| pattern of change in the frequency of helicobacter pylori with perforated duodenal ulcer. | peptic ulcers were believed to be caused by stress, dietary factors, and gastric acid, but the link between h. pylori and peptic ulcers was identified in 1983. to see the frequency of helicobacter pylori infection in patients with perforated duodenal ulcer and advise eradication therapy in these patients. this cross sectional study was conducted in surgical unit hayatabad medical complex, peshawar, during january 2007-june 2008. | 2008 | 19999201 |