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At least 595 records · Page 33Linked to original sources
PubMed1996

[Development of a new telemetry recording system for measuring of gastrointestinal contractile activity in unrestrained and conscious small animals].

Myoelectrogram, strain gauge force transducer or manometry has been commonly used to record contractile activity of the gastrointestinal (GI) tract in small animals, but protecting the lead wires and tubes is troublesome when conducting experiments. To solve this problem, we have developed a new telementric recorder which can be implanted in the abdominal cavity of a small animal. The elemeter is a cylinder (phi 10 x 35 mm) with a strain gauge force transducer (4 x 3 mm) connected by fine lead wires. The telemeter includes a battery and amplification, transmission and power supply circuit to the transducer. The battery has a 1,500 hr life and is designed to be turned on and off from outside the body by means of a magnetic switch. The device weights 4 g and is waterproofed with silicon. Five male Wister rats weighing 300-400 g were used. Under general anesthesic, the force transducer was sutured onto the serosa in the gastric antrum, and the telemeter was fixed in the corner of the peritoneal cavity. During measurement, the rats were housed in individual cages under unrestrained conditions and the cage was placed on the receiver. Gastric motility could be continuously recorded for up to 60 days, although body movements sometimes affected the recordings slightly due to adhesion. There was no noticeable trouble related to the device implanted in the abdominal cavity. Gastric motility recorded with this telemeter was identical with that measured by other devices, and consisted of two different patterns, the fasted and fed patterns divided into two phases, as reported previously. In the fasted state, cyclic occurrence of intense contractions was observed, and regular phasic contractions were observed in the fed state. Bethanechol induced strong contractions and atropine inhibited contractile activity. The newly developed telemeter is a useful and reliable device to use in measuring GI motility in small animals.

Animals↗
PubMed1977

Studies of ambulance patients with ischemic heart disease. 11. Selection of patients for ambulance telemetry.

One hundred eighty-two of 1,928 patients (9.4 per cent) transported by ambulance during a six-month period in Baltimore had ECGs transmitted. Review of the remaining 1,746 records by two cardiologists indicated that an additional 113 patients should have had their ECGs transmitted because of life-threatening conditions. Of patients with acute ischemic heart disease, 47 had ECG monitoring and 24 did not. There were 22 per cent more Killip 111/1V patients with a 19 per cent higher mortality at three months among the "non-transmitted" patients as compared to the "transmitted" patients, controlling for all other relevant variables. Critical presentations inappropriately affect ambulance staffs' selection of patients for monitoring.

Aged↗
PubMed2006

Comparison of two methods of attaching telemetry transmitters to the Mekong giant catfish, Pangasianodon gigas.

For conservation and successful stock enhancement of endangered species, an understanding of the movement patterns and behavior of the target species is indispensable. The Mekong giant catfish, Pangasianodon gigas, is endemic to the Mekong Basin and now is threatened with extinction. Although biotelemetry using acoustic transmitters and receivers is expected to reveal its movement patterns and behavior, the most suitable attachment method for the transmitter to the catfish is unknown. In this study we examined the effects of external attachment and surgical implantation on the survival and growth of the catfish, compared with those in control individuals, in an earthen fish pond for approximately 2 months. No fish died during the experimental period. Furthermore, we found no fungal infections in any fish and no significant differences in growth rate among treatment and control fish. However, all transmitters of externally tagged fish were lost during the experimental period. In contrast, transmitters of some surgically implanted fish remained in the peritoneal cavity. In conclusion, the surgical implantation technique is suitable for long-term monitoring of the catfish.

Animals↗