title: Alterations of surface electrocardiogram in 35 patients during upper fiberendoscopy.
mesh_terms: D000328:Adult; D000368:Aged; D004562:Electrocardiography; D005260:Female; D005336:Fiber Optic Technology; D005773:Gastroscopy / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D013272:Stomach Diseases / Q000175:diagnosis*; D013610:Tachycardia / Q000209:etiology