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Assessment of Cardiac Apex Kinematics Using a Real-Time 3D Magnetic Tracking System



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Assessment of Cardiac Apex Kinematics Using a Real Time 3D Magnetic Tracking System E Marcelli1 S Spolzino1 L Cercenelli1 A Cappello1 P Bagnoli2 ML Costantino2 N Malagutti2 R Fumero2 G Plicchi1 1 Universit di Bologna Bologna Italy 2 Politecnico di Milano Milano Italy analysed the local contraction and torsional movements and they indicated that alterations in cardiac function influence wall kinematics 2 3 5 6 An interesting approach to evaluate cardiac performance and activity could be the assessment of cardiac kinematics not locally but globally by analysing the displacement of the heart in 3 Dimensional 3D space throughout the cardiac cycle Global cardiac kinematics can be estimated by assessing the spatial displacement of a specific region of interest on the cardiac wall In particular the LVA could represent a significant site to focus on as it rotates more than other cardiac regions during contraction and it is also associated with considerable translational movements We propose a method based on a real time 3D magnetic tracking system to detect and analyse the spatial movements of the LVA relatively to a static Cartesian frame of reference A preliminary study about this new method for evaluating cardiac global kinematics is presented herein Abstract The assessment of Left Ventricular Apex LVA kinematics throughout the cardiac cycle could be useful for evaluating cardiac performance and efficiency We proposed and evaluated in a sheep the use of a real time 3D magnetic tracking system for the analysis of LVA kinematics LVA kinematics was assessed using a realtime 3D magnetic tracking system whose sensor was epicardially glued on the exposed LVA Two indexes were calculated from the 3 Dimensional apex path traced by the magnetic sensor the 3D Apex Path Length 3DAPL length of 3D apex path and the 3D Apex Path Volume 3DAPV volume containing 3D apex path Hemodynamic index of cardiac contractility LVdP dtMAX was derived from Left Ventricular Pressure LVP measurement



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