Definition: Congenital heart disease (CHD) is a structural abnormality of the heart or great vessels present at birth. It is the most common congenital malformation, affecting approximately 8 per 1,000 live births. In the GCC, rates are higher due to consanguinity.
Blood shunts from high-pressure left side to low-pressure right side. Lungs become over-circulated. Cyanosis absent unless Eisenmenger syndrome develops (pulmonary hypertension reverses shunt).
Deoxygenated blood enters systemic circulation. Presents with central cyanosis. Often duct-dependent in neonates — prostaglandin E1 is life-saving.
VSD + pulmonary stenosis + overriding aorta + RVH. Most common cyanotic CHD.
Aorta arises from RV, pulmonary artery from LV. Neonatal emergency. PGE1 + arterial switch.
Single truncal vessel. Early surgery required. Associated with DiGeorge syndrome (22q11).
Absent tricuspid valve. Requires systemic-pulmonary shunt then Fontan palliation.
Total Anomalous Pulmonary Venous Return. Obstruction is surgical emergency — severe cyanosis, pulmonary oedema.
Pulmonary Atresia is sometimes listed as a 6th T variant. Always verify with local exam board guidelines.
Universal pulse oximetry screening at 24–36 hours of life detects critical CHD before clinical deterioration. Performed on right hand (pre-ductal) and either foot (post-ductal).
FAIL criteria — refer for urgent echocardiography:
SpO₂ <95% in right hand OR foot on any of 3 measurements
Difference >3% between right hand and foot
GCC Context: Higher CHD rates in GCC due to consanguinity and autosomal recessive syndromes. Saudi Arabia and UAE have established premarital genetic counselling programmes to identify at-risk couples. Nurses play a key role in family education post-diagnosis.
Left-to-right shunt at ventricular level. Volume overload of left ventricle and pulmonary circulation. Small VSDs may close spontaneously by age 2. Large VSDs cause pulmonary hypertension, heart failure, failure to thrive.
Usually asymptomatic in childhood. Right heart volume overload. May present in adulthood with atrial fibrillation, pulmonary hypertension, stroke (paradoxical embolism). Fixed wide splitting of S2 is classic.
Medical closure: Indomethacin (COX inhibitor) or ibuprofen IV — inhibits prostaglandin synthesis. Monitor renal function, platelet count, urine output during treatment.
Surgical ligation if medical management fails (VATS or open thoracotomy).
Symptomatic management initially. Transcatheter coil/device closure in cath lab when haemodynamically significant. Continuous machinery murmur (under left clavicle). Bounding pulses, wide pulse pressure.
CRITICAL — PDA-dependent circulation: In duct-dependent lesions (pulmonary atresia, critical AS, interrupted aortic arch, critical coarctation), the PDA must remain open. Start Prostaglandin E1 (alprostadil) immediately. Monitor for PGE1 side effects: apnoea (have airway equipment ready), fever, hypotension, cortical hyperostosis with prolonged use.
Complete repair at 4–6 months of age (patch VSD + relieve RVOTO). Prior to surgery: propranolol to reduce spells, consider Blalock-Taussig shunt if very symptomatic early.
Immediate Actions (in order):
Aorta arises from RV; pulmonary artery from LV. Two parallel circulations — only mixing occurs at ASD/VSD/PDA. Profoundly cyanotic from birth. Blood is well-oxygenated in lungs but cannot reach systemic circulation.
PICU nursing post-cardiac surgery requires specialist training. All values listed are general guidance only — refer to local cardiac PICU protocols, cardiac surgeon, and paediatric cardiologist instructions for individual patient management.
Infusion safety: Use concentration-standardised infusions per cardiac PICU protocol. Double-check with second nurse. Never stop vasoactives abruptly. Label all infusions clearly. Check infusion pump settings hourly.
Most feared post-operative complication. Peak incidence 6–18 hours post-bypass. Cardiac output insufficient to meet metabolic demands. ESCALATE IMMEDIATELY to senior.
Temporary epicardial pacing wires are routinely placed during cardiac surgery for management of post-operative arrhythmias and heart block. Usually 2 ventricular + 2 atrial + 1 ground wire.
Target: commence enteral feeds within 24–48 hours post-cardiac surgery when haemodynamically stable. Early nutrition reduces catabolism, infection risk, and improves wound healing.
Fontan palliation is used for univentricular hearts (e.g. tricuspid atresia, hypoplastic left heart syndrome, double inlet LV). A Total Cavopulmonary Connection (TCPC) routes all systemic venous return directly to the pulmonary arteries — passive pulmonary blood flow driven by venous pressure alone, with no subpulmonary ventricle.
Fontan is NOT a cure — it is palliation. The single ventricle is volume-unloaded but chronically elevated systemic venous pressure leads to multi-organ complications.
Normal for Fontan patients: SpO₂ 75–85%. Do NOT target 95%+ — this is not physiologically achievable and inappropriate oxygen supplementation is unhelpful. Alarm limits must be set accordingly.
Chronic elevated systemic venous pressure causes hepatic venous congestion → progressive liver fibrosis. Present in virtually all Fontan patients after years. LFT monitoring at every annual review. Liver USS ± elastography for surveillance. Liver biopsy if cirrhosis suspected. Hepatocellular carcinoma risk — AFP screening.
Protein loss through gut mucosa secondary to elevated venous pressure. Features: low albumin (<25 g/L), peripheral oedema, ascites, diarrhoea, malnutrition. Poor prognosis — 50% 5-year mortality. Treatment: high-protein diet, albumin infusions, diuretics, consider cardiac catheterisation to optimise Fontan pressures, cardiac transplant in severe cases.
Thick rubbery bronchial casts form in airways — can cause acute airway obstruction and respiratory arrest. Rare but life-threatening. Treatment: chest physiotherapy, bronchoscopic cast removal, inhaled heparin, tissue plasminogen activator (tPA), dietary modifications (medium-chain triglycerides). May require cardiac transplant.
Low-flow Fontan circuit predisposes to intracardiac thrombus and pulmonary emboli. All Fontan patients on anticoagulation (warfarin INR 2–2.5) or aspirin. Avoid dehydration — increases thrombus risk significantly. Atrial flutter/fibrillation greatly increases clot risk — urgent cardioversion.
The Fontan circulation is entirely passive — any reduction in venous return or increase in pulmonary vascular resistance will critically impair cardiac output.
Higher risk in: HLHS, TGA, TAPVR (hypoxia/bypass injury). Risk factors: cardiopulmonary bypass time, deep hypothermic circulatory arrest, genetic syndromes (Down, DiGeorge, Turner).
Early intervention referral — physiotherapy, speech therapy, occupational therapy, educational psychology. Do not wait for diagnosis — refer at risk.
Refer to paediatric psychology early. Whole-family psychological support integral to care.
CHD diagnosed prenatally or at birth is an acute family crisis. Parents experience grief, guilt, and acute anxiety. Nurse's role: clear, compassionate communication; avoid jargon; allow time for questions; involve cardiac liaison nurse.
GCC context: Consanguineous marriages increase risk of autosomal recessive syndromes with CHD. Premarital counselling programmes in Saudi Arabia, UAE, Qatar actively screen for carrier status. Genetic counsellor referral is standard of care in GCC tertiary cardiac centres.
In GCC cultures, medical decisions frequently involve extended family networks — grandparents, paternal relatives — not only the parents. Nurses must be culturally sensitive to this dynamic while ensuring consent is appropriately documented.
In GCC paediatric nursing, the mother is the primary caregiver and point of contact. Discharge education, feeding instructions, medication training, and home monitoring must be comprehensively provided to and confirmed understood by the mother.
Provide written discharge instructions in Arabic. Use interpretation services — do not rely on family members to interpret complex medical information. Use diagrams and visual aids for cardiac anatomy explanation.
Some CHD diagnoses carry extremely poor prognosis despite surgery: Trisomy 18, Trisomy 13 (surgical outcomes do not improve survival meaningfully), severe HLHS with additional anomalies, end-stage Fontan failure.
Over 90% of children with CHD now survive to adulthood. The transition from paediatric to adult cardiology services is a high-risk period for loss to follow-up, non-adherence, and adverse events.
Transition clinic: Joint paediatric/adult appointments to introduce the ACHD team. Young person should be seen alone (without parents) for part of the consultation to foster independence.
| Feature | Acyanotic CHD | Cyanotic CHD |
|---|---|---|
| Shunt direction | Left → Right | Right → Left |
| Cyanosis at rest | Absent (unless Eisenmenger) | Present (central) |
| Pulmonary blood flow | Increased (overcirculation) | Decreased (most) or mixed |
| Main examples | VSD, ASD, PDA, coarctation | ToF, TGA, tricuspid atresia, TAPVR |
| Commonest overall | VSD (most common CHD) | Tetralogy of Fallot |
| Key nursing alert | Cardiac failure, feeding difficulty | Hypoxic spells, PGE1 dependency |
| SpO₂ target | Normal 95–100% | Disease-specific (Fontan: 75–85%) |
High-yield exam question: What is the first-line management of a hypercyanotic spell in Tetralogy of Fallot?
Answer: Knee-chest position (or squatting) — increases systemic vascular resistance → decreases right-to-left shunt → increases pulmonary blood flow.
| Step | Intervention | Mechanism / Dose |
|---|---|---|
| 1 | Knee-chest / squat position | Increases SVR → reduces R-L shunt → more blood to lungs |
| 2 | High-flow O₂ | Reduces hypoxic pulmonary vasoconstriction |
| 3 | IV/IM Morphine | 0.1–0.2 mg/kg — reduces infundibular spasm, calms child |
| 4 | IV Fluid bolus | 10 ml/kg — increases preload and pulmonary blood flow |
| 5 | IV Propranolol | 0.01–0.1 mg/kg — beta-blockade relaxes infundibulum |
| 6 | Sodium bicarbonate | If severe acidosis — improves myocardial function |
| 7 | Escalate / phenylephrine | Alpha agonist — increases SVR; emergency repair if refractory |
| Context | Management |
|---|---|
| Preterm (<37 weeks) | Medical: indomethacin or ibuprofen IV (COX inhibitors). Monitor renal, GI, platelet. Surgical ligation if medical fails. |
| Term infant — asymptomatic | Observe — many close spontaneously. Transcatheter closure if no closure by 1 year. |
| Term — symptomatic (CCF) | Diuretics for cardiac failure. Transcatheter coil/device closure electively. Surgical ligation rarely needed in modern era. |
| Duct-dependent lesion | KEEP OPEN with PGE1 (alprostadil). Do NOT close — child will die. Urgent surgical intervention required. |
Practice questions aligned with DHA, DOH (Abu Dhabi), SCFHS, QCHP, and MOH Kuwait licensing examination formats.