Physics:Ultrasound-enhanced systemic thrombolysis

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Ultrasound-enhanced systemic thrombolysis
Other namesSonothrombolysis
SpecialtyRadiology, Neurology, Cardiology

Background

Ultrasound enhanced systemic thrombolysis (UEST), also known as sonothrombolysis, is a method that uses ultrasound waves to mechanically break the thrombi, or clots, using the vibration carried via soundwaves.[1] A large portion of initial research was conducted by Christy Holland, a Professor at the University Cincinnati and the Director of the University of Cincinnati Heart, Lung, and Vascular Institute, who also holds the patent for use of trans cranial ultrasound in stroke patients.[2] One of the main studies characterizing the use of UEST in the setting of acute stroke was the CLOTBUST Trial, which was published in 2004 in the Journal of Neuroimaging.[3] Since then, research with UEST has explored its use in other thrombotic scenarios such as pulmonary embolism and deep vein thrombosis. One major advantage of using ultrasound versus systemic thrombolysis is a reduced risk of bleeding, and improved heart function in the case of pulmonary embolism.[4]

Mechanism

UEST works by using ultrasound waves at different frequencies as an additional treatment that works with the conventional thrombolytics such as tissue plasminogen activator (tPA). Typically, frequencies are in the megahertz (MHz) range,[5] however, some studies suggest that there is no statistically significant difference in frequency use 2 MHz or <2 MHz in the setting of ischemic stroke.[6]

Various Uses

Ischemic stroke

Transcranial doppler ultrasound was first investigated in 2004, and demonstrated a significant clinical recovery through the use of sonothrombolysis with tPA, specifically through arterial recanalization.[3] Of note, it is important to first rule out hemorrhagic stroke prior to the initiation of thrombolysis. A meta-analysis conducted in 2020 investigating the safety and efficacy of sonothromoblysis in 5 randomized controlled trials demonstrated that there was overall benefit to using sonothrombolysis especially in the setting of a middle cerebral artery occlusion.[7]

Pulmonary Embolism

Another frequent condition that may require thrombolysis is a pulmonary embolism (PE), which is when a clot forms in a vein and travels to the lung vasculature, or forms directly in the lung vasculature. In certain patients with more severe forms of PE (massive or submassive), sonothrombolysis can improve cardiopulmonary function and reduce the bleeding risk that is accompanied by systemic thrombolysis.[8] Ultrasound has been shown to be more effective in reversing the damage to the right heart from strain due to the PE , and can help return the right heart to the appropriate size, when compared to just anticoagulation.[9]

Deep Vein Thrombosis

Studies examining the use of ultrasound enhanced thrombolysis for the treatment of deep vein thromboses (DVTs), or a clot located in the veins, are a bit more sparse, with only 1 randomized control trial up to 2018, and with many retrospective studies. A meta-analysis in 2018 looked at the efficacy of ultrasound and found that a large majority achieved significant thrombolysis, which they defined as >50% of the clot. The safety profile was also characterized in this study, and found that it was a relatively safe invasive procedure with only 1 death in 512 procedures and only 3.9% risk of significant bleeding.[10]

Cardiac Disease

The use of ultrasound in acute cardiac disease, such as a heart attack, is still in the early stages of investigation. However, recent data does demonstrate that in patients with an ST-segment elevation myocardial infarction, or STEMI, sonothrombolysis may improve flow within the impacted vessels allowing for better cardiac muscle oxygenation. The use of ultrasound was also shown to have improved left heart function several months after the acute event.[11]

Limitations and Future Directions

While there is a lot of promise in the use of sonothrombolysis, there are limitations at this time. For example, in the setting of ischemic stroke, patients with MCA territory stroke benefit the most. Moreover, the thickness of the temporal bone may also reduce efficacy of sonothrombolysis.[12] With regard to use in cardiac disease, the coronary arteries are much more difficult to visualize with ultrasound for several reasons including obstructions and movement of the arteries while the heart contracts and relaxes.[13]

As ultrasound technology advances, the applications continue to expand. For instance, the use of a mobile ultrasound that can pair to mobile devices could be used instead of a bulky machine, which could allow for increased access to the technology.[14] Additionally, as the technology advances, there could be potential for sonothrombolysis to replace conventional thrombolytics given its safer side-effect profile and good efficacy.

See also

References

  1. ↑ Bader, Kenneth B.; Gruber, Matthew J.; Holland, Christy K. (January 2015). "Shaken and Stirred: Mechanisms of Ultrasound-Enhanced Thrombolysis" (in en). Ultrasound in Medicine & Biology 41 (1): 187–196. doi:10.1016/j.ultrasmedbio.2014.08.018. PMID 25438846. 
  2. ↑ "Cardiovascular Insights | Ultrasound-Mediated Thrombolysis May Offer Promise | Cardiovascular Insights" (in en-US). 2015-08-10. https://www.uchealth.com/cardiovascular-insights/ultrasound-mediated-thrombolysis-may-offer-promise/. 
  3. ↑ 3.0 3.1 Alexandrov, Andrei V.; Wojner, Anne W.; Grotta, James C.; CLOTBUST Investigators (April 2004). "CLOTBUST: design of a randomized trial of ultrasound-enhanced thrombolysis for acute ischemic stroke". Journal of Neuroimaging 14 (2): 108–112. doi:10.1111/j.1552-6569.2004.tb00225.x. ISSN 1051-2284. PMID 15095554. https://pubmed.ncbi.nlm.nih.gov/15095554. 
  4. ↑ Stępniewski, Jakub; Kopeć, Grzegorz; Musiałek, Piotr; Magoń, Wojciech; Jonas, Kamil; Waligóra, Marcin; Sobczyk, Dorota; Podolec, Piotr (February 2021). "Hemodynamic Effects of Ultrasound-Assisted, Catheter-Directed, Very Low-Dose, Short-Time Duration Thrombolysis in Acute Intermediate–High Risk Pulmonary Embolism (from the EKOS-PL Study)" (in en). The American Journal of Cardiology 141: 133–139. doi:10.1016/j.amjcard.2020.11.004. PMID 33220318. https://linkinghub.elsevier.com/retrieve/pii/S0002914920312285. 
  5. ↑ Pfaffenberger, Stefan; Devcic-Kuhar, Branka; El-Rabadi, Karem; Gröschl, Martin; Speidl, Walter S.; Weiss, Thomas W.; Huber, Kurt; Benes, Ewald et al. (March 2003). "2MHz ultrasound enhances t-PA-mediated thrombolysis: comparison of continuous versus pulsed ultrasound and standing versus travelling acoustic waves". Thrombosis and Haemostasis 89 (3): 583–589. doi:10.1055/s-0037-1613390. ISSN 0340-6245. PMID 12624644. https://pubmed.ncbi.nlm.nih.gov/12624644/. 
  6. ↑ Zafar, Marium; Memon, Roha Saeed; Mussa, Muhammad; Merchant, Rameez; Khurshid, Aiman; Khosa, Faisal (August 2019). "Does the administration of sonothrombolysis along with tissue plasminogen activator improve outcomes in acute ischemic stroke? A systematic review and meta-analysis". Journal of Thrombosis and Thrombolysis 48 (2): 203–208. doi:10.1007/s11239-019-01899-6. ISSN 1573-742X. PMID 31214876. 
  7. ↑ Li, Xiaoqiang; Du, Hui; Song, Zhibin; Wang, Hui; Tan, Zhijian; Xiao, Mufang; Zhang, Fu (September 2020). "Efficacy and safety of sonothrombolysis in patients with acute ischemic stroke: A systematic review and meta-analysis" (in en). Journal of the Neurological Sciences 416: 116998. doi:10.1016/j.jns.2020.116998. PMID 32623143. 
  8. ↑ Pei, Dorothy T.; Liu, Jing; Yaqoob, Maidah; Ahmad, Waqas; Bandeali, Salman S.; Hamzeh, Ihab R.; Virani, Salim S.; Hira, Ravi S. et al. (2019-11-01). "Meta-Analysis of Catheter Directed Ultrasound-Assisted Thrombolysis in Pulmonary Embolism". The American Journal of Cardiology 124 (9): 1470–1477. doi:10.1016/j.amjcard.2019.07.040. ISSN 1879-1913. PMID 31492420. https://pubmed.ncbi.nlm.nih.gov/31492420. 
  9. ↑ Mangi, Muhammad A.; Rehman, Hiba; Bansal, Vikas; Zuberi, Omer (2017-07-19). "Ultrasound Assisted Catheter-Directed Thrombolysis of Acute Pulmonary Embolism: A Review of Current Literature". Cureus 9 (7): e1492. doi:10.7759/cureus.1492. ISSN 2168-8184. PMID 28944131. 
  10. ↑ Shi, Yadong; Shi, Wanyin; Chen, Liang; Gu, Jianping (April 2018). "A systematic review of ultrasound-accelerated catheter-directed thrombolysis in the treatment of deep vein thrombosis". Journal of Thrombosis and Thrombolysis 45 (3): 440–451. doi:10.1007/s11239-018-1629-y. ISSN 1573-742X. PMID 29417407. https://pubmed.ncbi.nlm.nih.gov/29417407/. 
  11. ↑ Porter, Thomas R.; Mathias, Wilson (2019-07-25). "Cardiovascular Sonothrombolysis". Current Cardiology Reports 21 (8): 86. doi:10.1007/s11886-019-1167-z. ISSN 1534-3170. PMID 31342183. https://pubmed.ncbi.nlm.nih.gov/31342183/. 
  12. ↑ Chen, Zhouqing; Xue, Tao; Huang, Huachen; Xu, Jiayi; Shankar, Sandhya; Yu, Hao; Wang, Zhong (2019-01-09). "Efficacy and safety of sonothombolysis versus non-sonothombolysis in patients with acute ischemic stroke: A meta-analysis of randomized controlled trials". PLOS ONE 14 (1): e0210516. doi:10.1371/journal.pone.0210516. ISSN 1932-6203. PMID 30625224. Bibcode: 2019PLoSO..1410516C. 
  13. ↑ Kaul, Sanjiv (2009-03-17). "Sonothrombolysis: a universally applicable and better way to treat acute myocardial infarction and stroke? Who is going to fund the research?". Circulation 119 (10): 1358–1360. doi:10.1161/CIRCULATIONAHA.108.846113. ISSN 1524-4539. PMID 19255337. 
  14. ↑ Zeldovich, Lina. "Handheld Ultrasound Devices Are Speeding Diagnosis of COVID-19" (in en). https://www.scientificamerican.com/article/handheld-ultrasound-devices-are-speeding-diagnosis-of-covid-19/. 



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