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Hydrodynamic Resistance of Intracranial Flow-Diverter Stents: Measurement Description and Data Evaluation
AbstractPurposeIntracranial aneurysms are malformations forming bulges on the walls of brain arteries. A flow diverter device is a fine braided wire structure used for the endovascular treatment of brain aneurysms. This work presents a rig and a protocol for the measurement of the hydrodynamic resistance of flow diverter stents. Hydrodynamic resistance is interpreted here as the pressure loss versus volumetric flow rate function through the mesh structure. The difficulty of the measurement is the very low flow rate range and the extreme sensitivity to contamination and disturbances.MethodsRigorous attention was paid to rep...
Source: Cardiovascular Engineering and Technology - December 2, 2019 Category: Cardiology Source Type: research

Cardiac Output Monitoring in Children, Adolescents and Adults Based on Pulse Contour Analysis: Comparison with Echocardiography-Derived Data and Identification of Factors Associated with Their Differences
ConclusionCO(PCA) had systematic (<  0.17 L/min) and percent (≤ 30%) errors, which allow us to postulate that its use allows reaching levels comparable to those of echocardiography. Differences in CO-data between methods were associated with arterial and cardiac properties. (Source: Cardiovascular Engineering and Technology)
Source: Cardiovascular Engineering and Technology - November 26, 2019 Category: Cardiology Source Type: research

Balloon Aortic Valvuloplasty Using a Non-Occlusive Balloon Catheter: First Animal Experience
ConclusionsThe novel non-occlusive balloon catheter, which permitted uninterrupted cardiac output for a prolonged period without the need for pacing-induced temporary cessation of cardiac output, is both feasible and well tolerated in the acute sheep model. (Source: Cardiovascular Engineering and Technology)
Source: Cardiovascular Engineering and Technology - November 17, 2019 Category: Cardiology Source Type: research

Effects of Normal Variation in the Rotational Position of the Aortic Root on Hemodynamics and Tissue Biomechanics of the Thoracic Aorta
ConclusionA clockwise rotational position of the aortic root imparts an increased wall shear stress at the sinutubular junction and proximal ascending aorta in comparison to other root rotation positions. This may pose increased risk for dilation of the sinutubular junction and ascending aorta in the patient with a clockwise positioned aortic root compared to other normal positional configurations. (Source: Cardiovascular Engineering and Technology)
Source: Cardiovascular Engineering and Technology - November 6, 2019 Category: Cardiology Source Type: research

A New Approach Based on a Multiobjective Evolutionary Algorithm for Accurate Control of Flow Rate and Blood Pressure in Cardiac Bioreactors
ConclusionThe strong non-linear interaction that exists between the three controlled variables makes it difficult to obtain a precise control of any of these, let alone all three simultaneously. However, the results showed that this new control algorithm can efficiently overcome such difficulties. In the particular field of bioreactors reproducing the cardiovascular environment, such a flexible, versatile and accurate reproduction of these three interdependent controlled variables is unprecedented. (Source: Cardiovascular Engineering and Technology)
Source: Cardiovascular Engineering and Technology - October 29, 2019 Category: Cardiology Source Type: research