The effect of blood resistivity changes in major vessels on the cardiogenic impedance signal was studied using three dimensional (3D) finite difference models of human thorax. The vessels studied included ascending aorta (AA), descending aorta (DA), common carotid artery (CA), superior vena cava (SVC), inferior vena cava (IVC) and internal jugular vein (JV). The end systolic data indicate that the impedance varies linearly with the percentage (%) change of blood resistivity in all vessels (R2>0.99). For a given blood resistivity change, the relative contributions are 34 % from 1)A, 27% from AA, 18% from SVC, 8% from CA, 7% from IVC and 6% from JV (the total is 69% from arteries and 31 % from veins). The results suggest that the blood resistivity change plays a major role in impedance cardiography to account for the negative impedance change (ΔZ) normally recorded from subjects.
|Original language||English (US)|
|Title of host publication||Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 1992|
|Editors||Jean Louis Coatrieux, Robert Plonsey, Swamy Laxminarayan, Jean Pierre Morucci|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||2|
|State||Published - 1992|
|Event||14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 1992 - Paris, France|
Duration: Oct 29 1992 → Nov 1 1992
|Name||Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS|
|Conference||14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 1992|
|Period||10/29/92 → 11/1/92|
Bibliographical notePublisher Copyright:
© 1992 IEEE.