||Use of Carbon Dioxide Challenge to Detect Toxicant - Induced Changes in Cardiopulmonary Function of Awake Rats.
Tepper, J. S. ;
Wiester, M. J. ;
King, M. E. ;
Weber, M. F. ;
Costa., D. L. ;
||Health Effects Research Lab., Research Triangle Park, NC. Toxicology Branch. ;Northrop Services, Inc., Research Triangle Park, NC.
Carbon dioxide ;
Heart function tests ;
Respiratory function tests ;
Air pollution effects(Animals) ;
Computer applications ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||A system has been developed to measure simulatneously the effects of inhaled toxicants on cardiopulmonary function in four awake rats before, during and after exposure. One day prior to testing, Fischer-344 and Sprague-Dawley rats were implanted with an intrapleural or carotid catheter. On the day of testing, the rats were placed into a restraint system to reduce movement artifacts and to keep rats from disturbing the implanted catheters without imposing limitations on functional measurements. The rats were then sealed into constant-volume plethysmographs mounted on the door of a 0.32-cu m Rochester exposure chamber. Thirty minutes after the rats were placed into the plethysmographs, control measurements were obtained. Under the control of a digital computer, the rats were exposed for 15-min periods to 4% CO2. During testing, tidal volume, intrapleural pressure, blood pressure, and the electrocardiogram were recorded on the polygraph, and were digitized and stored in the computer. Four-second breathing epochs were recorded and analyzed, and the results were displayed on line.
||Inhalation Toxicology, Premier Issue, p79-95, Oct 88. Prepared in cooperation with Northrop Services, Inc., Research Triangle Park, NC.
|NTIS Title Notes
||Reprint: Use of Carbon Dioxide Challenge to Detect Toxicant - Induced Changes in Cardiopulmonary Function of Awake Rats.
||57Y; 57S; 68A
||PC A03/MF A01