NPPB and metabolic syndrome: Univariate correlation analysis (Table 4) demonstrated that post-PCI cTnI levels exhibited significant positive associations with total occlusion status (r = 0.258, P < 0.001) and BNP levels (r = 0.254, P < 0.001), whereas no significant correlations were observed with hypertension (r = −0.094, P = 0.201), age (r = 0.078, P = 0.288), diabetes (r = −0.035, P = 0.643), gender (r = −0.107, P = 0.146), dyslipidemia (r = 0.004, P = 0.955), or smoking history (r = 0.065, P = 0.373).