Biomaterial Database

Monitoring guinea pig core temperature by telemetry during inhalation exposures. 1987

P S Thorne, and C P Yeske, and M H Karol

Department of Industrial Environmental Health Sciences, Graduate School of Public Health, University of Pittsburgh, Pennsylvania 15261.

A temperature telemetry system was incorporated into an existing animal model for inhalation toxicology. This system facilitated continuous monitoring of guinea pig temperature during inhalation exposures. Components of the system included Mini-Mitter temperature-controlled oscillators, AM receivers, and an IBM microcomputer. Software was developed to perform signal processing and filtering. Transmitters were calibrated and then sterilized and surgically implanted in the guinea pig peritoneum. Monitoring the baseline temperature of nine animals indicated a mean temperature of 38.6 +/- 0.3 degrees C. Guinea pigs were treated with agents to induce transient hypo- or hyperthermia. For the former, exposure for 3 hr to 7.8 ppm diphenylmethane-4,4'-diisocyanate resulted in a 3 degrees C temperature decrease. The temperature was determined from 230 readings per animal per hour. Inhalation of 9 or 44 micrograms/m3 endotoxin for 6 hr induced hyperthermia with a 1.5 degrees C maximum increase in core temperature at 4.8 hr. With endotoxin, an increase in respiratory rate was also noted and followed the same pattern as temperature with a maximal increase of 52% occurring at 4.2 hr. The temperature telemetry system enabled continuous long-term monitoring of toxicant-induced hypothermia and pyrexia without interruption of inhalation exposure or measurements of respiratory parameters.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008991	Monitoring, Physiologic	The continuous measurement of physiological processes, blood pressure, heart rate, renal output, reflexes, respiration, etc., in a patient or experimental animal; includes pharmacologic monitoring, the measurement of administered drugs or their metabolites in the blood, tissues, or urine.	Patient Monitoring,Monitoring, Physiological,Physiologic Monitoring,Monitoring, Patient,Physiological Monitoring
D001831	Body Temperature	The measure of the level of heat of a human or animal.	Organ Temperature,Body Temperatures,Organ Temperatures,Temperature, Body,Temperature, Organ,Temperatures, Body,Temperatures, Organ
D003485	Cyanates	Organic salts of cyanic acid containing the -OCN radical.	Cyanate
D004731	Endotoxins	Toxins closely associated with the living cytoplasm or cell wall of certain microorganisms, which do not readily diffuse into the culture medium, but are released upon lysis of the cells.	Endotoxin
D006168	Guinea Pigs	A common name used for the genus Cavia. The most common species is Cavia porcellus which is the domesticated guinea pig used for pets and biomedical research.	Cavia,Cavia porcellus,Guinea Pig,Pig, Guinea,Pigs, Guinea
D000280	Administration, Inhalation	The administration of drugs by the respiratory route. It includes insufflation into the respiratory tract.	Drug Administration, Inhalation,Drug Administration, Respiratory,Drug Aerosol Therapy,Inhalation Drug Administration,Inhalation of Drugs,Respiratory Drug Administration,Aerosol Drug Therapy,Aerosol Therapy, Drug,Drug Therapy, Aerosol,Inhalation Administration,Administration, Inhalation Drug,Administration, Respiratory Drug,Therapy, Aerosol Drug,Therapy, Drug Aerosol
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D013686	Telemetry	Transmission of the readings of instruments to a remote location by means of wires, radio waves, or other means. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)	Telemetries
D017953	Isocyanates	Organic compounds that contain the -NCO radical.	Isocyanate