A 45-year-old woman presents with clubbing and cyanosis. Chest X-ray shows a prominent pulmonary artery. Which congenital heart disease should be considered?

Atrial septal defect (ASD) with Eisenmenger syndrome.

Patent ductus arteriosus (PDA) with Eisenmenger syndrome.

Pulmonary plethora in a child presenting with cyanosis, is seen in?

Total Anomalous Pulmonary Venous Connection (TAPVC)

A 6-year-old with congenital heart disease presents with fever, new-onset murmur, and petechiae. Blood cultures are pending, but initial Gram stain shows Gram-positive cocci. What is the most appropriate initial intervention?

Start broad-spectrum antibiotics

Schedule for urgent valve replacement

Wait for susceptibility testing

Congenital Heart Diseases: Cyanotic for INI-CET: High-Yield Pediatrics Lessons

Cyanotic CHDs: Overview - Blue Babies Basics

Result from critical right-to-left (R→L) shunts; deoxygenated blood bypasses lungs, entering systemic circulation.
Hallmark: Central cyanosis ("blue babies" - lips, tongue, nail beds). Clubbing is a later, chronic sign.
📌 Common causes (Mnemonic: 5 T's):
- Tetralogy of Fallot (TOF)
- Transposition of Great Arteries (TGA)
- Tricuspid Atresia
- Truncus Arteriosus
- Total Anomalous Pulmonary Venous Return (TAPVR)
Many are duct-dependent for survival (PGE1 infusion vital). Classified by Pulmonary Blood Flow (PBF):

Tetralogy of Fallot abnormalities

⭐ Most cyanotic CHDs present with cyanosis in the neonatal period or early infancy, often worsening with crying or feeding.

Tetralogy of Fallot (TOF) - Four Faults Fury

Most common cyanotic CHD after 1 year. 📌 PROVe for components:
- Pulmonary Infundibular Stenosis (determines severity, RVOTO)
- Right Ventricular Hypertrophy (RVH)
- Overriding Aorta (receives blood from both ventricles)
- Ventricular Septal Defect (VSD - large, malaligned)
Symptoms: Cyanosis (episodic "tet spells" with O2 saturation often <70%), dyspnea on exertion, clubbing. Failure to thrive.
CXR: "Boot-shaped heart" (Coeur en sabot); normal or decreased pulmonary vascularity.
ECG: Right axis deviation, RVH. Echocardiography confirms diagnosis.
Management of Tet Spells:

⭐ Squatting (or child assuming knee-chest position) increases systemic vascular resistance (SVR), reducing the right-to-left shunt, thus improving pulmonary blood flow and oxygenation during a tet spell. This is a classic physiological maneuver tested frequently.

Transposition of Great Arteries (TGA) - Switched Vessels Saga

Patho: Aorta from RV, PA from LV (ventriculoarterial discordance) → two parallel circulations.
Clinical: Severe cyanosis from birth ("blue baby"), tachypnea, loud single S2. Often "quiet tachypnea".
Investigations:
- CXR: "Egg-on-string" sign; narrow superior mediastinum.
- ECG: Right axis deviation (RAD), RV hypertrophy (RVH).
- Echocardiogram: Diagnostic.
Management:
- Immediate: $PGE_1$ dose: 0.05-0.1 mcg/kg/min to maintain PDA patency.
- Balloon Atrial Septostomy (Rashkind) for poor mixing.
- Definitive: Arterial Switch Operation (Jatene) within 2 weeks.
📌 Mnemonic: Two Great Arteries Switched.

⭐ Survival in TGA is dependent on mixing between pulmonary and systemic circulations (e.g., via ASD, VSD, or PDA).

Other Key Cyanotic CHDs - The Rarer Blues Crew

Focus on distinguishing features of less common cyanotic heart diseases.
Early recognition and intervention are critical.

Feature	Tricuspid Atresia	Total Anomalous Pulmonary Venous Return (TAPVR)	Truncus Arteriosus
Core Defect	No Tricuspid Valve, hypoplastic RV	Pulm. veins to RA/systemic veins (not LA)	Single arterial trunk (Aorta+PA)
CXR	↓Pulm. Vasc. Markings, "Box-shaped heart"	"Snowman sign" (supracardiac), ↑PVM (unobstructed)	Cardiomegaly, ↑PVM, Rt aortic arch (30%)
ECG	LAD, RAE, LVH (📌 Tall And Left for TA)	RAD, RVH	Biventricular Hypertrophy (BVH)
Key Association	ASD/VSD essential	ASD essential	VSD always present; DiGeorge syndrome (22q11 deletion)
Murmur	VSD murmur if present; single S2	Systolic Ejection Murmur, widely split fixed S2 (if ASD)	Single loud S2, ejection click, harsh systolic murmur

High‑Yield Points - ⚡ Biggest Takeaways

Tetralogy of Fallot (TOF): Most common cyanotic CHD; "boot-shaped" heart; tet spells relieved by squatting.

Transposition of Great Arteries (TGA): Most common in newborns; "egg-on-string" sign; requires PGE1 for ductal patency.

Prostaglandin E1 (PGE1) is vital for duct-dependent lesions.

Ebstein's anomaly: Maternal lithium association; atrialized right ventricle.

TAPVR (supracardiac): "Snowman sign" or "figure of 8" on CXR.

Truncus Arteriosus: Single arterial trunk, often with DiGeorge syndrome.

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Congenital Heart Diseases: Cyanotic