Effects of volatile anesthetics on stiffness of mammalian ventricular muscle
| Autor: | Philippe R. Housmans, Victor Claes, Anna E. Bartunek |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
musculoskeletal diseases
Male animal structures Physiology Economics Heart Ventricles macromolecular substances In Vitro Techniques Sevoflurane Contractility Sociology Physiology (medical) medicine Carnivora Animals Isotonic Contraction Papillary muscle Isoflurane Chemistry Cardiac muscle technology industry and agriculture Ferrets Heart equipment and supplies Myocardial Contraction medicine.anatomical_structure Anesthesia Circulatory system Anesthetics Inhalation Calcium Human medicine Halothane Algorithms medicine.drug |
| Zdroj: | Journal of applied physiology Europe PubMed Central |
| ISSN: | 8750-7587 |
| Popis: | To assess the effects of halothane, isoflurane, and sevoflurane on cross bridges in intact cardiac muscle, electrically stimulated (0.25 Hz, 25°C) right ventricular ferret papillary muscles ( n = 14) were subjected to sinusoidal load oscillations (37–182 Hz, 0.2–0.5 mN peak to peak) at the instantaneous self-resonant frequency of the muscle-lever system. At resonance, stiffness is proportional to m ∗ ω2 (where m is equivalent moving mass and ω is angular frequency). Dynamic stiffness was derived by relating total stiffness to values of passive stiffness at each length during shortening and lengthening. Shortening amplitude and dynamic stiffness were decreased by halothane > isoflurane ≥ sevoflurane. At equal peak shortening, dynamic stiffness was higher in halothane or isoflurane in high extracellular Ca2+ concentration than in control. Halothane and isoflurane increased passive stiffness. The decrease in dynamic stiffness and shortening results in part from direct effects of volatile anesthetics at the level of cross bridges. The increase in passive stiffness caused by halothane and isoflurane may reflect an effect on weakly bound cross bridges and/or an effect on passive elastic elements. |
| Databáze: | OpenAIRE |
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