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Background: This study aimed to evaluate the multiple interactions between therapeutic ultrasound (TUS), microbubbles (MB), and recombinant tissue plasminogen activator (r-tPA) by using three-dimensional (3D) ultrasound to examine the impact of thrombolysis with r-tPA on epicardial recanalization and microcirculation in patients with acute ST-segment-elevation myocardial infarction (STEMI).
Methods: Acute thrombotic occlusion of the left anterior descending (LAD) artery was induced in 32 Bama pigs, who were fed a high-cholesterol diet and randomized into four groups: (I) a 3D-sono-assisted-thrombolysis (3D/TUS + MB + r-tPA) group; (II) a 3D/TUS + MB group; (III) a full-dose r-tPA group; and (IV) a 3D/TUS alone group. Epicardial angiographic recanalization rate, microcirculation in the at-risk myocardium, ST-segment elevation on electrocardiogram, and changes in the at-risk myocardium and the myocardial infarct area were compared between the groups.
Results: After treatment, distal LAD recanalization was observed in 87.5% (7/8) of pigs in the 3D/TUS + MB + r-tPA group, which was significantly higher than the rates observed in the 3D/TUS + MB (37.5%) and the full-dose r-tPA (50.0%) groups (all P<0.05). The average acoustic intensity in the 3D/TUS + MB + r-tPA group (193.78±10.15 dB) was also significantly higher than that in the 3D/TUS + MB (154.29±31.94 dB) and the r-tPA (141.42±28.31 dB) groups (all P<0.05). The decrease in ST-segment elevation in the 3D/TUS + MB + r-tPA group (1.31±1.22 mm) was significantly higher than that in the 3D/TUS + MB (5.38±1.77 mm) and the r-tPA (4.30±2.08 mm) groups (all P<0.05). Furthermore, the ratio of the infarcted myocardial area divided by the at-risk myocardial area was markedly lower in the 3D/TUS + MB + r-tPA group (0.51±0.14) than in the 3D/TUS + MB (0.69±0.28) and r-tPA (0.75±0.23) groups (all P<0.05).
Conclusions: Three-dimensional sono-assisted-thrombolysis directly improves infarct-related recanalization rates, enhances microcirculation, reduces r-tPA dosage, and ameliorates the thrombolytic effect of r-tPA in acute STEMI.
Download full-text PDF |
Source |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9511427 | PMC |
http://dx.doi.org/10.21037/qims-21-1247 | DOI Listing |
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