Some COVID-19 patients are presenting with silent hypoxia. Their oxygen levels are alarmingly low, ... In pneumonia and in ARDS, fluids in the lungs fill microscopic air sacs called alveoli, ...

What these tiny sacs in the lungs do and conditions that can affect them. Medically reviewed by Susan Russell, MD. Alveoli ...

COPD can lead to hypoxia, which is when cells or tissues in your body don’t get as much oxygen as they need. Learn more about its symptoms, causes, and treatments.

The term hypoxia is a condition where the tissues are not oxygenated adequately, ... Anatomic shunts are observed in cases wherein blood bypasses the alveoli, e.g., intracardiac shunts, ...

All diseases exist on a continuum, and the damage often begins early—sometimes as soon as a child is weaned off breast milk ...

Over time, COPD can lead to hypoxia, a condition marked by low oxygen levels. ... This is when oxygen is unable to pass through alveoli to oxygenate the blood. Circulatory hypoxia. Here, ...

Alveolar hypoxia (due to chronic lung disease or residence at high altitude) induces hypoxia-inducible factor 1 (HIF-1) activity in vascular smooth-muscle cells (SMCs), leading to decreased ...

In the neonatal rats exposed to hypoxia, the radial alveolar counts were decreased to 5.6 from 7.9 and the mean linear intercepts were increased to 56.5 μm from 38.2 μm.

In emphysema, the alveoli become abnormally inflated, damaging their walls and making it harder to breathe. People who smoke or have chronic bronchitis have an increased risk of emphysema.

An alternative explanation might be disequilibrium in pulmonary alveolar–end-capillary diffusion, which has been shown to occur in conditions of hypobaric hypoxia. 27,28 Previous investigators ...

As doctors see more and more COVID-19 patients, they are noticing an odd trend: Patients whose blood oxygen saturation levels are exceedingly low but who are hardly gasping for breath.