TNNT2 and chronic obstructive pulmonary disease: Rho revealed a very strong correlation between PAOI and cTnT for the entire sample (Rho = 0.815) and for each etiology (Rho = 0.882 in DVT, Rho = 0.937 in AF, Rho= 0.982 in COPD, and Rho = 0.828 in COVID-19 patients).