Master Rahul, a 4 month old boy, 2nd order child born of a non-consanguineous marriage from Indore, Madhya Pradesh presented with complaints of sudden onset of fast breathing and chest retractions since 5 days, severe feeding difficulty with forehead diaphoresis since 4 days, cold clammy extremities since 1 day, and a preceding history of viral upper respiratory infection 10 days ago.

HOPI

The history is dated back to 10 days ago when the child developed a low-grade fever, runny nose, and dry cough, which lasted for 3 days and resolved with over-the-counter medications.

• Fast Breathing & Respiratory Distress:
  • Began 5 days ago, acute in onset, rapidly progressive.
  • Fast breathing present persistently, even while sleeping.
  • Associated with deep subcostal and intercostal indrawing and grunting respiration Expiratory grunting acts as an autologous PEEP mechanism to prevent alveolar collapse from interstitial pulmonary edema.
• Feeding Fatigue (Cardiogenic Satiety):
  • Started 4 days ago; infant unable to latch for more than 30-45 seconds at a stretch.
  • Sucks weakly, becomes breathless, gasps, and cries in distress (suck-rest-suck pattern).
  • Complete refusal of feeds over the past 24 hours.
  • Associated with profuse cold sweating exclusively over the forehead and hairline during feeding attempts.
• Low Cardiac Output & Perfusion Failure:
  • Since 24 hours, the mother noticed that the child's hands and feet turned cold and pale.
  • Child became progressively lethargic, weak, and drowsy.
  • Marked reduction in urine output: Only 2 lightly wet diapers in the past 24 hours (oliguria $< 1 ext{ mL/kg/hr}$) Reflects low renal perfusion pressure and compensatory renin-angiotensin-aldosterone axis activation.
• Facial Puffiness:
  • Mother noted morning puffiness of eyes and swollen eyelids over the past 2 days In infants, systemic venous congestion manifests predominantly as facial and periorbital edema rather than dependent pedal edema.
• Negative History:
  • No history of central cyanosis at rest or on crying Rules out cyanotic congenital heart disease with ductal closure.
  • No history of heart murmur detected at birth or during routine immunization visits Favors acquired acute myocardial pathology over large congenital left-to-right shunts.
  • No history of seizures, vomiting, altered sensorium, or bulging fontanelle Rules out CNS infection / meningitis.
  • No history of foul-smelling loose stools or severe dehydration.
  • No family history of early infant deaths, metabolic disorders, or maternal gestational diabetes.

Past History

• Born at term (39 weeks) via normal vaginal delivery; birth weight 3.1 kg. Uneventful neonatal period; cried immediately at birth.
• No history of prior hospital admissions, oxygen requirement, or known congenital defects.

Family history

• Parents are non-consanguineous.
• Father 31 years, shop owner; mother 27 years, homemaker.
• Elder sibling (female, 3 years) is healthy and fully vaccinated.
• No family history of cardiomyopathy, sudden unexplained death in young relatives, or deafness.

Immunization history

• Received BCG, OPV-0, Hepatitis B at birth; Pentavalent-1, 2, 3, Rotavirus, and PCV at 6, 10, and 14 weeks.

Dietary history

• Exclusively breastfed since birth. Prior to 5 days ago, feeding was normal with 8-10 feeds/day lasting 15 minutes each.
• In the past 4 days, feeding collapsed due to acute breathlessness.

Food Item	Quantity	Calories (kcal)	Protein (g)
Breast milk	~250 mL effective	168	2.7
Total Observed Intake	—	168 kcal	2.7 g

24-Hour Recall Deficit Analysis

$$ ext{Ideal Body Weight (IBW for 4 months, 50th centile WHO)} = 6.4 ext{ kg} $$

Nutrient	Expected Intake (ICMR-NIN 2024 for IBW 6.4 kg)	Observed Intake	Deficit	Percentage Deficit
Energy (kcal)	$6.4 ext{ kg} imes 100 ext{ kcal/kg} = 640 ext{ kcal}$	168 kcal	472 kcal	73.8% Deficit
Protein (g)	$6.4 ext{ kg} imes 1.1 ext{ g/kg} = 7.04 ext{ g}$	2.70 g	4.34 g	61.6% 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 Class III.
• Pucca house with adequate sanitation. Parents recognized the acute distress and brought the infant directly to the pediatric emergency.

Summary of History

Master Rahul, a 4-month-old male infant born of non-consanguineous marriage, presented with acute onset of severe tachypnea, grunting, suck-rest-suck feeding difficulty, forehead diaphoresis, facial puffiness, oliguria, and cold peripheries over 5 days, following a viral prodromal illness 10 days ago, without central cyanosis or previous heart murmurs.

I would like to think of Acute Congestive Cardiac Failure (CCF) with Low Cardiac Output Syndrome (Cardiogenic Shock), secondary to Acute Viral Myocarditis / Dilated Cardiomyopathy (DCM), in a previously well infant.

General head to toe examination

• Child Behavioral State: Lethargic, irritable on handling, tachypneic with grunting (Prechtl State 4/5 turning to dullness).
• Vitals:
  • Heart Rate: 172 beats/minute (marked tachycardia), regular, thready/low volume in all peripheral pulses; pulses paradoxus absent.
  • Capillary Refill Time (CRT): 4 seconds over the sternum (delayed peripheral perfusion).
  • Respiratory Rate: 68 breaths/minute (severe tachypnea), thoracoabdominal, with deep subcostal, intercostal retractions and expiratory grunting.
  • Blood Pressure: Right upper limb: $70/44 ext{ mmHg}$ ($< 5^{ ext{th}} ext{ centile}$ for age, indicating hypotensive cardiogenic shock; mean arterial pressure $= 52 ext{ mmHg}$).
  • Temperature: $36.4^\circ ext{C}$ (cool extremities).
  • Oxygen Saturation ($SpO_2$): 90% on room air; improves to 96% with $4 ext{ L/min}$ humidified high-flow oxygen.
• Anthropometry:

Parameter	Observed	Expected (50th WHO)	Z-score / Centile	Inference
Weight	5.8 kg	6.4 kg	$-0.8 ext{ SD}$	Normal Weight (Mild acute loss masked by fluid retention)
Length	62 cm	63.8 cm	Normal	Normal Linear Growth
Head Circumference	41.2 cm	41.6 cm	Normal	Normal Head Circumference

• Head to Toe Findings:
  • Periorbital Puffiness: Prominent bilateral eyelid edema.
  • Pallor with mottled, cool extremities extending up to mid-forearms and mid-calves.
  • No central cyanosis, no clubbing.
  • Anterior fontanelle flat, soft.

Systemic Examination

Cardiovascular System

• Inspection:
  • Precordium quiet or mildly hyperdynamic; no visible skeletal deformity.
  • Apical Impulse: Visible in the left $5^{ ext{th}}$ intercostal space, $2 ext{ cm}$ lateral to the midclavicular line (cardiomegaly).
• Palpation:
  • Apical Impulse: Palpable in the left $5^{ ext{th}}$ intercostal space, $2 ext{ cm}$ lateral to the midclavicular line; diffuse, hypodynamic / sluggish in character (marked systolic pump dysfunction).
  • Parasternal heave: Grade 1/3 present along left lower sternal border.
  • Heart sounds not palpable; thrills absent.
• Percussion:
  • Cardiomegaly confirmed; left heart border percussed outside the midclavicular line in the $5^{ ext{th}}$ intercostal space.
• Auscultation:
  • First & Second Heart Sounds ($S_1, S_2$): Soft and muffled heart sounds.
  • Gallop Rhythm ($S_3 / S_4$ Summation Gallop): Prominent triple rhythm / summation gallop audible at the apex and left lower sternal border at $172 ext{ bpm}$ (hallmark of severe decompensated heart failure with elevated LV end-diastolic pressure).
  • Murmur: Soft Grade 2/6 blowing pansystolic murmur heard at the apex radiating to the axilla (functional Mitral Regurgitation secondary to mitral annular dilatation from ventricular cavity enlargement).

Modified Ross Heart Failure Score

Clinical Parameter	Finding in Patient	Ross Score Assigned
Feeding History	Feeds <30 seconds, severe fatigue	2
Respiratory Rate	68 breaths/min ($>60 ext{ bpm}$)	2
Respiratory Pattern	Severe retractions with grunting	2
Heart Rate	172 beats/min ($>150 ext{ bpm}$)	2
Hepatomegaly	Liver 4.0 cm palpable below right costal margin	2
Peripheral Perfusion	CRT 4 seconds, cool clammy extremities	2
Total Modified Ross Score	—	12 / 12 (Critical Heart Failure / Shock)

Score Interpretation: 10–12 = Severe Heart Failure.

other systems

• Respiratory System:
  • Severe tachypnea with grunting.
  • Auscultation: Bilateral harsh vesicular breath sounds with diffuse fine inspiratory crackles (crepitations) heard over all lung fields (acute pulmonary edema).
• Abdomen:
  • Distended abdomen; no dilated veins.
  • Liver: Palpable 4.0 cm below the right costal margin; span 8.5 cm; soft, smooth, rounded margin, acutely tender (acute congestive hepatomegaly).
  • Spleen not palpable; no ascites.
• Central Nervous System: Lethargic, responds to noxious stimuli, normal tone in all four limbs, pupils equal and reactive.

Summary

Master Rahul, a 4-month-old male infant, presented with acute onset of severe tachypnea, grunting, feeding failure, cold clammy extremities, oliguria, and periorbital edema over 5 days, following a viral prodrome 10 days ago.

On examination, the infant is in cardiogenic shock with tachycardia ($172 ext{ bpm}$), hypotension ($70/44 ext{ mmHg}$), CRT of 4 seconds, cool mottled peripheries, diffuse hypodynamic displaced apex, muffled heart sounds with a prominent summation gallop ($S_3$), functional mitral regurgitation murmur, severe congestive hepatomegaly ($4.0 ext{ cm}$), diffuse pulmonary crackles, and a Modified Ross Score of 12/12.

Probable Clinical Diagnosis: Acute Decompensated Congestive Cardiac Failure (Modified Ross Score 12/12) with Cardiogenic Shock and Pulmonary Edema, secondary to Acute Viral Myocarditis / Idiopathic Dilated Cardiomyopathy (DCM), in a previously healthy term infant.

Differential Diagnosis

Disease	Points IN FAVOR	Points AGAINST
Acute Viral Myocarditis / DCM	• Acute onset in previously well infant • Preceding viral prodrome 10 days ago • Tachycardia, gallop rhythm, muffled sounds • Cardiogenic shock + severe CCF (Ross 12/12) • Global LV hypokinesia on examination	Primary Diagnosis
Large VSD with CCF	• Infantile heart failure, tachypnea, hepatomegaly	• Onset is acute at 4 months with shock, not gradual from 6-8 weeks • Murmur is soft functional MR, not loud harsh pansystolic murmur with systolic thrill at LLSB
Anomalous Left Coronary Artery from PA (ALCAPA)	• Presents at 2-4 months with heart failure and DCM • Severe LV systolic dysfunction	• Classically presents with episodic crying during feeds (angina / Bland-White-Garland syndrome) • ECG typically shows anterolateral myocardial infarction ($Q$ waves in I, aVL, V5-V6)
Severe Sepsis / Septic Shock	• Tachycardia, tachypnea, poor perfusion, lethargy	• Marked cardiomegaly, gallop rhythm, and tender hepatomegaly ($4 ext{ cm}$) point definitively to primary cardiogenic pump failure rather than distributive septic shock

Investigation Protocol & Diagnostic Workup

flowchart TD
    A["Infant in CCF & Cardiogenic Shock (Master Rahul)"] --> B["1. Immediate Emergency Bedside Tests"]
    B --> C["ABG & Blood Lactate (Assess Tissue Hypoxia & Acidosis)"]
    B --> D["Point-of-Care Echocardiography (POCUS: LV Function)"]
    B --> E["12-Lead Electrocardiogram (ECG: Arrhythmias & Ischemia)"]
    B --> F["Chest X-Ray (CXR Portable)"]
    
    A --> G["2. Biomarkers & Cardiac Enzymes"]
    G --> H["High-Sensitivity Cardiac Troponin-I / T (Myocardial Necrosis)"]
    G --> I["NT-proBNP / BNP (Myocardial Wall Stress)"]
    
    A --> J["3. Comprehensive 2D Echocardiography"]
    J --> K["Assess LVEDD, LVESD, Fractional Shortening (FS), and LVEF"]
    J --> L["Rule out ALCAPA, CoA, and Congenital Shunts"]
    
    A --> M["4. Etiological Workup"]
    M --> N["Multiplex PCR for Respiratory Viruses (Enterovirus, Adenovirus, Parvovirus B19)"]

1. Arterial Blood Gas (ABG) & Serum Lactate

• Findings: Decompensated metabolic acidosis with respiratory compensation: $$ ext{pH} = 7.22, \quad PaCO_2 = 32 ext{ mmHg}, \quad PaO_2 = 68 ext{ mmHg}, \quad HCO_3^- = 13 ext{ mEq/L}, \quad ext{Base Excess} = -12 ext{ mEq/L} $$
• Serum Lactate: Markedly elevated at $4.8 ext{ mmol/L}$ (tissue hypoperfusion / anaerobic metabolism).

2. Cardiac Biomarkers

• Cardiac Troponin-I (cTnI): Markedly elevated at $1.85 ext{ ng/mL}$ (normal $<0.04 ext{ ng/mL}$), confirming active ongoing acute cardiomyocyte necrosis from viral myocarditis.
• NT-proBNP: $>35,000 ext{ pg/mL}$ (correlates with massive ventricular wall stretch and decompensated failure).

3. 12-Lead Electrocardiogram (ECG)

• Sinus Tachycardia: Rate $174 ext{ bpm}$.
• Low-Voltage QRS Complexes: QRS amplitude $<5 ext{ mm}$ in all limb leads (classic in acute myocarditis due to myocardial edema and inflammatory infiltration).
• T-Wave Changes: Widespread T-wave flattening and inversion in precordial leads (V4–V6).
• Exclude ALCAPA: Absence of deep, wide pathological Q waves ($>4 ext{ mm}$ deep, $>0.04 ext{ s}$) in leads I, aVL, and V5–V6.

4. Chest Radiography (Portable AP View)

• Gross Cardiomegaly: "Water-bottle" globular cardiac silhouette with $CTR = 0.70$.
• Pulmonary Edema: Diffuse perihilar bat-wing haziness, alveolar opacities, and prominent vascular congestion.

5. Transthoracic 2D Echocardiography (Confirmatory)

• Global Left Ventricular Systolic Dysfunction:
  • Markedly dilated left ventricle with spherical remodeling: Left Ventricular End-Diastolic Dimension ($LVEDD = 38 ext{ mm}$, $Z ext{-score} > +3.5$).
  • Severe reduction in contractility: Left Ventricular Ejection Fraction ($LVEF = 22\%$; normal $>55\%$), Fractional Shortening ($FS = 11\%$; normal $28-40\%$).
• Functional Mitral Regurgitation: Central regurgitant jet due to annular dilation ($3-4 ext{ mm}$ vena contracta).
• Pericardial Effusion: Trivial-to-mild rim of pericardial fluid ($3 ext{ mm}$) without tamponade physiology (myopericarditis).
• Coronary Anatomy: Both Left and Right Coronary Arteries visualized arising normally from the aortic root with forward antegrade flow (confirms normal origin and firmly excludes ALCAPA).

Management Plan

1. Emergency Resuscitation & Hemodynamic Stabilization (PICU Protocol)

• Airway & Breathing:
  • Nurse in elevated position ($30-45^\circ$).
  • Provide High-Flow Nasal Cannula (HFNC) or Non-Invasive Positive Pressure Ventilation (CPAP / BiPAP) with PEEP $5-7 ext{ cm H}_2 ext{O}$ to recruit fluid-filled alveoli, decrease work of breathing, and reduce LV afterload.
  • If deteriorating, proceed to elective endotracheal intubation using cardio-stable induction agents (Ketamine $1-2 ext{ mg/kg}$ + Rocuronium; avoid propofol or thiopental).
• Fluid Management:
  • Strict Fluid Restriction: Total fluids restricted to $50-60 ext{ mL/kg/day}$ ($50\%$ maintenance) using $D_{10} 0.2 ext{ NS}$.
  • Insert Foley urinary catheter for hourly urine output monitoring (target $>1 ext{ mL/kg/hr}$).

2. Inotropic & Inodilator Therapy (Targeting Low Cardiac Output)

• Milrinone (Inodilator of Choice):
  • Phosphodiesterase-3 inhibitor: Potent positive inotrope and systemic/pulmonary vasodilator that decreases both preload and afterload without increasing myocardial oxygen consumption.
  • Dose: Continuous infusion at $0.375-0.75 ext{ mcg/kg/min}$ (omit the loading dose to prevent acute hypotension).
• Epinephrine Infusion (for Hypotensive Shock):
  • Low-dose continuous infusion at $0.05-0.1 ext{ mcg/kg/min}$ to restore coronary and systemic perfusion pressure.
• Preload Reduction:
  • IV Furosemide: $1 ext{ mg/kg/dose}$ IV slowly once hemodynamic stability is restored, supplemented by Spironolactone ($1 ext{ mg/kg/day}$).

3. Disease-Specific Immunomodulatory Therapy (for Acute Myocarditis)

• Intravenous Immunoglobulin (IVIG): High-dose IVIG ($2 ext{ g/kg}$ infused over 24-48 hours). Exerts anti-inflammatory, antiviral neutralization, and immunomodulatory effects, documented to improve LVEF recovery in pediatric viral myocarditis.
• Corticosteroids: IV Methylprednisolone ($1-2 ext{ mg/kg/day}$) considered if autoimmune etiology, fulminant disease, or lack of response to IVIG.

4. Transition to Chronic Heart Failure Pharmacotherapy (Post-Stabilization)

Once the acute shock resolves and the infant is euvolemic, initiate guideline-directed medical therapy (GDMT):

• ACE Inhibitor (Oral Enalapril): Start very low ($0.05 ext{ mg/kg/day}$) and titrate under strict BP and renal function monitoring to reduce chronic ventricular remodeling.
• Beta-Blocker (Oral Carvedilol): Start at $0.05 ext{ mg/kg/dose}$ twice daily; double every 2 weeks to target $0.4-0.5 ext{ mg/kg/day}$ to counteract chronic sympathetic toxicity once the patient is completely out of decompensated failure.
• Mechanical Circulatory Support (MCS): If refractory cardiogenic shock occurs despite double inotropes, proceed urgently to Veno-Arterial Extracorporeal Membrane Oxygenation (VA-ECMO) as a bridge to myocardial recovery or Ventricular Assist Device (VAD) / cardiac transplantation.