Circulating osteonectin predicts postural imbalance and cardiac dysfunction in heart failure.

Osteonectin, a secreted glycoprotein, plays a role in muscle-wasting disease. However, its role in chronic heart failure (CHF) -induced systemic inflammation and postural control is unknown. Here we aim to assess the potential association of soluble osteonectin with cardiac dysfunction and postural imbalance in CHF. The cardiac function, physical performance, including short physical performance battery (SPPB) for balance, handgrip strength (HGS), and the levels of plasma osteonectin and c-reactive protein (CRP) were assessed in controls (n = 56) and CHF patients (n = 286) presented with ischemic and non-ischemic CHF. CHF patients exhibited significantly lower HGS and postural balance accompanied by higher cardiac contractile dysfunction. Regardless of HF etiologies, the osteonectin and CRP levels were significantly higher in CHF patients vs. controls. The osteonectin exhibited a significant inverse correlation with left ventricular ejection fraction (LVEF) in both ischemic (r2 = 0.13, P < 0.0001) and non-ischemic (r2 = 0.18, P < 0.0001) CHF patients. Similarly, osteonectin has shown a strong negative correlation with cumulative SPPB score in both ischemic (r2 = 0.19, P < 0.0001) and non-ischemic (r2 = 0.22, P < 0.0001) patients. Further SPPB balance-based analysis demonstrated lower LVEF and markedly elevated osteonectin and CRP (P < 0.0001), particularly in patients with poor postural balance compared to those with relatively good balance. Importantly, osteonectin demonstrated significantly higher sensitivity and specificity for CHF diagnosis on ROC curve analysis. Taken together, higher osteonectin level is associated with LV dysfunction and postural imbalance irrespective of CHF etiologies. It may serve as a biomarker for physical disability and contractile dysfunction in CHF patients.