The rationale was to reduce hypoxemia, prevent airway closure, and increase functional residual capacity. Initially, mechanical ventilation involved delivering tidal volumes of 10 mL/kg of ideal body weight or higher.

The goal is to deliver a tidal volume large enough to maintain adequate ventilation but small enough to prevent lung trauma. Tidal volume is vital when it comes to setting the ventilator in critically ill patients. The volume of inspired and expired air that helps keep oxygen and carbon dioxide levels stable in the blood is what physiology refers to as tidal volume. Expiration occurs to expel carbon dioxide and prevent it from accumulating in the body. At the same time, carbon dioxide continuously forms as long as metabolism takes place. It then diffuses across the alveolar-capillary interface to reach arterial blood.

When a person breathes in, oxygen from the surrounding atmosphere enters the lungs. It is a vital clinical parameter that allows for proper ventilation to take place. It measures around 500 mL in an average healthy adult male and approximately 400 mL in a healthy female. Some apparatus dead space may actually reduce total dead space, as an ETT bypasses the majority of anatomical dead space of the patient (nasopharynx).ĭead space from the patient.Tidal volume is the amount of air that moves in or out of the lungs with each respiratory cycle. Types of Dead Spaceĭead space from equipment, such as tubes ventilator circuitry. Glomerular Filtration and Tubular Functionĭead space is the proportion of minute ventilation which does not participate in gas exchange. Functional Anatomy and Control of Blood Flow

Physiologic dead space definition