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Figure 17. 99mTc-MAG3 scan in a patient with renovascular hypertension. (A) Sequential 2 mintue images show diminished initial uptake and slow clearance of tracer from the right kidney. Uptake and clearance on the left are normal. The same findings are evident on the renogram curves (B). The left kidney shows a normal renogram. The "time to peak" activity on the right is 12 minutes compared to 6 minutes on the left while the degree of parenchymal retention is considerably higher.

Figure 17. 99mTc-MAG3 scan in a patient with renovascular hypertension. (A) Sequential 2 mintue images show diminished initial uptake and slow clearance of tracer from the right kidney. Uptake and clearance on the left are normal. The same findings are evident on the renogram curves (B). The left kidney shows a normal renogram. The "time to peak" activity on the right is 12 minutes compared to 6 minutes on the left while the degree of parenchymal retention is considerably higher.

unilateral disease in patients with GFR > 30 ml/min. An unstimulated renal scan has a false negative rate of 20- 25%. The predictive value of scanning can be increased by performing a captopril-stimulated renal scan in the patient with normal or minimally impaired renal function (GFR > 30 ml/min) who is not on an ACE (angiotensin converting enzyme) inhibitor or AT1 (angiotensin type 1) receptor antagonist. In properly selected patients, the sensitivity and specificity of high probability findings approach 90%. A normal study will show symmetric uptake and prompt excretion on both the baseline and captopril studies and implies a low (<10%) probability of renovascular hypertension.

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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