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PLETHYSMOGRAPH

2014-11-10 07:11  
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PLETHYSMOGRAPH
Transistorized unit measures change in impedance of living tissue resulting from nonrythmic fluctuations of blood content Changes of 0.1% in total tissue impedance are detected by resistance bridge and phase-sensitive detector that scans bridge unbalance.-S. Bagno and F. M.Liebman, Impedance Measurements of Living Tissue, Electronics, 32:15, p 62-63.