High-Intensity focused ultrasound ablation of myocardium in vivo and instantaneous biological response

Minjuan Zheng, Weihui Shentu, Dingzhang Chen, David J. Sahn, Xiaodong Zhou

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Objective: This study aimed to evaluate the instantaneous biological response of canine myocardium in vivo to high-intensity focused ultrasound (HIFU) ablation, and thereby determine the feasibility of this method. Methods: Left ventricle myocardium HIFU ablation was performed on six dogs at four levels of HIFU energy (acoustic intensity was 3000 W/cm2; ablation durations were 1.2, 2.4, 3.6, and 4.8 sec, respectively). Gross lesion volumes were confirmed and assessed by tetrazolium chloride (TTC) staining, hematoxylin-eosin (HE) staining, and electron microscopy. Global cardiac function and focal wall motion were evaluated by echocardiography. Blood enzymes and cardiac troponin T (CTnT) were tested after ablation. HIFU ablation was repeated on another set of six fresh canine hearts in vitro at the same four energy levels. Focal maximum temperatures were detected both in vivo and in vitro. Results: Different sizes of ablation via HIFU can be created in beating hearts using controlled energy emission. Focal maximum temperatures varied from 62 ± 4.8°C to 81 ± 12.9°C. The lesion sizes were significantly smaller in vivo than in vitro, as verified by TTC and HE staining. Focal wall motion immediately decreased after ablation (P < 0.05), although the ejection fraction (EF) and E/A ratio were unchanged (P > 0.05). Enzymes and CTnT immediately increased. Conclusion: HIFU can be used for the controllable ablation of myocardial tissue, with instantly increased serum markers, decreased regional wall motion, and unaffected left ventricular global function. (Echocardiography 2014;31:1146-1153).

Original languageEnglish (US)
Pages (from-to)1146-1153
Number of pages8
JournalEchocardiography
Volume31
Issue number9
DOIs
StatePublished - Jan 1 2014

Keywords

  • Cardiac ablation
  • Echocardiography
  • High-intensity focused ultrasound

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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