Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
نویسندگان
چکیده
منابع مشابه
Simultaneous fluorometry and phosphorometry of Langendorff perfused rat heart: ex vivo animal studies.
Fluorescence imaging of intrinsic fluorophores of tissue is a powerful method to assess metabolic changes at the cellular and intracellular levels. At the same time, exogenous phosphorescent probes can be used to accurately measure intravascular tissue oxygenation. Heart failure is the leading cause of death in America. A rat heart can potentially model the human heart to study failures or othe...
متن کاملOptical mapping of Langendorff-perfused rat hearts.
Optical mapping of the cardiac surface with voltage-sensitive fluorescent dyes has become an important tool to investigate electrical excitation in experimental models that range in scale from cell cultures to whole-organs([1, 2]). Using state-of-the-art optical imaging systems, generation and propagation of action potentials during normal cardiac rhythm or throughout initiation and maintenance...
متن کاملRegional ischemia in hypertrophic Langendorff-perfused rat hearts.
Myocardial hypertrophy decreases the muscle mass-to-vascularization ratio, thereby changing myocardial perfusion. The effect of these changes on myocardial oxygenation in hypertrophic Langendorff-perfused rat hearts was measured using epimyocardial NADH videofluorimetry, whereby ischemic myocardium displays a high fluorescence intensity. Hypertrophic hearts, in contrast to control hearts, devel...
متن کاملVoltage-sensitive dye mapping in Langendorff-perfused rat hearts.
An imaging system suitable for recordings from Langendorff-perfused rat hearts using the voltage-sensitive dye 4-[beta-[2-(di-n-butylamino)-6-naphthyl]vinyl]pyridinium (di-4-ANEPPS) has been developed. Conduction velocity was measured under hyper- and hypokalemic conditions, as well as at physiological and reduced temperature. Elevation of extracellular [K(+)] to 9 mM from 5.9 mM caused a slowi...
متن کاملMultinuclear NMR studies of the Langendorff perfused rat heart.
The quantitation of intracellular sodium ion concentration [Na+]in perfused organs using NMR spectroscopy requires a knowledge of the extent of visibility of the 23Na resonance and of the intracellular volume of the organ. We have used a multinuclear NMR approach, in combination with the extracellular shift reagent dysprosium (III) tripolyphosphate, to determine the NMR visibility of intra- and...
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ژورنال
عنوان ژورنال: Journal of Visualized Experiments
سال: 2019
ISSN: 1940-087X
DOI: 10.3791/60472