ALB and aortic aneurysm: On the basis of this value, we developed a new scoring system to predict the occurrence of PPCs, composed of age ≥70 years (2 points), current smoker within 2 months (1 point), ASA class ≥2 (1 point), the presence of airflow limitation (1 point), serum albumin <4.0 g/dL (1 point), emergency surgery (2 points), and cardiac/aortic aneurysm repair/abdominal open surgery (non-laparoscopic) surgery (4 points), resulting in a maximum of 12 possible points.