Vq Ratio At Apex And Base

The ventilation perfusion ratio is exactly what you think it should be the ratio between the amount of air getting to the alveoli the alveolar ventilation v in mlmin and the amount of blood being sent to the lungs the cardiac output or q also in mlmin.

Vq ratio at apex and base. Learn vocabulary terms and more with flashcards games and other study tools. The vq ratio can therefore be defined as the ratio of the amount of air reaching the alveoli per minute to the amount of blood reaching the alveoli per minutea ratio of volumetric flow rates. As such the overall value in the average human is closer to 08. For example the ratio is roughly 33 in the apex of the lung and only 063 in the base.

Start studying vq ratios of the lungs 2 62. Start studying ventilation perfusion ratio. Zone 1 has the lowest blood flow the lowest ventilation and highest vq. Zone 3 has the highest blood flow the highest ventilation and the lowest vq.

Learn vocabulary terms and more with flashcards games and other study tools. Ventilation such that the apex has a higher vq and base has a lower vq. These two variables v q constitute the main determinants of the blood oxygen o 2 and carbon dioxide co 2 concentration. As such the ideal vq ratio would be 1 however the ratio varies depending on the part of the lung.

Ventilation perfusion ratio vq ratio definition vq ratio is literally the ratio between the amount of air getting into the alveoli measured as alveolar ventilation in mlmin and the amount of blood being sent to the lung measured as cardiac output co in mlmin. Learn vocabulary terms and more with flashcards games and other study tools. Higher vq ratios in the apex yield alveolar gas tensions closer to inspired air whereas lower vq ratios in the base yield alveolar gas tensions closer to venous blood. Significance the vq ratio of the upper lung levels is quite high yielding alveoli that are well ventilated but poorly perfused.

This limits the amount of alveolar dead space that occurs and minimizes the wasted work that occurs with alveolar dead space. In cases of high vq ratio the bronchi will constrict slightly to increase the resistance and decrease the amount of ventilation coming into an area that is not well perfused.