Echographical assessment of the early stage of experimental atherosclerosis of the descending aorta in rabbits
| Autor: | Yoichi Toma, Yasuaki Tomochika, Masunori Matsuzaki, Seiji Umemoto, Mitsuyuki Hiromoto |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Male
Pathology medicine.medical_specialty Normal diet Physiology Arteriosclerosis chemistry.chemical_compound medicine.artery Intravascular ultrasound medicine Animals Stage (cooking) Ultrasonography Lagomorpha biology medicine.diagnostic_test business.industry Cholesterol Anatomy biology.organism_classification medicine.anatomical_structure chemistry Descending aorta Aortic pressure Diet Atherogenic Rabbits Cardiology and Cardiovascular Medicine business Tunica Intima Tunica Media Artery |
| Zdroj: | Japanese circulation journal. 60(9) |
| ISSN: | 0047-1828 |
| Popis: | To assess the early stage of atherosclerosis of the thoracic descending aorta, we evaluated morphological atheromatous lesions (atherosis) and the stiffness parameter of the artery (beta; sclerosis) in 24 male rabbits using echography. Male Japanese white rabbits weighing 2.5-3.0 kg were fed a diet containing 1% cholesterol for 7 (n = 8) or 14 weeks (n = 8). Rabbits fed a normal diet were used as controls (n = 8). Atheromatous lesions were evaluated with intravascular ultrasound (IVUS: Aloka, 20 MHz, 6F). We also calculated beta using M-mode echography (7.5 or 10 MHz) and direct aortic pressure measurement. Thickening of the intima-media complex was clearly observed with IVUS in the 14-week group but was not detected in the others. Histologically, only a thin layer of foamy cells on the intima (thickness < 20 microns) was observed in the 7-week group. The value of beta was significantly increased in both the 7-week (4.7 +/- 2.2) and 14-week groups (4.5 +/- 0.8) compared with controls (1.7 +/- 0.9, both p < 0.01). These results suggest that the development of atherosis might be preceded by vascular sclerosis during the early stage of atherosclerosis when the serum cholesterol level is high: at a time when the thin layer of foamy cells could not be detected by conventional IVUS. |
| Databáze: | OpenAIRE |
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