Zeitschrift für Erkrankungen der Atmungsorgane
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Z Erkr Atmungsorgane · Jan 1989
Review[Equipment combination for the use of normal frequency and high frequency jet ventilation].
Over the last eight years high-frequency ventilation has been extensively evaluated both in the clinical and laboratory settings. Two types of jet ventilators for application of normofrequency and high-frequency jet ventilation have been developed. A combined equipment is described with gas mixer, heater-humidifier, monitoring, membrane solenoid valve and a special injection system.
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Z Erkr Atmungsorgane · Jan 1989
Comparative StudyIncrease of the oxygenation and decrease of the intrapulmonary peak pressure at constant mean airway pressure using high-frequency jet ventilation in adult rabbits with lavage-induced severe respiratory distress syndrome compared to conventional mechanical ventilation.
Reports are contradictory about the value of high-frequency jet ventilation (HFJV) in the treatment of respiratory distress syndrome (RDS) [10, 11, 18 - 1, 2, 22, 25]. In a preliminary study on rabbits with healthy as well as surfactant deficient lungs, caused by lung lavage, at a constant mean airway pressure (MAP) and 20% inspiration time, the influence of the jet ventilation frequencies of 1, 3, 5, 10, 15 and 20 Hz (cycles per second) on the pressure oscillations along the airways as well as on blood gas and cardiac parameters were investigated. It was presumed that the breathing level, e.g. functional residual capacity plus 50% of the tidal volume is the same at constant MAP. ⋯ Optimal gas exchange could be obtained at about 10 Hz. Decreasing cardiac output with increasing frequency showed a good correlation to the pH in both groups. The effect was more influenced by the heart frequency than by the stroke volume especially in the RDS-group.
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Z Erkr Atmungsorgane · Jan 1989
[Secretolysis using high frequency jet ventilation (HFJV) in ventilation obligatory status asthmaticus].
With high frequency jet-ventilation superimposed on intermittent positive pressure ventilation a good secretolysis was obtained. Preliminary results in patients with mechanical ventilation during status asthmaticus are presented.
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Z Erkr Atmungsorgane · Jan 1989
[Use of high frequency ventilation in patients with respiratory insufficiency].
High frequency ventilation is very common today for treatment of patients with respiratory insufficiency in the ICU as well as intraoperatively. This special kind of artificial ventilation is suitable for patients with decreased lung volume and reduced thoracic and lung compliance. Favourable results in the treatment of ARDS are described. ⋯ The resulting lower peak and mean airway pressure is advantageous. Therefore the barotrauma of the lung is reduced during high frequency ventilation. For these reasons high frequency ventilation is an alternative method for ventilation of patients with so called "stiff lungs" with reduced thoracic and lung compliance.