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Torrent guasp

David H MacIver, Robert S Stephenson, Bjarke Jensen, Peter Agger, Damián Sánchez-Quintana, Jonathan C Jarvis, John B Partridge, Robert H Anderson
The concept of the 'unique myocardial band', which proposes that the ventricular myocardial cone is arranged like skeletal muscle, provides an attractive framework for understanding haemodynamics. The original idea was developed by Francisco Torrent-Guasp. Using boiled hearts and blunt dissection, Torrent-Guasp created a single band of ventricular myocardium extending from the pulmonary trunk to the aortic root, with the band thus constructed encircling both ventricular cavities. Cooked hearts can, however, be dissected in many ways...
January 1, 2018: European Journal of Cardio-thoracic Surgery
Julien I E Hoffman
Ventricular twisting, essential for cardiac function, is attributed to the contraction of myocardial helical fibers. The exact relationship between ventricular anatomy and function remains to be determined, but one commonly used explanatory model is the helical ventricular myocardial band (HVMB) model of Torrent-Guasp. This model has been successful in explaining many aspects of ventricular function, (Torrent-Guasp et al. Eur. J. Cardiothorac. Surg., 25, 376, 2004; Buckberg et al. Eur. J. Cardiothorac. Surg...
September 2017: Physiological Reports
P P Lunkenheimer, K Redmann, C W Cryer, K D Richter, P Niederer, W F Whimster, F Torrent-Guasp
The literature on the morphology of the heart is reviewed within the context of recent histological findings. There is strong evidence for a dualistic myocardial function, whereby both ventricular constricting and expanding forces are supposed to act synchronously although with variable effect over the heart cycle.The morphological basis of this dualistic myocardial function is the contorted rope-like structure worn into the bulk of the heart muscle. Opinions are divided about the invasiveness of blunt preparation on the heat denatured heart by which the fascicular architecture is carved out of the muscle...
January 1, 1994: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
Gerald D Buckberg, Julien I E Hoffman, H Cecil Coghlan, Navin C Nanda
The heart's structure-function relationships explain normal cardiac dynamics and clarify how they are disrupted by disease. For 500 years, anatomists described circumferential and helical cardiac fibres, yet disagreed about their relationships. One current model is attributed to Torrent Guasp who described functional pathways, the helical ventricular myocardial band (HVMB) with two interconnected loops: an outer basal loop with transverse fibres surrounds an inner apical helical loop that is composed of oblique descending and ascending segments that create a conical apical vortex...
April 2015: European Journal of Cardio-thoracic Surgery
Yasunobu Hayabuchi, Miho Sakata, Shoji Kagami
BACKGROUND: The purpose of this study was to assess the feasibility of morphological and functional evaluation of the helical ventricular myocardial band using standard echocardiographic images. METHODS: Echocardiographic data were obtained from 132 normal children. We attempted to identify the echogenic bright line serving as the boundary between the ascending and descending segments in the ventricular septum, and between the left and ascending segments in the left ventricular inferior wall in the helical myocardial band model proposed by Torrent-Guasp...
February 2015: Echocardiography
Ferran Poveda, Debora Gil, Enric Martí, Albert Andaluz, Manel Ballester, Francesc Carreras
INTRODUCTION AND OBJECTIVES: Deeper understanding of the myocardial structure linking the morphology and function of the heart would unravel crucial knowledge for medical and surgical clinical procedures and studies. Several conceptual models of myocardial fiber organization have been proposed but the lack of an automatic and objective methodology prevented an agreement. We sought to deepen this knowledge through advanced computer graphical representations of the myocardial fiber architecture by diffusion tensor magnetic resonance imaging...
October 2013: Revista Española de Cardiología
Sergey F Pravdin, Vitaly I Berdyshev, Alexander V Panfilov, Leonid B Katsnelson, Olga Solovyova, Vladimir S Markhasin
BACKGROUND: One of the main factors affecting propagation of electrical waves and contraction in ventricles of the heart is anisotropy of cardiac tissue. Anisotropy is determined by orientation of myocardial fibres. Determining fibre orientation field and shape of the heart is important for anatomically accurate modelling of electrical and mechanical function of the heart. The aim of this paper is to introduce a theoretical rule-based model for anatomy and fibre orientation of the left ventricle (LV) of the heart and to compare it with experimental data...
2013: Biomedical Engineering Online
G Truscelli, N Galea, F Barillà, P Pellicori, F Toscano, C Gaudio, I Carbone, C Torromeo
Myocardial perforation is a complication following pacemaker implantation that may cause cardiac tamponade. We present an original case of myocardial lead perforation not complicated by acute cardiac tamponade. The patient with an acute myocardial infarct had a high bleeding risk both in the acute phase of lead insertion (anticoagulant and triple platelet anti-aggregation therapy) and after few days, the percutaneous extraction lead for the double platelet antiaggregant therapy. Torrent-Guasp's theory is considered for explaining the clinical course of patient...
June 2011: European Review for Medical and Pharmacological Sciences
Yoichiro Kusakari, Chun-Yang Xiao, Nathan Himes, Stuart D Kinsella, Masaya Takahashi, Anthony Rosenzweig, Takashi Matsui
Left ventricular (LV) remodeling following myocardial infarction (MI) is considered to contribute to cardiac dysfunction. Though myofiber organization is a key component of cardiac structure, functional and anatomical features of injured myofiber during LV remodeling have not been fully defined. We investigated myocyte injury after acute MI in a mouse model. Mice were subjected to surgical coronary occlusion/reperfusion by left anterior descending coronary artery (LAD) ligation and examined at 1 week and 4 weeks post-MI...
December 2009: Interactive Cardiovascular and Thoracic Surgery
Juan A Cosín Aguilar, Amparo Hernándiz Martínez, M Teresa Tuzón Segarra, Jaime Agüero Ramón-Llin, Francisco Torrent-Guasp
INTRODUCTION AND OBJECTIVES: Left ventricular filling begins in the ventricular isovolumic relaxation phase. According to the Torrent-Guasp myocardial band theory, this phase results from the contraction of the final portion of the myocardial band: the ascending segment of the apical loop. The objectives were to study the myocardial mechanisms influencing transmitral flow during early diastole and to determine whether the rapid ventricular filling phase involves contraction or relaxation...
April 2009: Revista Española de Cardiología
Changqing Gao, Weihua Ye, Libing Li, Tao Zhang, Chonglei Ren, Liuquan Cheng, Junlan Yan
OBJECTIVE: The 3-dimensional arrangement of the ventricular mass remains controversial. In this study, we used magnetic resonance diffusion tensor imaging (MRDTI) in an attempt to determine whether the ventricular mass is arranged in the form of a helical ventricular myocardial band (HVMB) and what the geometrical features of the HVMB are in postmortem pig hearts. MATERIALS AND METHODS: Ten pig hearts were harvested from the slaughterhouse, and their whole-body MR images were obtained...
April 2009: Heart Surgery Forum
V V Mazur, K A Abramova, N D Bazhenov, E S Mazur
Examination of 92 patients with grade I-II hypertensive disease showed that the emergence and enhancement of left ventricular concentric hypertrophy cause no changes in the volume of heart cavities and ventricular systolic function but result in the lengthening of the left ventricle and the diminishing of the right ventricle. These findings are interpreted in terms of Torrent-Guasp's theory of monolayer spiral ventricular structure.
2009: Klinicheskaia Meditsina
Gerald Buckberg, Aman Mahajan, Saleh Saleh, Julien I E Hoffman, Cecil Coghlan
OBJECTIVE: Understanding cardiac function requires knowledge of the architecture responsible for the normal actions of emptying and filling. Newer imaging methods are surveyed to characterize directional (narrowing, shortening, lengthening, and widening) and twisting motions. METHODS: These movements are defined and then compared with a spectrum of models to introduce a useful "functional anatomy" that explains cardiac spatial and temporal relationships. The sequential nature of normal contraction differs from a synchronous beat...
September 2008: Journal of Thoracic and Cardiovascular Surgery
Manel Ballester, Ana Ferreira, Francesc Carreras
Francisco (Paco) Torrent-Guasp, a Spanish cardiologist working in De'nia, Alicante, discovered that the complex structure of the ventricular myocardium is due to a double-loop helical orientation of a single muscular band that extends from the pulmonary artery to the aorta, with a 180-degree twist in its middle part. He predicted the twist-untwist motion of the ventricles and suggested that this is due to agonist-antagonist mechanics of the ventricular band segments.
July 2008: Heart Failure Clinics
Theo Kofidis, Knut Müller-Stahl, Axel Haverich
The restoration or de novo engineering of heart structures poses a challenge because of the unique structure and physical properties of the heart. The heart is a heterogeneous, complex helical structure with asymmetric and anisotropic features. Hence, it is variably built and consists of spiraling muscle bands (first described by Torrent-Guasp), valves, coronary vessels, and a conduction system. Therefore, successful construction of muscular or valvular grafts needs to meet specific prerequisites, such as mechanical stability, optimal porosity, and contractile function...
2007: Methods in Molecular Medicine
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
Erle H Austin
No abstract text is available yet for this article.
2007: Seminars in Thoracic and Cardiovascular Surgery. Pediatric Cardiac Surgery Annual
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
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
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
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