High Frequency Jet Ventilation: The Influence of Gas Flow, Inspiration Time and Ventilatory Frequency on Gas Transport in Healthy Anaesthetized Dogs

Spoelstra, A. J. G.; Tamsma, T. J. A.

doi:10.1093/bja/59.10.1298

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…Results from previous experiments performed in our laboratory (1 ) and data from other authors (2-4) have shown that HFJV does not always provide adequate gas exchange.…”

mentioning

confidence: 66%

“…Intermittent positive pressure ventilation (IPPV) as a reference was alternated with HFJV in eight healthy anaesthetized mongrel dogs. An experimental jet ventilator with multiple solenoid valves (Siemens-Elema, Solna, Sweden) delivered HFJV via the jet lumen of a Hi-Lo jet tracheal tube (1).…”

Section: Methodsmentioning

confidence: 99%

“…HFJV was delivered for 10-min periods in random sequence using the following ventilator settings: frequency (4 1, 2, 4, and 8 Hz, inspiration time 40% of the total cycle time and valve setting 8; f 4 Hz and inspiration time 20, 40, 60 and 80% and valve setting 8, comparable to the ventilator settings of our previous study (1). Each period of HFJV was preceded by a period of IPPV (f= 12 bpm) with the tidal volume adjusted to produce an end-tidal COT of 5% (arterial Pcoz=4.77 f 0.07 kPa (mean SE)).…”

Section: Methodsmentioning

confidence: 99%

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Gas flow distribution and tidal volume during distal high frequency jet ventilation in dogs

Tamsma

Spoelstra

1989

Acta Anaesthesiol Scand

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During distal high frequency jet ventilation (HFJV) in anaesthetized healthy dogs gas flows were recorded at the proximal end of the open tracheal jet tube. Spirometer measurements of minute volumes with and without entrainment were made. During the inspiratory or insumation period, leakage of jet gas (bypass) could occur depending on the ventilator setting. From the gas flow recordings and the spirometer measurements, jet-, entrainment-and bypass minute volumes were determined. From these the effective minute volume, that is the minute volume of fresh gas entering the lungs, was calculated, as well as tidal volume. The results show that entrainment volumes are relatively small in an open system of distal HFJV and that at the same time bypass can (nearly) completely eliminate the effect of entrainment on tidal volume.

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“…Results from previous experiments performed in our laboratory (1 ) and data from other authors (2-4) have shown that HFJV does not always provide adequate gas exchange.…”

mentioning

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Gas flow distribution and tidal volume during distal high frequency jet ventilation in dogs

Tamsma

Spoelstra

1989

Acta Anaesthesiol Scand

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“…Iri distal HFJV the ventilatory circuit can be considvrrd to be an open system, so that part of the gas volume delivered by the ventilator may leak out during insumation as bypass volume after entrainment of gas during the start of jet insumation has ceased. In a prc.1 ious study we described this specific flow distribution during distal HFJV in an open circuit (9,10).…”

mentioning

confidence: 99%

Gas flow distribution in distal high frequency jet ventilation and lung thorax compliance

Spoelstra

Tamsma²

1991

Acta Anaesthesiol Scand

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To investigate the influence of changes in thorax and lung compliance on ventilation during distal High Frequency Jet Ventilation (HFJV), similar ventilator settings were compared before and after changing the compliance in two groups of anaesthetized mongrel dogs. Each period of distal HFJV was preceded by adequate Intermittent Positive Pressure Ventilation (IPPV) to assure a start with baseline values. In Group 1 (n = 7), thorax compliance was changed by chest strapping, while in Group 2 (n = 7) lung compliance was changed by inducing acute lung injury by injection of oleic acid into the right atrium. Gas flow distribution in the ventilatory circuit during distal HFJV was determined before and after the changes in compliance were induced. Comparing similar ventilator settings during distal HFJV in the same dog, a decrease in lung or thorax compliance led to changes in gas flow distribution in the ventilatory circuit. Entrainment was decreased and bypass increased with a negative effect on the gas volume entering the lungs and on gas exchange. The results indicate that distal HFJV should be regarded as pressure-limited ventilation.

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“…In the paper by Spoelstra and Tamsma [1] the authors comment on "the rectangular gas flow delivered by the HFJV unit" and, later in the paper, on "the rectangular form of the flow curve", yet their unit probably does not deliver a rectangular flow-time waveform from the jet nozzle. There are several reasons for suspecting this.…”

mentioning

confidence: 99%