Abstract
Background: Brain natriuretic peptide (BNP) is routinely measured for evaluating the severity of acute decompensated heart failure (ADHF). However, there are no other biomarkers for stratification of ADHF patients in clinical settings. Cardiac myosin I (CM-I) is one of a superfamily of motor proteins, which is mainly distributed in myocardium. Several papers reported that serum CM-I levels increased in patients with acute coronary syndrome (ACS). However, the role of CM-I in ADHF patients is not yet elucidated. Purpose: The aim of this study was to clarify the utility of CM-I in ADHF patients. Methods: We assessed 114 ADHF patients who visited our institution between December 2017 and May 2018 in a retrospective study. All patients were diagnosed ADHF using Framingham criteria. Eight ACS patients and 22 patients lacking in data of serum CM-I levels were excluded. Finally, we analyzed 84 patients. We calculated the difference in serum BNP levels between on admission and at discharge (delta BNP) as a prognostic surrogate marker. Results: Average age was 77.5 years old and 44 patients were male. Numbers of patients with NYHA III and IV were 30 and 36, respectively. Mean serum levels of BNP and Troponin T (TrT) on admission were 934.0 pg/ml and 0.092 ng/ml, respectively. Average left ventricular ejection fraction (LVEF) by echocardiography was 46.1%. Serum CM-I levels on admission and at discharge were 12.8 mg/ml and 7.30 mg/ml, respectively. Serum CM-I levels had a significant correlation with TrT levels (R=0.46, p<0.0001) and a weak correlation with BNP levels (R=0.33, p= 0.006). CM-I levels were not statistically correlated with LVEF. CM-I levels were well correlated with delta BNP(R=0.36, p= 0.0138), but TrT were not associated with delta BNP(R=0.066, p= 0.658). Conclusion: We found CM-I was associated with the difference in BNP between on admission and at discharge in ADHF patients. CM-I may be a new potential prognostic biomarker in ADHF patients.
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