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Related Experiment Video

Updated: Jul 12, 2026

Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship
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Defining segments and phases of a time capnogram.

K Bhavani-Shankar1, J H Philip

  • 1Department of Anesthesiology, Perioperative, and Pain Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA. Bhavani@capnography.com

Anesthesia and Analgesia
|September 27, 2000
PubMed
Summary
This summary is machine-generated.

Integrating respiratory flow signals with capnography allows for precise identification of rebreathing. This method standardizes time capnogram interpretation, improving the detection of abnormal breathing patterns and enhancing clinical applications.

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Area of Science:

  • Anesthesiology
  • Respiratory Physiology
  • Medical Instrumentation

Background:

  • Current methods for dividing time capnograms into inspiratory and expiratory phases are arbitrary.
  • This arbitrary division hinders the immediate detection of rebreathing during ventilation.
  • Lack of standardized nomenclature complicates the interpretation of time capnograms.

Purpose of the Study:

  • To demarcate time capnograms into inspiratory and expiratory components using concurrent gas flow signals.
  • To facilitate the prompt and accurate detection of rebreathing.
  • To establish standardized nomenclature for improved understanding and interpretation of time capnograms.

Main Methods:

  • Utilized a Novametrix((R)) CO(2)-SMO plus respiratory profile monitor for simultaneous CO(2) and respiratory flow waveform display.
  • Recorded data during spontaneous and controlled ventilation in a circle system under conditions of no rebreathing and rebreathing.
  • Compared CO(2) and flow waveforms, leveraging similar response times, to define capnogram segments (Phase 0, I, II, III).

Main Results:

  • The end of expiration closely aligns with the CO(2) waveform downslope when rebreathing is absent.
  • Rebreathing prolongs the alveolar plateau, incorporating a portion of inspiration (Phase 0) and the expiratory plateau (Phase III).
  • Gas flow signals enable precise demarcation of inspiratory and expiratory segments, identifying rebreathing instantaneously.

Conclusions:

  • The arbitrary division of time capnograms is suboptimal for detecting rebreathing.
  • Demarcating capnograms using gas flow signals enables rapid identification of rebreathing causes.
  • This approach enhances the clinical utility of time capnography through standardized interpretation.