Diameter of heart measured by intracavitary ultrasound.
D000818:Animals; D006328:Cardiac Catheterization; D002306:Cardiac Volume; D004285:Dogs; D004562:Electrocardiography; D006321:Heart / Q000000981:diagnostic imaging / Q000502:physiology*; D008722:Methods; D009991:Oscillometry; D011859:Radiography; D014159:Transducers; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography