The Characteristics of ECG Before Death of Crabs
| Autor: | Ping-Jung Chu, 朱炳融 |
|---|---|
| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 This study analyzed the heart rate and cardiac arrest interval in the overall duration (from performed the implantation to the death of the crab) of ECG recording on Scylla serrata. During the period of recording, the animals was kept in a handmade chest which equipments webcam, sensors for temperature and decibel, auto-feeding and auto-turning on/off light periodically. To distinguish between bradycardia and cardiac arrest, we analyzed all the cardiac pause from an animal in initial 3 hour and 4 hour before death. We found that the pause duration less than 2 second is much more than the ones greater than 2 second, so we defined the event of pause duration greater than 2 second is “cardiac arrest”, and the cardiac arrest could further be divided into two groups, long and short duration, according to the pause distribution. Our results demonstrated that the heart rate suddenly decreased at 3 hours before death. The ratio of number of short/long cardiac arrest duration times was high at the initial stage after implantation, and the ratio went lower at medium stage of recording. The ratio reverse could be observed at 24 hours before death. We suggested that the ratio of number of short/long cardiac arrest duration times could be an index of animal’s health status. We further developed a new implantation method which could achieve long-term ECG recording in crab. By this method, the S/N ratio also kept at the level of 4.64 after 275 recording hours, and the crab lived 50 days from implantation. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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