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Published on: August 15, 2018
The first five inflations during resuscitation of prematurely born infants
Vadivelam Murthy1, Nikesh Dattani, Janet L Peacock
1Division of Asthma, Allergy and Lung Biology, MRC & Asthma UK Centre in Allergic, Mechanisms of Asthma, King's College London, UK.
Insights
Infant inspiratory efforts during neonatal resuscitation significantly increase expired tidal volume. This study highlights the importance of active patient participation in improving ventilation effectiveness in premature infants.
Area of Science:
- Neonatal Medicine
- Pediatric Resuscitation
- Respiratory Physiology
Background:
- Neonatal resuscitation aims to establish effective breathing in newborns.
- Premature infants often require respiratory support, including positive pressure inflations.
- The role of infant inspiratory effort during initial inflations is not fully understood.
Purpose of the Study:
- To analyze the first five inflations during neonatal resuscitation in premature infants.
- To determine if infant inspiratory efforts influence expired tidal volume during resuscitation.
Main Methods:
- Prospective observational study conducted in two tertiary perinatal centers.
- Respiratory function monitoring was used to analyze the first five mask inflations in 30 premature infants (median gestational age 30 weeks).
- Expired tidal volume, inflation pressures, and mask leak were compared between active (infant inspiratory effort) and passive inflations.
Main Results:
- Expired tidal volume was significantly greater during active inflations (median 5.6 ml/kg) compared to passive inflations (median 2.1 ml/kg).
- Face mask leak was lower during active inflations (34.5%) compared to passive inflations (60.7%).
- Expired tidal volume positively correlated with inflation pressures and negatively with mask leaks.
Conclusions:
- Expired tidal volumes, pressures, and inflation times during initial resuscitation inflations are variable.
- Infant inspiratory effort during resuscitation inflations significantly increases expired tidal volume.
- Optimizing ventilation in premature infants may involve facilitating active infant participation.
Objective:
To study the first five inflations during the resuscitation of prematurely born infants and whether the infant's inspiratory efforts influenced the expired tidal volume.
Design:
Prospective observational study.
Setting:
Two tertiary perinatal centres.
Patients:
Thirty infants, median gestational age 30 (23-34) weeks.
Interventions:
The first five inflations delivered via a face mask and t-piece device were examined using respiratory function monitoring.
Main Outcome Measures:
Inflation pressures, inflation times and expiratory volumes were recorded and comparison made of inflations during which the infant made an inspiratory effort (active inflation) or did not (passive inflation).
Results:
Overall, the median expired tidal volume was 2.5 (0-19.8) ml/kg and was lower for passive (median 2.1 ml/kg, range 0-19.8 ml/kg) compared with active (median 5.6 ml/kg, range 1.2-12.2 ml/kg) inflations (ratio of geometric means 1.85, 95% CI 1.18 to 28%) (p=0.007). Overall, the median face mask leak was 54.5% and was lower for active (34.5%) compared with passive (60.7%) inflations (mean difference in % leak: 12.4%, 95% CI 0.9 to 24%) (p=0.0354). There was a significant positive correlation between the expiratory volumes and the inflation pressures (R2 between subjects 0.19, p=0.04) and a negative correlation between the expiratory tidal volumes and the face mask leaks (R2 between subjects=0.051, p<0.001), but there was no significant correlation between the inflation times and the expiratory tidal volumes.
Conclusion:
The expired tidal volume, inflation pressures and times during the first five inflations during resuscitation were variable. The expired tidal volumes were significantly greater if the infant inspired during the inflation.
