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Article: Jean-Baptiste Say et les siens

Lutfalla, Michel / Say, Jean-Baptiste

Revue d'économie politique Vol. 89, No. 3 , p. 389-407

une famille d'économistes

1979 Volume 89, Issue 3, Page(s) 389–407

Author's details	Michel Lutfalla
Publisher	Dalloz-Sirey
Publishing place	Paris
Document type	Article
ZDB-ID	241473-9
Database	ECONomics Information System

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Article: Jean-Baptiste Say, 1767 - 1832, le fondateur

Lutfalla, Michel

L' économie politique en France au XIXe siècle S. 13-31

1991

Author's details	par Michel Lutfalla
Keywords	50 ; Say
Language	French
Publisher	Economica
Publishing place	Paris
Document type	Article
ISBN	2-7178-2062-0 ; 978-2-7178-2062-1
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Article ; Online: Surgical treatment of marginal sinus dural arteriovenous fistula: a narrative review.

Peeters, Jean-Baptiste / Bojanowski, Michel W

Neuro-Chirurgie

2024 Volume 70, Issue 3, Page(s) 101534

Abstract: Background: Dural arteriovenous fistulas of the marginal sinus (DAVFms) are uncommon and complex, with varied symptoms. Their complexity is heightened by the region's dense anastomotic network, posing risks for endovascular treatment. Surgical ... ...

Abstract	Background: Dural arteriovenous fistulas of the marginal sinus (DAVFms) are uncommon and complex, with varied symptoms. Their complexity is heightened by the region's dense anastomotic network, posing risks for endovascular treatment. Surgical intervention can be effective, but this depends on thorough pre-operative understanding and optimal intra-operative visualization of the fistula. Objective: To review the relevant anatomy, presentation patterns of DAVFms, and provide insights for surgical treatment. Methods: Recent literature on DAVFms was reviewed, and three surgical cases are discussed to highlight treatment principles. Results: The symptoms of a DAVFms vary depending on its venous drainage pattern. Drainage may be either ascending towards the cranial compartment or descending towards the spinal canal. Patients suffering from DAVFms may experience hemorrhage, particularly when venous drainage is directed upwards. Congestive symptoms of the spinal cord or brainstem can occur in cases of downward venous drainage. Compared to the endovascular approach, open surgery has a higher success rate in obliterating the fistula and yields better outcomes in cases of perimedullary venous drainage. Achieving surgical success necessitates thorough preoperative evaluation and adequate surgical exposure. Brainstem hyperintensity observed on T2-weighted MRI scans is linked to a poorer prognosis for recovery. Conclusion: Treating complex DAVFms often requires surgery, as endovascular methods may not be feasible. Successful surgery hinges on a precise understanding of the fistula's venous architecture and its spatial relationships, assessed using digital substraction angiography (DSA), angio-MRI, and angio-CT. Optimal intraoperative exposure is crucial for effective surgery.
Language	English
Publishing date	2024-01-31
Publishing country	France
Document type	Journal Article ; Review
ZDB-ID	207146-0
ISSN	1773-0619 ; 0028-3770 ; 0150-9586
ISSN (online)	1773-0619
ISSN	0028-3770 ; 0150-9586
DOI	10.1016/j.neuchi.2024.101534
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Article ; Online: William Harvey réinterprété à la lumière de l’évolution des espèces (I) - Comment et pourquoi la phylogenèse circulatoire s’intègre dans l’évolution des espèces.

Michel, Jean-Baptiste

Medecine sciences : M/S

2020 Volume 36, Issue 11, Page(s) 997–1003

Abstract: In this first part we describe the different steps of the evolution of species and the circulatory modifications, which accompany it. From the open circulation in invertebrates, via the in-series closed circulation in fish, to the in-parallel closed ... ...

Title translation	William Harvey reinterpreted in the light of species evolution (I) - How and why circulation phylogenesis integrates itself within species evolution.
Abstract	In this first part we describe the different steps of the evolution of species and the circulatory modifications, which accompany it. From the open circulation in invertebrates, via the in-series closed circulation in fish, to the in-parallel closed circulation in mammals, the local ability to vasodilate in relation to the specific metabolic demand of territorial activity was the driving force for circulatory evolution. This capacity was achieved by the progressive muscularization of small arteries, generating frictional forces, which systemically determine high arterial pressure, and locally determine active vasodilation via the inhibition of vasomotor tone. This determinism differentially impacts the small resistance arteries, which generate blood pressure, and the large conductance arteries, which support the tensional stress generated by the blood pressure.
MeSH term(s)	Adaptation, Biological/genetics ; Adaptation, Biological/physiology ; Animals ; Biological Evolution ; Biology/history ; Blood Circulation/genetics ; Blood Circulation/physiology ; Earth, Planet ; Genetic Speciation ; History, 16th Century ; History, 17th Century ; History, 18th Century ; History, 19th Century ; History, 20th Century ; History, 21st Century ; Humans ; Models, Biological ; Phylogeny ; Species Specificity
Language	French
Publishing date	2020-11-05
Publishing country	France
Document type	Historical Article ; Journal Article ; Review
ZDB-ID	632733-3
ISSN	1958-5381 ; 0767-0974
ISSN (online)	1958-5381
ISSN	0767-0974
DOI	10.1051/medsci/2020170
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Article ; Online: William Harvey réinterprété à la lumière de l’évolution des espèces (II) - Conséquences physiologiques et en pathologie de l’évolution de la circulation.

Michel, Jean-Baptiste

Medecine sciences : M/S

2020 Volume 36, Issue 11, Page(s) 1004–1011

Abstract: In the first part of this review [22], "How and why circulatory phylogenesis fits into the evolution of species", we explained that the acquisition of a high-pressure arterial sector, as originally described by William Harvey in 1619, was the consequence, ...

Title translation	William Harvey reinterpreted in the light of species evolution (II) - Physiological and pathological consequences of the evolution of circulation.
Abstract	In the first part of this review [22], "How and why circulatory phylogenesis fits into the evolution of species", we explained that the acquisition of a high-pressure arterial sector, as originally described by William Harvey in 1619, was the consequence, during evolution, of the appearance of vasomotor tone, inducing systemic friction forces (peripheral resistances), which, regulated locally (by vasodilatation), allows to adapt metabolic needs to the demand of functionally active territories. In this second part, we will try to understand how this phylogenesis directly influences the physiology, then the pathologies of the circulatory system in humans which are largely predominant, but not exclusively.
MeSH term(s)	Animals ; Biological Evolution ; Blood Circulation/physiology ; Cardiovascular Diseases/etiology ; Cardiovascular Diseases/pathology ; Cardiovascular Diseases/physiopathology ; Hematologic Diseases/etiology ; Hematologic Diseases/pathology ; Hematologic Diseases/physiopathology ; History, 15th Century ; History, 16th Century ; History, 17th Century ; History, 18th Century ; History, 19th Century ; History, 20th Century ; History, 21st Century ; Humans ; Hypertension/etiology ; Hypertension/physiopathology ; Models, Biological ; Phylogeny
Language	French
Publishing date	2020-11-05
Publishing country	France
Document type	Historical Article ; Journal Article ; Review
ZDB-ID	632733-3
ISSN	1958-5381 ; 0767-0974
ISSN (online)	1958-5381
ISSN	0767-0974
DOI	10.1051/medsci/2020171
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Article ; Online: Phylogenic Determinants of Cardiovascular Frailty, Focus on Hemodynamics and Arterial Smooth Muscle Cells.

Michel, Jean-Baptiste

Physiological reviews

2020 Volume 100, Issue 4, Page(s) 1779–1837

Abstract: The evolution of the circulatory system from invertebrates to mammals has involved the passage from an open system to a closed in-parallel system via a closed in-series system, accompanying the increasing complexity and efficiency of life's biological ... ...

Abstract	The evolution of the circulatory system from invertebrates to mammals has involved the passage from an open system to a closed in-parallel system via a closed in-series system, accompanying the increasing complexity and efficiency of life's biological functions. The archaic heart enables pulsatile motion waves of hemolymph in invertebrates, and the in-series circulation in fish occurs with only an endothelium, whereas mural smooth muscle cells appear later. The present review focuses on evolution of the circulatory system. In particular, we address how and why this evolution took place from a closed, flowing, longitudinal conductance at low pressure to a flowing, highly pressurized and bifurcating arterial compartment. However, although arterial pressure was the latest acquired hemodynamic variable, the general teleonomy of the evolution of species is the differentiation of individual organ function, supported by specific fueling allowing and favoring partial metabolic autonomy. This was achieved via the establishment of an active contractile tone in resistance arteries, which permitted the regulation of blood supply to specific organ activities via its localized function-dependent inhibition (active vasodilation). The global resistance to viscous blood flow is the peripheral increase in frictional forces caused by the tonic change in arterial and arteriolar radius, which backscatter as systemic arterial blood pressure. Consequently, the arterial pressure gradient from circulating blood to the adventitial interstitium generates the unidirectional outward radial advective conductance of plasma solutes across the wall of conductance arteries. This hemodynamic evolution was accompanied by important changes in arterial wall structure, supported by smooth muscle cell functional plasticity, including contractility, matrix synthesis and proliferation, endocytosis and phagocytosis, etc. These adaptive phenotypic shifts are due to epigenetic regulation, mainly related to mechanotransduction. These paradigms actively participate in cardio-arterial pathologies such as atheroma, valve disease, heart failure, aneurysms, hypertension, and physiological aging.
MeSH term(s)	Cardiovascular Diseases/genetics ; Cardiovascular Physiological Phenomena/genetics ; Genetic Predisposition to Disease ; Hemodynamics ; Humans ; Muscle, Smooth, Vascular/cytology
Language	English
Publishing date	2020-01-30
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Review
ZDB-ID	209902-0
ISSN	1522-1210 ; 0031-9333
ISSN (online)	1522-1210
ISSN	0031-9333
DOI	10.1152/physrev.00022.2019
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Article ; Online: Are telocytes related to maintenance of vascular homeostasis in normal and pathological aorta?

Borges, Luciano Figueiredo / Falcão, Rafael Souza Pereira / Taboga, Sebastião Roberto / Gutierrez, Paulo Sampaio / Michel, Jean-Baptiste

Cardiovascular pathology : the official journal of the Society for Cardiovascular Pathology

2024 Volume 70, Page(s) 107617

Abstract: The telocyte (TC) is a new interstitial cell type described in a wide variety of organs and loose connective tissues around small vessels, but its presence in large arteries remains unexplored. TCs have small cell bodies and remarkably thin, long, ... ...

Abstract	The telocyte (TC) is a new interstitial cell type described in a wide variety of organs and loose connective tissues around small vessels, but its presence in large arteries remains unexplored. TCs have small cell bodies and remarkably thin, long, moniliform processes called telopods (Tps). Using transmission electron microscopy and immunofluorescence, we identified TCs in normal human thoracic aortas and in those with aneurysm or acute dissection (TAAD). In normal aortas the TCs were distributed throughout the connective tissue of the adventitial layer, in its innermost portion and at the zone of transition with the medial layer, with their long axes oriented parallel to the external elastic lamellae, forming a three-dimensional network, without prevalence in the media layer. In contrast, TAAD TCs were present in the medial layer and in regions of neovascularization. The most important feature of the adventitia of diseased aortas was the presence of numerous contacts between TCs and stem cells, including vascular progenitor cells. Although the biologically functional correlations need to be elucidated, the morphological observations presented here provide strong evidence of the involvement of TCs in maintaining vascular homeostasis in pathological situations of tissue injury.
Language	English
Publishing date	2024-02-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	1134600-0
ISSN	1879-1336 ; 1054-8807
ISSN (online)	1879-1336
ISSN	1054-8807
DOI	10.1016/j.carpath.2024.107617
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Article ; Online: From organic and inorganic phosphates to valvular and vascular calcifications.

Bäck, Magnus / Michel, Jean-Baptiste

Cardiovascular research

2021 Volume 117, Issue 9, Page(s) 2016–2029

Abstract: Calcification of the arterial wall and valves is an important part of the pathophysiological process of peripheral and coronary atherosclerosis, aortic stenosis, ageing, diabetes, and chronic kidney disease. This review aims to better understand how ... ...

Abstract	Calcification of the arterial wall and valves is an important part of the pathophysiological process of peripheral and coronary atherosclerosis, aortic stenosis, ageing, diabetes, and chronic kidney disease. This review aims to better understand how extracellular phosphates and their ability to be retained as calcium phosphates on the extracellular matrix initiate the mineralization process of arteries and valves. In this context, the physiological process of bone mineralization remains a human model for pathological soft tissue mineralization. Soluble (ionized) calcium precipitation occurs on extracellular phosphates; either with inorganic or on exposed organic phosphates. Organic phosphates are classified as either structural (phospholipids, nucleic acids) or energetic (corresponding to phosphoryl transfer activities). Extracellular phosphates promote a phenotypic shift in vascular smooth muscle and valvular interstitial cells towards an osteoblast gene expression pattern, which provokes the active phase of mineralization. A line of defense systems protects arterial and valvular tissue calcifications. Given the major roles of phosphate in soft tissue calcification, phosphate mimetics, and/or prevention of phosphate dissipation represent novel potential therapeutic approaches for arterial and valvular calcification.
MeSH term(s)	Animals ; Arteries/drug effects ; Arteries/metabolism ; Arteries/pathology ; Bone Density Conservation Agents/therapeutic use ; Calcinosis/drug therapy ; Calcinosis/metabolism ; Calcinosis/pathology ; Chelating Agents/therapeutic use ; Heart Valve Diseases/drug therapy ; Heart Valve Diseases/metabolism ; Heart Valve Diseases/pathology ; Heart Valves/drug effects ; Heart Valves/metabolism ; Heart Valves/pathology ; Humans ; Organophosphates/metabolism ; Osteogenesis/drug effects ; Phosphates/metabolism ; Vascular Calcification/drug therapy ; Vascular Calcification/metabolism ; Vascular Calcification/pathology
Chemical Substances	Bone Density Conservation Agents ; Chelating Agents ; Organophosphates ; Phosphates
Language	English
Publishing date	2021-02-12
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Review
ZDB-ID	80340-6
ISSN	1755-3245 ; 0008-6363
ISSN (online)	1755-3245
ISSN	0008-6363
DOI	10.1093/cvr/cvab038
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Article ; Online: Évaluation du suivi ophtalmologique des patients de plus de 65 ans en médecine générale.

Burel, Clara / Chapelet, Guillaume / Berrut, Gilles / Weber, Michel / Ducloyer, Jean-Baptiste

Geriatrie et psychologie neuropsychiatrie du vieillissement

2024 Volume 21, Issue 4, Page(s) 419–426

Abstract: Visual disorders are often under-diagnosed and under-treated in older patients. The main objective was to evaluate the percentage of patients having an ophthalmological follow-up corresponding to the recommendations of the Syndicat national des ... ...

Title translation	Evaluation of ophthalmological follow-up of patients over 65 years old in primary care.
Abstract	Visual disorders are often under-diagnosed and under-treated in older patients. The main objective was to evaluate the percentage of patients having an ophthalmological follow-up corresponding to the recommendations of the Syndicat national des ophtalmologistes de France (SNOF). This prospective observational multicentre study included all patients aged 65 years or older presenting to their general practitioner in two medical practices from May to October 2021. Of the 113 patients included, 86 (76,1 %) had adequate ophthalmological follow-up, 14 consulted an ophthalmologist, and a therapeutic decision was made for nine patients. Follow-up of patients was generally as recommended. Screening for visual disorders for patients with no recent follow-up was beneficial. This screening must be integrated into a global approach, as the Integrated Care for Older People (ICOPE) of the World Health Organization (WHO), in order to be more relevant and effective.
MeSH term(s)	Humans ; Aged ; Follow-Up Studies ; Prospective Studies ; France ; Vision Disorders ; Primary Health Care
Language	French
Publishing date	2024-01-25
Publishing country	France
Document type	Observational Study ; Multicenter Study ; English Abstract ; Journal Article
ISSN	2115-7863
ISSN (online)	2115-7863
DOI	10.1684/pnv.2023.1115
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Article ; Online: Hemodynamic factors of spontaneous vertebral artery dissecting aneurysms assessed with numerical and deep learning algorithms: Role of blood pressure and asymmetry.

Martin, Tristan / El Hage, Gilles / Chaalala, Chiraz / Peeters, Jean-Baptiste / Bojanowski, Michel W

Neuro-Chirurgie

2024 Volume 70, Issue 3, Page(s) 101519

Abstract: Background and objectives: The pathophysiology of spontaneous vertebral artery dissecting aneurysms (SVADA) is poorly understood. Our goal is to investigate the hemodynamic factors contributing to their formation using computational fluid dynamics (CFD) ...

Abstract	Background and objectives: The pathophysiology of spontaneous vertebral artery dissecting aneurysms (SVADA) is poorly understood. Our goal is to investigate the hemodynamic factors contributing to their formation using computational fluid dynamics (CFD) and deep learning algorithms. Methods: We have developed software that can use patient imagery as input to recreate the vertebrobasilar arterial system, both with and without SVADA, which we used in a series of three patients. To obtain the kinematic blood flow data before and after the aneurysm forms, we utilized numerical methods to solve the complex Navier-Stokes partial differential equations. This was accomplished through the application of a finite volume solver (OpenFoam/Helyx OS). Additionally, we trained a neural ordinary differential equation (NODE) to learn and replicate the dynamical streamlines obtained from the computational fluid dynamics (CFD) simulations. Results: In all three cases, we observed that the equilibrium of blood pressure distributions across the VAs, at a specific vertical level, accurately predicted the future SVADA location. In the two cases where there was a dominant VA, the dissection occurred on the dominant artery where blood pressure was lower compared to the contralateral side. The SVADA sac was characterized by reduced wall shear stress (WSS) and decreased velocity magnitude related to increased turbulence. The presence of a high WSS gradient at the boundary of the SVADA may explain its extension. Streamlines generated by CFD were learned with a neural ordinary differential equation (NODE) capable of capturing the system's dynamics to output meaningful predictions of the flow vector field upon aneurysm formation. Conclusion: In our series, asymmetry in the vertebrobasilar blood pressure distributions at and proximal to the site of the future SVADA accurately predicted its location in all patients. Deep learning algorithms can be trained to model blood flow patterns within biological systems, offering an alternative to the computationally intensive CFD. This technology has the potential to find practical applications in clinical settings.
Language	English
Publishing date	2024-01-26
Publishing country	France
Document type	Journal Article
ZDB-ID	207146-0
ISSN	1773-0619 ; 0028-3770 ; 0150-9586
ISSN (online)	1773-0619
ISSN	0028-3770 ; 0150-9586
DOI	10.1016/j.neuchi.2023.101519
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