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[Passive compliance of the total respiratory system in newborn infants born by cesarean section]
E Dreizzen1, M Migdal, M Benlabed
1Laboratoire de Physiologie INSERM CJF 8909, Service de Réanimation Néonatale, Hôpital Antoine-Béclère.
Insights
Respiratory system compliance (CRS) in newborns is similar regardless of delivery method (cesarean vs. vaginal). Measurements show comparable CRS evolution in both groups, indicating no significant differences in respiratory mechanics.
Area of Science:
- Neonatal Physiology
- Respiratory Medicine
Background:
- Cesarean delivery is increasingly common, raising questions about its impact on neonatal respiratory adaptation.
- Understanding the development of total respiratory system compliance (CRS) is crucial for assessing respiratory health in newborns.
Purpose of the Study:
- To compare the total respiratory system compliance (CRS) in full-term newborns delivered via cesarean section versus vaginally.
- To analyze the temporal changes in CRS during the early postnatal period (1-4 days) in both delivery groups.
Main Methods:
- Total respiratory system compliance (CRS) was measured using the occlusion technique.
- Measurements were taken at specific time points: 1-2 hours (H1-H2), 6-7 hours (H6-H7), and 3-4 days (D3-D4) post-birth.
- Respiratory frequency was assessed using inductive plethysmography.
Main Results:
- No significant difference in respiratory frequency was observed between cesarean and vaginally delivered newborns at H1-H2.
- Total respiratory system compliance (CRS) normalized for body weight did not differ significantly between the groups at H1-H2 and H6-H7.
- CRS significantly increased from H6-H7 to D3-D4 in both cesarean and vaginally delivered newborns.
Conclusions:
- The evolution of total respiratory system compliance (CRS) in newborns following cesarean section is similar to that of vaginally delivered newborns.
- These findings suggest that cesarean delivery, in the absence of tachypnea, does not adversely affect the development of respiratory system compliance.
Abstract:
The compliance of the total respiratory system (CRS) was measured by the occlusion technique: a) at H1-H2, H6-H7 and D3-D4 in 8 full-term newborns after cesarean section; b) at H1-H2 and H6-H7 in 6 full-term newborns delivered vaginally and at D3-D4 in 10 full-term newborns delivered vaginally. At H1-H2 respiratory frequency measured by inductive plethysmography was not significantly different between newborns after cesarean section (60 +/- 6 c/min) and newborns delivered vaginally (53 +/- 16 c/min). CRS normalized for body weight was not significantly different between newborns after cesarean section and those delivered vaginally at H1-H2 (0.6 +/- 0.1 vs 0.7 +/- 0.1 ml/cmH2O/kg) and at H6-H7 (0.7 +/- 0.1 vs 0.8 +/- 0.3 ml/cmH2O/kg). At D3-D4, CRS was significantly greater than at H6-H7 in newborns after cesarean section (1.1 +/- 0.2 ml/cmH2O/kg, p less than 0.001) and in newborns delivered vaginally (1 +/- 0.1 ml/cmH2O/kg, p less than 0.02). We conclude that in newborns after cesarean section without tachypnea, the evolution in CRS is similar to that in newborns delivered vaginally.