1Institute of Clinical Medicine, University of Tsukuba, 2Medical Equipment Engineering Depatment, Fujitsu Limited
Intracardiac echocardiography, Dog experiments multiplane, Transesophageal probe
We evaluated the effectiveness of a prototype multiplane transesophageal probe (5 MHz, 40 elements; probe size: 13 mm by 13 mm) in conducting intracardiac echocardiography in 7 dogs. The probe was inserted into the right atrium via the anterior right atrial wall and was positioned in the right atrium or the right ventricle. From a fixed probe position, the mechanical rotation of the scan head changes the image plane 0∼180, thus yielding multiplane orientaions. From the right atrium, we were able to image the cardiac structures under various orientations including long-axis and two-chamber views of the left side of the heart, as well as a four chamber view of the whole heart, and visualize transverse and longitudinal images of the ascending aorta. In addition, long-axis and short-axis views of the left ventricle could be obtained through the right ventricle. In three dogs, the wall motion abnormalities caused by acute myocardial infarction were continuously recorded. We concluded that multiplane orientations from a fixed probe position improve the imaging capabilities of intracardiac echocardiography and, when refined, could have many clinical applications.