The dynamic cardiac biosimulator: A method for training physicians in beating-heart mitral valve repair procedures Alberto M. Leopaldi, PhD, Krzysztof.

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Presentation transcript:

The dynamic cardiac biosimulator: A method for training physicians in beating-heart mitral valve repair procedures Alberto M. Leopaldi, PhD, Krzysztof Wrobel, MD, Giovanni Speziali, MD, Sjoerd van Tuijl, BSc, Agne Drasutiene, MD, W. Randolph Chitwood, MD The Journal of Thoracic and Cardiovascular Surgery Volume 155, Issue 1, Pages 147-155 (January 2018) DOI: 10.1016/j.jtcvs.2017.09.011 Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

Figure 1 Schematic diagram of the dynamic cardiac biosimulator. (1) Pulse duplicator with a computer-controlled piston pump capable of replicating physiologic flow and ventricular pressure. (2) Apical cannula connecting the pulse duplicator to the left ventricle chamber. (3) Porcine heart (4) Aortic cannula connected to the ascending aorta. (5) Compliant silicone tube that mimics aortic compliance. (6) Afterload module comprised of two adjustable resistances and a compliant air tank. (7) Service reservoir. (8) Centrifugal pump used to provide fluid to the preload module. (9) Preload module composed of a small air tank and a silicone tube to mimic venous compliance. (10) Adjustable Starling resistor to ensure that atrial pressures are maintained at physiologic levels. (11) Endoscope with high definition camera to video the mitral valve. (12) Atrial cannula to convey the preload fluid to the left atrium. The Journal of Thoracic and Cardiovascular Surgery 2018 155, 147-155DOI: (10.1016/j.jtcvs.2017.09.011) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

Figure 2 Graphic representation of the simulator during the artificial chordae placement procedure. The echocardiographic probe placed on the posterior left atrial wall. Hemodynamic parameters are measured simultaneously with endoscopic and echo visualization. LA, Left atrium; LV, left ventricle; BP, blood pressure; LAP, left atrial pressure; LVP, left ventricular pressure. The Journal of Thoracic and Cardiovascular Surgery 2018 155, 147-155DOI: (10.1016/j.jtcvs.2017.09.011) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

Figure 3 Left, The dynamic cardiac biosimulator system. Echo probe (EP), pulse duplicator (PD), and Neochord device (D). Right, Transesophageal echo probe placed on the epicardium of the left atrial wall. The Journal of Thoracic and Cardiovascular Surgery 2018 155, 147-155DOI: (10.1016/j.jtcvs.2017.09.011) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

Figure 4 Left, The surgeon is navigating the device to engage the flail mitral valve leaflet with simultaneous 2-dimensional and 3-dimensional echo imaging well as intra-atrial videoscopy. Right, Echo probe manipulation and image evaluations are done simultaneously by an experienced cardiac anesthesiologist. After flail leaflet capture by the Neochord device, a extruded polytetrafluoroethylene chord is placed to reduce the prolapse under hemodynamic, videoscopic, and echocardiographic monitoring. The Journal of Thoracic and Cardiovascular Surgery 2018 155, 147-155DOI: (10.1016/j.jtcvs.2017.09.011) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

Figure 5 Hemodynamic tracings showing the effect of artificial chordae implantation into a flail mitral leaflet before and after correction of MR. Left, LAP and AoP with a prolapsing mitral valve and severe MR. Right, The same parameters after the mitral valve flail leaflet has been repaired with the artificial chordae. Note the decrease in LAP with concomitant increase in AoP after correction of the severe MR. AoP, Aortic systemic pressure; LAP, left atrial pressure; MR, mitral regurgitation. The Journal of Thoracic and Cardiovascular Surgery 2018 155, 147-155DOI: (10.1016/j.jtcvs.2017.09.011) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

Figure 6 Left atrial endoscopic images. Left, prolapsing mitral valve with the DS1000 system positioned to capture the prolapsing leaflet segment. Right, The leaflet is captured and an artificial chorda is being deployed. The Journal of Thoracic and Cardiovascular Surgery 2018 155, 147-155DOI: (10.1016/j.jtcvs.2017.09.011) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

Figure 7 Representative 2-dimensional echo images during the procedure. X-plane modality with long axis and bi-commisural view. A and B, Device passage through left ventricular cavity and mitral valve plane. C and D, Arrow: Neochord device tip. E, Grasping of the leaflet with the open device (arrow) displayed simultaneously in 3-dimensional and 2-dimensional images. The Journal of Thoracic and Cardiovascular Surgery 2018 155, 147-155DOI: (10.1016/j.jtcvs.2017.09.011) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

Figure 8 Three-dimensional zoom mode with en face view of the mitral valve: A, P2 prolapse with multiple ruptured chords before the procedure; B, Neochord device in the left atrium - positioning adjacent to the prolapsing segment; C, P2 leaflet grasping; D, Final anatomical result after ePTFE chord implantation and length adjustment. AMVL, Anterior mitral valve leaflet; P1, anteriormedial scallop; P2, middle scallop; P3, posteriolateral scallop; Ao, aortic valve; PMVL, posterior mitral valve leaflet. The Journal of Thoracic and Cardiovascular Surgery 2018 155, 147-155DOI: (10.1016/j.jtcvs.2017.09.011) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

A dynamic cardiac biosimulator to train surgeons in beating-heart mitral valve repair. The Journal of Thoracic and Cardiovascular Surgery 2018 155, 147-155DOI: (10.1016/j.jtcvs.2017.09.011) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

Video 1 Dynamic biosimulatior: Off-pump mitral valve repair. Video available at: http://www.jtcvsonline.org/article/S0022-5223(17)31914-1/fulltext. The Journal of Thoracic and Cardiovascular Surgery 2018 155, 147-155DOI: (10.1016/j.jtcvs.2017.09.011) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions