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首页> 外文期刊>Ultrasound in Medicine and Biology >In vitro evaluation of dual mode ultrasonic thrombolysis method for transcranial application with an occlusive thrombosis model.
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In vitro evaluation of dual mode ultrasonic thrombolysis method for transcranial application with an occlusive thrombosis model.

机译:闭塞性血栓形成模型的经颅应用双模式超声溶栓方法的体外评估。

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A recent clinical trial of transcranial low-frequency ultrasound-mediated tPA thrombolysis (LFUT) showed cerebral hemorrhages associated with high spatial peak pulse average intensity (I(SPPA)), wide beam and long pulse duration. We developed an alternative approach to LFUT wherein diagnostic power M-mode Doppler (PMD) ultrasound is combined with LFUT, with a goal of increased safety. The effectiveness of such a dual mode ultrasonic thrombolysis (DMUT) was explored in vitro. The DMUT system emitted PMD (2 MHz) and LFUT (550 kHz) beams in alternating fashion from a small 12 mm diameter probe. The LFUT had a low I(SPPA) (2 W/cm(2)) and a short pulse duration (55 micros). Occlusive clots made in plastic tips from bovine plasma and thrombin were placed in flow models pressurized to 800 mH(2)O, with 600 IU/mL monteplase injected upstream. Recanalization times were then compared among three groups: the control (monteplase alone), PMD (monteplase + PMD) and DMUT (monteplase + PMD + LFUT). The capability of the DMUT device to monitor recanalization was demonstrated by observing with Doppler the degree of flow of a blood-mimicking fluid in the vicinity of the clot. Recanalization times were 37.9 +/- 22.9, 38.9 +/- 12.4 and 18.5 +/- 8.0 min, respectively, for the control, PMD and DMUT. There were significant differences between DMUT and the control (p = 0.0004) and between DMUT and PMD (p = 0.0004). Recanalization flows were clearly detected. It is anticipated that this DMUT method presents a safer and more efficient approach than normal LFUT.
机译:最近的经颅低频超声介导的tPA溶栓(LFUT)临床试验表明,脑出血与高空间峰值脉冲平均强度(I(SPPA)),宽束和长脉冲持续时间有关。我们开发了LFUT的替代方法,其中将诊断功率M型多普勒(PMD)超声与LFUT结合使用,旨在提高安全性。在体外探索了这种双模式超声溶栓(DMUT)的有效性。 DMUT系统以交替方式从直径为12 mm的小探头发出PMD(2 MHz)和LFUT(550 kHz)光束。 LFUT具有较低的I(SPPA)(2 W / cm(2))和较短的脉冲持续时间(55 micros)。用牛血浆和凝血酶的塑料尖端制成的闭塞血块置于加压至800 mH(2)O的流动模型中,向上游注入600 IU / mL的替普酶。然后在三组之间比较再通时间:对照组(仅蒙太普酶),PMD(蒙太普酶+ PMD)和DMUT(蒙太普酶+ PMD + LFUT)。通过用多普勒观察血凝块附近模仿血液的流体的流动程度,证明了DMUT设备监测再通的能力。对照,PMD和DMUT的再通时间分别为37.9 +/- 22.9、38.9 +/- 12.4和18.5 +/- 8.0分钟。 DMUT和对照之间(p = 0.0004)以及DMUT和PMD之间(p = 0.0004)有显着差异。明显检测到再通流量。可以预期,这种DMUT方法比普通的LFUT提供了一种更安全,更有效的方法。

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