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首页> 外文期刊>American Journal of Veterinary Research >Evaluation of the renin-angiotensin system in cardiac tissues of cats with pressure-overload cardiac hypertrophy.
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Evaluation of the renin-angiotensin system in cardiac tissues of cats with pressure-overload cardiac hypertrophy.

机译:压力超负荷心肌肥大猫的心脏组织中肾素-血管紧张素系统的评估。

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摘要

OBJECTIVE: To clarify regulation of the renin-angiotensin (RA) system in cardiac tissues by measuring angiotensin-converting enzyme (ACE) and chymase activities in cats with pressure-overload cardiac hypertrophy. ANIMALS: 13 adult cats. PROCEDURES: Pressure-overload cardiac hypertrophy was induced by coarctation of the base of the ascending aorta in 6 cats, and 7 cats served as untreated control animals. Cats were examined before and 3 months and 2 years after surgery. Two years after surgery, cardiac hypertrophy was confirmed by echocardiography, and the blood pressure gradient was measured at the site of constriction. Cats were euthanized, and ACE and chymase activities were measured in cardiac tissues. RESULTS: Mean +/- SD pressure gradient across the aortic constriction was 63 +/- 6 mm Hg. Chymase activity predominated (75% to 85%) in the RA system of the cardiac tissues of cats. Fibrosis in the wall of the left ventricle was detected in cats with hypertrophy, and fibrosis of the papillary muscle was particularly evident. CONCLUSIONS AND CLINICAL RELEVANCE: Chronic pressure overload on the heart of cats can activate the RA system in cardiac tissues. A local increase in angiotensin II was one of the factors that sustained myocardial remodeling.
机译:目的:通过测量压力超负荷的心肌肥大猫的血管紧张素转换酶(ACE)和糜酶活性,阐明对心脏组织中肾素-血管紧张素(RA)系统的调节作用。动物:13只成年猫。程序:6只猫的升主动脉基部缩窄,导致压力超负荷的心肌肥大,其中7只作为未治疗的对照动物。在手术前,手术后3个月和2年检查猫。手术两年后,通过超声心动图检查确认了心脏肥大,并在狭窄部位测量了血压梯度。对猫实施安乐死,并测量心脏组织中的ACE和糜酶活性。结果:主动脉缩窄处的平均+/- SD压力梯度为63 +/- 6 mm Hg。在猫的心脏组织的RA系统中,糜蛋白酶的活性占主导(75%至85%)。在肥大猫中检测到左心室壁纤维化,尤其是乳头肌纤维化。结论和临床意义:猫心脏的慢性压力超负荷可激活心脏组织中的RA系统。局部血管紧张素II升高是维持心肌重塑的因素之一。

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