Neonatal sepsis op thai paediatric short question
Reading Document
Medical Text Search
neonatal sepsis definition classification early onset late onset
Medical Text Search
neonatal sepsis clinical features diagnosis investigations management antibiotics
GradeResponse
GradeResponse
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.
This is a shared conversation. Sign in to Orris to start your own chat.