TY - JOUR
T1 - Assessment of Ischemia-Induced Microvascular Remodeling Using Contrast-Enhanced Ultrasound Vascular Anatomic Mapping
AU - Pascotto, Marco
AU - Leong-Poi, Howard
AU - Kaufmann, Beat
AU - Allrogen, Achim
AU - Charalampidis, Dimitrios
AU - Kerut, Edmund K.
AU - Kaul, Sanjiv
AU - Lindner, Jonathan R.
N1 - Funding Information:
Supported by grants (R01-HL-074443, R01-HL-078610 and R01-DK-063508) to Dr. Lindner and (R01-EB-002069) to Dr. Kaul from the National Institutes of Health, Bethesda, Maryland. Dr. Leong-Poi was supported by a Research Fellowship Award from the Canadian Institutes of Health Research and the Heart and Stroke Foundation of Canada, Ottawa, Canada. Dr. Kaufmann is supported by research grants from the Swiss National Science Foundation.
PY - 2007/9
Y1 - 2007/9
N2 - Our aim was to apply novel contrast-enhanced ultrasound (CEU) techniques to characterize remodeling in different vascular compartments during ischemia-mediated angiogenesis. Hind limb ischemia was produced by ligation of an external iliac artery in 60 rats, half of which were treated with intramuscular fibroblast growth factor (FGF)-2 (5 μg). The proximal adductor muscles of the ischemic and control hind limb were studied immediately after ligation and at days 4, 7, or 14. Low-power maximum intensity projection imaging was performed to assess large intramuscular vessels to the fourth branch order. CEU data were analyzed to measure capillary perfusion and functional noncapillary microvascular blood volume. Resting capillary perfusion was reduced by 30% after arterial ligation and recovered earlier in FGF-2-treated versus nontreated rats (day 4 vs. 14). Changes in perfusion were temporally related to expansion of noncapillary microvascular blood volume on CEU, which was associated with an arteriogenic response on histology. Expansion of and organization (fractal distribution) of large collateral vessels occurred gradually over 2 weeks and was slightly more rapid with FGF-2 treatment. We conclude that CEU can separately assess collateral development, more distal arteriogenesis, and secondary changes in capillary perfusion that occur differentially with ischemia and growth factor therapy.
AB - Our aim was to apply novel contrast-enhanced ultrasound (CEU) techniques to characterize remodeling in different vascular compartments during ischemia-mediated angiogenesis. Hind limb ischemia was produced by ligation of an external iliac artery in 60 rats, half of which were treated with intramuscular fibroblast growth factor (FGF)-2 (5 μg). The proximal adductor muscles of the ischemic and control hind limb were studied immediately after ligation and at days 4, 7, or 14. Low-power maximum intensity projection imaging was performed to assess large intramuscular vessels to the fourth branch order. CEU data were analyzed to measure capillary perfusion and functional noncapillary microvascular blood volume. Resting capillary perfusion was reduced by 30% after arterial ligation and recovered earlier in FGF-2-treated versus nontreated rats (day 4 vs. 14). Changes in perfusion were temporally related to expansion of noncapillary microvascular blood volume on CEU, which was associated with an arteriogenic response on histology. Expansion of and organization (fractal distribution) of large collateral vessels occurred gradually over 2 weeks and was slightly more rapid with FGF-2 treatment. We conclude that CEU can separately assess collateral development, more distal arteriogenesis, and secondary changes in capillary perfusion that occur differentially with ischemia and growth factor therapy.
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U2 - 10.1016/j.echo.2007.02.016
DO - 10.1016/j.echo.2007.02.016
M3 - Article
C2 - 17566703
AN - SCOPUS:34548269646
SN - 0894-7317
VL - 20
SP - 1100
EP - 1108
JO - Journal of the American Society of Echocardiography
JF - Journal of the American Society of Echocardiography
IS - 9
ER -