Abstract
Background: Stroke subtype diagnosis leads to specific therapies to reduce recurrences. Because nearly one third of patients remain with unknown etiology after a complete screening workup, we aim to investigate whether molecular markers of myocardial damage were associated with cardioembolic stroke and if they were useful to reclassify strokes of undetermined etiology.Methods: We included 262 patients with first ischemic stroke within the first 12 hours. Stroke subtype was evaluated by TOAST criteria. Stroke of undetermined origin were reclassified into likely atherothrombotic or likely cardioembolic according to a predefined non-validated algorithm. Blood samples were obtained on admission to determine serum levels of molecular markers (pro-BNP, pro-ANP and CK-MB) of myocardial damage.Results: Patients with cardioembolic infarct showed higher levels of pro-BNP, pro-ANP and CK-MB. Pro-BNP > 360 pg/mL was independently associated with cardioembolic stroke (OR: 28.51, CI95%: 5.90–136.75,p< 0.0001). Stroke etiology was undetermined in 82 patients (31%); 34 were reclassified as likely cardioembolic, 22 as likely atherothrombotic, and 26 remained as undetermined. Pro-BNP > 360 pg/mL was the only factor independently associated with likely cardioembolic stroke.Conclusions: Pro-BNP levels higher than 360 pg/mL are associated with cardioembolic stroke and may be useful to reclassify undetermined strokes as of cardioembolic origin.
Highlights
Stroke subtype diagnosis leads to specific therapeutic actions to reduce recurrences
Transient increased of cre-atin kinase-MB (CK-MB) plasma levels are found in acute myocardial infarction [23], and high plasma levels of atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) have been associated with ventricular dysfunction and poor outcome in patients with acute myocardial infarction and congestive heart failure [19, 33]
Using ROC curves analyzing cardioembolic versus non-cardioembolic infarcts, we found that the best cutoff point of pro-BNP to predict cardioembolic stroke was 360 pg/mL, of pro-ANP 2266.6 fmol/mL and of CK-MB 2.6 ng/mL
Summary
Stroke subtype diagnosis leads to specific therapeutic actions to reduce recurrences. TOAST criteria [1] are the most used criteria for stroke subtype classification, after a complete screening tool, nearly one third of patients remain without a specific etiology. Several molecular markers, such as atrial natriuretic peptide (ANP), brain natriuretic peptide (BNP) and cre-. Transient increased of CK-MB plasma levels are found in acute myocardial infarction [23], and high plasma levels of ANP and BNP have been associated with ventricular dysfunction and poor outcome in patients with acute myocardial infarction and congestive heart failure [19, 33] These molecular markers have been investigated in stroke patients. Conclusions: Pro-BNP levels higher than 360 pg/mL are associated with cardioembolic stroke and may be useful to reclassify undetermined strokes as of cardioembolic origin
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