Results of the retrospective analysis of renal artery stenting for the salvage of renal function study

Determinant role of renal artery stenting in recovery from acute worsening of atherosclerotic renal failure

Because previous randomized clinical trials have failed to show any benefits of renal artery stenting (RAS), clinicians have been confused regarding the optimal management of patients with atherosclerotic renal artery stenosis (ARAS). Here, we report a notable case with ARAS whose clinical course could help clinicians identify patients suitable for RAS. A 66-year-old woman with ARAS and some parameter abnormalities on renal duplex ultrasound was admitted to our hospital with severe hypertension (>250 mmHg). After the initiation of antihypertensive intravenous treatment, the patient manifested acute worsening of renal function over 6 days and required dialysis. Because renal failure continued to deteriorate over more than 4 weeks, we performed stenting to the severe ostial stenosis of the right renal artery. As a result, the patient achieved dramatic improvement in renal function and successful withdrawal from dialysis and has maintained stable control of blood pressure without additional events for more than 2 years since discharge. This case suggests that careful analysis of the patient's profile, such as history of rapidly deteriorating renal failure, presence of bilateral ARAS, or a solitary functional kidney, in addition to various parameters of renal duplex ultrasound, may help predict the efficacy of RAS in patients with ARAS.

<Learning objective: Because several randomized studies have reported negative results for renal artery stenting (RAS), an individual-based approach is required for the treatment of atherosclerotic renal artery stenosis (ARAS). To determine whether RAS could be effective in patients with ARAS, it is important to assess patient-specific characteristics such as progression of renal failure (e.g. acute worsening), presence of bilateral ARAS, or the existence of a solitary functional kidney, as well as parameters of related examinations such as the renal arterial resistive index.>

Successful Retrieval of a Stuck Guidewire by Guiding Catheter Lock Technique in Renal Artery Stenting

Introduction

The guiding catheter lock technique is a therapeutic technique to increase backup force of the guiding catheter in coronary artery interventions.

Surgical technique

A 71 year old man presented with rapidly declining kidney function resulting from bilateral renal artery stenosis. During the renal artery stenting procedure, the 0.014" guidewire became trapped at the stent's distal edge. Although attempts were made to advance a microcatheter and balloon catheter over the trapped guidewire, these failed because of insufficient pushability of the guiding catheter. Therefore, the guiding catheter lock technique was used with a second guiding catheter, and the guidewire was successfully retrieved.

Discussion

The guiding catheter lock technique facilitated strong pushability to allow for successful retrieval of a stuck guidewire during renal artery stenting.

•

During renal artery stenting, a guidewire was trapped at the stent's distal edge.

•

The stuck guidewire was retrieved using the guiding catheter lock technique.

•

The guiding catheter lock technique can be useful for bailout of a stuck guidewire.