Journal article
Relaxation effect of CGP-48506, EMD-57033, and dobutamine in ejecting and isovolumically beating rabbit hearts
American journal of physiology. Heart and circulatory physiology, Vol.273(6), pp.H2708-H2720
12/01/1997
Handle:
https://hdl.handle.net/2376/111624
PMID: 9435607
Abstract
Because it is not known whether ejection influences the negative effect of the Ca2+-sensitizing drugs on ventricular relaxation, we extended our previous analysis of stress-dependent relaxation in isovolumic beats to encompass ejecting beats and evaluated the relationships between both the time of onset of relaxation and the rate of relaxation and wall stress in a broader analysis framework. Furthermore, because the sites of action of the Ca2+-sensitizing drugs CGP-48506 and EMD-57033 may be different, and thus CGP-48506 may have fewer adverse effects on resting muscle length or force, we compared these two drugs to test the hypothesis that CGP-48506 would have less effect than EMD-57033 on relaxation in the isolated buffer-perfused rabbit heart. This analysis of stress-dependent relaxation in both ejecting and isovolumic beats readily differentiates between the negative lusitropic effect of 2 × 10−6 M EMD-57033, the negligible lusitropic effect of 6 × 10−6 M CGP-48506, and the positive lusitropic effect of 1.25 × 10−6 M dobutamine. Furthermore, comparison of the effect of the two Ca2+-sensitizing drugs in ejecting versus isovolumic contractions shows that CGP-48506 affects relaxation differently in ejecting contractions than it does in isovolumic contractions, whereas EMD-57033 affects relaxation similarly in both ejecting and isovolumic contractions.
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Details
- Title
- Relaxation effect of CGP-48506, EMD-57033, and dobutamine in ejecting and isovolumically beating rabbit hearts
- Creators
- Bryan K Slinker - Department of Veterinary and Comparative Anatomy, Pharmacology, and Physiology, Washington State University, Pullman, Washington 99164-6520Henry W Green - Department of Veterinary and Comparative Anatomy, Pharmacology, and Physiology, Washington State University, Pullman, Washington 99164-6520Yiming Wu - Department of Veterinary and Comparative Anatomy, Pharmacology, and Physiology, Washington State University, Pullman, Washington 99164-6520Robert D Kirkpatrick - Department of Veterinary and Comparative Anatomy, Pharmacology, and Physiology, Washington State University, Pullman, Washington 99164-6520Kenneth B Campbell - Department of Veterinary and Comparative Anatomy, Pharmacology, and Physiology, Washington State University, Pullman, Washington 99164-6520
- Publication Details
- American journal of physiology. Heart and circulatory physiology, Vol.273(6), pp.H2708-H2720
- Academic Unit
- Veterinary Medicine, College of; Integrative Physiology and Neuroscience, Department of
- Identifiers
- 99900547659601842
- Language
- English
- Resource Type
- Journal article