Ascites takes its name from the leather wineskin a swollen belly resembles
Doctors can detect fluid pooling in the abdomen by tapping one flank and feeling a ripple arrive on the other side. That build-up, called ascites after the Greek word for a wine or water skin, most often signals advanced liver cirrhosis, and it carries a sobering outlook once it appears.
Strictly, ascites means more than 25 millilitres of fluid in the peritoneal cavity, though several litres can collect. Small amounts pass unnoticed; large ones stretch the abdomen, add weight and press on the diaphragm, leaving people feeling heavy and short of breath. A dangerous complication is spontaneous bacterial peritonitis, an infection of the fluid itself. The Latin term comes from Greek askites, a bag-like dropsy, named for the askos, a sheepskin container for wine, water or oil.
In wealthy countries cirrhosis is the leading cause, accounting for about 81 percent of cases in one breakdown, most of them linked to alcohol. The mechanism involves raised pressure in the portal vein system and faulty blood vessels. Cancer spreading to the abdominal lining accounts for about 10 percent, and tuberculosis about 2 percent. Heart failure, pancreatitis, blocked hepatic veins and kwashiorkor, a form of severe childhood malnutrition, can also produce it.
Examination relies on classic bedside signs: bulging flanks when lying down, a dull percussion note that moves when the person rolls onto their side, and in massive cases the fluid wave. Ultrasound or CT confirms it, and Doppler scans can show clots in the hepatic or portal veins. Drawing off a sample lets doctors compare albumin in blood and fluid; a gradient above 1.1 g/dL points to portal hypertension, and a lower value suggests another cause.
Mild cases, graded 1 to 3 by how visible they are, usually respond to cutting salt and taking diuretics, with fluid drained when needed. Refractory ascites keeps returning despite this, either because diuretics cause complications such as low potassium or because they simply fail. A shunt through the liver, known as TIPS, is an option with its own risks, and liver transplant addresses the root problem. More than half of people with cirrhosis develop ascites within ten years, and half of those die within three.
Source: Ascites
