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Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship
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Cardiorespiratory coupling in mechanically ventilated patients studied via synchrogram analysis.

Davide Ottolina1, Beatrice Cairo2, Tommaso Fossali1

  • 1Department of Anesthesiology and Intensive Care Unit, ASST Fatebenefratelli Sacco, "Luigi Sacco" Hospital - Polo Universitario, Università degli Studi di Milano, Via G.B. Grassi 74, 20157, Milan, Italy.

Medical & Biological Engineering & Computing
|January 25, 2023
PubMed
Summary
This summary is machine-generated.

Mechanical ventilation significantly impacts cardiorespiratory synchronization in critically ill patients. Pressure control ventilation (PCV) shows the highest synchronization, while neurally adjusted ventilatory assist (NAVA) shows the least.

Keywords:
Cardiorespiratory couplingCritical care unitHeart rate variabilityMechanical ventilationRespiratory sinus arrhythmia, Autonomic nervous system

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Area of Science:

  • Cardiorespiratory Physiology
  • Critical Care Medicine
  • Biomedical Engineering

Background:

  • Respiration and cardiac activity are intrinsically linked, functioning as weakly coupled oscillators.
  • Mechanical ventilation can alter the natural cardiorespiratory interactions and phase synchronization.
  • Understanding these interactions is crucial for optimizing patient care in intensive settings.

Purpose of the Study:

  • To investigate and differentiate the effects of three mechanical ventilation modes on cardiorespiratory phase coupling.
  • To quantify the degree of cardiorespiratory synchronization under different ventilatory settings.
  • To determine how ventilatory modes influence the interplay between breathing and heart rate in critically ill patients.

Main Methods:

  • Cardiorespiratory phase synchronization analysis was performed using synchrograms.
  • The study included twenty critically ill patients undergoing mechanical ventilation.
  • Data were collected during three distinct ventilatory modes: pressure control ventilation (PCV), pressure support ventilation (PSV), and neurally adjusted ventilatory assist (NAVA).

Main Results:

  • Cardiorespiratory phase synchronization varied significantly across the tested ventilatory modes.
  • Pressure control ventilation (PCV) resulted in the highest degree of cardiorespiratory synchronization.
  • Neurally adjusted ventilatory assist (NAVA) demonstrated the weakest cardiorespiratory synchronization, with pressure support ventilation (PSV) in between.

Conclusions:

  • Pressure control ventilation (PCV) significantly enhances cardiorespiratory phase synchronization in mechanically ventilated patients.
  • Patient-driven modes like NAVA induce weaker synchronization compared to PCV.
  • The findings suggest that the regularity and strength of ventilatory support influence cardiorespiratory coupling, highlighting the dependence on the specific ventilatory mode.