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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
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A Wearable Extracorporeal CO2 Removal System with a Closed-Loop Feedback.

Andrew Zhang1,2, Brian J Haimowitz1, Kartik Tharwani1

  • 1Extracorporeal Life Support Laboratory, Department of Surgery, University of Michigan, Ann Arbor, MI 48109, USA.

Bioengineering (Basel, Switzerland)
|October 25, 2024
PubMed
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This study introduces a novel wearable Extracorporeal Carbon Dioxide Removal (ECCO2R) system prototype. It automatically adjusts to metabolic changes, enabling physical therapy for respiratory failure patients.

Keywords:
Chronic Obstructive Pulmonary Disease (COPD)Extracorporeal CO2 Removal (ECCO2R)Extracorporeal Membrane Oxygenation (ECMO)ambulatory ECMOend-stage lung diseasenegative feedback systemssmart ECMOwearable medical devices

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Area of Science:

  • Biomedical Engineering
  • Respiratory Physiology

Background:

  • Extracorporeal Carbon Dioxide Removal (ECCO2R) systems aid severe respiratory failure patients.
  • Ambulation and physical therapy improve outcomes but are hindered by current ECCO2R system bulk and metabolic variability.

Purpose of the Study:

  • To develop and test the first prototype of a wearable ECCO2R system.
  • To create a system that dynamically adjusts to patient metabolic and acid-base changes.

Main Methods:

  • Developed a wearable ECCO2R system using exhaust gas CO2 (EGCO2) as a proxy for blood CO2 (pCO2).
  • Integrated twin blowers to modulate sweep gas flow based on real-time EGCO2 feedback.
  • Conducted 24-hour in vitro testing with water under simulated metabolic conditions and a single test with ovine blood.

Main Results:

  • The system rapidly adjusted sweep gas to meet target EGCO2 within 1 minute when challenged with varying inlet pCO2.
  • Negative feedback control maintained target EGCO2 more effectively than fixed sweep gas under flow variations.
  • Confirmed system functionality with whole blood.

Conclusions:

  • This wearable ECCO2R prototype represents a significant advancement in responsive extracorporeal support.
  • The technology facilitates physical therapy and enhances patient mobility and autonomy.
  • Further development is crucial for clinical translation of responsive wearable ECCO2R devices.