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Sonazoid in Myocardial Perfusion Imaging — (SIMPI)  

Myocardial Ischemia Clinical Trial

Official title:
Study Examining if Sonazoid is an Effective Contrast Agent to Identify Myocardial Perfusion

Clinical Trial Summary

Currently, Sonazoid is mainly used for imaging liver lesions by assessing perfusion characteristics. However, the ultrasound technology is the same as for cardiac imaging and the stability of the microbubbles will potentially aid the detection of myocardial perfusion defects. This study will look at the feasibility of using sonozoid in this way.

Clinical Trial Description

Ultrasound contrast agents are gas-filled microbubbles that enhance the visualisation of cardiac structures, function and blood flow. Myocardial contrast echocardiography enables us to visualise myocardial perfusion and provides incremental information for diagnosis of coronary artery disease (CAD) and prognosis beyond wall motion assessment . Using ultrasound at low acoustic power (low/intermediate MI) causes the microbubbles to oscillate resulting in giving off non-linear signals which are different from tissues which gives off linear signals. The first contrast agents were used in 1968. Since then the technology has been refined and now the microbubbles are more stable and consist of an inert gas encapsulated in a lipid or albumin shell. These microbubbles remain intact in the systemic circulation because of their small size can transit through the pulmonary circulation. The indication for myocardial perfusion imaging is when vasodilator stress like Dipyridamole is performed. Vasodilators do not readily induce wall motion abnormalities but cause perfusion defects to occur which allows detection of CAD. Myocardial perfusion imaging is also indicated during treadmill or dobutamine stress when suspicion of CAD is high as it is more sensitive than wall motion for the detection of CAD. Myocardial perfusion imaging looks at a uniformity of contrast appearance in the myocardium, following a continuous microbubble infusion. If there is decreased perfusion, the appearance of contrast will be delayed and the opacification will not be uniform. The advantage of Sonazoid over the other frequently used contrast agents (Sonovue, Luminity, Optison) is that the microbubbles are more robust, allowing for a higher MI setting to be used during scanning. The higher MI setting enhances higher intensity bubble signal with improved spatial and temporal resolution which improves image quality and diagnostic accuracy. This study is not looking for diagnosis in patients, which will be done according to standard of care. It is to evaluate whether it is possible to assess myocardial perfusion using the contrast agent Sonazoid. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details
NCT number NCT05637333
Study type Observational
Source London North West Healthcare NHS Trust
Contact
Status Withdrawn
Phase
Start date December 15, 2022
Completion date May 15, 2023
View Details
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