Document Detail

Two-frequency impedance plethysmograph: real and imaginary parts.
MedLine Citation:
PMID:  2325449     Owner:  NLM     Status:  MEDLINE    
A four-channel impedance plethysmograph has been designed. Impedance signals are obtained at two frequencies by measuring both real and imaginary parts. Particular attention has been paid to the sine wave generation circuits that provide system versatility. The required phase-sensitive demodulation is achieved by means of analogue multiplexers. Results show that there are significant variations in the thoracic equivalent capacitance related to respiration and that there is an increased sensitivity to cardiac activity at low frequencies.
A Lozano; J Rosell; R Pallás-Areny
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medical & biological engineering & computing     Volume:  28     ISSN:  0140-0118     ISO Abbreviation:  Med Biol Eng Comput     Publication Date:  1990 Jan 
Date Detail:
Created Date:  1990-05-24     Completed Date:  1990-05-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7704869     Medline TA:  Med Biol Eng Comput     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  38-42     Citation Subset:  IM    
Divisió de Instrumentació i Bioenginyeria, ETSE Telecomunicació, Barcelona, Spain.
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MeSH Terms
Analog-Digital Conversion
Heart / physiology
Plethysmography, Impedance / instrumentation*
Respiration / physiology

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