| effect of chewing qat on mucosal histology and prevalence of helicobacter pylori in the oesophagus, stomach and duodenum of yemeni patients. | this investigation was aimed at assessing whether the yemeni habit of chewing qat on a regular basis had a significant effect on the upper alimentary tract. seventy patients with dyspepsia attending al-thawra hospital in taiz, yemen republic were examined by endoscopy. biopsies were taken from the oesophagus, stomach and duodenum. the patients included 28 who gave a history of daily qat intake, 21 with less frequent intake and 21 who took none. the only statistically significant finding associat ... | 1991 | 1757083 |