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Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...

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Evaluating Regional Pulmonary Deposition using Patient-Specific 3D Printed Lung Models
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Modelling lung diffusion-perfusion limitation in mechanically ventilated SARS-CoV-2 patients.

Giuseppe Miserocchi1, Emanuele Rezoagli1,2, Agueda Muñoz-Del-Carpio-Toia3

  • 1Dipartimento di Medicina e Chirurgia, Università Milano-Bicocca, Monza, Italy.

Frontiers in Physiology
|July 29, 2024
PubMed
Summary

This study reveals that COVID-19 patients on mechanical ventilation experience decreased respiratory compliance. Non-survivors developed hypercapnia due to impaired CO2 removal, linked to high pressures compressing capillaries.

Keywords:
alveolar pressuredead spacediffusion limitationgas exchangeslung distensionmechanical ventilationperfusion limitationrespiratory compliance

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Area of Science:

  • Pulmonary Medicine
  • Critical Care Medicine
  • Respiratory Physiology

Background:

  • COVID-19 significantly impacts respiratory function, particularly in mechanically ventilated patients.
  • Understanding the evolution of respiratory parameters is crucial for managing severe cases.
  • High-altitude environments may influence respiratory physiology in critically ill patients.

Purpose of the Study:

  • To describe the daytime changes in respiratory parameters for mechanically ventilated COVID-19 patients.
  • To differentiate respiratory mechanics between survivors and non-survivors.
  • To investigate the gas exchange limitations in COVID-19 patients.

Main Methods:

  • Analysis of respiratory parameters in mechanically ventilated COVID-19 patients at high altitude (Arequipa Hospital, Peru).
  • Comparison of respiratory compliance, oxygen saturation (SatO2), and capnia between survivors and non-survivors.
  • Utilizing a model to partition diffusion and perfusion limitations in the air-blood barrier for gas exchange.

Main Results:

  • Both survivors and non-survivors showed decreased respiratory compliance, indicating fewer inflatable alveolar units.
  • All patients were hyperventilated with SatO2 maintained above 90%.
  • Non-survivors exhibited progressive hypercapnia, unlike survivors who remained normocapnic.
  • Impaired CO2 removal in non-survivors was linked to increased positive end-expiratory pressure (PEEP) and plateau pressure (Pplat), causing capillary compression and reduced air-blood contact time.

Conclusions:

  • Mechanical ventilation in COVID-19 patients leads to reduced respiratory compliance.
  • Progressive hypercapnia in non-survivors suggests a shift towards perfusion limitation in gas exchange.
  • Increased ventilatory pressures (PEEP, Pplat) contribute to impaired CO2 removal by affecting pulmonary microcirculation.