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A gas bubble may be placed inside the eye, to keep the retina in place. If a gas bubble is used, sometimes a certain head positioning (posturing) has to be maintained, such as face down or sleeping on the right or left side. The gas bubble will dissolve over time, but this takes several weeks.
Vitreous hemorrhage is the extravasation, or leakage, of blood into the areas in and around the vitreous humor of the eye. [1] The vitreous humor is the clear gel that fills the space between the lens and the retina of the eye.
Visual representation of an eye with a gas bubble looking at a bouquet of flowers (8 days after vitrectomy surgery). Vitrectomy is a surgical procedure used to treat complicated retinal detachments. [8] It is especially useful for large retinal tears or tears that are not easily visible. [8]
The gas in a bubble will equilibrate with the surrounding tissues and will therefore contain water vapor, oxygen, and carbon dioxide, as well as the inert gas. Vascular bubbles appear to form at the venous end of capillaries and pass through the veins to the right side of the heart, and thereafter are circulated to the lungs. [73]
Depressurisation causes inert gases, which were dissolved under higher pressure, to come out of physical solution and form gas bubbles within the body. These bubbles produce the symptoms of decompression sickness. [17] [52] Bubbles may form whenever the body experiences a reduction in pressure, but not all bubbles result in DCS. [53]
The gas-filled microbubbles, typically air or perfluorocarbon, oscillate, and vibrate if a sonic energy field is applied and may reflect ultrasound waves. This distinguishes the microbubbles from surrounding tissues. Because gas bubbles in liquid lack stability and would therefore quickly dissolve, microbubbles are typically encapsulated by shells.
A gas bubbler acts as a one-way valve—gases (hot air, evolved gases, solvent vapors) from the inlet will bubble through the fluid before being vented to the atmosphere. If there were an underpressure in the reaction vessel (such as when heat is removed, and the gases within contract), some fluid is sucked into a sump to equalize the pressure ...
In later stages of decompression, a bubble that has taken up a large quantity of dissolved gas from the adjacent tissue in a joint is considered the critical event for a type I decompression injury. A bubble reaching a critical volume is assumed to have a mechanical effect on the nerve endings in the vicinity, causing pain in a tendon.