Analysis of conductance volumetric measurement error sources

DURING THE past ten years, measurement of ventricular volume by means of an intracardiac conductance catheter has become a challenging area of research for a number of investigators (BAAN, et al., 1981; GLANTZ, et aL, 1990; McKAY, et al. 1984; SALO, et al., 1986; SHNELLI, 1989). The development of a catheter-based device for real-time monitoring of ventricular volume and geometry would be an extraordinary resource for investigating global and regional ventricular functions. However, as summarised by Glantz et al., (GLANTZ, et al., 1990), experimental systems based on conductance catheter are non-linear and have significant limitations. The non-linear characteristics have been experimentally measured (MUR and BAAN, 1984), but have not been theoretically analysed and explained. Glantz et al. (GLANTZ et al., 1990) suggested that better methods of system calibration need to be developed, in order to be able to use the conductance catheter as a clinical tool.

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