Users' questions

Is there more ventilation at apex or base of lung?

Is there more ventilation at apex or base of lung?

Ventilation is 50% greater at the base of the lung than at the apex. The weight of fluid in the pleural cavity increases the intrapleural pressure at the base to a less negative value.

Which of the following is higher at the apex of the lung than at the base when a person is standing?

ventilation/perfusion ratio
The ventilation/perfusion ratio (V/Q ratio) is higher in zone #1 (the apex of lung) when a person is standing than it is in zone #3 (the base of lung) because perfusion is nearly absent.

What is dependent vs nondependent lung?

In the lateral decubitus position the dependent lung is under ventilated as it is compressed by the compression of the abdominal contents and the weight of the mediastinum. The nondependent lung is relatively over ventilated secondary to increased compliance as the corresponding hemithorax is opened.

What is the lung base?

Anatomically, the lung bases refer literally to the inferior concave surfaces of the lungs which directly contact the hemidiaphragms. The lung bases are also commonly considered as a review area in the reporting of abdominal CT which usually contains a small portion of the inferior portion of the lungs. …

What is the average minute ventilation?

Normal minute ventilation is between 5 and 8 L per minute (Lpm). Tidal volumes of 500 to 600 mL at 12–14 breaths per minute yield minute ventilations between 6.0 and 8.4 L, for example. Minute ventilation can double with light exercise, and it can exceed 40 Lpm with heavy exercise.

What does V Q stand for?

Perfusion
A VQ scan, also called a Ventilation (V) Perfusion (Q) scan, is made up of two scans that examine air flow and blood flow in your lungs. The first scan measures how well air flows through your lungs. The second scan looks at where the blood flows in your lungs.

Why in Zone 1 of the lungs there is no blood flow?

Zone 1 is defined as those areas of the lung where alveolar pressure exceeds that of the pulmonary arterial pressure. Consequently, the pulmonary arteries become compressed and shut, eliminating blood flow in this zone and thus creating a zone of dead space.

What is the difference between Type 1 and Type 2 respiratory failure?

Respiratory failure is divided into type I and type II. Type I respiratory failure involves low oxygen, and normal or low carbon dioxide levels. Type II respiratory failure involves low oxygen, with high carbon dioxide.

What is dependent densities in lungs?

Dependent opacity, also termed subpleural dependent density, consists of a stripe of ground glass attenuation 2 to 30 mm thick and is usually seen in the most dependent lung regions. It disappears when the lung is nondependent (3).

Are the lungs deep to the ribs?

“the lungs are deep to the rib cage.” close to the origin of the body part or the point of attatchement of a limb to the body trunk. farther from the origin of a body part or the point of attachement of a limb to the body trunk.

Why is the apex of the lung larger than the base?

Verified Account. The apex of the lung has substantially reduced blood flow when compared to the base due to the effects of gravity. The apex has a higher V/Q ratio than the base. Alveoli are the same size in the apex versus the base, though the base is more compliant leading to the alveoli appearing to be larger.

What happens to the V / Q ratio when the lung is upright?

The result is a large vertical variation of the V/Q ratio when the lung is upright. Higher V/Q ratios in the apex yield alveolar gas tensions closer to inspired air whereas lower V/Q ratios in the base yield alveolar gas tensions closer to venous blood.

Which is bigger the apex or the base?

The apex has a higher V/Q ratio than the base. Alveoli are the same size in the apex versus the base, though the base is more compliant leading to the alveoli appearing to be larger.

Why does the apex have lower blood flow than the base?

The apex of the lung has substantially reduced blood flow when compared to the base due to the effects of gravity. The apex has a higher V/Q ratio than the base.

Verified Account. The apex of the lung has substantially reduced blood flow when compared to the base due to the effects of gravity. The apex has a higher V/Q ratio than the base. Alveoli are the same size in the apex versus the base, though the base is more compliant leading to the alveoli appearing to be larger.

The apex has a higher V/Q ratio than the base. Alveoli are the same size in the apex versus the base, though the base is more compliant leading to the alveoli appearing to be larger.

Why do alveoli have higher V / Q ratio than base?

This question, it’s completely BS. The pulmonary pressure is the same throughout the lung. Alveoli are not larger in the apex versus the base. The apex of the lung has substantially reduced blood flow when compared to the base due to the effects of gravity. The apex has a higher V/Q ratio than the base.

The apex of the lung has substantially reduced blood flow when compared to the base due to the effects of gravity. The apex has a higher V/Q ratio than the base.