Emphysema is a lung condition. There is nothing called "emphysema of the gallbladder".
Perhaps you mean Emphysematous cholecystitis, called clostridial cholecystitis, which is an acute infection of the gallbladder wall. It is caused by Clostridium or Escherichia coli and is generally considered a surgical emergency.
Most often the causes of a decompressed gallbladder are gall stones. This is not the only cause and can only be addressed by a licensed physician. The official term of a decompressed gallbladder is acute cholecystitis.
A block in the cystic duct or common bile duct can cause dilation of Gall bladder.
Block can be due to stricture or stones.
A decompressed gallbladder is one for which internal pressure has been decreased.A decompressed gallbladder is one for which internal pressure has been decreased.
Horses don't have a gallbladder.
Chronic cholecystitis is one cause of a small gallbladder.
When you eat a lot of birds and stones.
As air rises it becomes decompressed, which causes it to cool. This cooling can cause water vapor to condense, forming clouds.
Gallstones
When magma is underground it is under enormous pressure, which causes the gasses to dissolve in the magma. As the magma rises pressure decreases and the gasses come out of solution. All gasses expand when decompressed.
gallbladder pain
Patients who have evidence of gallbladder perforation or gangrene need to have an immediate cholecystectomy.
Cholecystokinin
The build up of calcium, iron, or cholesterol in the gallbladder creates gallstones.
Rupture of the gallbladder is a medical condition in which the gallbladder begins to leak or bursts. Ruptures are most commonly caused by an inflammation of the gallbladder. The most common causes are gall stones, which get stuck inside the gallbladder. Untreated, a ruptured gallbladder can result in an infection in the bloodstream (septicemia). Such an infection can be fatal.