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Pathophysiology of obesity hypoventilation syndrome (OHS).

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1 Pathophysiology of obesity hypoventilation syndrome (OHS).
Pathophysiology of obesity hypoventilation syndrome (OHS). The implicated mechanisms leading to daytime hypercapnia are, potentially, the obesity-related changes in the respiratory system, central hypoventilation, obstructive sleep apnoeas and hypoventilation during sleep, mainly during rapid eye movement (REM). PEEPi: intrinsic positive end-expiratory pressure; PaO2: arterial oxygen tension; FRC: functional residual capacity; ERV: expiratory reserve volume; RV: residual volume; TLC: total lung capacity. Juan F. Masa et al. Eur Respir Rev 2019;28:180097 ©2019 by European Respiratory Society

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The most important function of the lungs is to maintain tension of oxygen and carbon dioxide of the arterial blood within the normal range.
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Pulmonary response in sarcoidosis
Copyright © 2015 by the American Osteopathic Association.

Copyright © 2015 by the American Osteopathic Association.
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Flow diagram summarising the most important effects of biochemical (left) and mechanical (right) pregnancy-induced factors on pulmonary function, ventilatory.
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Lab 11: Pulmonary Ventilation

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Representative, schematic diagram showing the pressure–volume curves of the respiratory system (RS, blue curves) and its two components, i.e. the chest.

Representative, schematic diagram showing the pressure–volume curves of the respiratory system (RS, blue curves) and its two components, i.e. the chest.
Schematic representation of breathing levels during positive expiratory pressure in an obstructed patient. Schematic representation of breathing levels.

Schematic representation of breathing levels during positive expiratory pressure in an obstructed patient. Schematic representation of breathing levels.
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Representative diaphragm electromyogram (EMG) tracings at rest (a and b) and during maximum voluntary ventilation (c and d) in a healthy subject (a and.

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Changes in operating lung volumes are shown as ventilation increases with exercise in a) age-matched normal subjects (n = 25) and b) chronic obstructive.
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