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The role of ultrasound operation mode for safely interfering in the heart rate

机译:超声操作模式对心率安全干扰的作用

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Diagnostic ultrasound applies low intensity acoustic waves to noninvasively investigate biological tissues. Higher intensities can alter tissue characteristics, and this is of interest for therapeutic ultrasound, when the occurrence of bioeffects is — to a certain extent — desirable for tissue healing. Relative to cardiology, diagnostic ultrasound is well established, whereas there is an unexplored potential for therapeutic applications. Ultrasound is an alternative source of energy that has different characteristics when compared to electrical energy and so its interference in the cardiac activity might be useful for treating arrhythmias. The objective of this study is to investigate the role of operation mode (continuous / pulsed ultrasound) for interfering in the heart rate without damaging the tissue. Nine Sprague-Dawley rats were anesthetized with isoflurane and exposed to high-intensity, 1MHz ultrasound. One animal was submitted to continuous wave application, which produced thermal damage. Two groups of four animals were submitted to different pulsed schemes (single / variable pulse repetition frequency). Post-therapy values were divided by pre-therapy values, resulting in normalized values for heart rate and respiratory rate. These values were compared between both pulsed schemes, resulting in a statistically significant difference (p<0.05) only for the heart rate. When comparing the post-therapy and pre-therapy absolute values within the variable pulse repetition rate group, there was a heart rate drop (p<0.05), whereas there was no significant effect on the ejection fraction and end diastolic volume, meaning that no major damage was produced. The insonification scheme used in this study excludes temperature effects, so the observed effect results from nonthermal mechanisms, possibly from radiation force.
机译:诊断超声波将低强度声波应用于非侵入性研究生物组织。更高的强度可以改变组织特征,并且治疗超声感兴趣,当生物效应的发生是 - 在一定程度上 - 希望组织愈合。相对于心脏病学,诊断超声是很好的,而对治疗应用有未探明的潜力。超声是与电能相比具有不同特性的替代能源来源,因此其在心脏活性的干扰可能对治疗心律失常有用。本研究的目的是探讨操作模式(连续/脉冲超声)对心率干扰而不会损坏组织的作用。用异氟醚麻醉九种Sprague-Dawley大鼠,暴露于高强度,1MHz超声波。一只动物被提交到连续波应用,这产生了热损坏。两组四组动物被提交到不同的脉冲方案(单/可变脉冲重复频率)。治疗后值除以治疗价值,导致心率和呼吸率的标准化值。在两个脉冲方案之间比较这些值,导致统计学上显着的差异(P&#x003c; 0.05)仅为心率。在可变脉冲重复率组内比较治疗后和预治疗绝对值时,存在心率下降(P&#x003c; 0.05),而对喷射分数和最终舒张性体积没有显着影响,意思没有产生重大损害。本研究中使用的钝化方案排除了温度效应,因此观察到的效果是由非热机制产生的,可能来自辐射力。

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