Kidney International, Vol. 53 (1998), pp. 503–507 TECHNICAL NOTE Use of gadopentetate dimeglumine as a contrast agent for percutaneous transluminal renal angioplasty and stent placement DAVID J. SPINOSA, ALAN H. MATSUMOTO, J. FRITZ ANGLE, and KLAUS D. HAGSPIEL Department of Radiology, University of Virginia Health Sciences Center, Charlottesville, Virginia, USA Use of gadopentetate dimeglumine as a contrast agent for percutaneous transluminal renal angioplasty and stent placement. Percutaneous transluminal renal angioplasty and stent placement was performed successfully in a patient with renal artery stenosis and renal insufficiency using gadopentetate dimeglumine and carbon dioxide as radiographic contrast agents. No iodinated contrast material was used for the procedure. Renal revascularization for patients with renal insufficiency remains a controversial treatment [1]. A meta-analysis of 379 patients treated with percutaneous transluminal renal angioplasty (PTRA) for renal insufficiency showed that in 55% of these patients, renal insufficiency was either stabilized or improved [2]. These results suggest that percutaneous revascularization may be helpful in this group of patients. Pre-existing renal insufficiency is the most important predisposing factor to the development of acute renal failure following contrast administration. Therefore, a non-toxic contrast agent for the angiographic detection and treatment of renal artery stenosis would be extremely helpful. Gadolinium-based contrast agents have been used extensively in magnetic resonance imaging. These agents have also been shown to be safe in patients with renal insufficiency [3, 4]. These gadolinium-based contrast agents have also been shown to have the potential for use as an angiographic contrast agent in selected patients [5–7]. Therefore, gadolinium-based contrast agents could have potential for use as an angiographic contrast agent. We report a case in which diagnostic renal angiography, followed by percutaneous transluminal angioplasty (PTA) and stent placement were performed using CO2 and gadolinium as the angiographic contrast agents. METHODS A 74-year-old white male with non-insulin dependent diabetes mellitus, coronary artery disease, peripheral vascular disease, cerebrovascular disease, severe hypertension requiring four antihypertensive medications and cholesterol emboli from previous angiography five weeks earlier presented with worsening renal Key words: gadopentetate dimeglumine, contrast agent, angioplasty, stent placement, renal artery stenosis. Received for publication July 21, 1997 and in revised form September 16, 1997 Accepted for publication September 16, 1997 © 1998 by the International Society of Nephrology insufficiency. The patient’s creatinine on this hospital admission was 3.9 mg/dl, up from a baseline creatinine of 2.2 mg/dl five weeks earlier. It was unclear whether the increasing creatinine was due to cholesterol emboli, contrast-induced nephrotoxicity, or progression of the patient’s underlying renal disease. A renal ultrasound performed at the time of admission showed the left kidney to measure 5.5 cm and the right kidney to measure 12.0 cm. Duplex ultrasound examination was suspicious for right renal artery stenosis and occlusion of the left renal artery. An attempt to gently hydrate the patient resulted in congestive heart failure. Following resolution of the patient’s pulmonary edema, the patient’s serum creatinine was 4.0 mg/dl. He subsequently underwent angiography using a 5 French pigtail catheter from a right femoral artery approach. The location of the origin of the right renal artery was determined with digital subtraction angiography (DSA) using hand injections of CO2 with the patient in the left posterior decubitus position. The pigtail catheter was positioned just above the right renal artery and an abdominal aortogram was performed using intraarterial gadopentetate dimeglumine (0.5 mmol/ml; Magnevist, Schering, Berlin, Germany) at an injection rate of 15 cc/second for a total of 30 cc (0.1 mmol/kg). Digital subtraction filming was performed using four exposures per second for two seconds followed by two exposures per second for four seconds. Filming parameters included exposure factors of 96 kv and 200 mÅ using a Siemens multiscope unit (Siemens Medical Systems, Iselin, NJ, USA). Digital subtraction angiography with CO2 suggested the presence of a moderate stenosis of the right renal artery, although there was some degree of uncertainty (Fig. 1). The DSA using Gadopentetate dimeglumine revealed a 70% stenosis of the right renal artery (Fig. 2). The left renal artery was not visualized, consistent with 100% left renal artery occlusion. The right renal artery was balloon dilated with a 6 mm 3 2 cm Courier balloon catheter (Boston Scientific Corp, Natick, MA, USA). Balloon positioning and post-angioplasty results were monitored using CO2 as the angiographic contrast agent. The post-angioplasty result suggested a 40 to 50% residual stenosis. Therefore, we elected to place an intravascular stent. A Palmaz 154 stent (Johnson & Johnson, Interventional Systems, Warren, NJ, USA), mounted on a 7 mm 3 2 cm Opta-5 balloon angioplasty catheter (Johnson & Johnson Interventional Systems), was positioned across the residual renal artery stenosis and deployed. Stent positioning was monitored with DSA using CO2 as the contrast agent. Final DSAs were performed using 60 cc of CO2 and 7 cc of Gadopentetate dimeglumine (0.5 mmol/ml). Both 503 504 Spinosa et al: Gadopentetate dimeglumine as a contrast agent Fig. 1. Digital subtraction abdominal aortogram performed with CO2 prior to renal angioplasty suggests significant right renal artery stenosis (arrow). agents were hand injected during separate digital acquisitions. Both the CO2 and gadopentetate dimeglumine studies demonstrated a widely patent right renal artery with correct positioning of the fully deployed renal stent (Fig. 3). A total of 37 cc of gadopentetate dimeglumine (0.19 mmol/kg) was administered for the procedure. No iodinated contrast agents were used. RESULTS No immediate complications related to the angiographic procedure were encountered. The patient developed congestive heart failure five days after the procedure that responded to vigorous diuresis. The serum creatinine was stable post-angioplasty; the stent placement measured 4.1 mg/dl at 48 hours following the procedure and measured 4.0 mg/dl 10 days following the procedure. The patient had no evidence for further cholesterol embolization. DISCUSSION Treatment of renal insufficiency with revascularization techniques remains controversial. Surgical revascularization in patients with renal insufficiency results in a higher perioperative mortality than in patients with serum creatinine levels less than 2.0 mg/dl [2]. Percutaneous intervention is appealing because of the less invasive nature of PTA and stenting. However, percutaneous intervention routinely requires the use of iodinated contrast agents, which, in itself, can lead to acute renal failure in patients with compromised renal function [8 –10]. Therefore, it would be very useful to have a non-nephrotoxic angiographic contrast agent available for use in patients with renal insufficiency. Gadopentetate dimeglumine demonstrates similar pharmocokinetics to that of iodinated x-ray contrast agents. Gadolinium is nearly completely excreted by glomerular filtration via the kidneys with a half life of 1.53 6 0.13 hours [4]. Several studies have shown that gadolinium has no apparent nephrotoxic effects in patients with normal renal function, renal insufficiency or renal failure. Doses up to 0.4 mmol/kg have been used safely in patients without evidence of nephrotoxicity or significant systemic toxicity [3, 4, 11–14]. In the presence of severe renal sufficiency there is some concern that there may be a delay in the clearance of gadoliniumDTPA complex. The accumulation of gadolinium-DTPA complex could in theory result in the release of free gadolinium cation (Gd31) into the liver and spleen, which would reduce the availability of other metabolically important cations such as zinc, copper, and calcium [14, 15]. Studies in rats receiving over 1,000 times the usual dose of gadolinium demonstrated histopathologic findings of zinc deficiency [15]. However, given the large doses Spinosa et al: Gadopentetate dimeglumine as a contrast agent 505 Fig. 2. Digital subtraction abdominal arteriogram performed with 30 cc of gadolinium dimeglumine prior to renal angioplasty demonstrates a 70% right renal artery stenosis (arrow). necessary to produce these findings in rats, relevance of this data to humans concerning doses of gadolinium for diagnostic studies is questionable. There has been no evidence in humans to date of depletion of nutritionally important minerals when gadolinium has been administered in doses used for diagnostic studies. Angiographic studies of the abdominal aorta, mesenteric vessels, pelvis and peripheral vasculature using gadolinium as a contrast agent have been previously reported [6, 7]. The use of gadolinium as the contrast agent during a percutaneous embolization for the treatment of hemorrhage associated with ruptured hepatocelluar carcinoma has also been reported [5]. Gadolinium has an atomic number of 64 and a k-edge of 50. Therefore, Fobbe, Wacker and Wagner have recommended that 110 kv be used when acquiring angiographic images with gadolinium, since the atomic number in k-edge for gadolinium is higher than that of iodine [6]. Although gadolinium has been shown to absorb sufficient energy to be visualized with DSA, these authors have also found that the image quality with gadolinium was consistently poor when compared to iodine-containing contrast agents [6]. Kaufman, Geller and Waltman found similar results using Gadolinium versus iodinated contrast when comparing image quality [7]. We administered undiluted gadolinium (0.5 mmol/ml) with a power-injector (Medrad Corp., Pittsburgh, PA, USA), and acquired our data at (96 kv and at 200 mÅ in order to maximize image quality. We limited our total dose of gadopentetate dimeglumine to less than 0.3 mmol/kg, as doses of this amount have not been associated with nephrotoxicity in patients with renal insufficiency. The use of CO2 as a non-nephrotoxic contrast agent (DSA) has been previously reported [16]. Our protocol minimizes iodinated contrast in patients with renal insufficiency (serum creatinine greater than 1.5). In these patients, we limit iodinated contrast by performing CO2 angiography. Routinely, the renal artery and kidney in question are elevated at least 45° by placing a wedge cushion under the patient to utilize the buoyant properties of CO2 gas to better fill the renal artery in question. Although CO2 angiography suggested the presence of renal artery stenosis, in our experience, CO2 has not been consistently reliable in the diagnosis of renal artery stenosis. This is particularly a problem when bowel motion causes subtraction artifacts over the renal artery being 506 Spinosa et al: Gadopentetate dimeglumine as a contrast agent Fig. 3. Digital subtraction arteriogram of the right renal artery following percutaneous transluminal angioplasty (PTA) and stent placement using 7cc of gadolinium dimeglumine reveals full stent deployment (arrow) and no residual renal artery. studied, as well as in the evaluation of possible branch stenoses. In the particular patient in this article, we were not confident enough to proceed to an intervention based upon the CO2 study alone. Despite the high cost of gadolinium, the use of gadolinium as a non-nephrotoxic contrast agent could facilitate the angiographic diagnosis and interventional treatment of renal artery stenosis without exposing the patient with renal insufficiency to the risk of contrast-induced nephropathy when CO2 angiography is technically not diagnostic. Patients who develop contrast nephropathy and acute renal failure after traditional contrast angiographic studies usually require prolonged hospitalization and incur additional medical costs. In addition, some of these patients may prematurely develop permanent renal failure, resulting in the need for long-term dialysis. The use of gadolinium as a contrast agent could result in the diagnosis and treatment of renal artery stenosis that may lead to stabilization or improvement of renal insufficiency in these patients without the use of iodinated contrast material and the risk of contrast nephropathy. In conclusion, this case suggests that gadolinium can be used as an alternative to iodinated contrast agents for the angiographic diagnosis and treatment of patients with renal insufficiency related to renal artery stenosis or in patients with renal artery stenosis and a history of a life-threatening iodinated contrast reaction. 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