Positive-pressure ventilation (PPV) may impair or improve tissue oxygen delivery depending on its overall effects on cardiac output, ventilation-perfusion matching, and alveolar oxygenation. Clinically relevant heart-lung interactions occur because of associated changes in lung volume, intrathoracic pressure (ITP), or metabolic load. All forms of ventilation increase lung volume: spontaneous ventilation decreases ITP while PPV increases ITP, and spontaneous ventilatory efforts constitute exercise. While lung volume and ITP are rarely measured, airway pressures and tidal volume are routinely defined.

Healthy Fat Loss For A Longer Life

Healthy Fat Loss For A Longer Life

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