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Journal articles on the topic 'Cardiac kinematics'

Author: Grafiati

Published: 11 March 2023

Last updated: 31 July 2025

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1

Cutrì, Elena, Paola Bagnoli, Emanuela Marcelli, et al. "A Mechanical Simulator of Cardiac Wall Kinematics." ASAIO Journal 56, no. 3 (2010): 164–71. http://dx.doi.org/10.1097/mat.0b013e3181d7db0c.

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2

Fassina, Lorenzo, Giovanni Magenes, Roberto Gimmelli, and Fabio Naro. "Modulation of the Cardiomyocyte Contraction inside a Hydrostatic Pressure Bioreactor:In VitroVerification of the Frank-Starling Law." BioMed Research International 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/542105.

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We have studied beating mouse cardiac syncytiain vitroin order to assess the inotropic, ergotropic, and chronotropic effects of both increasing and decreasing hydrostatic pressures. In particular, we have performed an image processing analysis to evaluate the kinematics and the dynamics of those pressure-loaded beating syncytia starting from the video registration of their contraction movement. By this analysis, we have verified the Frank-Starling law of the heart inin vitrobeating cardiac syncytia and we have obtained their geometrical-functional classification.

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Fassina, Lorenzo, Marisa Cornacchione, Manuela Pellegrini та ін. "Model of Murine Ventricular Cardiac Tissue for In Vitro Kinematic-Dynamic Studies of Electromagnetic and β-Adrenergic Stimulation". Journal of Healthcare Engineering 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/4204085.

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In a model of murine ventricular cardiac tissue in vitro, we have studied the inotropic effects of electromagnetic stimulation (frequency, 75 Hz), isoproterenol administration (10 μM), and their combination. In particular, we have performed an image processing analysis to evaluate the kinematics and the dynamics of beating cardiac syncytia starting from the video registration of their contraction movement. We have found that the electromagnetic stimulation is able to counteract the β-adrenergic effect of isoproterenol and to elicit an antihypertrophic response.

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4

Damen, Frederick W., David T. Newton, Guang Lin, and Craig J. Goergen. "Machine Learning Driven Contouring of High-Frequency Four-Dimensional Cardiac Ultrasound Data." Applied Sciences 11, no. 4 (2021): 1690. http://dx.doi.org/10.3390/app11041690.

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Automatic boundary detection of 4D ultrasound (4DUS) cardiac data is a promising yet challenging application at the intersection of machine learning and medicine. Using recently developed murine 4DUS cardiac imaging data, we demonstrate here a set of three machine learning models that predict left ventricular wall kinematics along both the endo- and epi-cardial boundaries. Each model is fundamentally built on three key features: (1) the projection of raw US data to a lower dimensional subspace, (2) a smoothing spline basis across time, and (3) a strategic parameterization of the left ventricul

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5

Tsamis, Alkiviadis, Allen Cheng, Tom C. Nguyen, Frank Langer, D. Craig Miller, and Ellen Kuhl. "Kinematics of cardiac growth: In vivo characterization of growth tensors and strains." Journal of the Mechanical Behavior of Biomedical Materials 8 (April 2012): 165–77. http://dx.doi.org/10.1016/j.jmbbm.2011.12.006.

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6

Rozzi, Giacomo, Francesco P. Lo Muzio, Camilla Sandrini, et al. "Real-time video kinematic evaluation of the in situ beating right ventricle after pulmonary valve replacement in patients with tetralogy of Fallot: a pilot study." Interactive CardioVascular and Thoracic Surgery 29, no. 4 (2019): 625–31. http://dx.doi.org/10.1093/icvts/ivz120.

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Abstract OBJECTIVES The timing for pulmonary valve replacement (PVR) after tetralogy of Fallot repair is controversial, due to limitations in estimating right ventricular dysfunction and recovery. Intraoperative imaging could add prognostic information, but transoesophageal echocardiography is unsuitable for exploring right heart function. Right ventricular function after PVR was investigated in real time using a novel video-based contactless kinematic evaluation technology (Vi.Ki.E.), which calculates cardiac fatigue and energy consumption. METHODS Six consecutive patients undergoing PVR at 1

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7

Dabiri, John O., and Morteza Gharib. "The role of optimal vortex formation in biological fluid transport." Proceedings of the Royal Society B: Biological Sciences 272, no. 1572 (2005): 1557–60. http://dx.doi.org/10.1098/rspb.2005.3109.

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Animal phyla that require macro-scale fluid transport for functioning have repeatedly and often independently converged on the use of jet flows. During flow initiation these jets form fluid vortex rings, which facilitate mass transfer by stationary pumps (e.g. cardiac chambers) and momentum transfer by mobile systems (e.g. jet-propelled swimmers). Previous research has shown that vortex rings generated in the laboratory can be optimized for efficiency or thrust, based on the jet length-to-diameter ratio ( L / D ), with peak performance occurring at 3.5< L / D <4.5. Attempts to determine

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8

Ayers, B., G. Olverson, A. Aguirre, S. Rabi, A. Osho, and D. D'Alessandro. "Non-Invasive Beating Heart Video Kinematics Correlate with Cardiac Function During Ex-Vivo Perfusion." Journal of Heart and Lung Transplantation 43, no. 4 (2024): S157. http://dx.doi.org/10.1016/j.healun.2024.02.317.

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9

Kindberg, K., M. Karlsson, N. B. Ingels, and J. C. Criscione. "Nonhomogeneous Strain From Sparse Marker Arrays for Analysis of Transmural Myocardial Mechanics." Journal of Biomechanical Engineering 129, no. 4 (2006): 603–10. http://dx.doi.org/10.1115/1.2746385.

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Background: Knowledge of normal cardiac kinematics is important when attempting to understand the mechanisms that impair the contractile function of the heart during disease. The complex kinematics of the heart can be studied by inserting radiopaque markers in the cardiac wall and study the pumping heart with biplane cineradiography. In order to study the local strain, the bead array was developed where small radiopaque beads are inserted along three columns transmurally in the left ventricle. Method: This paper suggests a straightforward method for strain computation, based on polynomial leas

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10

Douglas, A. S., E. K. Rodriguez, W. O'Dell, and W. C. Hunter. "Unique strain history during ejection in canine left ventricle." American Journal of Physiology-Heart and Circulatory Physiology 260, no. 5 (1991): H1596—H1611. http://dx.doi.org/10.1152/ajpheart.1991.260.5.h1596.

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Understanding the relationship between structure and function in the heart requires a knowledge of the connection between the local behavior of the myocardium (e.g., shortening) and the pumping action of the left ventricle. We asked the question, how do changes in preload and afterload affect the relationship between local myocardial deformation and ventricular volume? To study this, a set of small radiopaque beads was implanted in approximately 1 cm3 of the isolated canine heart left ventricular free wall. Using biplane cineradiography, we tracked the motion of these markers through various c

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11

Zou, Xianghua, Bin Li, Cong Wang, Jian Chang, and Yanbin Li. "Simulation and Experiment of Cardiopulmonary Resuscitation Robot." Journal of Physics: Conference Series 2493, no. 1 (2023): 012017. http://dx.doi.org/10.1088/1742-6596/2493/1/012017.

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Abstract Aiming at the emergence of patients with outdoor cardiac arrest, to strive for more golden rescue time, a robot suitable for the rescue of patients with outdoor cardiac arrest is proposed. Combined with the medical research on the human thorax, the dynamic model of the human thorax is established, the kinematics and dynamics of the end effector mechanism are analyzed, and the robot is simulated for cardiopulmonary resuscitation in the human thorax with Adams software. The relationship between the stroke, speed, acceleration, driving torque, and time of the end effector is obtained. Se

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12

Loschak, Paul M., Alperen Degirmenci, Cory M. Tschabrunn, Elad Anter, and Robert D. Howe. "Automatically steering cardiac catheters in vivo with respiratory motion compensation." International Journal of Robotics Research 39, no. 5 (2020): 586–97. http://dx.doi.org/10.1177/0278364920903785.

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A robotic system for automatically navigating ultrasound (US) imaging catheters can provide real-time intra-cardiac imaging for diagnosis and treatment while reducing the need for clinicians to perform manual catheter steering. Clinical deployment of such a system requires accurate navigation despite the presence of disturbances including cyclical physiological motions (e.g., respiration). In this work, we report results from in vivo trials of automatic target tracking using our system, which is the first to navigate cardiac catheters with respiratory motion compensation. The effects of respir

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13

Hayabuchi, Yasunobu, Akemi Ono, Yukako Homma, and Shoji Kagami. "Assessment of pulmonary arterial compliance evaluated using harmonic oscillator kinematics." Pulmonary Circulation 7, no. 3 (2017): 666–73. http://dx.doi.org/10.1177/2045893217714781.

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We hypothesized that KPA, a harmonic oscillator kinematics-derived spring constant parameter of the pulmonary artery pressure (PAP) profile, reflects PA compliance in pediatric patients. In this prospective study of 33 children (age range = 0.5–20 years) with various cardiac diseases, we assessed the novel parameter designated as KPA calculated using the pressure phase plane and the equation KPA = (dP/dt_max)2/([Pmax – Pmin])/2)2, where dP/dt_max is the peak derivative of PAP, and Pmax – Pmin is the difference between the minimum and maximum PAP. PA compliance was also calculated using two con

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14

Scarpolini, Martino Andrea, Giulia Piumini, Emanuele Gasparotti, et al. "Guiding patient-specific cardiac simulations through data-assimilation of soft tissue kinematics from dynamic CT scan." Computers in Biology and Medicine 189 (May 2025): 109876. https://doi.org/10.1016/j.compbiomed.2025.109876.

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15

Truong, Quynh A., Wai-ee Thai, Bryan Wai, et al. "A NEW METHOD USING CARDIAC CT KINEMATICS TO REFLECT THE ACTIVATION PATTERN VISUALIZED WITH ELECTROANATOMICAL MAP: CARDIAC CT PHASE TIME VELOCITY ACTIVATION-ENCODED MAP (ACTIVATE)." Journal of the American College of Cardiology 61, no. 10 (2013): E913. http://dx.doi.org/10.1016/s0735-1097(13)60913-4.

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16

Ghosh, Erina, Leonid Shmuylovich, and Sándor J. Kovács. "Vortex formation time-to-left ventricular early rapid filling relation: model-based prediction with echocardiographic validation." Journal of Applied Physiology 109, no. 6 (2010): 1812–19. http://dx.doi.org/10.1152/japplphysiol.00645.2010.

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During early rapid filling, blood aspirated by the left ventricle (LV) generates an asymmetric toroidal vortex whose development has been quantified using vortex formation time (VFT), a dimensionless index defined by the length-to-diameter ratio of the aspirated (equivalent cylindrical) fluid column. Since LV wall motion generates the atrioventricular pressure gradient resulting in the early transmitral flow (Doppler E-wave) and associated vortex formation, we hypothesized that the causal relation between VFT and diastolic function (DF), parametrized by stiffness, relaxation, and load, can be

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17

Yip, Michael C., Jake A. Sganga, and David B. Camarillo. "Autonomous Control of Continuum Robot Manipulators for Complex Cardiac Ablation Tasks." Journal of Medical Robotics Research 02, no. 01 (2017): 1750002. http://dx.doi.org/10.1142/s2424905x17500027.

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Continuum manipulators enable minimally-invasive surgery on the beating heart, but the challenges involved in manually controlling the manipulator’s tip position and contact force with the tissue result in failed procedures and complications. The objective of this work is to achieve autonomous robotic control of a continuum manipulator’s position and force in a beating heart model. We present a model-less hybrid control approach that regulates the tip position/force of manipulators with unknown kinematics/mechanics, under unknown constraints along the manipulator’s body. The algorithms estimat

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18

Fassina, Lorenzo, Antonio Di Grazia, Fabio Naro, Lucia Monaco, Maria Gabriella Cusella De Angelis, and Giovanni Magenes. "Video Evaluation of the Kinematics and Dynamics of the Beating Cardiac Syncytium: An Alternative to the Langendorff Method." International Journal of Artificial Organs 34, no. 7 (2011): 546–58. http://dx.doi.org/10.5301/ijao.2011.8510.

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19

Gao, Hao, Andrej Aderhold, Kenneth Mangion, Xiaoyu Luo, Dirk Husmeier, and Colin Berry. "Changes and classification in myocardial contractile function in the left ventricle following acute myocardial infarction." Journal of The Royal Society Interface 14, no. 132 (2017): 20170203. http://dx.doi.org/10.1098/rsif.2017.0203.

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In this research, we hypothesized that novel biomechanical parameters are discriminative in patients following acute ST-segment elevation myocardial infarction (STEMI). To identify these biomechanical biomarkers and bring computational biomechanics ‘closer to the clinic’, we applied state-of-the-art multiphysics cardiac modelling combined with advanced machine learning and multivariate statistical inference to a clinical database of myocardial infarction. We obtained data from 11 STEMI patients (ClinicalTrials.gov NCT01717573) and 27 healthy volunteers, and developed personalized mathematical

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20

Muzio, Francesco Paolo Lo, Giacomo Rozzi, Stefano Rossi, et al. "Supervised machine learning classifiers and cardiac kinematics support decision-making during open-chest surgery of Tetralogy of Fallot patients." Vascular Pharmacology 146 (October 2022): 107053. http://dx.doi.org/10.1016/j.vph.2022.107053.

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21

Imbrie-Moore, Annabel M., Matthew H. Park, Michael J. Paulsen, et al. "Biomimetic six-axis robots replicate human cardiac papillary muscle motion: pioneering the next generation of biomechanical heart simulator technology." Journal of The Royal Society Interface 17, no. 173 (2020): 20200614. http://dx.doi.org/10.1098/rsif.2020.0614.

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Papillary muscles serve as attachment points for chordae tendineae which anchor and position mitral valve leaflets for proper coaptation. As the ventricle contracts, the papillary muscles translate and rotate, impacting chordae and leaflet kinematics; this motion can be significantly affected in a diseased heart. In ex vivo heart simulation, an explanted valve is subjected to physiologic conditions and can be adapted to mimic a disease state, thus providing a valuable tool to quantitatively analyse biomechanics and optimize surgical valve repair. However, without the inclusion of papillary mus

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22

Cutugno, Salvatore, Valentina Agnese, Giovanni Gentile, et al. "Patient-Specific Analysis of Ascending Thoracic Aortic Aneurysm with the Living Heart Human Model." Bioengineering 8, no. 11 (2021): 175. http://dx.doi.org/10.3390/bioengineering8110175.

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In ascending thoracic aortic aneurysms (ATAAs), aneurysm kinematics are driven by ventricular traction occurring every heartbeat, increasing the stress level of dilated aortic wall. Aortic elongation due to heart motion and aortic length are emerging as potential indicators of adverse events in ATAAs; however, simulation of ATAA that takes into account the cardiac mechanics is technically challenging. The objective of this study was to adapt the realistic Living Heart Human Model (LHHM) to the anatomy and physiology of a patient with ATAA to assess the role of cardiac motion on aortic wall str

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23

de Tullio, M. D., G. Pascazio, L. Weltert, R. De Paulis, and R. Verzicco. "Evaluation of prosthetic-valved devices by means of numerical simulations." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1945 (2011): 2502–9. http://dx.doi.org/10.1098/rsta.2010.0365.

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The in vivo evaluation of prosthetic device performance is often difficult, if not impossible. In particular, in order to deal with potential problems such as thrombosis, haemolysis, etc., which could arise when a patient undergoes heart valve replacement, a thorough understanding of the blood flow dynamics inside the devices interacting with natural or composite tissues is required. Numerical simulation, combining both computational fluid and structure dynamics, could provide detailed information on such complex problems. In this work, a numerical investigation of the mechanics of two composi

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24

Ilewicz, Grzegorz, and Edyta Ładyżyńska-Kozdraś. "Specifying Inputs for the Computational Structure of a Surgical System via Optical Method and DLT Algorithm Based on In Vitro Experiments on Cardiovascular Tissue in Minimally Invasive and Robotic Surgery." Sensors 22, no. 6 (2022): 2335. http://dx.doi.org/10.3390/s22062335.

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With the application of four optical CMOS sensors, it was possible to capture the trajectory of an endoscopic tool during an in vitro surgical experiment on a cardiovascular preparation. This was due to the possibility of obtaining a path when a reflective marker was attached. In the work, APAS (Ariel Performance Analysis System) software and DLT (direct linear transformation) algorithm were used. This made it possible to acquire kinematic inputs to the computational model of dynamics, which enabled, regardless of the type of surgical robot structure, derivation of the analogous motion of an e

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Dickson, Kathryn A., Jeanine M. Donley, Chugey Sepulveda, and Lisa Bhoopat. "Effects of temperature on sustained swimming performance and swimming kinematics of the chub mackerelScomber japonicus." Journal of Experimental Biology 205, no. 7 (2002): 969–80. http://dx.doi.org/10.1242/jeb.205.7.969.

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SUMMARYThe effects of a 6°C difference in water temperature on maximum sustained swimming speed, swimming energetics and swimming kinematics were measured in the chub mackerel Scomber japonicus (Teleostei:Scombridae), a primarily coastal, pelagic predator that inhabits subtropical and temperate transition waters of the Atlantic, Pacific and Indian Oceans. New data for chub mackerel acclimated to 18°C are compared with published data from our laboratory at 24°C. Twelve individuals acclimated to each of two temperatures (15.6-26.3 cm fork length, FL, and 34-179g at 18°C; 14.0-24.7 cm FL and 26-1

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26

Rozzi, G., F. Ranieri, S. Rossi, et al. "Novel evaluation of cardiac kinematics/dynamics parameters for in-situ heart by a high-speed bright-field video mapping validated by epicardial multiple lead recording." Vascular Pharmacology 75 (December 2015): 68–69. http://dx.doi.org/10.1016/j.vph.2015.11.070.

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27

Lo Muzio, Francesco Paolo, Giacomo Rozzi, Stefano Rossi, et al. "Artificial Intelligence Supports Decision Making during Open-Chest Surgery of Rare Congenital Heart Defects." Journal of Clinical Medicine 10, no. 22 (2021): 5330. http://dx.doi.org/10.3390/jcm10225330.

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The human right ventricle is barely monitored during open-chest surgery due to the absence of intraoperative imaging techniques capable of elaborating its complex function. Accordingly, artificial intelligence could not be adopted for this specific task. We recently proposed a video-based approach for the real-time evaluation of the epicardial kinematics to support medical decisions. Here, we employed two supervised machine learning algorithms based on our technique to predict the patients’ outcomes before chest closure. Videos of the beating hearts were acquired before and after pulmonary val

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Wangwittayakul, Visit, Thanainit Chotanaphuti, Saradej Khuangsirikul, and Songpol Trakulngernthai. "THE EFFECT OF A TOURNIQUET ON INTRAOPERATIVE SOFT TISSUE BALANCE IN CAS TOTAL KNEE ARTHROPLASTY." Journal of Southeast Asian Medical Research 2, no. 2 (2018): 92–97. http://dx.doi.org/10.55374/jseamed.v2i2.14.

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Background: The acquirement of appropriate soft tissue balancing and accurate alignment is an essential procedure in total knee arthroplasty (TKA). Gap balancing affects the final knee kinematics , and inadequate correction of soft tissue imbalances is considered an important factor for early TKA failure. During total knee arthroplasty (TKA), tourniquets are widely used to provide clear visualization of the tissue. The aim of the present study was to evaluate the effect of a tourniquet on intraoperative soft tissue balance in CAS total knee arthroplasty. Method: In this prospective cohort stud

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29

Lemire, Marcel, Romain Remetter, Thomas J. Hureau, et al. "Energy Cost of Running in Well-Trained Athletes: Toward Slope-Dependent Factors." International Journal of Sports Physiology and Performance 17, no. 3 (2022): 423–31. http://dx.doi.org/10.1123/ijspp.2021-0047.

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Purpose: This study aimed to determine the contribution of metabolic, cardiopulmonary, neuromuscular, and biomechanical factors to the energy cost (ECR) of graded running in well-trained runners. Methods: Eight men who were well-trained trail runners (age: 29 [10] y, mean [SD]; maximum oxygen consumption: 68.0 [6.4] mL·min−1·kg−1) completed maximal isometric evaluations of lower limb extensor muscles and 3 randomized trials on a treadmill to determine their metabolic and cardiovascular responses and running gait kinematics during downhill (DR: −15% slope), level (0%), and uphill running (UR: 1

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30

Muzi, Nicolás, Luis G. Moyano, and Daniel Millán. "Kirchoff-Love Thin-shells Prestressed State Estimation by MULF: Application to Intracranial Aneurysms." Resúmenes de Mecánica Computacional 1, no. 16 (2024): 169. https://doi.org/10.70567/rmc.v1i16.207.

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When an intracranial aneurysm is diagnosed, physicians found themselves in the dichotomy of treating it or monitoring it, as while subarachnoid hemorrhage presents a 45% of mortality rate, the endovascular occlusion of cerebral aneurysms is not a risk-free procedure. In particular, it is believed that the aneurysm neck and its surroundings are very sensitive to applied loads, causing structural instabilities which increase the intraoperative rupture risk. For a better understanding of this issue, in previous work we performed simulations of localized loads in the neck neighboring area for a da

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31

Battista, Nicholas, Dylan Douglas, Andrea Lane, Leigh Samsa, Jiandong Liu, and Laura Miller. "Vortex Dynamics in Trabeculated Embryonic Ventricles." Journal of Cardiovascular Development and Disease 6, no. 1 (2019): 6. http://dx.doi.org/10.3390/jcdd6010006.

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Proper heart morphogenesis requires a delicate balance between hemodynamic forces, myocardial activity, morphogen gradients, and epigenetic signaling, all of which are coupled with genetic regulatory networks. Recently both in vivo and in silico studies have tried to better understand hemodynamics at varying stages of veretebrate cardiogenesis. In particular, the intracardial hemodynamics during the onset of trabeculation is notably complex—the inertial and viscous fluid forces are approximately equal at this stage and small perturbations in morphology, scale, and steadiness of the flow can le

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32

Moreno Tarazona, Alejandra, Lola Xiomara Bautista, and Fabio Martínez. "Discriminación de enfermedades cardiacas utilizando patrones cinemáticos codificados con convoluciones 3D en secuencias de cine-RM." Biomédica 44, Sp. 1 (2024): 89–100. http://dx.doi.org/10.7705/biomedica.7115.

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Introduction. Cine-MRI (cine-magnetic resonance imaging) sequences are a key diagnostic tool to visualize anatomical information, allowing experts to localize and determine suspicious pathologies. Nonetheless, such analysis remains subjective and prone to diagnosis errors.Objective. To develop a binary and multi-class classification considering various cardiac conditions using a spatiotemporal model that highlights kinematic movements to characterize each disease.Materials and methods. This research focuses on a 3D convolutional representation to characterize cardiac kinematic patterns during

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33

Nastenko, Ievgen, Vitaliy Maksymenko, Sergiy Potashev, et al. "Random Forest Algorithm Construction for the Diagnosis of Coronary Heart Disease Based on Echocardiography Video Data Streams." Innovative Biosystems and Bioengineering 5, no. 1 (2021): 61–69. http://dx.doi.org/10.20535/ibb.2021.5.1.225794.

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Background. Recent studies show that cardiovascular diseases, including coronary heart disease, are the leading causes of death and one of the main factors of disability worldwide. The detection of cases of this type of disease over the past 30 years has increased from 271 million to 523 million and the number of deaths – from 12.1 million to 18.6 million. Cardiovascular diseases are the main cause of death among the population of Ukraine and, according to this indicator, the country remains one of the world leaders. Coronary heart disease is the leading factor in the loss of health in Ukraine

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34

Mocan, Bogdan, Claudiu Schonstein, Calin Neamtu, et al. "CardioVR-ReTone—Robotic Exoskeleton for Upper Limb Rehabilitation following Open Heart Surgery: Design, Modelling, and Control." Symmetry 14, no. 1 (2022): 81. http://dx.doi.org/10.3390/sym14010081.

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Following cardiac surgery, patients experience difficulties with the rehabilitation process, often finding it difficult, and therefore lack the motivation for rehabilitation activities. As the number of people aged 65 and over will rise by 207 percent globally by 2050, the need for cardiac rehabilitation will significantly increase, as this is the main population to experience heart problems. To address this challenge, this paper proposes a new robotic exoskeleton concept with 12 DoFs (6 DoFs on each arm), with a symmetrical structure for the upper limbs, to be used in the early rehabilitation

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35

Mayer, Hermann, Istvan Nagy, Alois Knoll, Eva U. Braun, Robert Bauernschmitt, and Rüdiger Lange. "Haptic Feedback in a Telepresence System for Endoscopic Heart Surgery." Presence: Teleoperators and Virtual Environments 16, no. 5 (2007): 459–70. http://dx.doi.org/10.1162/pres.16.5.459.

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The implementation of telemanipulator systems for cardiac surgery enabled heart surgeons to perform delicate minimally invasive procedures with high precision under stereoscopic view. At present, commercially available systems do not provide force-feedback or Cartesian control for the operating surgeon. The lack of haptic feedback may cause damage to tissue and can cause breaks of suture material. In addition, minimally invasive procedures are very tiring for the surgeon due to the need for visual compensation for the missing force feedback. While a lack of Cartesian control of the end effecto

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Langer, John. "Regression Analysis of the Left-ventricular Isochoric Pressure Decay of the Heart: Four or Five Model Parameters?" International Cardiovascular Forum Journal 4 (December 4, 2015): 53. http://dx.doi.org/10.17987/icfj.v4i0.168.

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BACKGROUND: Isochoric (isovolumic) cardiac pressure decay data were previously described by a four-parametric logistic (tangens hyperbolicus) regression model (Langer model). However, a five-parametric kinematic model (Chung model), according to the differential equation of damped oscillation, was recently introduced to describe the isochoric pressure fall. The present study clarifies (a/) whether these five parameters can be reliably estimated from empirical pressure decay data and if the model excels the four-parametric one, and (b/) whether the kinematic Chung model validly describes these

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Mossahebi, Sina, Leonid Shmuylovich, and Sándor J. Kovács. "The thermodynamics of diastole: kinematic modeling-based derivation of the P-V loop to transmitral flow energy relation with in vivo validation." American Journal of Physiology-Heart and Circulatory Physiology 300, no. 2 (2011): H514—H521. http://dx.doi.org/10.1152/ajpheart.00814.2010.

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Pressure-volume (P-V) loop-based analysis facilitates thermodynamic assessment of left ventricular function in terms of work and energy. Typically these quantities are calculated for a cardiac cycle using the entire P-V loop, although thermodynamic analysis may be applied to a selected phase of the cardiac cycle, specifically, diastole. Diastolic function is routinely quantified by analysis of transmitral Doppler E-wave contours. The first law of thermodynamics requires that energy (ε) computed from the Doppler E-wave (εE-wave) and the same portion of the P-V loop (εP-V E-wave) be equivalent.

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Ijiri, Takashi, Takashi Ashihara, Nobuyuki Umetani, et al. "A Kinematic Approach for Efficient and Robust Simulation of the Cardiac Beating Motion." PLoS ONE 7, no. 5 (2012): e36706. http://dx.doi.org/10.1371/journal.pone.0036706.

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39

Mocan, Bogdan, Claudiu Schonstein, Mircea Murar, et al. "Upper-Limb Robotic Exoskeleton for Early Cardiac Rehabilitation Following an Open-Heart Surgery—Mathematical Modelling and Empirical Validation." Mathematics 11, no. 7 (2023): 1598. http://dx.doi.org/10.3390/math11071598.

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Robotic exoskeletons have the potential to enhance the quality of life of patients undergoing cardiac rehabilitation. Recent studies found that the use of such devices was associated with significant improvements in physical function, mobility, and overall well-being for individuals recovering from a cardiac event. These improvements were seen across a range of measures, including cardiovascular fitness, muscle strength, and joint range of motion. In addition, the use of robotic exoskeletons may help to accelerate the rehabilitation process, allowing patients to make faster progress towards th

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Shi, Pengcheng, and Huafeng Liu. "Stochastic finite element framework for simultaneous estimation of cardiac kinematic functions and material parameters." Medical Image Analysis 7, no. 4 (2003): 445–64. http://dx.doi.org/10.1016/s1361-8415(03)00066-5.

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Bishop, C., and P. Butler. "Physiological modelling of oxygen consumption in birds during flight." Journal of Experimental Biology 198, no. 10 (1995): 2153–63. http://dx.doi.org/10.1242/jeb.198.10.2153.

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This study combines data on changes in cardiovascular variables with body mass (Mb) and with exercise intensity to model the oxygen supply available to birds during flight. Its main purpose is to provide a framework for identifying the factors involved in limiting aerobic power input to birds during flight and to suggest which cardiovascular variables are the most likely to have been influenced by natural selection when considering both allometric and adaptive variation. It is argued that natural selection has acted on heart rate (fh) and cardiac stroke volume (Vs), so that the difference in t

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Yedukondalu, G., Sajjan Patnaik, P. Lakshmi Venkatesh, and S. Siva Jagadeesh. "Chest compression with 2-DOF parallel manipulator for cardiopulmonary resuscitation." International Journal of Engineering & Technology 7, no. 2.8 (2018): 211. http://dx.doi.org/10.14419/ijet.v7i2.8.10411.

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Chest compression process is used for recovering patients who met with a cardiac arrest in emergency situations. Chest compression is the only possibility of rescuing patients during cardiopulmonary resuscitation (CPR). It is hard to achieve the exact chest compression’s depth and rate even by experienced professionals as per the CPR guideline. A 2-DOF 2-RRR translational parallel manipulator was designed for delivering chest compressions. The kinematic analysis is carried out analytically.The workspace of the manipulator is examined in consideration of physical constraints imposed by joints.

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Soleimani, Reza, and Edgar Lobaton. "Enhancing Inference on Physiological and Kinematic Periodic Signals via Phase-Based Interpretability and Multi-Task Learning." Information 13, no. 7 (2022): 326. http://dx.doi.org/10.3390/info13070326.

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Physiological and kinematic signals from humans are often used for monitoring health. Several processes of interest (e.g., cardiac and respiratory processes, and locomotion) demonstrate periodicity. Training models for inference on these signals (e.g., detection of anomalies, and extraction of biomarkers) require large amounts of data to capture their variability, which are not readily available. This hinders the performance of complex inference models. In this work, we introduce a methodology for improving inference on such signals by incorporating phase-based interpretability and other infer

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Guan, Debao, Lian Tian, Wei Li, and Hao Gao. "Using LDDMM and a kinematic cardiac growth model to quantify growth and remodelling in rat hearts under PAH." Computers in Biology and Medicine 171 (March 2024): 108218. http://dx.doi.org/10.1016/j.compbiomed.2024.108218.

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Sheehan, Florence H., and R. Eugene Zierler. "Simulation for competency assessment in vascular and cardiac ultrasound." Vascular Medicine 23, no. 2 (2018): 172–80. http://dx.doi.org/10.1177/1358863x17751656.

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Healthcare providers who use peripheral vascular and cardiac ultrasound require specialized training to develop the technical and interpretive skills necessary to perform accurate diagnostic tests. Assessment of competence is a critical component of training that documents a learner’s progress and is a requirement for competency-based medical education (CBME) as well as specialty certification or credentialing. The use of simulation for CBME in diagnostic ultrasound is particularly appealing since it incorporates both the psychomotor and cognitive domains while eliminating dependency on the av

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Riordan, Matt M., and Sándor J. Kovács. "Absence of diastolic mitral annular oscillations is a marker for relaxation-related diastolic dysfunction." American Journal of Physiology-Heart and Circulatory Physiology 292, no. 6 (2007): H2952—H2958. http://dx.doi.org/10.1152/ajpheart.01356.2006.

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Although Doppler tissue imaging frequently indicates the presence of mitral annular oscillations (MAO) following the E′ wave (E″ wave, etc.), only recently was it shown that annular “ringing” follows the rules of damped harmonic oscillatory motion. Oscillatory model-based analysis of E′ and E″ waves provides longitudinal left ventricular (LV) stiffness ( k′), relaxation/viscoelasticity ( c′), and stored elastic strain ( xo′) parameters. We tested the hypothesis that presence (MAO+) vs. absence (MAO−) of diastolic MAO is an index of superior LV relaxation by analyzing simultaneous echocardiogra

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Bowman, Andrew W., Paul A. Frihauf, and Sándor J. Kovács. "Time-varying effective mitral valve area: prediction and validation using cardiac MRI and Doppler echocardiography in normal subjects." American Journal of Physiology-Heart and Circulatory Physiology 287, no. 4 (2004): H1650—H1657. http://dx.doi.org/10.1152/ajpheart.00269.2004.

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Precise knowledge of the volume and rate of early rapid left ventricular (LV) filling elucidates kinematic aspects of diastolic physiology. The Doppler E wave velocity-time integral (VTI) is conventionally used as the estimate of early, rapid-filling volume; however, this implicitly requires the assumption of a constant effective mitral valve area (EMVA). We sought to evaluate whether the EMVA is truly constant throughout early, rapid filling in 10 normal subjects using cardiac magnetic resonance imaging (MRI) and contemporaneous Doppler echocardiography, which were synchronized via ECG. LV vo

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Hirasawa, Nobuhiro, Yukiyo Shimizu, Ayumu Haginoya, et al. "Comparative Analysis of Muscle Activity and Circulatory Dynamics: A Crossover Study Using Leg Exercise Apparatus and Ergometer." Medicina 60, no. 8 (2024): 1260. http://dx.doi.org/10.3390/medicina60081260.

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Background and Objectives: Bedridden patients are at a high risk of venous thromboembolism (VTE). Passive devices such as elastic compression stockings and intermittent pneumatic compression are common. Leg exercise apparatus (LEX) is an active device designed to prevent VTE by effectively contracting the soleus muscle and is therefore expected to be effective in preventing disuse of the lower limbs. However, few studies have been conducted on the kinematic properties of LEX. Therefore, this study aimed to compare the exercise characteristics of LEX with those of an ergometer, which is commonl

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Bhagavan, Druv, William M. Padovano, and Sándor J. Kovács. "Alternative diastolic function models of ventricular longitudinal filling velocity are mathematically identical." American Journal of Physiology-Heart and Circulatory Physiology 318, no. 5 (2020): H1059—H1067. http://dx.doi.org/10.1152/ajpheart.00681.2019.

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The spatiotemporal features of normal in vivo cardiac motion are well established. Longitudinal velocity has become a focus of diastolic function (DF) characterization, particularly the tissue Doppler e′-wave, manifesting in early diastole when the left ventricle (LV) is a mechanical suction pump (dP/dV < 0). To characterize DF and elucidate mechanistic features, several models have been proposed and have been previously compared algebraically, numerically, and in their ability to fit physiological velocity data. We analyze two previously noncompared models of early rapid-filling lengthenin

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Melczer, Csaba, László Melczer, András Oláh, Mónika Sélleyné-Gyúró, Zsanett Welker, and Pongrác Ács. "Telemetry Option in the Measurement of Physical Activity for Patients with Heart Failure." Practice and Theory in Systems of Education 10, no. 2 (2015): 209–16. http://dx.doi.org/10.1515/ptse-2015-0020.

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AbstractMeasurement of physical activity among patients with heart failure typically requires a special approach due to the patients’ physical status. Nowadays, a technology is already available that can measure the kinematic movements in 3-D by a pacemaker and implantable defibrillator giving an assessment on software. The telemetry data can be transmitted to a central system. The research aims to elaborate the methods that help to compare of the data concerning physical activity both built-in an accelerometer in Cardiac Resychrinisation Therapy (CRT) devices and data obtained from an externa

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