Pulmonary stretch receptor activity during partial liquid ventilation with different pressure waveforms

Esther Rieger-Fackeldey, Anders Jonzon, Andreas Schulze, Gunnar Sedin, Richard Sindelar

Research output: Contribution to journalArticlepeer-review

Abstract

Background: The aim of the present study was to investigate pulmonary stretch receptor activity (PSR) under different peak inspiratory pressures (PIPs) and inspiratory pressure waveforms during partial liquid (PLV) and gas ventilation (GV). Methods: PSR instantaneous impulse frequency (PSRfimp) was recorded from single fibers in the vagal nerve during PLV and GV in young cats. PIPs were set at 1.2/1.8/2.2/2.7 kPa, and square and sinusoidal pressure waveforms were applied. Results: PSRfimp at the start of inspiration increased with increasing PIPs, and was steeper and higher with square than with sinusoidal waveforms (p < 0.05). Total number of impulses, peak and mean PSRfimp were lower during PLV than GV at the lowest and highest PIPs (p < 0.025). Time to peak PSRfimp was shorter with square than with sinusoidal waveforms at all pressures and ventilations (p < 0.005). Irrespective of waveform, lower PIPs yielded lower ventilation during PLV. Conclusion: As assessed by PSRfimp, increased PIPs do not expose the lungs to more stretching during PLV than during GV, with only minor differences between square and sinusoidal waveforms.

Original languageEnglish
Article number103413
JournalRespiratory Physiology and Neurobiology
Volume276
DOIs
StatePublished - May 2020
Externally publishedYes

Keywords

  • Control of breathing
  • Partial liquid ventilation
  • Pressure controlled ventilation
  • Slowly adapting pulmonary stretch receptor

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