An ambulatory ventricular function monitor: validation and preliminary clinical results |
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Authors: | R A Wilson P J Sullivan R H Moore J S Zielonka N M Alpert C A Boucher K A McKusick H W Strauss |
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Affiliation: | From the Division of Nuclear Medicine and Cardiac Unit, Departments of Radiology and Medicine, Massachusetts General Hospital, Boston, Massachusetts U.S.A. |
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Abstract: | A device for the continuous measurement of left ventricular (LV) function was tested in a series of 34 subjects. The instrument consisted of 2 arrays of radiation sensitive cadmium telluride detectors held in place over the region of the left ventricle and lung by a vest-like garment (hence the name VEST). The VEST electronic instrumentation included analog-to-digital converters, a battery pack, microprocessor and gating device, which were worn in a back pack. Data generated by the VEST, including the digitized average electrocardiogram, RR interval, counts/13 ms in each radiation detector, and time since commencement of data recording, were recorded on a cassette tape recorder every 2 minutes for subsequent analysis. At the conclusion of conventional multigated blood pool imaging, the VEST was positioned and worn by the subjects while supine, standing in place and walking. The correlation of ejection fraction calculated independently from the VEST and scintillation camera data was greater than 0.95. The inter-record reproducibility of the ejection fraction measured by the VEST in sedentary subjects was less than 3%. |
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Keywords: | Address for reprints: H. William Strauss MD Nuclear Medicine Division Massachusetts General Hospital Boston Massachusetts 02114. |
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