12 Key and Core Catalog With a mechanical key system, the level of security is determined by masterkey control. A masterkey system enables facilities of any size to manage the building by defining access by person and by area in increasing levels of complexity. Since BEST invented the standard for masterkey systems, there is no
When they occur in the upper part of the aorta, they are called thoracic aortic aneurysms. Aneurysms can occur anywhere in the thoracic aorta, including the ascending aorta near the heart, the aortic arch in the curve of the thoracic aorta and the descending aorta in the lower part of the thoracic aorta.
Aortic root dilatation at the sinuses of Valsalva is defined as an aortic root diameter above the upper limit of the 95% confidence interval of the distribution in a large reference population. In adults, a diameter of 2.1 cm/m2 has been considered the upper normal range in ascending aorta.Transthoracic echocardiography suffices to quantify maximum aortic root and proximal ascending aorta diameters when the acoustic window is adequate.orta size is related most strongly to body surface area and age. Therefore, body surface area may be used to predict aortic root diameter in several age intervals. Roman et al. considered three age strata: younger than 20 years, 20â40 years, and older than 40 years by published equations.