What occurs during positive pressure ventilation?

During positive pressure ventilation, the mechanics of breathing are altered to facilitate air movement into the lungs. This method involves creating a pressure differential; therefore, the pressure inside the thoracic cavity rises due to the influx of air.

When positive pressure is applied, air is pushed into the lungs, which results in an increase in intrathoracic pressure. This pressure change is critical as it allows air to flow into the lungs against the natural negative pressure that typically assists in ventilation during normal, spontaneous breathing. The increase in pressure aids in delivering oxygen-rich air to the alveoli, enhancing gas exchange within the lungs.

Understanding the physiology of positive pressure ventilation is crucial, especially in clinical settings where this method is used to support patients who cannot breathe adequately on their own.