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Related Concept Videos

Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
Respiratory Volumes01:15

Respiratory Volumes

Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
Physiological Control of Respiration01:23

Physiological Control of Respiration

Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Respiratory Capacities01:24

Respiratory Capacities

Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
The Functional Residual Capacity (FRC) represents the air in the...
Respiratory Volumes and Capacities01:22

Respiratory Volumes and Capacities

The respiratory system is responsible for the intake of oxygen and the expulsion of carbon dioxide from the body. Respiratory volumes describe the volume of air in the lungs at different phases of the respiratory cycle. Tidal volume is the air breathed in and out during normal, quiet breathing. Inspiratory reserve volume is the air that can be forcefully inspired beyond the tidal volume. In contrast, expiratory reserve volume refers to the air that can be expelled from the lungs after a normal...
Physiology of Respiration II: Neurogenic Control of Respiration01:22

Physiology of Respiration II: Neurogenic Control of Respiration

The neurogenic control of respiration coordinates various neural networks and pathways to regulate breathing rate and depth, meeting the body's oxygen and carbon dioxide exchange requirements. This system adapts to physiological and environmental conditions, ensuring optimal breathing patterns.
Central Control
The brainstem is the primary site of central control, hosting respiratory centers:

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Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
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Respiratory control during volume-cycled ventilation in normal humans

A Puddy1, W Patrick, K Webster

  • 1Respiratory Investigation Unit, University of Manitoba, Winnipeg, Canada.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|May 1, 1996
PubMed
Summary

Neuromechanical inhibition is weak, offering minimal feedback to control breathing during high-volume mechanical ventilation. This study found no apnea or significant rate changes with increased tidal volumes (VT).

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Area of Science:

  • Physiology
  • Respiratory Medicine
  • Mechanical Ventilation

Background:

  • Mechanical ventilation can influence respiratory drive.
  • Understanding neuromechanical inhibition is crucial for optimizing ventilator settings.
  • High tidal volumes may suppress spontaneous breathing efforts.

Purpose of the Study:

  • To assess the inhibitory effect of high ventilation volumes on respiratory rhythm.
  • To quantify neuromechanical inhibition during volume-cycled mechanical ventilation.
  • To determine the negative feedback capacity of this inhibition on respiratory control.

Main Methods:

  • Two protocols were used in healthy awake subjects.
  • Protocol 1: Increasing tidal volume (VT) in assist/control mode and observing for apnea or rate reduction.
  • Protocol 2: Discontinuing controlled mechanical ventilation (CMV) during apnea and measuring time to next spontaneous effort.

Main Results:

  • Increasing VT in assist mode did not cause apnea and only modestly reduced respiratory rate (f).
  • End-tidal PCO2 (PETCO2) significantly decreased with higher VT.
  • No apnea was observed after CMV discontinuation; breath timing remained consistent.

Conclusions:

  • Neuromechanical inhibition is weak and provides minimal negative feedback.
  • It offers little help in controlling PCO2 during high VT demands.
  • Current mechanical ventilation strategies may not be significantly limited by this inhibitory mechanism.