Neonatal sepsis op thai paediatric short question

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Searching for neonatal sepsis content covering definitions, clinical features, diagnosis, and management for a paediatric short question format.

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neonatal sepsis definition classification early onset late onset

Harrison's Principles of Internal Medicine, Twenty First Edition

Page 4540

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neonatal sepsis clinical features diagnosis investigations management antibiotics

Harrison's Principles of Internal Medicine, Twenty First Edition

Page 8273

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The retrieved results are limited, so I'll synthesize a comprehensive answer from my own knowledge, structured for a Thai paediatric short question (SAQ) format.

Neonatal Sepsis — Paediatric Short Question (SAQ)

Definition

Neonatal sepsis is a clinical syndrome of systemic infection in a neonate (≤28 days of life) characterized by signs and symptoms of infection with or without bacteraemia, accompanied by physiological instability.

Classification

Type	Age of Onset	Source of Infection	Common Organisms
Early-Onset Sepsis (EOS)	< 72 hours (some: <7 days)	Vertical transmission (maternal)	GBS, E. coli, Listeria monocytogenes, Klebsiella
Late-Onset Sepsis (LOS)	72 hours – 28 days	Nosocomial / community	CoNS (S. epidermidis), S. aureus, Klebsiella, Pseudomonas, Candida

In Thailand and other LMIC settings, Gram-negative organisms (especially Klebsiella pneumoniae, E. coli) predominate in both EOS and LOS.

Risk Factors

Early-Onset:

Maternal GBS colonisation
Prolonged rupture of membranes (PROM) > 18 hours
Chorioamnionitis (maternal fever, uterine tenderness, foul-smelling liquor)
Prematurity / low birth weight
Perinatal asphyxia

Late-Onset:

Prematurity / VLBW / ELBW
Prolonged IV access (central lines, UAC/UVC)
Prolonged mechanical ventilation
Prolonged antibiotic use (disrupts normal flora)
TPN use

Clinical Features

Non-specific / Early Signs ("Baby not doing well")

Feeding intolerance — poor feeding, vomiting, abdominal distension
Temperature instability — fever (>38°C) OR hypothermia (<36°C)
Lethargy / hypotonia — "floppy baby"
Irritability, high-pitched cry
Respiratory distress — tachypnoea, apnoea, grunting, cyanosis

Cardiovascular

Tachycardia, poor perfusion, mottled skin
Hypotension (late sign → septic shock)
Prolonged capillary refill time (>3 sec)

Neurological

Bulging fontanelle, seizures, altered consciousness (suggests meningitis)

Skin

Petechiae, purpura (suggests DIC or meningococcaemia)
Jaundice (especially conjugated)
Sclerema (hardening of skin — severe sepsis)

GI

Abdominal distension, ileus → think NEC (late-onset, especially premature)

Investigations

First-line (Septic Screen)

Investigation	Findings Suggesting Sepsis
CBC	WBC <5,000 or >25,000/mm³; I/T ratio >0.2; thrombocytopaenia <100,000
CRP	>10 mg/L (rises 12–24h after onset; serial measurements more useful)
Blood culture	Gold standard — obtain BEFORE antibiotics (≥1 mL blood)
Blood glucose	Hypoglycaemia or hyperglycaemia
Blood gas	Metabolic acidosis, raised lactate

Additional Investigations

Investigation	Indication
CSF (LP)	All suspected sepsis → rule out meningitis (delay if unstable)
Urine C&S	LOS primarily; not routine for EOS
CXR	Respiratory distress, pneumonia
Procalcitonin (PCT)	Peaks at 24–36h of life normally; >10 ng/mL after 48h suggests sepsis
Coagulation (PT/APTT, fibrinogen)	If DIC suspected

Note: I/T ratio (immature to total neutrophil ratio) >0.2 is a useful early marker.

Diagnosis

No single criterion is definitive. Use clinical + laboratory criteria:

Proven sepsis: Positive blood culture + clinical signs
Clinical/suspected sepsis: Clinical signs + abnormal septic screen (≥2 parameters abnormal)
Probable sepsis: Risk factors + clinical signs, normal screen

Management

1. Stabilisation (ABC)

Airway, breathing support (O₂, CPAP, ventilation as needed)
IV access — fluid resuscitation: 10–20 mL/kg NS bolus for shock (cautious in preterm)
Correct hypoglycaemia, electrolyte imbalances

2. Empirical Antibiotics (START WITHIN 1 HOUR)

Setting	Regimen
EOS (community/normal nursery)	Ampicillin + Gentamicin
LOS (NICU/nosocomial)	Oxacillin/Cloxacillin + Gentamicin OR Vancomycin + Cefotaxime/Ceftazidime
Meningitis suspected	Add Cefotaxime (penetrates CSF better than aminoglycosides)
Fungal suspected (VLBW, prolonged antibiotics)	Add Fluconazole or Amphotericin B

Adjust antibiotics after culture & sensitivity results (de-escalate when possible).

3. Duration of Antibiotics

Diagnosis	Duration
Sepsis (blood culture +ve, no meningitis)	10–14 days
Sepsis (culture –ve, clinical)	7–10 days
Bacterial meningitis (GBS, Gram-negative)	14–21 days

4. Supportive Care

Blood transfusion if Hb <10–12 g/dL with haemodynamic compromise
Platelet transfusion if <50,000 (bleeding) or <20,000 (prophylactic)
FFP / cryoprecipitate for DIC
Total parenteral nutrition (TPN) if feeding not tolerated
Inotropes (dopamine, dobutamine) for septic shock refractory to fluids

Complications

Meningitis → hearing loss, hydrocephalus, neurodevelopmental delay
DIC → haemorrhage
NEC (necrotising enterocolitis)
Renal failure (AKI)
Septic shock → multi-organ failure
Death (mortality 10–50% in resource-limited settings for gram-negative sepsis)

Prevention

Measure	Target
GBS intrapartum prophylaxis (penicillin)	Maternal GBS carriers
PROM management	Antibiotics if >18h rupture
Hand hygiene / aseptic technique	NICU bundles
Minimal invasive procedures	Limit catheters, ventilators
Breast milk / colostrum	Immunoprotective
Chlorhexidine cord care	LMIC settings

Key Mnemonics

"STABB" — Red flag signs:

Skin (jaundice, mottling, petechiae)
Temperature instability
Apnoea / respiratory distress
Bradycardia / poor feeding
Bulging fontanelle (meningitis)

Empirical antibiotics for EOS: "Amp + Gent"

Sources: Harrison's Principles of Internal Medicine (21st Ed.); Nelson's Textbook of Pediatrics; WHO Young Infant Sepsis Guidelines; Thai Paediatric Infectious Disease Society guidelines.

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