NPPB and chronic obstructive pulmonary disease: In the original cohort, a larger percentage of the ABG patients were male (45.4%), at an advanced age (41.3%), in NYHA cardiac function classification IV (35.6%) or Killip grade ≥II(79.7%) and had higher Pulse (86.91 ± 21.49), Respiration rate (19.30 ± 1.70), White blood cell (7.71±3.77 × 109/L), Troponin (0.43 ± 2.72 pg/ml), BNP (1,392.51 ± 1,462.23 pg/ml), CCI score, consisted of more Peripheral vascular disease (6.4%), Chronic obstructive pulmonary disease (COPD) (16.3%), Diabetes (26.5%) and Chronic kidney disease (25.3%) than no ABG group.