NDLI: Unrestrained Acoustic Plethysmograph for Measuring Tidal Volume in Mice

Content Provider	Springer Nature Link
Author	Reylds, Jeffrey S. Frazer, David G.
Copyright Year	2006
Abstract	The traditional method for measurement of tidal volume in unrestrained mice relies on pressure changes induced by a freely respiring animal in a whole body plethysmograph. These changes have been assumed to be the result of thermo-hygrometric differences between respired air and gas within the chamber. It is known, however, that gas compression in the lung can also contribute significantly to changes in plethysmograph pressure. This study describes an acoustic plethysmograph for mice that is capable of measuring the tidal volume time series without the errors associated with the traditional method.The plethysmograph was designed as a resonating cavity at a fixed frequency. It had a sharp resonant peak and was tuned so that changes in body volume produced nearly linear changes in sound amplitude. The plethysmograph was tested with a water filled balloon connected to a syringe pump. The volume of the balloon was varied as a triangle wave with an amplitude of 250 μL. The RMS error between measured and delivered volume was 4.43 μL. A volume step test, performed to assess the response time of the system, showed that the plethysmograph responded in less than one millisecond.
Starting Page	1494
Ending Page	1499
Page Count	6
File Format	PDF
ISSN	00906964
Journal	Annals of Biomedical Engineering
Volume Number	34
Issue Number	9
e-ISSN	15739686
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2006-08-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Helmholtz resonator Whole-body plethysmography Barometric plethysmography Gas compression
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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