Impedance techniques are noninvasive and simple methods for the quantification of fluid volumes in the body. Tissue impedance, determined at multiple frequencies, offers the possibility of detecting total body water and extracellular and intracellular fluid volume. The major clinical applications are assessment of dry weight and the study of fluid shifts within the body, e.g., during hemodialysis, and in the thorax (pulmonary edema). Impedance cardiography monitors the heart-synchronous impedance changes in the thorax. It is an accurate method to calculate stroke volume, left ventricular ejection fraction, and systolic time intervals. Both methods have been validated extensively and deserve more appreciation for noninvasive monitoring in medicine.
|Number of pages||5|
|Journal||Journal of Cardiovascular Diagnosis and Procedures|
|Publication status||Published - 1 Jan 1996|