Aprotinin in cardiac surgery patients: is the risk worth the benefit?
BACKGROUND
Aprotinin is the only Food and Drug Administration-approved agent to reduce haemorrhage related to cardiac surgery and its safety and efficacy has been extensively studied. Our study sought to compare the efficacy, early and late mortality and major morbidity associated with aprotinin compared with e-aminocaproic acid (EACA) in cardiac surgery operations.


METHODS
Between January 2002 and December 2006, 2101 patients underwent coronary artery bypass grafting (CABG), valve surgery or CABG and valve surgery in our institution with the use of aprotinin (1898 patients) or EACA (203 patients). Logistic regression and propensity score analysis were used to adjust for imbalances in the patients' preoperative characteristics. The propensity score-adjusted sample included 570 patients who received aprotinin and 114 who received EACA (1-5 matching).


RESULTS
Operative mortality was higher in the aprotinin group in univariate (aprotinin 4.3% vs EACA 1%, p=0.023) but not propensity score-adjusted multivariate analysis (4% vs 0.9%, p=0.16). In propensity score-adjusted analysis, aprotinin was also associated with a lower rate of blood transfusion (38.8% vs 50%, p=0.04), a lower rate of haemorrhage-related re-exploration (3.7% vs 7.9%, p=0.04) and a higher risk of in-hospital cardiac arrest (3.7% vs 0%, p=0.03) and a marginally but not statistically significantly higher risk of acute renal failure (6.8% vs 2.6%, p=0.09). In Cox proportional hazards regression analysis, the risk of late death was higher in the aprotinin compared to EACA group (hazard ratio=4.33, 95% confidence interval (CI)=1.60-11.67, p=0.004).


CONCLUSIONS
Aprotinin decreases the rate of postoperative blood transfusion and haemorrhage-related re-exploration, but increases the risk of in-hospital cardiac arrest and late mortality after cardiac surgery when compared to EACA. Cumulative evidence suggests that the risk associated with aprotinin may not be worth the haemostatic benefit.
Stamou
Sotiris C
SC
Department of Thoracic and Cardiovascular Surgery, Carolinas Heart and Vascular Institute, Carolinas Medical Center, Charlotte, NC 28203, USA. cvsisfun@hotmail.com
Reames
Mark K
MK
Skipper
Eric
E
Stiegel
Robert M
RM
Nussbaum
Marcy
M
Geller
Rachel
R
Robicsek
Francis
F
Lobdell
Kevin W
KW
D058186:Acute Kidney Injury / Q000139:chemically induced; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000614:Aminocaproates / Q000627:therapeutic use; D007611:Aprotinin / Q000009:adverse effects* / Q000627:therapeutic use; D016063:Blood Loss, Surgical / Q000517:prevention & control*; D001803:Blood Transfusion; D006348:Cardiac Surgical Procedures; D001026:Coronary Artery Bypass; D004341:Drug Evaluation; D004812:Epidemiologic Methods; D005260:Female; D006351:Heart Valves / Q000601:surgery; D006488:Hemostasis, Surgical / Q000009:adverse effects* / Q000379:methods; D006490:Hemostatics / Q000009:adverse effects* / Q000627:therapeutic use; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000139:chemically induced; D019106:Postoperative Hemorrhage / Q000517:prevention & control; D012086:Reoperation; D055815:Young Adult
D000614:Aminocaproates; D006490:Hemostatics; D007611:Aprotinin