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Renal Arterial Stenosis | Doppler Ultrasonography for Predicting Outcome of Revascularization

Purpose: To use ultrasonography to determine if a patient with renal arterial stenosis is likely to benefit from a revascularization procedure.

Description

Radermacher et al used Doppler ultrasonography to evaluate patients with renal arterial stenosis. They used the resistance index (RI) to identify patients unlikely to benefit from revascularization procedures. The authors are from Medizinische Hochschule Hannover.


 

Parameters:

(1) end-diastolic velocity in cm/sec

(2) maximal systolic velocity in cm/sec

 

resistance index =

= (1 - ((end-diastolic velocity) / (maximal systolic velocity))) * 100

 

Interpretation:

• A resistance index >= 80 was associated with worsening renal function after a revascularization procedure.

• A resistance index < 80 was associated with a good chance of improved renal function and improvement in blood pressure following a revascularization procedure.

 

Additional factors associated with a poor outcome after a revascularization procedured:

(1) not smoking

(2) advanced renal disease (creatinine clearance < 40 mL per minute)

(3) male gender

 


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Specialty

Objective

ICD-10