Relationship Between Atrial Pressures and the Interventricular Pressure in the Moving Actuator Type Total Artificial Heart View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1998

AUTHORS

Y. H. Jo , W. W. Choi , J. M. Ahn , S. K. Park , J. J. Lee , K. S. , J. S. Choi , W. K. Kim , Y. S. Won , H. C. Kim , B. G. Min

ABSTRACT

The right and left atrial pressures are important parameters in the automatic control of a total artificial heart (TAH) within normal physiological ranges. Our TAH is composed of a moving actuator, right and left ventricles, and the interventricular space (IVS) enclosed by a semirigid housing. During operation of the TAH, the IVS volume is changed dynamically by the difference between the ejection volume of one ventricle and the inflow volume of the other. Therefore, the change in pressure of the IVS is related to both right and left atrial pressures. We measured the interventricular pressure (IVP) waveform using a pressure sensor and attempted to estimate indirectly the changes in atrial pressures. This method has the advantage that the sensor does not contact the blood directly. Furthermore, the IVP waveform has a zero baseline in each pump cycle, thus the pressure measurements are free from transducer drift problems because the peak pressure can be measured from these baseline values. From in vitro experiments, we found that the IVP waveform contained several useful parameters such as negative peak IVP value, dP/dton the initial break, and the area enclosed by the profile for each stroke, each of which are associated with the left and right atrial pressures and the filling conditions of the ventricles. The measured atrial pressures were linearly related to the negative peak value of the interventricular pressure. More... »

PAGES

428-432

Book

TITLE

Heart Replacement

ISBN

978-4-431-65923-5
978-4-431-65921-1

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-4-431-65921-1_65

DOI

http://dx.doi.org/10.1007/978-4-431-65921-1_65

DIMENSIONS

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