NPPB and memory impairment: Other symptoms that were associated with relatively high average BNP levels were dyspnea (24.1 pg/mL), palpitation (23.6 pg/mL), alopecia (22.3 pg/mL), myalgia (22.2 pg/mL), loss of appetite (22.2 pg/mL), memory impairment (19.9 pg/mL), and tiredness (18.8 pg/mL) (Figure 4).