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Establishment of functional residual capacity at birth: Observational study of 821 neonatal resuscitations.

Abstract：

AIM OF THE STUDY:Establishing functional residual capacity (FRC) during positive pressure ventilation (PPV) of apnoeic neonates is critical for survival. This may be difficult due to liquid-filled airways contributing to low lung compliance. The objectives were to describe initial PPV, changes in lung compliance and establishment of FRC in near-term/term neonates ≥36 weeks gestation at birth. METHODS:Observational study of all neonatal resuscitations between 01.07.13 and 30.06.18 in a Tanzanian referral hospital. Perinatal events and characteristics were observed and recorded by trained research assistants. PPV were performed using self-inflating bag-masks without positive end-expiratory pressure (PEEP). Ventilation signals (pressure/flow), expired CO2 (ECO2) and heart rate were recorded by resuscitation monitors. RESULTS:19,587 neonates were born, 1451 received PPV, of these 821 of median (p25, p75) birthweight 3180 (2844, 3500) grams and gestation 38 (37, 40) weeks had ≥20 ventilations and complete datasets. There was a significant increase in expired volume (from 3.3 to 6.0 ml/kg), ECO2 (0.3-2.4%), lung compliance (0.13-0.19 ml/kg/mbar) and heart rate (109-138 beats/min) over the first 20 PPVs. Inflation volume, time, and peak inflation pressure (PIP) were stable around 12-13 ml/kg, 0.45 s, and 36 mbar, respectively. CONCLUSIONS:The combination of increasing expired volumes, ECO2, and heart rate with decreasing inflation/expired volume ratios and constant PIP, suggests establishment of FRC during the first 20 PPVs in near-term/term neonates using a self-inflating bag-mask without PEEP, the most common device worldwide for ventilating non-breathing neonates. Initial lung compliance is low, and with short inflation times, higher than recommended PIP seem necessary to deliver adequate tidal volumes.

journal_name

Resuscitation

journal_title

Resuscitation

authors

Ersdal HL,Eilevstjonn J,Perlman J,Gomo Ø,Moshiro R,Mdoe P,Kidanto H,Hooper SB,Linde JE

doi

10.1016/j.resuscitation.2020.05.033

subject

Has Abstract

pub_date

2020-08-01 00:00:00

pages

71-78

eissn

0300-9572

issn

1873-1570

pii

S0300-9572(20)30213-6

journal_volume

153

pub_type

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