- Title
- Impedance cardiography: clinical limitations and accuracy
- Creator
- Traugott, F. M; Quail, A. W.; White, Saxon William; Letchford, P. J.; Moore, P. G
- Relation
- 5th International Conference on Electrical Bio-impedance (ICEBI). Proceedings of 5th International Conference on Electrical Bio-impedance (ICEBI) (Tokyo, Japan August, 1981) p. 21-24
- Resource Type
- conference paper
- Date
- 1981
- Description
- The capacity of impedance cardiography (IC) to measure stroke volume (SV) accurately has been examined under widely varying conditions of SV, thoracic size, haemotocrit (Hct), heart rate (HR) and myocardial inotropy in dog models in experimental complete heart block, and in man and rabbits. In vivo blood resistivity (p) is essentially constant at 135 ± l.OΩ.cm over a wide range of Hcts (26%-66%) in mammalian species. Using in vivo p in the Kubicek formula the accuracy of a single estimate of SV is about 3% of the true SV, over a range of SV from 1.0-120.0 ml, of HR from 60 to 300 min-1, of resting to maximal myocardial inotropy, and of thoracic anatomy, e.g. rabbit, dog, and adult man. The technique overreads at heart rates less than 60 min⁻¹, and underreads slightly at high inotropic states, as in maximal exercise. Tile accuracy of the method compares favourably with the clinical right heart thermodilution method used in our laboratory (i.e. better than ±9% of true SV).
- Subject
- impedance cardiography; stroke volume; Kubicek formula; myocardial inotropy
- Identifier
- http://hdl.handle.net/1959.13/939867
- Identifier
- uon:12892
- Language
- eng
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