captopril scan; ACE inhibitor renography; renal scintigraphy

Indications

• renal artery stenosis

Principle

• radionuclide scintigraphy of the kidneys to assess renal perfusion with & without captopril or some other ACE inhibitor
• Hippuran, Tc-DPTA, or Tc-MAG3 are agents used for renography

Methods

• sensitivity for detecting renal artery stenosis is 92%
• it is less sensitive in patients with bilateral renal artery stenosis or azotemia

More general terms

• scintigraphy (radionuclide test)