Master Siddharth, a 6 month old boy, 2nd order child born of a non-consanguineous marriage from Madurai, Tamil Nadu presented with complaints of difficulty in breathing and fast breathing since 2 months of age, feeding difficulty with excessive forehead sweating since 2.5 months of age, and failure to gain weight.

HOPI

The history is dated back to 2 months of age when the mother first noticed fast breathing in the child while at rest.

• Difficulty in Breathing / Fast Breathing:
  • Noticed since 2 months of age, insidious in onset and gradually progressive.
  • Present throughout the day, persistent even during sleep.
  • Associated with lower chest wall indrawing (subcostal and intercostal retractions) Points to decreased lung compliance from pulmonary venous and capillary congestion.
  • Exacerbated during feeding and crying; no positional relief.
• Feeding Difficulties (Infantile Heart Failure):
  • Mother noticed that the baby was unable to breastfeed continuously since 2.5 months of age.
  • Baby latches on, sucks for 1-2 minutes, leaves the breast breathless and exhausted, rests for 3-5 minutes, and sucks again (suck-rest-suck cycle).
  • Total feeding duration exceeded 40-45 minutes per feed with baby falling asleep exhausted without satiety.
  • Associated with excessive cold diaphoresis exclusively over the forehead and scalp during feeds Reflects maximal adrenergic sympathetic discharge to maintain stroke volume during feeding exertion.
• Failure to Gain Weight (Growth Faltering):
  • Birth weight was 2.9 kg. Current weight at 6 months is 4.8 kg (expected ~7.5 kg).
  • Mother noted loose clothes and prominent ribs over the past 3 months despite frequent nursing attempts.
• Recurrent Lower Respiratory Infections:
  • History of two episodes of fever, worsening fast breathing, and cough requiring hospitalization at 3 months and 5 months of age, treated with intravenous antibiotics and nebulization Hyperdynamic pulmonary circulation with engorged pulmonary vessels compresses bronchioles, impairing mucus clearance and predisposing to recurrent infections.
• Negative History:
  • No history of bluish discoloration of lips, tongue, oral mucosa, or nail beds at rest or during crying Rules out cyanotic congenital heart disease and shunt reversal (Eisenmenger syndrome).
  • No history of paroxysmal hyperpnea, severe irritability followed by limpness, or squatting equivalents Rules out hypoxic/cyanotic spells typical of Tetralogy of Fallot.
  • No history of prolonged unexplained fever, petechial rashes, hematuria, or painful skin lesions Rules out infective endocarditis.
  • No history of facial puffiness, abdominal distension, or pedal swelling Rules out predominant right-sided systemic venous congestion.
  • No history of stridor, hoarseness of cry, or dysphagia Rules out vascular ring compressing trachea/esophagus and Ortner syndrome (left recurrent laryngeal nerve compression by dilated pulmonary artery).
  • No history of maternal gestational diabetes, teratogenic drug intake (lithium, phenytoin), or rash in the first trimester Rules out syndromic/teratogenic cardiac embryopathy.

Past History

• History of two hospital admissions for severe bronchopneumonia with heart failure at 3 and 5 months of age, managed with oxygen, IV furosemide, and oral enalapril.
• No history of neonatal seizures, jaundice requiring phototherapy, or prior cardiac catheterization.

Family history

• Born of second-degree consanguineous marriage (parents are maternal first cousins).
• Father 32 years, factory employee; mother 28 years, homemaker. Both healthy.
• Elder sibling (female, 3.5 years) is asymptomatic with normal growth and no murmur.
• No family history of sudden cardiac death, congenital heart defects, cardiomyopathy, or early pacemaker implantation.

Immunization history

• Received BCG, OPV-0, and Hepatitis B at birth.
• Received Pentavalent (1, 2, 3), Rotavirus, PCV, and fIPV at 6, 10, and 14 weeks as per the National Immunization Schedule (UIP).
• Optional vaccines: Annual Influenza and Hepatitis A not yet administered.

Dietary history

• Exclusively breastfed till 5.5 months of age.
• Thin rice gruel and diluted cow's milk introduced 2 weeks ago (inadequate complementary feeding).
• Mother feeds 6-7 times in 24 hours, but effective intake is limited due to suck-rest-suck fatigue.

Food Item	Quantity	Calories (kcal)	Protein (g)
Breast milk	~400 mL effective	268	4.4
Rice gruel (watery)	50 mL	25	0.4
Diluted cow's milk (1:1)	100 mL	33	1.6
Total Observed Intake	—	326 kcal	6.4 g

24-Hour Recall Deficit Analysis

$$ ext{Ideal Body Weight (IBW for 6 months, 50th centile WHO)} = 7.9 ext{ kg} $$

Nutrient	Expected Intake (ICMR-NIN 2024 for IBW 7.9 kg)	Observed Intake	Deficit	Percentage Deficit
Energy (kcal)	$7.9 ext{ kg} imes 90 ext{ kcal/kg} = 711 ext{ kcal}$	326 kcal	385 kcal	54.1% Deficit
Protein (g)	$7.9 ext{ kg} imes 1.25 ext{ g/kg} = 9.88 ext{ g}$	6.40 g	3.48 g	35.2% Deficit

The expected calories and proteins should be calculated from the ideal body weight, not from current weight.

Socioeconomic and KAP

• Belongs to Modified BG Prasad Socioeconomic Class III (Middle Class).
• Urban-rural semi-pucca house with municipal tap water supply and adequate ventilation.
• Parents understand that the child has a "hole in the heart" requiring specialized surgical repair, but were hesitant due to financial constraints and fear of surgery.

Summary of History

Master Siddharth, a 6-month-old male infant, 2nd order child born of consanguineous parentage, presented with persistent tachypnea, feeding fatigue with suck-rest-suck pattern, forehead diaphoresis, failure to thrive, and recurrent lower respiratory tract infections since 2 months of age, without history of central cyanosis, cyanotic spells, or infective endocarditis features.

I would like to think of a Congenital Heart Disease, Acyanotic type, with a Left-to-Right Shunt (likely Large Ventricular Septal Defect or Patent Ductus Arteriosus), complicated by Congestive Cardiac Failure and Hyperdynamic Pulmonary Arterial Hypertension, with severe acute malnutrition.

General head to toe examination

• Child Behavioral State: Examined in quiet wakefulness (Prechtl State 3), resting comfortably on mother's lap in propped-up position, non-crying.
• Vitals:
  • Heart Rate: 154 beats/minute (tachycardia), regular, normal volume, all peripheral pulses (radial, brachial, femoral, dorsalis pedis) palpable bilaterally; no radio-femoral delay, no bounding pulses.
  • Respiratory Rate: 62 breaths/minute (tachypnea), thoracoabdominal, with prominent subcostal and intercostal retractions and mild alar flaring.
  • Blood Pressure: Right upper limb (supine, appropriate cuff): $82/48 ext{ mmHg}$ ($50^{ ext{th}}$ centile for age/sex).
  • Temperature: $36.8^\circ ext{C}$ (afebrile).
  • Oxygen Saturation ($SpO_2$): 96% on room air in right upper limb and both lower limbs.
• Anthropometry:

Parameter	Observed	Expected (50th WHO)	Z-score / Centile	Inference
Weight	4.8 kg	7.9 kg	$< -3 ext{ SD}$	Severe Underweight
Length	63 cm	67.6 cm	$-2 ext{ to } -3 ext{ SD}$	Moderate Stunting
Weight-for-Length	4.8 kg for 63 cm	6.8 kg	$< -3 ext{ SD}$	Severe Acute Malnutrition (Wasting)
Head Circumference	41.5 cm	43.3 cm	$-1 ext{ to } -2 ext{ SD}$	Normal / Sparing
Mid-Upper Arm Circumference	11.2 cm	>12.5 cm	$< 11.5 ext{ cm}$	Severe Wasting

• Head to Toe Findings:
  • Pallor present (mild conjunctival and palmar).
  • No central or peripheral cyanosis, no clubbing, no pedal edema.
  • Dysmorphic features: No epicanthic folds, no flat facial profile, no low-set ears (Down syndrome features absent).
  • BCG scar present over left deltoid (4 mm).

Systemic Examination

Cardiovascular System

• Inspection:
  • Chest shape: Precordial bulge present over the left parasternal region with visible hyperdynamic cardiac pulsations.
  • Apical impulse: Visible in the left $5^{ ext{th}}$ intercostal space, $1 ext{ cm}$ lateral to the midclavicular line.
  • Epigastric pulsations and left parasternal pulsations visible.
  • No dilated superficial veins or surgical scars.
• Palpation:
  • Apical Impulse: Palpable in the left $5^{ ext{th}}$ intercostal space, $1 ext{ cm}$ lateral to the midclavicular line; hyperdynamic in character (volume overload of left ventricle).
  • Parasternal Heave: Grade 2/3 left parasternal heave present along the left $3^{ ext{rd}}$ and $4^{ ext{th}}$ intercostal spaces (right ventricular hypertrophy from PAH).
  • Palpable Heart Sounds: Palpable second heart sound ($P_2$) in the left $2^{ ext{nd}}$ intercostal space (pulmonary area).
  • Thrill: Systolic thrill palpable along the left lower sternal border ($3^{ ext{rd}}-4^{ ext{th}}$ intercostal space), best felt in expiration with the child sitting forward.
• Percussion:
  • Right heart border percussed along the right parasternal line in the $4^{ ext{th}}$ intercostal space (right atrial dilatation).
  • Left heart border percussed outside the midclavicular line in the $5^{ ext{th}}$ intercostal space.
  • Upper border of liver dullness percussed in the right $5^{ ext{th}}$ intercostal space.
• Auscultation:
  • First Heart Sound ($S_1$): Normal intensity, best heard at the apex.
  • Second Heart Sound ($S_2$): Split is narrow but physiological; pulmonary component ($P_2$) is loud and accentuated, clearly heard at the apex and louder than $A_2$ at the base (indicates Pulmonary Arterial Hypertension).
  • Third Heart Sound ($S_3$): Present at apex (reflects rapid diastolic ventricular filling).
  • Murmur 1 (Regurgitant Ventricular Shunt):
    • Grade 3/6, harsh pansystolic (holosystolic) murmur heard best at the left lower sternal border ($3^{ ext{rd}}$ and $4^{ ext{th}}$ intercostal space).
    • Radiation: Radiates widely across the precordium; does not radiate to the axilla or back.
  • Murmur 2 (Relative Mitral Stenosis / Carey-Coombs type flow rumble):
    • Soft, low-pitched mid-diastolic rumble (Grade 2/6) heard best at the cardiac apex using the bell of the stethoscope in left lateral position (indicates large left-to-right shunt with $Q_p : Q_s > 2 : 1$ generating torrent flow across the normal mitral valve orifice).

Modified Ross Heart Failure Score

Clinical Parameter	Finding in Patient	Ross Score Assigned
Feeding History	Takes >40 min, suck-rest-suck cycle	2
Respiratory Rate	62 breaths/min ($>60 ext{ bpm}$)	2
Respiratory Pattern	Marked subcostal & intercostal retractions	2
Heart Rate	154 beats/min ($>150 ext{ bpm}$)	2
Hepatomegaly	Liver 3.5 cm palpable below right costal margin	2
Peripheral Perfusion	Warm peripheries, CRT < 2 seconds	0
Total Modified Ross Score	—	10 / 12 (Severe Heart Failure)

Score Interpretation: 0–2: No HF; 3–6: Mild HF; 7–9: Moderate HF; 10–12: Severe HF.

other systems

• Respiratory System:
  • Tachypnea with bilateral subcostal and intercostal retractions.
  • Auscultation: Bilateral symmetrical vesicular breath sounds; coarse transmission crackles and fine bibasilar crepitations heard bilaterally.
• Abdomen:
  • Soft, non-distended; no superficial venous collaterals.
  • Liver: Palpable 3.5 cm below the right costal margin in the midclavicular line; span 7.5 cm; soft, smooth surface, tender, round margin (congestive hepatomegaly).
  • Spleen: Not palpable; no free fluid (no shifting dullness).
• Central Nervous System:
  • Conscious, alert, irritable on handling; anterior fontanelle normotensive (flat, soft).
  • Cranial nerves intact; normal neonatal and infant developmental reflexes for 6 months.

Summary

Master Siddharth, a 6-month-old male infant, second born of second-degree consanguineous parentage, presented with history of insidious, progressive tachypnea, suck-rest-suck feeding fatigue, forehead diaphoresis, failure to thrive, and recurrent lower respiratory tract infections since 2 months of age, without history of central cyanosis or infective endocarditis.

On examination, the infant has severe wasting ($<-3 ext{ SD}$ weight-for-length), resting tachycardia ($154 ext{ bpm}$), tachypnea ($62 ext{ cpm}$) with retractions, hyperdynamic precordium, left parasternal heave (grade 2/3), palpable thrill and loud $P_2$, a Grade 3/6 harsh pansystolic murmur at the left lower sternal border, and a Grade 2/6 mid-diastolic flow rumble at the apex, associated with congestive hepatomegaly ($3.5 ext{ cm}$) and a Modified Ross Score of 10/12.

Probable Clinical Diagnosis: Congenital Acyanotic Heart Disease with a Left-to-Right Shunt, anatomically consistent with a Large Perimembranous Ventricular Septal Defect (VSD), complicated by Severe Congestive Cardiac Failure (Modified Ross Class IV / Score 10), Hyperdynamic Pulmonary Arterial Hypertension (PAH), without clinical evidence of shunt reversal (Eisenmenger syndrome) or infective endocarditis, in a background of Severe Acute Malnutrition (SAM without edema).

Differential Diagnosis

Disease	Points IN FAVOR	Points AGAINST
Large Perimembranous VSD	• Onset at 2 months (physiological PVR drop) • Precordial bulge, systolic thrill at LLSB • Harsh holosystolic murmur at left 4th ICS • Apical mid-diastolic flow murmur ($Q_p:Q_s > 2:1$) • Loud $P_2$ + parasternal heave (PAH)	Primary Diagnosis
Patent Ductus Arteriosus (PDA)	• Left-to-right shunt physiology • CCF, FTT, recurrent LRTI • Wide pulse pressure signs	• Pulses are normal volume (not collapsing / bounding) • Murmur is pansystolic at LLSB, not continuous "machinery" murmur at left 1st/2nd infraclavicular space
Ostium Secundum ASD	• Acyanotic CHD with left-to-right shunt • Precordial hyperactivity + parasternal heave	• Large ASD rarely causes severe CCF and FTT at 6 months • Murmur is pansystolic with thrill (ASD has soft ESM at pulmonary area with fixed wide split $S_2$)
Atrioventricular Septal Defect (AVSD)	• Early severe heart failure & marked PAH • Common in consanguinity / Down syndrome	• No syndromic stigmata of Down syndrome • ECG typically shows superior axis ($-30^\circ ext{ to } -90^\circ$); murmur lacks predominant AV valve regurgitant radiation

Investigation Protocol & Diagnostic Workup

flowchart TD
    A["Infant with Left-to-Right Shunt & CCF (Master Siddharth)"] --> B["1. Non-Invasive Bedside Tests"]
    B --> C["Chest X-Ray (CXR PA)"]
    B --> D["12-Lead Electrocardiogram (ECG)"]
    B --> E["Pulse Oximetry (Pre & Post-ductal)"]
    
    A --> F["2. Definitive Confirmatory Imaging"]
    F --> G["Transthoracic Echocardiography (TTE) + Color Doppler"]
    G --> H["Define VSD Location, Size, Shunt Direction & Peak Gradient"]
    G --> I["Estimate RVSP / PASP via TR Jet Velocity"]
    G --> J["Assess LA/LV Dilatation and LVEF"]
    
    A --> K["3. Laboratory & Metabolic Profile"]
    K --> L["CBC, Serum Electrolytes, Renal Function, NT-proBNP"]
    K --> M["ABG: Assess Acid-Base Status & PaO2"]

1. Chest Radiography (CXR - Anteroposterior View)

• Cardiomegaly: Cardiothoracic ratio (CTR) $> 0.60$ with left ventricular apex down and out.
• Pulmonary Plethora: Increased pulmonary vascular markings extending into the outer third of lung fields; dilated main pulmonary artery segment.
• Left Atrial Enlargement: Double cardiac density, splaying of the carina ($>90^\circ$).

2. Electrocardiogram (12-Lead ECG)

• Biventricular Hypertrophy (Katz-Wachtel Phenomenon): Large equiphasic biphasic QRS complexes ($\ge 50 ext{ mm}$) in mid-precordial leads (V2, V3, V4).
• Left Ventricular Volume Overload: Deep Q waves ($>2 ext{ mm}$) and tall R waves in leads V5 and V6 with upright T waves.
• Right Ventricular Hypertrophy (PAH): Tall R wave in V1 with $R/S ext{ ratio} > 1$, right axis deviation ($+120^\circ$).

3. Transthoracic 2D-Echocardiography with Color Flow Doppler (Gold Standard)

• Defect Localization: Direct visualization of perimembranous defect in parasternal long-axis (PLAX) and short-axis (PSAX) views; measuring defect diameter against aortic valve annulus ($>50\%$ aortic annulus confirms large non-restrictive VSD).
• Shunt Hemodynamics: High-velocity left-to-right flow; low peak systolic Doppler gradient ($<30 ext{ mmHg}$) indicates equalization of RV and LV pressures (severe PAH).
• Pulmonary Artery Systolic Pressure (PASP): Derived from tricuspid regurgitation (TR) jet velocity via modified Bernoulli equation: $$ ext{RVSP} = 4 imes (V_{ ext{TR}})^2 + ext{RAP} $$
• Chamber Dimensions: Dilated left atrium and left ventricle ($Z ext{-score} > +2$); preserved left ventricular ejection fraction ($LVEF \ge 60\%$).

4. Baseline Blood & Metabolic Investigations

• CBC: Mild microcytic hypochromic anemia ($Hb = 10.2 ext{ g/dL}$); total leukocyte count normal ($8,400/\mu ext{L}$).
• Serum Electrolytes: Serum $Na^+ = 136 ext{ mEq/L}$, $K^+ = 4.2 ext{ mEq/L}$, Serum Creatinine $= 0.3 ext{ mg/dL}$ (baseline check prior to ACE inhibitor/diuretic therapy).
• Biomarker: NT-proBNP elevated ($>1500 ext{ pg/mL}$), correlating with the degree of myocardial wall stretch.

Management Plan

1. Medical Stabilization of Heart Failure

• Hospitalization: Admit to pediatric cardiology ward; nurse in semi-fowler propped-up position ($30^\circ$).
• Diuretic Therapy (Preload Reduction):
  • Oral Furosemide: $1 ext{ mg/kg/dose}$ PO twice daily (titrate up to $2 ext{ mg/kg/dose}$ as needed).
  • Oral Spironolactone: $1 ext{ mg/kg/dose}$ PO once daily (potassium-sparing aldosterone antagonist to prevent hypokalemic alkalosis and attenuate myocardial remodeling).
• Afterload Reduction:
  • Oral Enalapril: Start low at $0.1 ext{ mg/kg/day}$ in two divided doses; titrate gradually under blood pressure and serum potassium/creatinine monitoring to $0.3-0.5 ext{ mg/kg/day}$. Reduces systemic vascular resistance, favoring systemic forward output and reducing left-to-right shunt fraction.
• Oxygen Caution: Keep room air or low-flow $O_2$ only if $SpO_2 < 90\%$. Avoid excessive high-concentration $O_2$ because oxygen is a potent pulmonary vasodilator that lowers PVR, dramatically increasing left-to-right shunt and worsening pulmonary edema.

2. Nutritional Rehabilitation in Infant Cardiac Failure

• Target Caloric Intake: High caloric requirement ($120-150 ext{ kcal/kg/day}$) and high protein ($2.5-3 ext{ g/kg/day}$) required to overcome hypermetabolic stress.
• Feeding Strategy:
  • Expressed Breast Milk (EBM) fortified with Medium Chain Triglyceride (MCT) oil (1 mL per 100 mL milk) or commercial milk fortifier to reach $0.8-1.0 ext{ kcal/mL}$.
  • Small, frequent feeds (every 2 to 2.5 hours) to prevent exhaustion.
  • If suck-rest-suck feeding exceeds 30 minutes, switch to orogastric/nasogastric tube feeding to conserve energy expenditure.

3. Definitive Surgical Correction

• Timing of Surgery: Early definitive surgical closure is indicated before 6-9 months of age in infants with large non-restrictive VSD, intractable failure to thrive, and hyperdynamic PAH to prevent irreversible pulmonary vascular remodeling (Plexogenic Pulmonary Arteriopathy / Heath-Edwards Stage III/IV).
• Procedure: Open heart surgery under cardiopulmonary bypass with transatrial patch closure (Dacron or glutaraldehyde-treated autologous pericardial patch) via right atriotomy through the tricuspid valve orifice, meticulously avoiding the postero-inferior border to prevent surgical complete heart block (Bundle of His injury).
• Pulmonary Artery Banding (PAB): Reserved only as a temporizing palliative option if severe intractable sepsis, multiple apical "Swiss-cheese" muscular VSDs, or extreme low birth weight prohibit primary open repair.

4. Preventive Strategies & Long-Term Follow-up

• Infective Endocarditis Prophylaxis: Maintain rigorous dental hygiene. As per AHA/ACC guidelines, antibiotic prophylaxis is indicated for 6 months post-surgical patch repair, or indefinitely if there is a residual shunt adjacent to prosthetic material.
• Immunization Schedule: Complete all routine UIP immunizations; administer annual trivalent inactivated influenza vaccine and pneumococcal conjugate vaccine (PCV13).