less effort per feed. Soft nipple with large hole = less sucking effort. Allow rest breaks. Upright/semi-upright position. NG feeds if oral feeding too exhausting.
⚡ Quick Reference – Congenital Heart Disease
Most Common CHD
VSD (25–30%)
Most Common Cyanotic
TOF (65–70% of cyanotic)
Neonatal Emergency
TGA → PGE₁ + Rashkind
VSD Murmur
Pansystolic at LLSB
ASD Sign
Fixed Split S2
PDA Murmur
Machinery (continuous)
PDA Drug (close)
Indomethacin
PDA Drug (keep open)
PGE₁
TOF X-ray
Boot-shaped heart
TGA X-ray
Egg on a string
TAPVC X-ray
Snowman / Figure-8
CoA X-ray
3-sign + rib notching
Tet Spell Position
Knee-chest (squatting)
TOF Components
PROV (PS+RVH+OA+VSD)
Down Syndrome CHD
AVSD
Turner Syndrome CHD
CoA
Rubella CHD
PDA + PS
Lithium → CHD
Ebstein Anomaly
Digoxin hold (infant)
HR <100 bpm
Eisenmenger
L→R becomes R→L
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