Respiratory Distress in Newborn (Neonatal Respiratory Distress)
Definition
Respiratory distress in a newborn refers to difficulty in breathing occurring within the neonatal period (first 28 days of life). It is characterized by tachypnea and increased work of breathing due to inadequate oxygenation or ventilation.
Clinically, respiratory distress is suspected when a newborn shows two or more characteristic signs of increased respiratory effort.
1. Pathophysiology
Respiratory distress results from impaired gas exchange in the lungs, leading to hypoxemia, hypercapnia, and metabolic acidosis.
Mechanisms include:
- Surfactant deficiency
* Leads to alveolar collapse (atelectasis)
* Reduced lung compliance
* Seen in preterm infants.
- Delayed lung fluid clearance
* Retained fetal lung fluid → decreased air entry.
- Inflammation or infection
* Leads to alveolar damage and impaired oxygen diffusion.
- Airway obstruction
* Meconium, mucus, congenital airway anomalies.
- Persistent pulmonary hypertension
* Right-to-left shunting through ductus arteriosus or foramen ovale.
2. Causes of Respiratory Distress in Newborn
Pulmonary Causes
- Respiratory Distress Syndrome (RDS)
- Transient Tachypnea of Newborn (TTN)
- Meconium Aspiration Syndrome
- Pneumonia
- Pneumothorax
- Pulmonary hemorrhage
- Congenital diaphragmatic hernia
- Pulmonary hypoplasia
Cardiac Causes
- Congenital heart disease
- Persistent pulmonary hypertension of newborn (PPHN)
Infectious Causes
- Neonatal sepsis
- Congenital infections
Metabolic Causes
- Hypoglycemia
- Metabolic acidosis
Hematologic Causes
- Severe anemia
- Polycythemia
Neurologic Causes
- Birth asphyxia
- Intracranial hemorrhage
3. Risk Factors
- Prematurity
- Maternal diabetes
- Cesarean delivery without labor
- Perinatal asphyxia
- Meconium-stained amniotic fluid
- Prolonged rupture of membranes
- Maternal infection
4. Clinical Features
Major Signs
- Tachypnea
* Respiratory rate >60 breaths/min
- Grunting
* Expiratory sound produced to maintain airway pressure.
- Nasal flaring
* Attempt to increase oxygen intake.
- Chest retractions
* Subcostal
* Intercostal
* Suprasternal
- Cyanosis
* Central cyanosis indicates severe hypoxia.
Additional Signs
- Apnea
- Poor feeding
- Lethargy
- Hypotonia
5. Assessment of Severity
Silverman–Anderson Score
Parameters assessed:
- Chest movement
- Intercostal retractions
- Xiphoid retractions
- Nasal flaring
- Expiratory grunt
Score interpretation:
| Score | Severity |
| ----- | ----------------- |
| 0–3 | Mild distress |
| 4–6 | Moderate distress |
| 7–10 | Severe distress |
6. Investigations
1. Pulse Oximetry
- Measures oxygen saturation.
2. Arterial Blood Gas (ABG)
Findings:
- Hypoxemia
- Hypercapnia
- Metabolic acidosis
3. Chest X-Ray
Helps identify cause:
Examples:
- Ground glass appearance → RDS
- Hyperinflation → TTN
- Patchy infiltrates → pneumonia or meconium aspiration
- Air leak → pneumothorax
4. Laboratory Tests
- CBC
- CRP
- Blood culture
- Blood glucose
- Electrolytes
5. Echocardiography
- If congenital heart disease suspected.
7. Differential Diagnosis
Conditions presenting similarly:
- Respiratory Distress Syndrome
- Transient Tachypnea of Newborn
- Meconium Aspiration Syndrome
- Neonatal pneumonia
- Congenital heart disease
- Pneumothorax
- Persistent pulmonary hypertension
8. Management
Management depends on severity and underlying cause.
Stepwise Management
Step 1: Initial Stabilization
- Maintain airway
- Provide warmth
- Position baby (sniffing position)
- Clear secretions if needed
- Monitor vital signs
Step 2: Oxygen Therapy
Indications:
- SpO₂ < 90–92%
Methods:
- Oxygen hood
- Nasal cannula
- Continuous Positive Airway Pressure (CPAP)
Target oxygen saturation:
- 90–95%
Step 3: CPAP (Continuous Positive Airway Pressure)
Indications:
- Moderate respiratory distress
- RDS
- Oxygen requirement >40%
Benefits:
- Prevents alveolar collapse
- Improves oxygenation.
Step 4: Mechanical Ventilation
Indications:
- Severe respiratory distress
- Apnea
- Respiratory failure
- Persistent hypoxemia despite CPAP
Step 5: Treat Underlying Cause
Examples:
| Cause | Treatment |
| ------------ | ------------------ |
| RDS | Surfactant therapy |
| TTN | Supportive care |
| Pneumonia | Antibiotics |
| Pneumothorax | Needle aspiration |
| PPHN | Nitric oxide |
9. Drug Therapy
Surfactant Therapy
Indication
- Neonatal Respiratory Distress Syndrome (especially in preterm infants).
Mechanism of Action
Surfactant reduces alveolar surface tension, preventing alveolar collapse during expiration and improving lung compliance.
Common Preparations
- Beractant
- Poractant alfa
Usual Dosing
- Beractant: 100 mg/kg intratracheally
- Poractant alfa: 100–200 mg/kg intratracheally
Pharmacokinetics
- Acts locally in lungs
- Rapid improvement in oxygenation.
Adverse Effects
Common:
- Transient bradycardia
- Oxygen desaturation
Serious:
- Pulmonary hemorrhage
- Air leak syndrome
Contraindications
- Severe congenital anomalies incompatible with life.
Monitoring
- Oxygen saturation
- Blood gases
- Ventilator settings.
Counseling Points
- Early treatment improves survival.
- Used mainly in preterm babies.
Antibiotics (if infection suspected)
Common Regimen
Ampicillin
Indication
- Neonatal sepsis and pneumonia.
Mechanism
- Inhibits bacterial cell wall synthesis.
Dose
- 50 mg/kg IV every 12 hours (neonates).
Adverse Effects
- Rash
- Diarrhea
- Allergic reactions
Gentamicin
Mechanism
- Inhibits bacterial protein synthesis.
Dose
- 4–5 mg/kg IV once daily.
Adverse Effects
- Nephrotoxicity
- Ototoxicity
Monitoring
- Renal function
- Drug levels if prolonged therapy.
10. Non-Pharmacological Measures
- Maintain neutral thermal environment
- Adequate nutrition
- IV fluids
- Minimal handling
- Infection control
- Monitor glucose and electrolytes.
11. Complications
If untreated or severe:
- Respiratory failure
- Pneumothorax
- Bronchopulmonary dysplasia
- Hypoxic brain injury
- Death
12. Prevention
- Antenatal corticosteroids in preterm labor
- Good antenatal care
- Prevention of prematurity
- Skilled neonatal resuscitation
- Early breastfeeding
- Infection prevention
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