Stenosis and renographic characteristics in renovascular disease.

Unlabelled: This study was designed to determine the degree of renal artery stenosis (RAS) which produces changes in renographic parameters.

Methods: The angiographic severity of luminal narrowing in RAS was compared to 131I-hippuran renographic characteristics in 72 patients who have been selected for renal angiography because of suspected renovascular hypertension.

Results: Significant differences in Tmax, T1/2 and counts under the curve to Tmax were apparent at 30% of arterial luminal narrowing when stenotic and nonstenotic kidneys were compared.

[Ultrasonography of the leg veins is cost-effective and can be the preferred diagnostic study in suspected pulmonary embolism].

Objective: To determine whether compression ultrasound examination of both legs, to detect deep venous thrombosis, can be the examination of first choice in patients clinically suspected of pulmonary embolism, assuming that the therapy of thrombosis is the same as the therapy of embolism.

Design: Prospective study.

Setting: St.

Potassium supplements prevent serious hypokalaemia in colon cleansing.

The association between colonic cleansing and hypokalaemia was studied prospectively by monitoring the serum potassium levels in four groups of patients: groups 1 (55 patients), 2 (72 patients), and 3 (97 patients) received the same 2-day preparation of 15 g magnesium sulphate and 10 mg bisacodyl twice daily; group 4 (96 patients) received a 1-day preparation of 2.4 mg sennoside per kg of bodyweight. Groups 1 and 2 were on diuretics, but only group 2 received potassium supplementation.