Predictive factors for longer length of hospital stay in patients with heart failure

I have read the article by Kato et al. (1) entitled “Higher diuretic dosing within the first 72 h is predictive of longer length of stay in patients with acute heart failure” which was published in Anatol J Cardiol 2018; 20: 110-6, with great interest. In their study, authors reported that higher diuretic dosing in the first 72 h of hospitalization was an independent predictor of longer length of hospital stay in patients with acute heart failure. In addition, they concluded that there could be important predictors of the length of hospital stay that were not included in their study. Beside this, they reported that laboratory data of patients, including serum sodium level and cardiac troponin values, were recorded on admission and during the first 72 h of hospitalization (1). I would like to emphasize some important points about this well-written study. It has been demonstrated that cardiac troponin is an important marker for the prognosis of acute heart failure. In previous studies, it has been shown that an elevated cardiac troponin level on admission has been associated with increased length of hospital stay (2, 3). Moreover, hyponatremia is a common electrolyte disorder in patients with heart failure