SUMMARY The tricuspid valve was studied in 143 subjects using two dimensional echocardiography. The groups studied were 40 normal subjects, 31 1 February 1983 years, range 17 to 79 years). Group 5 consisted of 30 patients (16 male, 14 female patients, mean age 44-8 years, range 8 to 85 years) with miscellaneous cardiac conditions, including chronic rheumatic heart disease, ischaemic heart disease, lone artrial fibrillation, and cardiomyopathy. None of these patients had clinical features of significant right heart disease and tricuspid regurgitation was not suspected.Echocardiograms were recorded using a SmithKline Ekosector I mechanical sector scanner or a Hewlett Packard phased array ultrasound imaging system, model 77020A. Transducers giving 300 and 80" images were available on the Ekosector I, but the 30°transducer gave better definition of leaflet movement, and the images were recorded on a Sanyo videotape recorder. 2-5 MHz and 3-5 MHz transducers were used on the phased array system and the images recorded on a Sony Betamax videorecorder. In both cases images were viewed in slow motion and frame by frame for analysis, and still frame photo-
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.