Acoustic Activation Imaging With Intravenous Perfluoropropane Nanodroplets Results in Selective Bioactivation of the Risk Area

Shouqiang Li, Cheng Chen, John Lof, Elizabeth A. Stolze, Jiri Sklenar, Xucai Chen, John J. Pacella, Flordeliza S. Villanueva, Terry O. Matsunaga, E. Carr Everbach, Stanley J. Radio, Sherry N. Westphal, Sruti Shiva, Feng Xie, Xiaoping Leng, Thomas R. Porter

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Acoustically activatable perfluoropropane droplets (PD) can be formulated from commercially available microbubble preparations. Diagnostic transthoracic ultrasound frequencies have resulted in acoustic activation (AA) predominately within myocardial infarct zones (IZ). Objective: We hypothesized that the AA area following acute coronary ischemia/reperfusion (I/R) would selectively enhance the developing scar zone, and target bioeffects specifically to this region. Methods: We administered intravenous PD in 36 rats and 20 pigs at various stages of myocardial scar formation (30 minutes, 1 day, and 7 days post I/R) to determine what effect infarct age had on the AA within the IZ. This was correlated with histology, myeloperoxidase activity, and tissue nitrite activity. Results: The degree of AA within the IZ in rats was not associated with collagen content, neutrophil infiltration, or infarct age. AA within 24 hours of I/R was associated with increased nitric oxide utilization selectively within the IZ (P <.05 compared with remote zone). The spatial extent of AA in pigs correlated with infarct size only when performed before sacrifice at 7 days (r =.74, P <.01). Conclusions: Acoustic activation of intravenous PD enhances the developing scar zone following I/R, and results in selective tissue nitric oxide utilization.

Original languageEnglish (US)
Pages (from-to)1063-1080
Number of pages18
JournalJournal of Ultrasound in Medicine
Volume43
Issue number6
DOIs
StateAccepted/In press - 2024

Keywords

  • acoustic activation
  • droplets
  • imaging
  • myocardial ischemia
  • perfluoropropane
  • reperfusion

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

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