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• W2113148802 abstract "Voltage-sensitive fluorescent dyes have become a major tool in cardiac and neuro-electrophysiology. Achieving high signal-to-noise ratios requires increased illumination intensities, which may cause photobleaching and phototoxicity. The optimal range of illumination intensities varies for different dyes and must be evaluated individually. We evaluate two dyes: di-4-ANBDQBS (excitation 660 nm) and di-4-ANEPPS (excitation 532 nm) in the guinea pig heart. The light intensity varies from 0.1 to 5 mW/mm 2 , with the upper limit at 5 to 10 times above values reported in the literature. The duration of illumination was 60 s, which in guinea pigs corresponds to 300 beats at a normal heart rate. Within the identified duration and intensity range, neither dye shows significant photobleaching or detectable phototoxic effects. However, light absorption at higher intensities causes noticeable tissue heating, which affects the electrophysiological parameters. The most pronounced effect is a shortening of the action potential duration, which, in the case of 532-nm excitation, can reach ∼30% . At 660-nm excitation, the effect is ∼10% . These findings may have important implications for the design of optical mapping protocols in biomedical applications." @default.
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• W2113148802 date "2012-09-06" @default.
• W2113148802 modified "2023-10-18" @default.
• W2113148802 title "Optical mapping at increased illumination intensities" @default.
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• W2113148802 doi "https://doi.org/10.1117/1.jbo.17.9.096007" @default.
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