NPPB and yang deficiency: The previous research results (38) have certain differences from the current results: The NT-proBNP among different syndrome types, from high to low, is Yang deficiency with water retention syndrome, phlegm turbidity blocking the lung syndrome, Qi and Yin deficiency syndrome, heart and lung Qi deficiency syndrome, and Qi deficiency with blood stasis syndrome, and the differences are statistically significant (P < 0.05).