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Hemodynamic effects of high-frequency oscillatory ventilation in severe pediatric respiratory failure
J A Gutiérrez1, D L Levin, L O Toro-Figueroa
1Children's Medical Center of Dallas, PICU Office, TX 75235, USA.
Insights
High mean proximal airway pressures during high-frequency oscillatory ventilation (HFOV) improved oxygenation in pediatric patients with severe respiratory failure. Cardiovascular effects were minimal, with only a decrease in heart rate observed.
Area of Science:
- Pediatric Critical Care Medicine
- Respiratory Physiology
- Mechanical Ventilation
Background:
- Severe respiratory failure in pediatric patients often necessitates advanced ventilatory support.
- High-frequency oscillatory ventilation (HFOV) is an alternative to conventional mechanical ventilation (CMV).
- The hemodynamic effects of high mean proximal airway pressures (Paw) during HFOV in non-neonatal pediatrics are not fully understood.
Purpose of the Study:
- To evaluate the hemodynamic impact of high Paw during HFOV in pediatric patients with severe respiratory failure.
- To assess changes in oxygenation and cardiovascular parameters under HFOV.
- To determine the safety of high Paw HFOV in this patient population.
Main Methods:
- Prospective and retrospective study design.
- Inclusion of 8 non-neonatal pediatric patients with severe respiratory failure requiring HFOV.
- Utilized pulmonary artery catheters for hemodynamic monitoring.
Main Results:
- Higher Paw was required during HFOV for adequate lung expansion compared to CMV (p=0.008).
- HFOV significantly improved oxygenation, as indicated by a reduced alveolar-arterial oxygen difference (p=0.03).
- A significant decrease in heart rate was observed (p=0.03), but other cardiovascular parameters remained largely unchanged.
Conclusions:
- High Paw HFOV can improve oxygenation in pediatric patients with severe respiratory failure.
- While requiring cautious use, high Paw HFOV appears to have no significant adverse cardiovascular effects in most pediatric patients.
- Further research may be warranted to optimize HFOV settings and monitor long-term outcomes.
Objective:
To assess the hemodynamic effects of high mean proximal airway pressures (Paw) during high-frequency oscillatory ventilation (HFOV) in non-neonatal pediatrics patients with severe respiratory failure.
Design:
Prospective and retrospective study.
Setting:
Pediatric ICU in a university-affiliated hospital.
Patients:
8 non-neonatal pediatric patients with severe respiratory failure ventilated with HFOV at our institution between July 1991 and February 1994. All patients had a pulmonary artery catheter.
Interventions:
HFOV.
Measurements And Results:
Higher Paw was required during HFOV to obtain adequate lung expansion during the first 24 h (median 20.9 cmH2O, range 16.9-30.0 cmH2O in CMV, versus median 30.0 cmH2O, range 21.0-33.0 cmH2O in HFOV, p = 0.008), resulting in improved oxygenation as evaluated by alveolar-arterial oxygen difference (median of 557.2 mmHg, range 360.4-607.8 mmHg in CMV, versus median of 410.5 mmHg, range 282.9-550.2 mmHg after 24 h of HFOV, p = 0.03). The only observed effect on the cardiovascular system was a decrease in heart rate (median of 162, range 129-178 in CMV, versus median of 142, range 104-195 after 24 h of HFOV, p = 0.03). Oxygen delivery, cardiac index, mean systemic arterial blood pressure, and pulmonary and systemic vascular resistances did not change significantly before and after HFOV in the patients as a group, although in one case a decrease in cardiac index and oxygen delivery was observed.
Conclusions:
High-Paw HFOV must be used cautiously, but seems to have no discernible adverse effects on the cardiovascular system in most patients.