Studies have shown that "Helicobacter pylori" along with cirrhosis of the liver cause hepatic encephalopathy and hepatic coma. "Helicobacter pylori" are microbial ureases found in the stomach. As ureases they hydrolyze urea to produce ammonia and carbonic acid. As the bacteria are localized to the stomach ammonia produced is readily taken up by the circulatory system from the gastric lumen. This results in elevated ammonia levels in the blood and is coined as hyperammonemia, eradication of "Heliobacter pylori" show marked decreases in ammonia levels.