[Noninvasive monitoring of pneumatically driven blood pumps based on measurements of air volume flow in the drive hose].
A computer-assisted measuring system for the noninvasive control of pneumatically driven blood pumps in the artificial total heart replacement and in assist-systems is described. Air volume current measurements with heat wire anemometer in the driving tube underlie as principle. The technique takes into consideration losses of valves, depending upon driving parameters and central circulatory parameters. The dependences established base on measurements at the circulation model. The methods demonstrated allow to qualitatively characterize the signals of the air volume current in the driving tube and approximatively to determine central circulatory parameters on the basis of comparative measurements at the circulation model. Animal-experimental experiences confirm the necessary application of such systems for the measurement of the cardiac output and for the control of the pumping function of pneumatically driven blood pumps. Analyses at the circulation model let expect a measuring error for the volume of output smaller than 20%. By increased measuring exactness of the heat wire anemometer this error can be diminished. For final evidence concerning the measuring exactness animal-experimental investigations and comparisons with reference techniques are provided.
Klinik für Innere Medizin, Bereich Medizin, Wilhelm-Pieck-Universität Rostock.
K P
KP
Schmitz
H J
HJ
Nabel
W
W
Scharf
W
W
Urbaszek
H
H
Klinkmann
D000465:Algorithms; D000818:Animals; D001243:Assisted Circulation; D003201:Computers; D004868:Equipment Failure; D006354:Heart, Artificial; D006353:Heart-Assist Devices; D006355:Heart-Lung Machine; D006801:Humans; D012984:Software; D013318:Stroke Volume; D013599:Systole
Nichtinvasive Uberwachung pneumatisch angetriebener Blutpumpen auf der Grundlage von Luftvolumenstrommessungen im Antriebsschlauch.