Myocardial electrical conduction blockade time dominated by irradiance on photodynamic reaction: in vitro and in silico study

Emiyu Ogawa; Tsunenori Arai

doi:10.1117/12.2289319

13 February 2018 Myocardial electrical conduction blockade time dominated by irradiance on photodynamic reaction: in vitro and in silico study

Emiyu Ogawa, Tsunenori Arai

Author Affiliations +

Proceedings Volume 10492, Optical Interactions with Tissue and Cells XXIX; 104920E (2018) https://doi.org/10.1117/12.2289319
Event: SPIE BiOS, 2018, San Francisco, California, United States

Abstract

The time for electrical conduction blockade induced by a photodynamic reaction was studied on a myocardial cell wire in vitro and an in silico simulation model was constructed to understand the necessary time for electrical conduction blockade for the wire. Vulnerable state of the cells on a laser interaction would be an unstable and undesirable state since the cells might progress to completely damaged or repaired to change significantly therapeutic effect. So that in silico model, which can calculate the vulnerable cell state, is needed. Understanding an immediate electrical conduction blockade is needed for our proposed new methodology for tachyarrhythmia catheter ablation applying a photodynamic reaction. We studied the electrical conduction blockade occurrence on the electrical conduction wire made of cultured myocardial cells in a line shape and constructed in silico model based on this experimental data. The intracellular Ca²⁺ ion concentrations were obtained using Fluo-4 AM dye under a confocal laser microscope. A cross-correlation function was used for the electrical conduction blockade judgment. The photodynamic reaction was performed under the confocal microscopy with 3-120 mW/cm² in irradiance by the diode laser with 663 nm in wavelength. We obtained that the time for the electrical conduction blockade decreased with the irradiance increasing. We constructed a simulation model composed of three states; living cells, vulnerable cells, and blocked cells, using the obtained experimental data and we found the rate constant by an optimization using a conjugate gradient method.

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Emiyu Ogawa and Tsunenori Arai "Myocardial electrical conduction blockade time dominated by irradiance on photodynamic reaction: in vitro and in silico study", Proc. SPIE 10492, Optical Interactions with Tissue and Cells XXIX, 104920E (13 February 2018); https://doi.org/10.1117/12.2289319

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KEYWORDS

Data modeling

In vitro testing

Calcium

Confocal microscopy

Microscopes

Optimization (mathematics)

Sodium

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