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High-dose colforsin daropate increases diaphragmatic contractility in dogs
Yoshitaka Fujii1, Hidenori Toyooka
1Department of Anesthesiology, University of Tsukuba Institute of Clinical Medicine, Tsukuba City, Ibaraki, Japan. yfujii@igaku.tsukuba.ac.jp
Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|October 11, 2002
Summary
High-dose colforsin daropate significantly improved canine diaphragm contractility. Low-dose administration did not alter diaphragm function, suggesting a dose-dependent effect for this drug.
Area of Science:
- Veterinary Medicine
- Pharmacology
Background:
- Colforsin daropate is a water-soluble derivative known to enhance muscle contractility.
- Previous research suggests its potential in improving function in fatigued diaphragms.
Purpose of the Study:
- To investigate the effects of two different doses of colforsin daropate on the contractility of non-fatigued canine diaphragms.
- To determine if dose influences the drug's efficacy.
Main Methods:
- Twenty-four anesthetized dogs were divided into three groups.
- Groups received either a placebo, low-dose (0.2 µg/kg/min), or high-dose (0.5 µg/kg/min) of colforsin daropate.
- Diaphragmatic contractility was measured using transdiaphragmatic pressure (Pdi) at varying stimulation frequencies.
Main Results:
- High-dose colforsin daropate significantly increased Pdi at both 20 Hz and 100 Hz stimulation frequencies compared to baseline and placebo (P < 0.05).
- Low-dose colforsin daropate did not result in significant changes in Pdi.
Conclusions:
- Colforsin daropate enhances canine diaphragm contractility, but only at a high dose.
- The study indicates a dose-dependent effect of colforsin daropate on non-fatigued diaphragmatic muscle function.