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Drexler, M.; Erbel, R.; Dahm, M.; Mohr-Kahaly, S.; Oelert, H.; Meyer, J.
doi: 10.1007/BF01553933pmid: 3668299
In 17 patients (10 patients with mitral insufficiency, 5 patients with tricuspid regurgitation, 2 patients with mitral stenosis) the result of valve reconstruction was evaluated by intraoperative two-dimensional transesophageal contrast-echocardiography (TEE). Therefore, 1–2 cc of an agitated contrast-medium (GelifundolR) were injected into the left or right ventricle. The result of reconstruction was assessed by the extent of regurgitant microbubbles into the left or right atrium. A successful valve repair could be demonstrated in 15 patients without or with only minimal regurgitation of contrast-fluid. In one patient residual severe mitral insufficiency after valve reconstruction could only be detected when valve function was examined by contrast-TEE in the beating heart. An intraoperative decision for valve replacement was made. In another patient, mild to moderate residual mitral incompetence was shown; no further surgical intervention was done.
Mohr-Kahaly, S.; Erbel, R.; Steller, D.; Börner, N.; Drexler, M.; Meyer, J.
doi: 10.1007/BF01553934pmid: 3668300
The diagnostic value of transoesophageal echocardiography was evaluated in 24 patients with aortic dissection and compared to transthoracic two-dimensional echocardiography, computer tomography, aortography, surgery and autopsy.
Kalmanson, D.; Veyrat, C.; Gourtchiglouian, C.; Bas, S.; Abitbol, G.
doi: 10.1007/BF01553935pmid: 2959728
The flow mapping procedure has been developed in parallel to the standard pulsed Doppler procedure. It has a different purpose — picking up flow signals at the site of lesions rather than calibrating velocities — and has its own methodology, developed within the last six years.
Itti, R.; Casset, D.; Philippe, L.; Brochier, M.
doi: 10.1007/BF01553936pmid: 3499471
Images of radioactive tracer uptake are mainly functional images since the tracer distribution may directly be related to the regional variations in function, such as myocardial perfusion in the case of thallium-201 single photon tomography. Combination of pictures obtained in different physiological conditions (stress-rest, for instance) enhance the functional aspects of these studies.
Allessie, M.; Hoeks, A.; Schmitz, G.; Reneman, R.
doi: 10.1007/BF01553938pmid: 3668302
A simple but still versatile datalogging system based on a VCR (video cassette recorder) has been developed. The VCR allows mass storage of data originating from a maximum of 256 channels as used, for example, in the recording of the time-dependent potential distribution at the surface of the myocardium [1,2]. Incorporated in the system is a display memory allowing on-line simultaneous visualization of the assessed recordings of 16 channels. On an interactive base display parameters (time-window, channel-selection) can be altered without loss of data. A link with a personal computer allows modification of system parameters and storage of data for off-line analysis of the recorded data. The high data rate to and from the VCR (4.3 MHz) fully utilizes the bandwidth available. A normal videotape can, therefore, contain up to 2 Gigabyte of data. Despite this, the use of the tapecounter and the decoding of the time-code inserted into the signal allows quick retrieval of the stored data without needing expensive equipment. The system described brings mass data logging within the reach of a vast number of laboratoria and cardiovascular centers.
Wit, Andrew; Tischler, Abigail; Dillon, Stephen
doi: 10.1007/BF01553939pmid: 3668303
A recording system is described which enables extracellular electrical activity from a large number of sites on thein situ heart to be registered simultaneously. The usefulness of this approach for the study of arrhythmogenesis is discussed.
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The application of coronary angiography is limited because it requires arterial invasion and the direct injection of contrast agent into the coronary arteries. A prototype system has been developed which achieves sufficient sensitivity to the iodinated contrast agent to allow the visualization of coronary arteries in dogs after its intravenous injection. The system uses two fan beams of x-rays from an electron storage ring and a 300 element linear silicon detector. Two interlaced images, spaced at 150 eV above and below the K absorption edge of iodine (33.2 keV), are acquired and the logarithmic subtraction of these two images produces an image which has maximal sensitivity to iodine and minimal sensitivity to soft tissue and bone. This approach appears suitable for studies on human subjects.