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High-dose contrast agent administration during complex coronary angioplasty
J K Kahn1, B D Rutherford, D R McConahay
1Cardiovascular Consultants, Inc., Mid America Heart Institute, Kansas City, MO 64111.
Insights
High-dose contrast media in coronary angioplasty infrequently causes kidney damage, even in complex cases. However, minimizing contrast is advised for patients with diabetes or pre-existing kidney issues.
Area of Science:
- Cardiology
- Nephrology
- Radiology
Background:
- High-dose contrast media administration is sometimes necessary during complex coronary angioplasty.
- The potential for contrast-induced nephrotoxicity is a significant concern, particularly in vulnerable patient populations.
Purpose of the Study:
- To evaluate the necessity and outcomes of high-dose contrast media usage in coronary angioplasty.
- To assess the incidence of renal dysfunction following high-dose contrast administration.
Main Methods:
- Retrospective review of 730 consecutive patients undergoing coronary angioplasty over six months.
- Detailed analysis of 54 patients (7%) who received contrast doses >= 400 ml.
- Comparison of pre- and post-procedure serum creatinine levels.
Main Results:
- The mean contrast dose in the high-dose group was 496 ml.
- Serum creatinine increase >= 0.5 mg/dl occurred in 11% of patients, with 2% experiencing an increase >= 1.0 mg/dl.
- Factors contributing to high contrast doses included multilesion/multivessel angioplasty, prior bypass surgery, and combined procedures.
- Renal dysfunction was more common in patients with diabetes mellitus or baseline renal insufficiency.
Conclusions:
- High-dose contrast administration during complex coronary angioplasty is infrequently associated with significant nephrotoxicity.
- Patients with diabetes mellitus and/or baseline renal insufficiency are at higher risk for contrast-induced renal dysfunction.
- Minimizing contrast media doses should be prioritized in these at-risk patients whenever feasible.
Abstract:
To examine the necessity and consequences of high-dose contrast media administration during coronary angioplasty, the records of 730 consecutive patients over a 6-month period were reviewed. The 54 patients (7%) requiring contrast agent doses greater than or equal to 400 ml were examined in detail. The mean contrast dose in this group was 496 +/- 76 ml (range 400 to 785 ml). Their mean age was 63 +/- 11 years (range 36 to 83 years), 10 patients had diabetes mellitus (19%), and four patients had a baseline creatinine level greater than or equal to 1.5 mg/dl (7%). Following coronary angioplasty, the serum creatinine rose from 1.1 +/- 0.2 to 1.2 +/- 0.3 (p = 0.08). The creatinine rose greater than or equal to 0.5 mg/dl in six patients (11%) and greater than or equal to 1.0 mg/dl in one patient (2%). Five of these six patients had either diabetes mellitus, baseline renal insufficiency, or both. Oliguria was not observed. The most important procedural factors contributing to the high doses of contrast media were multilesion and multivessel angioplasty in 96% and 83% of patients, respectively, prior bypass surgery in 52%, and combined diagnostic cardiac catheterization and angioplasty in 13%. Thus renal dysfunction following high-dose contrast agent administration during complex coronary angioplasty is infrequently associated with nephrotoxicity. Whenever possible, contrast doses in patients with diabetes mellitus and renal insufficiency should be minimized.