Analysis of the sensitivity and specificity of noninvasive imaging tests for the diagnosis of renal artery stenosis.

Background: Aging and atherosclerosis are related to renovascular hypertension in elderly individuals. Regardless of comorbidities, renal artery stenosis is itself an important cause of cardiovascular morbidity and mortality.

Objective: To define the sensitivity, specificity, positive predictive value, and negative predictive value of noninvasive imaging tests used in the diagnosis of renal artery stenosis.

[Comparative study of 18 F-fluorodeoxyglucose imaging with a dual-head coincidence gamma camera with dobutamine stress echocardiography for the assessment of myocardial viability].

Objective: To compare Dual-Head coincidence gamma camera (DCD-AC) with dobutamine stress echocardiography (DSE) in viability assessment, using functional recovery as the gold standard.

Methods: Twenty-one patients were prospectively studied, with coronary artery disease and severe left ventricular dysfunction undergoing DSE and DCD-AC at baseline and DSE three months after revascularization.

Results: Of the 290 segments analyzed, 83% were akinetic, 15% hypokinetic and 2% dyskinetic at rest.