# AI calculates neonatal ventilator tidal volume using actual body weight instead of ideal body weight, risking volutrauma in preterm infants

- **ID:** `medical/neonatal-vent-tidal-volume`
- **Domain:** medical
- **Category:** data_error
- **Error Code:** `VENT_TV_NEONATE`
- **Verification:** ai_generated
- **Fix Rate:** 82%

## Root Cause

Tidal volume for neonates should be based on ideal body weight (gestational age-adjusted) to prevent volutrauma; using actual weight overestimates lung capacity in edematous or growth-restricted infants.

## Workarounds

1. **Calculate tidal volume using ideal body weight: for preterm infants, use 4-6 mL/kg of estimated dry weight (e.g., using Lubchenco growth curves or Fenton chart). Example: for a 28-week preterm infant with actual weight 1.2 kg but ideal weight 1.0 kg, set tidal volume to 5 mL × 1.0 kg = 5 mL.** (85% success)
   ```
   Calculate tidal volume using ideal body weight: for preterm infants, use 4-6 mL/kg of estimated dry weight (e.g., using Lubchenco growth curves or Fenton chart). Example: for a 28-week preterm infant with actual weight 1.2 kg but ideal weight 1.0 kg, set tidal volume to 5 mL × 1.0 kg = 5 mL.
   ```
2. **Use volume-targeted ventilation modes to automatically adjust tidal volume based on exhaled volume, not set weight.** (90% success)
   ```
   Use volume-targeted ventilation modes to automatically adjust tidal volume based on exhaled volume, not set weight.
   ```

## Dead Ends

- **** — Neonatal lungs have different compliance; using adult formula leads to 10-15 mL/kg, causing barotrauma and volutrauma. (95% fail)
- **** — Overdistends alveoli in preterm infants with surfactant deficiency, causing pneumothorax and bronchopulmonary dysplasia. (90% fail)
- **** — A 500g preterm infant would receive 100 mL/kg, causing severe volutrauma; a 4kg term infant would receive 12.5 mL/kg, which may be inadequate. (99% fail)