Abstract
Objective To compare the capabilities of NT-proBNP and BNP in diagnosis of heart failure when complicated with acute cerebral infarction. Methods EP15-A2 document, was employed to verify the precision and accuracy of NT-proBNP and BNP assays on chemiluminescence analyzer Cobas E601 and ADVIA Centaur respectively for 363 samples from patients with chronic heart failure, cerebral hemorrhage and acute cerebral infarction, cerebral infarction complicated with heart failure and normal controls were collected and analyzed by Cobas E601 and ADVIA Centaur, and then determined the changing trends of NT-proBNP and BNP.Moreover, ROC curve was employed in diagnostic value comparison of NT-proBNP and BNP in heart failure groups. Results Cobas E601 and ADVIA Centaur showed good repeatability and accuracy in the detection of NT-proBNP and BNP that both total non-precision were below 3.5% and the deviations to calibrator were below 3.91%.The level of NT-proBNP an BNP didn′t elevate in normal people and cerebral hemorrhage patients.However, they significant elevated in heart failure, acute cerebral infarction and cerebral infarction complicated with heart failure patients(P<0.01).Their levels were heart failure grade dependent.The levels of NT-proBNP in cerebral infarction complicated with grade Ⅰ to Ⅲ heart failure patients were significantly higher than those in chronic heart failure patients, with same heart failure(P<0.05).However, compared to chronic heart failure patients, the level of BNP in cerebral infarction complicated with heart failure patients didn′t elevate significantly until grade Ⅲ heart failure happened.Areas under the ROC curve （AUCs） of NT-proBNP and BNP were both above 93% in the diagnosis of chronic heart failure.But for patients who suffered cerebral infarction complicated with heart failure, the diagnostic value of NT-proBNP and BNP were decreased due to cerebral infarction interference.However, the ROC area of BNP was larger than that of NT-proBNP(P<0.05). Conclusion In the diagnosis of cerebral infarction complicated with heart failure, BNP could be a better choice to determine the degree of heart failure.（Chin J Lab Med，2012,35：890-893） Key words: Brain infarction; Heart failure; Natriuretic peptide; brain
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