Urinary sodium, baseline loop diuretic dose, and short-term outcomes in ambulatory worsening heart failure: The NaU/F Index.
BACKGROUND Worsening heart failure (WHF) carries high short-term morbidity and mortality. Spot urinary sodium (NaU) is increasingly used to assess diuretic response but does not account for chronic loop diuretic exposure. OBJECTIVES To determine whether a urinary sodium-to-furosemide index (NaU/F) improves short-term...