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Biomedical subjects

G Maret

Publications and source records attributed to G Maret.

At least 37 records · Page 2Linked to original sources
PubMed1989

[Pulmonary arteriovenous fistula. Apropos of 12 cases].

Arteriovenous fistula of the lung is a relatively rare lesion with various clinical manifestations. It may be clinically silent and discovered by chance on X-ray films of the chest or during evaluation of Rendu-Osler-Weber disease with which it is associated in about one-half of the cases. It may also have loud manifestations when complicated. The fistula is diagnosed in successive steps, mainly by respiratory function tests and pulmonary angiography. Conservative treatment should be the rule, especially in case with multiple fistulae, but it must begin at an early stage to avoid the dramatic complications of this abnormality, such as acute neurological disorders, haemoptysis, haemothorax, etc. Wide and crippling lung resection must be avoided. Aneurysmorrhaphy or embolization is sufficient to cure most of these multiple angiomas. The results obtained are measured by calculating the blood flow rate in the shunt, as it should theoretically disappear after surgery.

Adult↗
PubMed1987

Synthesis and use of peptide substrates for the isolation and characterization of proenkephalin processing enzymes.

Classical methods of peptide synthesis in solution were used for the preparation of the two tetrapeptides alanyl-lysyl-arginyl-tyrosine and acetyl-alanyl-lysyl-arginyl-tyrosine-(N-methylamide). The two compounds were able to be recognized as substrates by proenkephalin processing enzymes and were used for the development of a quantitative assay for these enzymes. The first substrate proved to be convenient, although it was also partially degraded by amino- and carboxypeptidases under the conditions of the assay. The second was found to be hydrolyzed by the endopeptidases at too slow a rate to allow its routine use in the assay.

Adrenal Medulla↗
PubMed1983

Fibrinogen and fibrin structure and fibrin formation measured by using magnetic orientation.

Accurate birefringence measurements show that fibrinogen orients to a small degree in high magnetic fields. This effect can be explained as due to the molecule having about 30% (by weight) alpha-helix oriented relatively parallel to the long axis. Birefringence measurements on fully oriented fibrin suggest that aligned alpha-helical content is less than that estimated for fibrinogen. But because of limitations in the analysis this difference must be viewed with caution. Highly oriented fibrin results when polymerization takes place slowly in a strong magnetic field. Low-angle neutron diffraction patterns from oriented fibrin made in the presence of EDTA, made in the presence of calcium, or stabilized with factor XIIIa are very similar, showing that the packing of the molecules within the fibers is the same or very similar in these different preparations. The induced magnetic birefringence was used to follow fibrin formation under conditions in which thrombin was rate limiting. The fiber network formed by approximately the gelation point constitutes a kind of matrix or frame that is largely built upon during the remaining approximately 85% of the reaction. After gelation the reaction is pseudo-first order.

Animals↗
PubMed1980

[Thymectomy for myasthenia gravis without thymoma. Long term results (author's transl)].

The authors report an analysis of the long term results of 45 operated cases: 35 are symptom free in 7 cases more than 10 years later, 9 were improved and only one is worse. Operative mortality was nil; sternotomy is used in all cases. The authors insist on the reduction of therapy before attempting operation which should be carried out after 48 hours.

Adult↗
PubMed1979

[Sarcoma of the right superior pulmonary vein: physiopathological study of the progressive stenosis in a lobar vein (author's transl)].

A part from the interest aroused by the exceptional nature of this case of sarcoma of the right superior pulmonary vein, it enabled definition of the angiographic appearances of the affection of the vein. Physiopathological examinations, including vascular redistribution, development of a systemic collateral circulation, and the reflux of hematosed blood into the pulmonary trunk, were able to establish the diagnosis in vivo.

Collateral Circulation↗