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Constant-flow ventilation during experimental left ventricular failure.

T Hachenberg1, J Meyer, A Sielenkämper

  • 1Department of Anaesthesiology, Westfälische Wilhelms-Universität, Münster, FRG.

Acta Anaesthesiologica Scandinavica
|April 1, 1990
PubMed
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Constant-flow ventilation (CFV) showed increased ventilation-perfusion mismatching in dogs, especially at higher flow rates. Left ventricular failure worsened gas exchange, but CFV did not significantly alter P(A-a)O2 values between healthy and failing states.

Area of Science:

  • Cardiopulmonary Physiology
  • Respiratory Mechanics
  • Critical Care Medicine

Background:

  • Constant-flow ventilation (CFV) is an alternative to conventional mechanical ventilation (CMV).
  • Its efficacy, particularly in the context of cardiac dysfunction, requires further investigation.
  • Understanding ventilation-perfusion (VA/Q) matching is crucial for optimizing oxygenation.

Purpose of the Study:

  • To evaluate the cardiopulmonary effects of CFV in dogs with normal heart function and induced left ventricular failure (LVF).
  • To compare CFV with conventional mechanical ventilation with positive end-expiratory pressure (CMV + PEEP).
  • To assess the impact of CFV on gas exchange and hemodynamic parameters under varying cardiac conditions.

Main Methods:

  • CFV was delivered using heated, humidified, oxygen-enriched air (Fio2 = 0.4) at two flow rates (1.2 and 1.6 l/kg/min) via endobronchial catheters.

Related Experiment Videos

  • CMV with PEEP (0.5 kPa) served as the reference ventilation mode.
  • Left ventricular failure was induced by occluding the left anterior descending coronary artery; hemodynamic parameters and extravascular lung water (EVLW) were measured.

    • Main Results:

    • In healthy dogs, CFV increased the alveolo-arterial PO2 difference (P(A-a)O2), indicating greater VA/Q inhomogeneity.
    • LVF induction led to decreased cardiac output, increased filling pressures, and elevated EVLW.
    • While oxygenation deteriorated in LVF, CFV at 1.6 l/kg/min worsened cardiopulmonary performance and gas exchange more than CMV + PEEP due to increased VA/Q mismatching.

    Conclusions:

    • CFV can increase VA/Q mismatching, particularly at higher flow rates, even in healthy hearts.
    • In the setting of LVF, CFV may further compromise gas exchange compared to CMV + PEEP.
    • The impact of CFV on P(A-a)O2 did not significantly differ between control and LVF phases, suggesting a consistent effect on VA/Q distribution.