keyword
https://read.qxmd.com/read/18049852/barium-enhanced-imaging-of-the-coronary-vasculature-of-the-porcine-myocardium-empirical-investigation-into-the-theory-of-the-ventricular-myocardial-band
#21
JOURNAL ARTICLE
Hiroshi Nagamine, Shigeharu Sawa, Hiroiku Hara, Chikako Ikeda, Masanari Shimada, Go Watanabe
OBJECTIVE: The ventricular myocardium is thought to exist as a single continuous muscle band that extends from the pulmonary artery to the aorta, wrapped into a double helical coil Torrent-Guasp's theory of the ventricular myocardial band (VMB). The purpose of this study was to examine the coronary blood supply to the VMB and to evaluate the effect of coronary blood systems on structure-function relations in the myocardium. METHODS: VMBs of nine swine hearts were unwrapped after postmortem barium coronary angiography...
November 2007: General Thoracic and Cardiovascular Surgery
https://read.qxmd.com/read/17433997/the-ventricular-myocardial-band-of-torrent-guasp-the-controversy-an-editorial
#22
EDITORIAL
Erle H Austin
No abstract text is available yet for this article.
2007: Seminars in Thoracic and Cardiovascular Surgery. Pediatric Cardiac Surgery Annual
https://read.qxmd.com/read/17433994/potential-implications-of-the-helical-heart-in-congenital-heart-defects
#23
REVIEW
Antonio F Corno, Mladen J Kocica
The anatomic and functional observations made by Francisco Torrent-Guasp, in particular his discovery of the helical ventricular myocardial band (HVMB), have challenged what has been taught to cardiologists and cardiac surgeons over centuries. A literature debate is ongoing, with interdependent articles and comments from supporters and critics. Adequate understanding of heart structure and function is obviously indispensable for the decision-making process in congenital heart defects. The HVMB described by Torrent-Guasp and the potential impact on the understanding and treatment of congenital heart defects has been analyzed in the following settings: embryology, ventriculo-arterial discordance (transposition of great arteries), Ebstein's anomaly, pulmonary valve regurgitation after repair of tetralogy of Fallot, Ross operation, and other congenital heart defects...
2007: Seminars in Thoracic and Cardiovascular Surgery. Pediatric Cardiac Surgery Annual
https://read.qxmd.com/read/17433993/the-helical-ventricular-myocardial-band-of-torrent-guasp
#24
REVIEW
Mladen J Kocica, Antonio F Corno, Vesna Lackovic, Vladimir I Kanjuh
We live in an era of substantial progress in understanding myocardial structure and function at genetic, molecular, and microscopic levels. Yet, ventricular myocardium has proven remarkably resistant to macroscopic analyses of functional anatomy. Pronounced and practically indefinite global and local structural anisotropy of its fibers and other ventricular wall constituents produces electrical and mechanical properties that are nonlinear, anisotropic, time varying, and spatially inhomogeneous. The helical ventricular myocardial band of Torrent-Guasp is a revolutionary new concept in understanding global, 3-dimensional, functional architecture of the ventricular myocardium...
2007: Seminars in Thoracic and Cardiovascular Surgery. Pediatric Cardiac Surgery Annual
https://read.qxmd.com/read/17350851/analysis-of-the-fiber-architecture-of-the-heart-by-quantitative-polarized-light-microscopy-accuracy-limitations-and-contribution-to-the-study-of-the-fiber-architecture-of-the-ventricles-during-fetal-and-neonatal-life
#25
JOURNAL ARTICLE
Pierre-Simon Jouk, Ayman Mourad, Vuk Milisic, Gabrielle Michalowicz, Annie Raoult, Denis Caillerie, Yves Usson
OBJECTIVE: To address the advantages and drawbacks of quantitative polarized light microscopy for the study of myocardial cell orientation and to identify its contribution in the field. METHODS: Quantitative polarized light microscopy allows to measure the orientation of myocardial fibers into the ventricular mass. For each pixel of a horizontal section, this orientation is the mean value of the directions of all myosin filaments contained in the thickness of the section for each pixel of the section and is accounted for by two angles, the azimuth angle, which is the angle of the fiber in the plane of the section, and the elevation angle, which measures the way the fiber escapes from the section...
May 2007: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/17078262/-the-left-ventricular-reconstructive-surgery-at-the-origin-of-the-treatment-of-cardiac-insufficiency
#26
JOURNAL ARTICLE
T M Joudinaud, E Flecher, S A Tahta, U Hvass, C Duran
The surgical method of ventricular reconstruction described by Dor is recalled with the clinical report of a patient who presented a ventricular aneurysm. The left ventricular reconstructive surgery is based on an anatomical design of the heart described by Torrent-Guasp, where the normal orientation of the left ventricular muscle fibers, oblique in direction, is found parallel with the base of the heart at the time of ventricular dilation. By giving again an elliptic form to the left ventricle, the left ventricular reconstructive surgery improves the cardiac function of the patient who developed a bulky aneurysm after an infarction...
October 2006: Annales de Cardiologie et D'angéiologie
https://read.qxmd.com/read/16567105/active-myocyte-shortening-during-the-isovolumetric-relaxation-phase-of-diastole-is-responsible-for-ventricular-suction-systolic-ventricular-filling
#27
JOURNAL ARTICLE
Gerald D Buckberg, Manuel Castellá, Morteza Gharib, Saleh Saleh
OBJECTIVE: To study the 'isovolumetric relaxation' phase of rapid ventricular filling by analysis of the shortening of cardiac muscle in the endocardial and epicardial segments of the left ventricle in the dual helical model of the ventricular band, described by Torrent-Guasp. METHODS: In 10 pigs (27-82 kg), temporal shortening by sonomicrometer crystals was recorded while recording ECG, and measuring intraventricular pressure and dP/dt with Millar pressure transducers...
April 2006: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/16567104/structure-function-interface-with-sequential-shortening-of-basal-and-apical-components-of-the-myocardial-band
#28
JOURNAL ARTICLE
Gerald D Buckberg, Manuel Castellá, Morteza Gharib, Saleh Saleh
OBJECTIVE: To study the sequential shortening of Torrent-Guasp's 'rope-heart model' of the muscular band, and analyze the structure-function relationship of basal loop wrapping the outer right and left ventricles, around the inner helical apical loop containing reciprocal descending and ascending spiral segments. METHODS: In 24 pigs (27-82 kg), temporal shortening by sonomicrometer crystals was recorded. The ECG evaluated rhythm, and Millar pressure transducers measured intraventricular pressure and dP/dt...
April 2006: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/16567102/the-helical-ventricular-myocardial-band-of-torrent-guasp-potential-implications-in-congenital-heart-defects
#29
REVIEW
Antonio F Corno, Mladen J Kocica, Francisco Torrent-Guasp
The new concepts of cardiac anatomy and physiology, based on the observations made by Francisco Torrent-Guasp's discovery of the helical ventricular myocardial band, can be useful in the context of the surgical strategies currently used to manage patients with congenital heart defects. The potential impact of the Torrent-Guasp's Heart on congenital heart defects have been analyzed in the following settings: ventriculo-arterial discordance (transposition of the great arteries), double (atrio-ventricular and ventriculo-arterial) discordance (congenitally corrected transposition of the great arteries), Ebstein's anomaly, pulmonary valve regurgitation after repair of tetralogy of Fallot, Ross operation, and complex intra-ventricular malformations...
April 2006: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/16564699/torrent-guasp-s-anatomical-legacy
#30
EDITORIAL
Donald N Ross
No abstract text is available yet for this article.
April 2006: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/16564179/the-sequence-of-regional-ventricular-motion
#31
JOURNAL ARTICLE
Manel Ballester-Rodés, Albert Flotats, Francisco Torrent-Guasp, Ignasi Carrió-Gasset, Manel Ballester-Alomar, Francesc Carreras, Ana Ferreira, Jagat Narula
OBJECTIVE: The chronology of electrical events that mechanically activate the myocardium has been described as initiating at the level of the septum, spreading to the apex, then to the bodies of both ventricles and eventually to the base of the heart (apex-to base activation). It has recently been suggested that the myocardium is a single muscular band that conforms a double-loop helicoid. Contraction of the myocardium would follow the trajectory of the muscular fibers that originate at the pulmonary artery towards the body of the left ventricle and to the aorta (base-to apex contraction)...
April 2006: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/16563790/the-helical-ventricular-myocardial-band-global-three-dimensional-functional-architecture-of-the-ventricular-myocardium
#32
REVIEW
Mladen J Kocica, Antonio F Corno, Francesc Carreras-Costa, Manel Ballester-Rodes, Mark C Moghbel, Clotario N C Cueva, Vesna Lackovic, Vladimir I Kanjuh, Francisco Torrent-Guasp
We are currently witnessing the advent of new diagnostic tools and therapies for heart diseases, but, without serious scientific consensus on fundamental questions about normal and diseased heart structure and function. During the last decade, three successive, international, multidisciplinary symposia were organized in order to setup fundamental research principles, which would allow us to make a significant step forward in understanding heart structure and function. Helical ventricular myocardial band of Torrent-Guasp is the revolutionary new concept in understanding global, three-dimensional, functional architecture of the ventricular myocardium...
April 2006: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/16563789/ontogenetic-development-of-the-helical-heart-concepts-and-facts
#33
REVIEW
Jörg Männer
The structural and functional organization of the ventricular myocardial mass is a controversial matter that cannot be resolved by anatomical studies alone. Therefore, other approaches such as investigations of the ontogenetic development of the ventricular myocardium might help to resolve controversies about its structural and functional organization. It has recently been proposed that the spatial orientation of Torrent-Guasp's ventricular myocardial band model (basal and apical loops) might be the mature morphological correlate of twists and torsions of the embryonic heart loop...
April 2006: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/16563788/morphological-and-functional-evidences-of-the-helical-heart-from-non-invasive-cardiac-imaging
#34
REVIEW
Francesc Carreras, Manel Ballester, Sandra Pujadas, Ruben Leta, Guillem Pons-Llado
The non-invasive study of cardiac mechanics has been improved after the recent introduction of advanced magnetic resonance and echocardiographic imaging techniques. Tagged and diffusion-sensitive cardiac magnetic resonance allows the study of myocardial torsion dynamics as well as the anatomical disposition of myocardial fibers. Local myocardial strain and synchronicity of myocardial contraction can also be determined with Doppler tissue imaging (DTI) echocardiography. Published results with these techniques demonstrate a mechanical behavior that is a consequence of a myocardial helical fiber orientation and strongly support the evidence of the double-loop single muscular band model described by Torrent-Guasp...
April 2006: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/15691671/architecture-must-document-functional-evidence-to-explain-the-living-rhythm
#35
REVIEW
Gerald D Buckberg
The central theme of surgical procedures is to interact structure and function. Two reviews of architecture by Torrent-Guasp and Lunkenheimer provide anatomic observations, and then only deduce, rather than test and verify functional relationships. Lunkenheimer previously showed the reciprocal helical configuration of the connective tissue scaffold, a weave-like network that may be the lattice for the descending and ascending segments of Torrent-Guasp's apical loop formed from the helical band. Lunkenheimer stresses cardiac development from a blood vessel, and exposes the need to disregard heart formation by a band that develops between the pulmonary artery and aorta...
February 2005: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/15691670/towards-new-understanding-of-the-heart-structure-and-function
#36
REVIEW
Francisco Torrent-Guasp, Mladen J Kocica, Antonio F Corno, Masashi Komeda, Francesc Carreras-Costa, A Flotats, Juan Cosin-Aguillar, Han Wen
Structure and function in any organ are inseparable categories, both in health and disease. Whether we are ready to accept, or not, many questions in cardiovascular medicine are still pending, due to our insufficient insight in the basic science. Even so, any new concept encounters difficulties, mainly arising from our inert attitude, which may result either in unjustified acceptance or denial. The ventricular myocardial band concept, developed over the last 50 years, has revealed unavoidable coherence and mutual coupling of form and function in the ventricular myocardium...
February 2005: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/15466651/left-ventricular-form-and-function-scientific-priorities-and-strategic-planning-for-development-of-new-views-of-disease
#37
Gerald D Buckberg, Myron L Weisfeldt, Manel Ballester, Raphael Beyar, Daniel Burkhoff, H Cecil Coghlan, Mark Doyle, Neal D Epstein, Morteza Gharib, Ray E Ideker, Neil B Ingels, Martin M LeWinter, Andrew D McCulloch, Gerald M Pohost, Leslie J Reinlib, David J Sahn, George Sopko, Francis G Spinale, Henry M Spotnitz, Francisco Torrent-Guasp, Edward P Shapiro
No abstract text is available yet for this article.
October 5, 2004: Circulation
https://read.qxmd.com/read/15019664/systolic-ventricular-filling
#38
JOURNAL ARTICLE
Francisco Torrent-Guasp, Mladen J Kocica, Antonio Corno, Masashi Komeda, James Cox, A Flotats, Manel Ballester-Rodes, Francesc Carreras-Costa
The evidence of the ventricular myocardial band (VMB) has revealed unavoidable coherence and mutual coupling of form and function in the ventricular myocardium, making it possible to understand the principles governing electrical, mechanical and energetical events within the human heart. From the earliest Erasistratus' observations, principal mechanisms responsible for the ventricular filling have still remained obscured. Contemporary experimental and clinical investigations unequivocally support the attitude that only powerful suction force, developed by the normal ventricles, would be able to produce an efficient filling of the ventricular cavities...
March 2004: European Journal of Cardio-thoracic Surgery
https://read.qxmd.com/read/11807736/the-structure-and-function-of-the-helical-heart-and-its-buttress-wrapping-vii-critical-importance-of-septum-for-right-ventricular-function
#39
REVIEW
G D Buckberg, H C Coghlan, J I Hoffman, F Torrent-Guasp
The macroscopic structure of the right ventricle includes a transverse basal loop for the free wall, and oblique septal components, originating from the descending and ascending segments of the apical loop. Data is presented that determines why right ventricular function is related principally to intraventricular septal function, and why right ventricular failure is magnified by septal stunning caused by poor myocardial protection. The background of this architectural/functional change can explain normal right ventricular function, the relationship of right ventricular performance to pulmonary vascular resistance, experimental studies that characterize right ventricular performance after architectural free wall ablation, right ventricular disconnection, right coronary occlusion, and free wall replacement...
October 2001: Seminars in Thoracic and Cardiovascular Surgery
https://read.qxmd.com/read/11807735/the-structure-and-function-of-the-helical-heart-and-its-buttress-wrapping-vi-geometric-concepts-of-heart-failure-and-use-for-structural-correction
#40
REVIEW
G D Buckberg, H C Coghlan, F Torrent-Guasp
The macroscopic basis for congestive heart failure is defined as conversion of a helical heart, whereby the apical loop fiber angle orientation that produces a 60% ejection fraction becomes more transverse to develop a spheric configuration. The geometric consequence is flattening of the apical loop architecture, so that the 15% shortening can produce only 30% ejection fraction. The fundamental shape change is alteration of normal relationships between the transverse basal loop and oblique apical loop, to make the apical loop become more basal through more transverse fiber orientation...
October 2001: Seminars in Thoracic and Cardiovascular Surgery
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