NT-proBNP concentration significantly decreased in all three groups (median change of −301.00 pg/mL for G1, p = 0.001; −309.00 pg/mL for OSA-G2, p = 0.043; and −299.50 pg/mL for G3, p < 0.001). This evidence concerns the gene NPPB and obstructive sleep apnea syndrome.