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Updated: Aug 14, 2026

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique
Published on: May 15, 2013
Mechanical ventilation for pulmonary disease. A six year survey
Abstract:
Between 1972 and 1977, 91 patients received mechanical ventilation for pulmonary disorders. Forty-nine (53.8%) left hospital and 35 of these survived for at least 1 year. Nineteen of 23 asthmatic patients survived. Cerebral damage following cardiorespiratory arrest precluded successful outcome in three of the four who died. In those with chronic lung diseases, patients with chronic bronchitis fared best; outcome was poor in those with emphysema, bronchiectasis and pulmonary fibrosis often despite trivial precipitating causes of respiratory failure. Mortality was high in patients with pneumonia even if immunologically normal.
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Assessment of Ventilation II: Respiratory Depth and Rhythm
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:
Factors Affecting Pulmonary Ventilation
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The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
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Negative-pressure ventilators create a vacuum around the chest or body to draw air into the lungs, simulating breathing. This method does not require an...
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Noninvasive Positive-Pressure Ventilation (NIPPV)
Ventilatory Modes
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...

