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Haemodynamic features during high-frequency oscillatory ventilation in preterms
G Cambonie1, S Guillaumont, F Luc
1Neonatal Intensive Care Unit, Hôpital Arnaud de Villeneuve, University Hospital of Montpellier, France. g-cambonie@chu-montpellier.fr
Acta Paediatrica (Oslo, Norway : 1992)
|November 6, 2003
Summary
High-frequency oscillatory ventilation (HFOV) did not alter cardiac function in preterm infants with respiratory distress syndrome compared to conventional mechanical ventilation (CMV). However, HFOV showed impaired left ventricular performance with persistent ductal shunts.
Area of Science:
- Neonatal Medicine
- Pediatric Cardiology
- Respiratory Physiology
Background:
- Respiratory distress syndrome (RDS) is common in very preterm infants.
- Mechanical ventilation is crucial for managing RDS but can impact hemodynamics.
- High-frequency oscillatory ventilation (HFOV) and conventional mechanical ventilation (CMV) are used, with different physiological effects.
Purpose of the Study:
- To compare the hemodynamic status of very preterm infants with RDS under HFOV versus CMV.
- To assess cardiac function, ductal patency, and cerebral blood flow in neonates receiving HFOV or CMV.
Main Methods:
- Thirty-two neonates (<30 wk gestation) with RDS were randomized to HFOV (n=15) or CMV (n=17).
- Hemodynamic status was assessed using echocardiography and cerebral Doppler-echography within 48 hours of life.
- Ventilator settings were standardized for comparison.
Main Results:
- Mean airway pressure was higher with HFOV.
- Right ventricular function was comparable between groups.
- Ductal closure was significant only in the CMV group.
- Left ventricular performance and contractility did not differ.
- HFOV group showed lower cerebral artery end-diastolic velocity and higher resistance index.
Conclusions:
- HFOV can be used without altering cardiac function in preterm infants with RDS.
- The left ventricle's limited ability to improve performance with ductal shunts under HFOV suggests a narrow optimal pressure range.
- Cerebral hemodynamics may be affected differently by HFOV compared to CMV.