Calculation of blood velocity and pressure in stenosed renal artery considered as a Venturi tube.

The authors propose using a Venturi tube as a model of stenosed renal artery; they can thus calculate blood velocity and pressure in the stenosed part from estimated renal flow, systemic pressure and the hydraulic characteristics of the model.

[The use of simultaneous angiography to determine the signification of vascular images in renal scintiscans with technetium (author's transl)].

Combined angiography and renal scintiscans were used by the authors in an attempt to determine the signification of the images and vascular tracings obtained after intravenous injection of technetium (99mTc). They conclude that the scintiscan images are essentially the reflection of cortical vascularization and that its duration, as determined by the scintiscan, is roughly equal to the mean transit time of the indicator employed (Tc). Arterial stenosis cannot be demonstrated by scintiscans using technetium.