The importance of tidal volume and its monitoring during high-frequency ventilation
Authors:
Roubík Karel 1; Pachl Jan 2
Authors place of work:
České vysoké učení technické v Praze, Fakulta biomedicínského inženýrství
1; Klinika anesteziologie a resuscitace 3. LF UK a FNKV, Praha
2
Published in the journal:
Anest. intenziv. Med., 20, 2009, č. 1, s. 18-24
Category:
Intesive Care Medicine - Review Article
Summary
Even though High-Frequency Ventilation (HFV) meets criteria defining so called protective ventilatory strategy, HFV is not widely used in the clinical practice. Rational initiation of HFV and consequent maintenance of a constant ventilation belong to the limiting factors. Tidal volume is a parameter playing a crucial role in HFV. In the initial phase of HFV, monitoring of tidal volume allows reaching normocapnia promptly. As tidal volume generated by the ventilator depends on the relationship between the output impedance of the ventilator and the connected impedance of the respiratory system, stability of the adjusted ventilatory regimen also depends on this relationship. Furthermore, the effect of the connected impedance changes upon the delivered tidal volume differs in conventional and in high-frequency ventilation. Tidal volume plays also other important roles during high-frequency ventilation; tidal volume affects oxygenation much strongly during HFV than during conventional ventilation. Considering the differences between conventional and high-frequency ventilation and considering the effects of tidal volume changes during HFV, continuous monitoring of tidal volume seems to be essential for the rational and efficient application and control of high--frequency ventilation.
Keywords:
high-frequency ventilation – tidal volume – impedance – ventilator – oxygenation – monitoring
Zdroje
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Štítky
Anaesthesiology, Resuscitation and Inten Intensive Care MedicineČlánok vyšiel v časopise
Anaesthesiology and Intensive Care Medicine
2009 Číslo 1
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