2009.10.06 Quiz: Post-Obstructive Diuresis

A patient on long-term Foley experienced Foley blockage. After relief of the obstruction, he developed diuresis with an urine output of > 300ml/h. Which of the following is not one of the possible mechanisms of this post-obstructive diuresis?
A. physiological excretion of the previously retained water, salt and urea
B. impaired sensitivity of collecting duct to ADH
C. inability to maintain a medullary solute concentration gradient due to increased medullary blood flow during obstruction
D. increased atrial natriuretic peptide (ANP) levels resulting in natriuresis and diuresis
E. Central diabetes insipidus