Faculty Collaboration Database

Angiogenesis is enhanced in ischemic canine myocardium by transmyocardial laser revascularization. J Am Coll Cardiol 1998 May;31(6):1426-33

Date

05/15/1998

Pubmed ID

9581745

DOI

10.1016/s0735-1097(98)00086-2

Scopus ID

2-s2.0-0032080944 (requires institutional sign-in at Scopus site)   151 Citations

Abstract

OBJECTIVES: This study sought to test whether transmyocardial laser revascularization (TMLR) stimulates angiogenesis in an animal model of chronic ischemia.

BACKGROUND: TMLR relieves angina and may also improve blood flow in patients who are not candidates for traditional therapies. The mechanisms of these benefits are not fully defined.

METHODS: Ischemia was created in 14 dogs by proximal left anterior descending coronary ameroid constrictors. TMLR was performed in the anterior wall (approximately 1 channel/cm2) of seven dogs; the remaining dogs served as the ischemic control group. Myocardial blood flow was measured (colored microspheres) at rest and during chemical stress (adenosine) in the acute setting and after 2 months.

RESULTS: TMLR did not influence blood flow in the acute setting. After 2 months, resting blood flow increased comparably in the anterior wall in both groups to approximately 80% of normal. However, the TMLR-treated dogs demonstrated an approximately 40% increase in blood flow capacity during stress in the ischemic territory compared with untreated dogs (left anterior descending coronary artery/left circumflex coronary artery flow 0.53+/-0.16 in the control group vs. 0.73+/-0.08 in TMLR animals, p < 0.05). Vascular proliferation, assessed by bromodeoxyuridine incorporation and proliferating cell nuclear antigen positivity in endothelial and smooth muscle cells was about four times greater in the TMLR group than in the control group (p < 0.001). The density of vessels with at least one smooth muscle cell layer was approximately 1.4 times greater in the myocardium surrounding the TMLR channel remnants than in control ischemic tissue (p < 0.001).

CONCLUSIONS: In this canine model of chronic ischemia, TMLR significantly enhances angiogenesis as evidenced by the increased number of vessels lined with smooth muscle cells, markedly increased vascular proliferation and increased blood flow capacity during stress.

Author List

Yamamoto N, Kohmoto T, Gu A, DeRosa C, Smith CR, Burkhoff D

Author

Takushi Kohmoto MD, PhD Professor in the Surgery department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Angioplasty, Balloon, Laser-Assisted
Animals
Coronary Circulation
Coronary Vessels
Disease Models, Animal
Dogs
Female
Male
Microspheres
Myocardial Ischemia
Myocardium
Neovascularization, Physiologic
Regional Blood Flow