No abstract

La perfusion de protéines dans l’artère rénale du chien entraîne une réduction de la natriurèse du rein ainsi perfusé. Cette diminution de l’excrétion du sodium s’observe indépendamment de toute variation de la filtration glomérulaire. Ce phénomène pourrait constituer un argument en faveur de la conception suivant laquelle une partie, quantitativement non définie, mais sans doute faible, du sodium filtré, serait réabsorbée par un mécanisme de transport passif, dépendant de la grandeur du gradient de pression oncotique existant de part et d’autre de l’épithélium tubulaire.

The stop-flow technique has been applied to the dog in an attempt to rule out tubular secretion of phosphate and to locate the site of action of parathyroid hormone (P.T.H.) on the renal tubule. Under the experimental conditions used, no significant inward transtubular movement of P³² could be demonstrated, ruling out tubular secretion of phosphate. Stop-flow experiments performed in parathyroidectomized dogs before and after P.T.H. administration demonstrated inhibition of phosphorus reabsorption by the hormone. In addition, the stop-flow pattern indicated that this phenomenon took place mainly in the distal part of the proximal tubules.

We report a case of anterior mediastinal abscess treated by percutaneous drainage under computed tomography (CT) guidance. The relationships of the abscess to the adjacent organs were clearly delineated by an intravenous injection of contrast material, and the drain was inserted between the sternum and the vasa thoracica interna. Selection of this route and the choice of a large-bore catheter (16 F) are discussed.