Interactions between microbubbles and ultrasound: In vitro and in vivo observations

Kevin Wei, Danny M. Skyba, Christian Firschke, Ananda R. Jayaweera, Jonathan R. Lindner, Sanjiv Kaul

    Research output: Contribution to journalArticlepeer-review

    251 Scopus citations

    Abstract

    Objectives. We attempted to examine the interactions between ultrasound and microbubbles. Background. The interactions between microbubbles and ultrasound are poorly understood. We hypothesized that 1) ultrasound destroys microbubbles, and 2) this destruction can be minimized by limiting the exposure of microbubbles to ultrasound. Methods. We performed in vitro and in vivo experiments in which microbubbles were insonated at different frequencies, transmission powers and pulsing intervals. Video intensity decay was measured in vitro and confirmed by measurements of microbubble size and concentrations. Peak video intensity and mean microbubble myocardial transit rates were measured in vivo. Results. Imaging at lower frequencies and higher transmission powers resulted in more rapid video intensity decay (p = 0.01), and decreasing exposure of microbubbles to ultrasound minimized their destruction in vitro. Although these effects were also noted in vivo with venous injections of microbubbles, they were not seen with aortic root or direct coronary artery injections. Conclusions. Ultrasound results in microbubble destruction that is more evident at lower frequencies and higher acoustic powers. Reducing the exposure of microbubbles to ultrasound minimizes their destruction. This effect is most marked in vivo with venous rather than aortic or direct coronary injections of microbubbles. These findings could lead to effective strategies for myocardial perfusion imaging with venous injections of microbubbles.

    Original languageEnglish (US)
    Pages (from-to)1081-1088
    Number of pages8
    JournalJournal of the American College of Cardiology
    Volume29
    Issue number5
    DOIs
    StatePublished - Apr 1997

    ASJC Scopus subject areas

    • Cardiology and Cardiovascular Medicine

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