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| The application of shear wave elastography in the evaluation of type A botulinum toxin injection#br#
masseter for face-lift |
| DIAO Xue-hong, GUO Yu, CHEN Yue, JIN Jia-mei, CHEN Lu, ZHAN Jia |
| (Huadong Hospital, Fudan University, Shanghai 200040, China) |
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Abstract Objective: To assess the value of shear wave elastography(SWE) in the evaluation of type A botulinum toxin injection masseter for face-lift. Methods: 20 patients injected type A botulinum toxin in masseter. All the patients were examined by two-dimensional ultrasound and SWE. These two imagine methods measured the thickness and hardness of masseter under the relaxation state and forced occlusal status before injection, and after 1 week, 1 month, 3 months, 6 months. Result: Started 1 week after injection of type A botulinum toxin, the thickness and hardness of masseter muscle were decreased under both relaxation and occlusal condition. Those changes were obvious at 3 months, the mean reduction of relaxation masseter muscle thickness were 22.2%±4.2%, contraction thickness were 22.8%±5.3%, muscle strength was also significantly decreased, the mean reduction of relaxation strength were 19.5%±3.4%, contraction strength were 60.4%±5.8%, the thickness and hardness began to recover on 6 month. Conclusion: SWE and B-ultrasound could effectively reflect the reduction of muscle thickness and herdness after type A botulinum toxin injection. It could provide the best time and dose reference for the second injection.
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Received: 08 September 2016
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2017, Vol. 28 
