OBJECTIVE To test the efficiency of the direct duplex scanning parameters in the diagnosis of renal artery stenosis (RAS), and verify whether or not the cut-off points recommended by medical literature are the most appropriate means to distinguish lesion severity. METHODS Prospective study, including 62 patients with RAS, submitted to a duplex ultrasound scan and selective arteriography. The ...

ALTHOUGH the collateral anastomotic channels that occur secondary to obstruction of the first segment of the subclavian artery have received relatively little comment by anatomists, the participation by the vertebral artery in such instances has been mentioned.' Recently, the finding of retrograde flow from the vertebral artery on the side of an obstruction in the first part of the subclavian a...

Numerous anatomical and functional changes occurring in the aging kidney lead to reduced glomerular filtration rate, lower renal blood flow and impaired renal autoregulation. The elderly are especially vulnerable to the development of renal dysfunction and in this population acute renal failure (ARF) is a common problem. ARF is often iatrogenic and multifactorial; common iatrogenic combinations...

Forty-seven patients with unilateral obstructive calculi (12 males and 35 females) were submitted to 99mTc-diethylene triamine pentaacetic acid (DTPA) or 99mTc-dimercaptosuccinic acid (DMSA) scans for assessment of renal function. The scans revealed unilateral functional deficit in 68 and 66% of the patients, respectively. A calculus size of 1.1 to 2.0 cm was significantly associated with defic...

Coronary arterial obstruction associated with congenital aortic valve disease is rare in childhood. We studied two children with aortic valve disease and symptoms of coronary insufficiency. Cineangiography revealed localized obstruction of the proximal left coronary artery. In one patient, a membrane-like structure partially covered the left sinus of Valsalva, almost isolating the ostium of the...

Ureteral obstruction can occur due to various pathologies. Ureteral calculus is one of the commonest causes. Extra luminal and less commonly intra luminal Ureteral obstruction can occur due to malignancy. Unrecognised Ischemic injuries during gynaecological surgery can cause ureteric stricture and obstruction at a later date. Traumatic injuries have also been documented as an important cause of...

BACKGROUND/AIM Renal oxidative stress occurs in ureteral obstructions. The purpose of this study was to investigate the effect of the antioxidant and antiischemic agent trimetazidine (TMZ) on oxidative stress following ureteral obstruction. MATERIALS AND METHODS Ten groups were established. Sham groups were checked as controls after 1 and 3 weeks. The other 8 groups had partial or complete ur...

In hypertension caused by unilateral renal artery stenosis, the nonstenotic kidney becomes renin depleted but fails to prevent hypertension. The nonstenotic kidney mysteriously develops elevated intrarenal angiotensin II (ANG II) content. Rats chronically infused with ANG II exhibit a similar hypertensive process. The augmentation of intrarenal ANG II is due to receptor-mediated internalization...

Ureteral obstruction (ureteropelvic or ureterovesical junction obstruction) is frequently diagnosed during the workup investigation of an asymptomatic infant child with upper urinary tract dilatation, commonly identified in a prenatal ultrasound. In older children, recurrent lumbar pain red flag for ureteral obstruction. Although less frequent, hypertension may be initial and only manifestation...

A man with metastatic carcinoma of the colon had a bone scan which revealed urinary retention in the left kidney. Ten months later, a Tc-99m-DTPA renai glomerular study showed the left kidney to have only 8% of total renal function. Fifteen months after that, (he same kidney demonstrated 9% of total function, while the right kidney had evolving obstruction due to his neoplasm. The case sh...