['Helicobacter pylori infection has been related to an increased risk of ischaemic heart disease (IHD) possibly by raising plasma fibrinogen. The evidence for this association is conflicting. Furthermore, no attempt has been made to distinguish between an effect on atheroma and thrombosis. We have determined the association of H. pylori status with IHD assessed by coronary angiography. We have also evaluated the influence of H. pylori infection on haemostatic factors.', 'Caucasian patients undergoing coronary angiography for suspected IHD were recruited. H. pylori status was determined by serology (Helico G). Plasma fibrinogen was measured by the Clauss assay. Coronary angiograms were assessed and significant atheroma defined as > or = 50% stenosis. A history of myocardial infarction was ascertained by WHO criteria.', '292 patients were recruited (median age 59, 95 female); 204 (70%) patients had IHD and 185 (64%) of all patients were H. pylori-positive; 68% patients with IHD were H. pylori-positive compared with 50% without IHD (P = 0.003). When adjusted for other risk factors by logistic regression, H. pylori remained significantly associated with IHD (odds ratio = 2.4, 95% CI = 1.2-5.1, P = 0.02). H. pylori status was not related to a history of myocardial infarction. Circulating levels of PAI-1, vWF, Factor VII and fibrinogen were not related to H. pylori status.'] Is helicobacter pylori infection related to atheroma in patients undergoing coronary angiography?