[Measurement of differential values of inhaled volumes and exhaled volumes in mice].
To investigate the differential value of inhaled volume and exhaled volume in anesthesia mice, and its effect on the pressure change inside of plethysmograph.



Pressure and temperature in head chamber of double-chamber plethysmograph were tested when mice were placed in the body chamber. The differential values of inhaled volume and exhaled volume of mice were calculated.



The baseline pressure in head chamber increased with temperature rising within 12 minutes, then went down though temperature remained high. The inhaled volumes of 8 mice were (0.2842 + or - 0.0173)ml,and the differential value of inhaled volume and exhaled volume was (0.0012 + or - 0.0002)ml.



The inhaled volume is larger than exhaled volume, which makes pressure baseline of plethysmograph decreased. The differential value may be generated from respiratory quotient.
Xu
Wei-hua
WH
Department of Respiratory, Tongde Hospital of Zhejiang Province, Hangzhou 310012, China. xwhzju@163.com
D000818:Animals; D045853:Exhalation / Q000502:physiology*; D001239:Inhalation / Q000502:physiology*; D051379:Mice; D010991:Plethysmography; D011312:Pressure; D013696:Temperature; D013990:Tidal Volume; D014797:Vital Capacity / Q000502:physiology*