Note: Ghai's Essential Pediatrics is not directly available in this textbook library. The answer below is compiled from my training knowledge of Ghai's text, cross-referenced and supplemented with Red Book 2021, Tintinalli's Emergency Medicine, and Robbins Pathology.

Neonatal Sepsis - Per Ghai's Essential Pediatrics

Definition

Classification

1. Early-Onset Sepsis (EOS)

• Occurs within the first 72 hours of life (some texts: first 7 days)
• Acquired vertically - from mother during intrapartum period
• Presents as fulminant, multisystem illness
• Associated with obstetric complications

2. Late-Onset Sepsis (LOS)

• Occurs after 72 hours to 28 days of life
• Acquired horizontally - from environment/caregivers (nosocomial) or community
• More indolent course
• Meningitis is more common than in EOS

3. Nosocomial / Hospital-Acquired Sepsis

• More common in NICU settings, premature infants, those on invasive devices

Etiology (Organisms)

Early-Onset Sepsis (in India/developing countries, per Ghai):

Late-Onset Sepsis:

In India, gram-negative organisms (Klebsiella, E. coli, Pseudomonas) dominate compared to western data where GBS is the leading cause. - Red Book 2021

Risk Factors

Maternal / Obstetric Factors:

• Prolonged rupture of membranes (PROM) > 18-24 hours
• Maternal fever / chorioamnionitis
• Foul-smelling liquor
• GBS colonization (positive vaginal swab)
• Preterm delivery (<37 weeks)
• Urinary tract infection in mother
• Multiple per vaginal examinations during labor
• Unhygienic deliveries

Neonatal Factors:

• Prematurity (most important risk factor for LOS)
• Low birth weight / very low birth weight
• Male sex
• Galactosemia (predisposes to E. coli sepsis)
• Lack of breastfeeding
• Invasive procedures (intubation, umbilical catheterization)
• Skin/mucosal breaches

Pathogenesis

1. Organism colonizes the neonate (birth canal, environment, skin)
2. Breach of normal barriers (skin, mucous membranes)
3. Bacteremia → systemic inflammatory response
4. Release of cytokines (TNF-α, IL-1, IL-6) → SIRS
5. Endothelial damage → DIC, multi-organ failure
6. Blood-brain barrier breach → meningitis (more common in LOS)

Clinical Features

Temperature Instability:

• Fever (rectal temp ≥38°C) - in term infants
• Hypothermia (rectal temp <36.5°C) - more common in preterm and sick neonates; a very ominous sign

CNS Signs:

• Lethargy, hypotonia ("floppy baby")
• Irritability, high-pitched cry
• Poor feeding
• Seizures (especially in meningitis)
• Bulging anterior fontanelle (meningitis)

Respiratory Signs:

• Apnea (most alarming - may be the only sign in preterm)
• Tachypnea (RR >60/min)
• Grunting, retractions

Cardiovascular Signs:

• Tachycardia or bradycardia
• Poor peripheral perfusion, mottling
• Prolonged capillary refill time (>3 sec)
• Hypotension (septic shock)

GI Signs:

• Poor feeding, feed intolerance
• Abdominal distension
• Vomiting, diarrhea
• Hepatomegaly

Other Signs:

• Jaundice (unexplained, especially direct hyperbilirubinemia)
• Skin: petechiae, purpura (DIC), sclerema neonatorum
• Pallor, cyanosis

"Neonates have about twice the risk of serious bacterial infection as do infants 4-8 weeks of age." - Tintinalli's Emergency Medicine

Investigations

Definitive (Gold Standard):

• Blood culture - Gold standard; must be done BEFORE starting antibiotics; minimum 1 mL blood; 2 samples from different sites preferred
• CSF culture (lumbar puncture) - mandatory in all suspected sepsis (meningitis in up to 20-25% of neonates with sepsis; neck stiffness often absent)
• Urine culture - catheter specimen; especially for LOS

Supportive / Screening:

Ghai's Sepsis Screen (Positive if ≥2 of the following):

1. TLC <5,000/mm³
2. Absolute neutrophil count (ANC) <1,800/mm³
3. Immature:Total neutrophil ratio (I:T ratio) >0.2
4. Micro-ESR >15 mm/1st hour
5. CRP >1 mg/dL

A positive sepsis screen has ~90% sensitivity but lower specificity. Blood culture remains the gold standard.

Management

Supportive Care:

• Thermoregulation (maintain neutral thermal environment)
• IV access; correct hypoglycemia, electrolyte imbalances
• Oxygen supplementation, CPAP or ventilation if needed
• IV fluids for shock; inotropes (dopamine, dobutamine) if hypotension persists
• Correct coagulopathy (FFP, platelets) if DIC
• Phototherapy for jaundice

Antibiotic Therapy:

• Ampicillin + Gentamicin (first-line for community-acquired / EOS)
  • Ampicillin: 50 mg/kg/dose IV q12h (q8h for meningitis)
  • Gentamicin: 5 mg/kg/dose IV once daily

• Replace gentamicin with Cefotaxime (50 mg/kg/dose q8-12h) for better CNS penetration
• Avoid ceftriaxone in neonates - displaces bilirubin from albumin → kernicterus risk

• Vancomycin ± Amikacin or Piperacillin-tazobactam

• Add IV Acyclovir (20 mg/kg/dose q8h)

• Uncomplicated bacteremia: 10-14 days
• Meningitis (GBS): 14-21 days; gram-negative meningitis: 21 days
• Negative cultures + good response: 5-7 days (or stop)

Early-Onset GBS Sepsis - Risk Assessment (AAP/Red Book)

• Red Book 2021, p. 1101

Complications

• Meningitis → hydrocephalus, neurodevelopmental delay, hearing loss
• Septic shock → multi-organ dysfunction
• DIC → hemorrhage
• Periventricular leukomalacia (in preterm)
• Necrotizing enterocolitis (NEC)
• Subdural empyema, brain abscess
• Death (mortality 10-50% in developing countries; higher with gram-negative sepsis)

Prevention

• Antenatal: screen and treat maternal infections, GBS prophylaxis (IAP - Intrapartum Antibiotic Prophylaxis with Penicillin G)
• Clean delivery practices (especially at home deliveries)
• Hand hygiene in NICUs
• Strict aseptic technique for all invasive procedures
• Exclusive breastfeeding (provides IgA, lactoferrin, lysozyme)
• Rooming-in to reduce nosocomial exposure
• Umbilical cord care (clean, dry cord care; topical chlorhexidine in LMICs)

Key Points for Exams (Ghai Perspective)