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Related Concept Videos

Ventilatory Modes01:14

Ventilatory Modes

Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
Alterations in Respiration II01:30

Alterations in Respiration II

There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
Breathing01:05

Breathing

The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
Assessment of Respiration01:23

Assessment of Respiration

The respiratory system's basic structures and primary functions lay the foundation for nurses' comprehensive respiratory assessments. This assessment includes subjective and objective data to gauge the patient's respiratory health.
Subjective Assessment: Nurses interview the patient to gather information directly during the subjective assessment. It includes questions about the individual's medical history, medications, and symptoms, focusing on past respiratory conditions like asthma or COPD,...

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Related Experiment Video

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Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns
08:34

Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns

Published on: September 16, 2019

Model-based characterization of ventilatory stability using spontaneous breathing.

Shamim Nemati1, Bradley A Edwards, Scott A Sands

  • 1Massachusetts Institute of Technology, Cambridge, MA, USA. shamim@mit.edu

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 9, 2011
PubMed
Summary
This summary is machine-generated.

A new modeling method simplifies assessing respiratory control loop gain, crucial for understanding periodic breathing. Domperidone increased loop gain and hypoxic sensitivity in lambs, validating the model’s ability to predict ventilatory instability.

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Area of Science:

  • Physiology
  • Systems Biology
  • Computational Neuroscience

Background:

  • Cyclic ventilatory instabilities are often linked to increased chemoreflex feedback loop sensitivity or gain.
  • Conventional methods for characterizing this feedback loop are labor-intensive and complex.

Purpose of the Study:

  • To develop and validate a simplified method for estimating respiratory control system loop gain using trivariate autoregressive modeling.
  • To assess the impact of domperidone, a dopamine D(2)-receptor antagonist, on respiratory control parameters in newborn lambs.

Main Methods:

  • Trivariate autoregressive modeling was applied to ventilation, end-tidal Pco(2), and Po(2) data from spontaneous breathing in anesthetized newborn lambs.
  • Measurements were taken before and after domperidone administration to evaluate changes in chemoreflex and plant gains.
  • Model-predicted periodic breathing cycle duration was compared with experimentally observed values.

Main Results:

  • Domperidone administration significantly increased hypoxic ventilatory sensitivity (controller gain for O(2)) and the overall respiratory control system loop gain by over twofold.
  • No significant changes were observed in CO(2) controller gain or plant gains for O(2) and CO(2).
  • The model's prediction of periodic breathing cycle duration closely matched experimental measurements.

Conclusions:

  • Model-based analysis of spontaneous breathing provides a robust and simplified tool for characterizing respiratory control system dynamics.
  • This method can effectively identify individuals prone to ventilatory instability, aiding in the development of targeted therapies.