Define aneurysm


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Article received on the 13th August Article accepted on the 27th August The clinical diagnosis is based on the development of a pulsating formation at the puncture site, presenting a con­tinuous murmur. Ultrasonographic diagnosis: — pseudoaneurysm appears as a well defined cavity whose content is define aneurysm anechogenic Figure 1. The shape and dimensions vary from one case to another, with the possibility of multiple si­mul­­ta­neous pseudoaneurysms.

Relevant information Relevant information about blood vessel flow Flow diverters are define aneurysm increasingly used to treat cerebral aneurysms, but flow diversion procedures remain challenging. Several authors have shown that the flow pattern inside aneurysms is considered one of the parameters that can be used to predict rupture and clotting. Relevant information about blood vessel flow Flow diverters are being increasingly used to treat cerebral aneurysms, but flow diversion procedures remain challenging. Expanding functional understanding Expanding functional understanding Currently, a combination of digital subtraction angiography DSA and three-dimensional rotational angiography 3DRA is the gold standard for imaging vascular lesions, but it provides limited functional information about flow.

The initial define aneurysm Do­ppler examination shows the red-blue filling pha­se, typical for aneurysms Figure 2. The spectral Do­ppler correspondent for this aspect is the low speed dual phase signal Figure 3.

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Most false aneu­r­ysms evolve towards thrombosis, develop­ing echogenic, nonhomogeneous content and loss of its Doppler signal. Figure 1.

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Post-coronarography inguinal pseudoaneurysm. The aspect is of a well-defined formation, with the predominance of anechogenic content.

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Discreet spontaneous contrast near the posterior wall. Figure 2.

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The Doppler color examination shows the bicolor filling, with a clear delimitation between the red and the blue zone. Figure 3.

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The Doppler signal define aneurysm the aneurysm is dual phase, with low speeds. During the systole the blood flows from the high pressure artery towards the low pressure pseudoaneurysm. During the diastole the pressure is higher in the pseudoaneurysm, whi­ch leads to a large back-flow to the artery Figure 4 and 5.

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Figure 4. Diagram showing the mechanism generating the Doppler signal from the pseudoaneurysm supply path.

These figures form the natural history against which the decision to treat and when to treat should be balanced. The risk of rebleeding is greater in patients in higher SAH grades, the gain of - surgical - treatment is inversely related to grade.

Figure 5.