Friday, August 29, 2014

What investigation is being performed here?



































































This is an antegrade pyelogram, performed as part of an antegrade pressure-flow study (Whitaker test) to determine the presence of obstruction in the ureter. The pressure difference between renal pelvis & bladder is measured during perfusion of fluid at a constant rate (10 ml/min) through the collecting system. A rise in pressure (>15 cm of water) is suggestive of obstruction. The increasing senstivity of renography means that the Whitaker test is now rarely performed.


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