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Biomedical subjects

E Bosc

Publications and source records attributed to E Bosc.

9 recordsLinked to original sources
PubMed1979

[Automatic activity of the pre-excitation pathways].

The possibility of preexcitation pathways exhibiting automatic activity was demonstrated in 3 cases: in two cases electrophysiological studies supported this diagnosis which was confirmed in the third case by histological examination of the preexcitation pathway. During sinus node dysfunction, spontaneous or induced (by rapid right atrial pacing or by a reciprocating tachycardia), the substitute rhythm arose from the Kent Bundle either transiently or for a longer period: rhythms arising from the Kent Bundle can only be diagnosed after eliminating the possibility of an atrioventricular junctional rhythm conducted to the ventricles by Mahaïm fibres.

Adult↗
PubMed1979

[Congenital arteriopathies and Leo Buerger's disease].

A homogenous series of 7 consecutive cases of Buerger's disease were investigated and the congenital malformations of the upper and lower limb arterial trunks were classified. These malformations constitute the anatomical basis of Buerger's disease and define an autonomous disease entity. Total supra-malleolar interruption of the main lower limb arteries either by triple vessel agenesis or, more rarely, by femoro-popliteal or popliteal and tibio-peronal agenesis was observed. The appearances of the collateral circulation, already established in utero, are characteristic with long axial spiral-shaped arteries and dependant arterioles maintaining a precarious supply to the distal tissues which may be adequate for many years. The nautral history of the disease is directly related to the malformation of the congenital arterial system of the limbs. Proximal arterial malformative occlusion is the cause of early, inevitable trophic lesions; the spiral-shaped arteries and distal arterioles, which represent the maximal embryonic collateral circulation, limit the area of necrosis and favour healing.

Adult↗
PubMed1978

[Arterial malformations and Takayashu disease].

The authors report a recent series of 5 cases with Takayashu's disease and discuss the common pathological presentation of malformations of the arterial trunk, caused by disorderd development of the arterial system or by later segmental arrested development of the large trunks. The disease, which presents in the young adult as a diffuse inflammatory process, is probably auto-immune, but has its foundations in embryonic and foetal development.

Adult↗
PubMed1978

[Congenital defects of the aortic system].

The authors give a basic embriological classification of congenital arterial defects. Congenital abnormalities of the arterial system (arising in an embryo of 12 to 30 mm) affect the primary segments, and comprise excessive involution of the antibrachial trunk, of the popliteal artery, of the tibio-peroneal trunk and peroneal artery, abnormal or persistence of the interosseus artery, of the artery of sciatic nerve, and of the peroneal artery, a high axillary origin of the radial or antecubital artery, renal polar arteries arising directly from the aorta, and agenesis of the palmar or plantar arches. In the second generation arteries, they comprise agenesis or hypogenesis of the radial, antecubital or tibial arteries, and gross hypogenesis of the trunk of the renal artery with an immature kidney. Arrested or mal-development in the foetus can give rise to coarctation and stenosis of the thoracic aorta and large vessels, to segmental agenesis with huge collaterals, to imperforate osita, especially in the mesenteric arteries, to sudden variations in diameter of the renal arteries, and to parietal dyplasia and aneurysms in vessels in the residual undifferentiated mesenchymatous tissue, and diffuse dilatation or stenosis. The authors give their experience for a cardiological clinic, adding arterial hypertension and arterioparenchymatous dysplasia of the kidneys, Raynaud's, Takayasbu's and Burger's disease, and intermittent claudication of the lower limbs; they indicate the areas which they are currently studying.

Adult↗
PubMed1977

[Reversible "experimental" human arterial hypertension after fortuitous ligation of an isolated polar renal artery of aortic origin].

During the course of an aorto-femoral bypass in a normotensive young man, an inferior polar artery arising low on the aorta, and supplying the right kidney, was ligated. The limited ischaemia (demonstrated by later arteriography) of the parenchyma at the pole of the kidney was responsible, during the following weeks, for severe hypertension with a raised level of circulating plasma renin, but one that was rapidly treatable. This finding, which was fortuitous but could be ranked as "experimental", demonstrates the important role of abnormal polar arteries and of the renal parenchyma in human arterial hypertension. Such may, for example, be the underlying disorder in cases of hypertension after the transplantation of a kidney with an "uncontrolled" polar artery arising from the aorta, for the so-called "pyelonephritic" hypertension in pregnant patients caused by defective blood supply in an inter-pyramidal artery and corresponding subcortical infarction of the kidney, and for curing hypertension in the adult when isolated polar arteries arising from the aorta and stenosed at their point of origin are reimplanted into the main renal artery.

Adult↗
PubMed1976

[Atrioventricular block and localized reentry into the trunk of the bundle of His].

In a patient with an AV block and a resulting variable rhythm, the coupled ventricular complexes with dissociated P waves on the standard tracing suggested a reentry into the atrioventricular area. Intracavitary investigation revealed: 1) a complete bidirectional AV block in the upper portion of the bundle of His (there being a proximal His potential with a fixed relationship with the dissociated atrial activity shown on the ventriculogram); 2) escape of the bundle of His low down, or of the beginnings of the branches, preceded by a distal Hispotential; 3) re-entry echos preceded by a third variety of potential in the bundle of His.

Bundle of His↗