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- W1989855129 abstract "Objective A precise knowledge of the spread of botulinum toxin (BoNT) in muscle tissue is required to efficiently access endplate zones and increase BoNT's therapeutic efficacy. Here, we aimed to understand the spatiotemporal dynamics of BoNT distribution in skeletal muscle and its modulating factors, such as injected volume and exercise after injection. Methods To visualize distribution in muscle tissue, sagittal, dynamic, balanced fast field echo (BFFE) MRI imaging was performed during injection of 1 ml BoNT/NaCl bolus in spastic biceps brachii muscles (SBB, n = 4), and 1 ml NaCl in the right and 2 ml NaCl in the left healthy biceps brachii (HBB, n = 6), with or without successive muscle exercise. The pattern of extracellular fluid distribution was evaluated by T2-weighted and diffusion tensor imaging (DTI) sequences. Results BFFE indicated an immediate increase in hyperintensity, parallel to the muscle fibers, in the shape of a long (5.3 ± 1.7 cm) and thin (0.52 ± 1.3 cm) layer in HBB. The layer in SBB was shorter (3.25 ± 0.6 cm, p = 0.01) and tended to be thicker (0.74 ± 2.9 cm, p = 0.27). In HBB, an increase in volume (2 ml) resulted in an increase in thickness (0.95 ± 0.2 cm, p = 0.015), but a consistent length (5.67 ± 1.3 cm, p = 0.54). DTI visualized a change of diffusion, which exceeded the bolus region by approximately 0.5 cm. Redistribution occurred 10 min after injection and was more prominent in HBB, compared to SBB. Additional muscle activity did not alter the diffusion pattern or bolus distribution. Conclusion Injecting BoNT at different depths perpendicular to the direction of the muscle fiber might optimize the efficacy of BoNT treatment. Additional sites along muscle fibers should be considered in SBB." @default.
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- W1989855129 date "2014-09-01" @default.
- W1989855129 modified "2023-09-25" @default.
- W1989855129 title "Intramuscular distribution of botulinum toxin—Visualized by MRI" @default.
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- W1989855129 doi "https://doi.org/10.1016/j.jns.2014.06.028" @default.
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