The elevated BNP suggested possible heart failure, though the absence of physical examination findings made this less likely. Electrolyte abnormalities included hyponatremia, hypomagnesemia, and hypophosphatemia (Table 1), which were consistent with poor oral intake and chronic illness. Two days prior to admission, she had received 2 units of packed red blood cells for severe anemia presumed to be secondary to her chemotherapy. Here, NPPB is linked to heart failure.