A preterm infant (32 weeks gestation) is born to a mother with prolonged rupture of membranes. At 1 minute, the infant is apneic, has a heart rate of 65 bpm, is pale and limp with no response to stimulation. The delivery room team has initiated positive pressure ventilation with 21% oxygen for 30 seconds. What is the most appropriate next step?

Explanation

## Clinical Assessment The 1-minute APGAR score is: - Heart rate 65 bpm = 0 points - Pale, no response = 0 points (no grimace) - Limp = 0 points - Apneic = 0 points **Total APGAR = 0 (severely depressed)** ## Preterm Infant Resuscitation Strategy ```mermaid flowchart TD A["Preterm infant<br/>Severely depressed"]:::outcome --> B["Initial steps:<br/>Dry, warm, position"]:::action B --> C["PPV with 21% O₂<br/>for 15 seconds"]:::action C --> D{"HR improved?<br/>HR ≥ 100?"}:::decision D -->|"No"| E["Increase FiO₂ to 40%<br/>Check PPV technique"]:::action D -->|"Yes"| F["Continue PPV<br/>Wean O₂ as tolerated"]:::action E --> G{"HR ≥ 100 after<br/>another 15 sec?"}:::decision G -->|"No"| H["Initiate chest compressions<br/>3:1 compression:ventilation"]:::action G -->|"Yes"| F H --> I["Establish IV/IO access<br/>Consider medications"]:::action ``` ## Key Point: **Preterm infants < 35 weeks may benefit from initial FiO₂ of 21–30% to reduce oxidative stress, but escalate to 40% if no response to PPV within 15 seconds.** This infant: - Is severely depressed (APGAR 0) - Has been on PPV with 21% O₂ for 30 seconds (2 cycles of 15-second reassessment) - Heart rate remains 65 bpm (< 100) - **Requires escalation to 40% FiO₂ and preparation for chest compressions** ## High-Yield: **Oxygen titration in preterm resuscitation:** - Start with 21% O₂ for infants < 35 weeks (reduce hyperoxia risk) - If HR < 100 after 15 seconds, increase to 40% - If HR < 60 despite adequate PPV + 40% O₂ for 15 seconds, initiate chest compressions (3:1 ratio) - Chest compressions are indicated when HR < 60 bpm, NOT when HR is 60–100 with ongoing PPV ## Clinical Pearl: **The 60 bpm threshold:** A heart rate of 60 bpm in a severely depressed newborn is the critical decision point. If HR remains < 60 after 15 seconds of adequate PPV with increased oxygen, chest compressions must begin. A HR of 65 bpm is just above this threshold but still inadequate; escalating oxygen and reassessing is the correct next step. ## Warning: **Do NOT initiate chest compressions immediately.** Chest compressions are only indicated if HR remains < 60 bpm despite adequate PPV and escalated FiO₂. Premature chest compressions can cause rib fractures and other trauma in a preterm infant. ## Mnemonic: **"60 for compressions"** — If HR < 60 after adequate PPV + oxygen escalation, begin chest compressions at 3:1 ratio (3 compressions : 1 ventilation). [cite:NRP 8th Edition; Cloherty Neonatal Handbook Ch 4]