Properties of the upper arm vascular bed investigated by electrical impedance measurements in healthy subjects

The fluid shifts of an upper arm tissue segment under an occluding cuff were estimated from electrical impedance measurements. This was done using parameter estimation with a model. The model included parameters describing the arterial and venous pressure-volume relationship. To gain insight into the precision of the method, repeated measurements were made on healthy volunteers. Most parameters showed a large variation (13–44 %). This variation could only partly be explained by variations in the measured quantities.