What happens during negative pressure ventilation when the intrapleural space becomes negative?

During negative pressure ventilation, the goal is to create a negative pressure within the intrapleural space. When this negative pressure is achieved, it causes an increase in lung volume as the external atmospheric pressure becomes greater than the pressure within the pleural cavity. This results in air being drawn into the lungs, leading to inhalation.

The mechanics at play involve the diaphragm and intercostal muscles, which expand the thoracic cavity, further enhancing the negative pressure and facilitating airflow into the lungs. This is beneficial for patients who may have difficulties with spontaneous ventilation, as it helps to ensure proper gas exchange without the need for positive pressure techniques.

In this process, maintaining a negative pressure specifically draws air into the lungs, making it essential for effective ventilation in certain clinical scenarios. Therefore, the correct conclusion is that air is indeed drawn into the lungs during negative pressure ventilation.