A term neonate (4 kg) was born

A term neonate (4 kg) was born with thick meconium following a prolonged and arduous labor. Apgar scores were 1 at 1 minute and 4 at 5 minutes of life. The neonate required full resuscitation measures at birth, was intubated and mechanically ventilated by t-piece resuscitator in the delivery suite, and transferred to the neonatal intensive care unit. He was ventilated in the SIMV mode on the following settings: PIP 26 cm H2O, PEEP 5 cm H2O, I-time 0.4 second, a respiratory rate of 45 breaths per minute, and FiO2 0.80. The arterial blood gas revealed the following: pH 7.09, CO2 74 mm Hg, PaO2 35 mm Hg, bicarbonate 16 mEq/L, and base excess 8. The PIP was increased to 30 cm H2O, and 5 minutes after the increase to the PIP, the following was observed: SpO2 90% to 95%. The measured MAP on the ventilator was 16 cm H2O, and tidal volume was 12 mL (3 mL/kg). The mode of ventilation was switched to HFOV. The initial oscillator settings were MAP 18 cm H2O, amplitude 38, frequency 10 Hz, and FiO2 0.75. This continued for 8 hours, during which time the clinical condition and blood gases started to improve. The chest radiograph showed good lung expansion. The amplitude was reduced as chest wiggle was pronounced and CO2 started to decrease. Oxygenation also started to improve, so FiO2 was reduced to 0.40 on day 2. Over the next 48 hours, the MAP was slowly reduced by increments of 1 to 2 cm H2O until a MAP of 14 cm H2O. The oxygen requirement was only 35%. On day 6 of life, the neonate was to be extubated to nasal CPAP at 4 cm H2O and an FiO2 of 0.28. 1. What was the rationale for transitioning from conventional ventilation to HFOV? 2. How do you approach setting the mean airway pressure when transitioning from conventional ventilation to HFOV? 3. What ventilator parameters are used to increase or decrease CO2 on the HFOV? 4. What is an important aspect of setting the amplitude when transitioning to HFOV?

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