title: R wave amplitude changes during transoesophageal atrial pacing in patients with chronic ischaemic heart disease.
abstract: 15 patients with intact coronary arteries (control group) and 49 patients with coronary stenosis were for the purpose of differential diagnosis of ischaemic heart disease [IHD] subjected to coronarography, left ventriculography and transesophageal atrial pacing. The possibility of using the sum R wave amplitude as a criterion of IHD was assessed, as well as the relation between the R wave amplitude and the left ventricular function indicators--the ejection fraction and the end-diastolic volume. It was found that the increase of the R wave amplitude has distinctly lower specificity (40%) and sensitivity (29%) than the ischaemic depression of the ST segment (73 and 74% respectively). No correlation was found between R wave amplitude changes and indicators of the left ventricular function. The increase in the R wave amplitude cannot be therefore regarded as a reliable criterion of IHD and is not a reflection of the functional state of the left ventricle.
mesh_terms: D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000175:diagnosis; D002302:Cardiac Output; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D003327:Coronary Disease / Q000175:diagnosis*; D004562:Electrocardiography; D004947:Esophagus; D006801:Humans; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis; D011379:Prognosis