Appendix. Prediction model for postoperative pneumonia in abdominal surgery: results of an observational multicenter study

Variable Risk index of PP A.M. Arozullah Calculator PP P.K. Gupta Prediction model of PP V. Russotto Nomogram of forecasting PP K. Kawasaki Risk Calculator PP Y. Takesue Risk Factor P H. Babak
Age + +   + +  
Gender       + +  
Preoperative SpO2, %     +      
Localization of the operation + + + +   +
Duration of the operation         +  
Urgency of surgical intervention +       +  
Blood urea nitrogen (< 2.86 mmol/l; > 7.85 mmol/l) +          
Functional state (dependence) + + +   +  
History of COPD + +     +  
Weight loss > 10 % in the last 6 months +       +  
General anesthesia +          
Violation of sensor perception +          
ACVA +     + +  
Transfusion of more than 4 units of blood components +          
The use of steroids in chronic diseases +       +  
Smoking for 1 year + +     +  
Alcohol intake > 2 servings per day for the last 2 weeks +          
ASA class   +     +  
Preoperative sepsis   +     +  
Intraoperative colloid infusion     +      
Intraoperative transfusion of blood components     +      
Brinkman Index ≥ 900       +    
Diabetes         +  
Ascites         +  
Hypertension         +  
Blood clotting disorder         +  
Prior percutaneous coronary intervention         +  
Brinkman Index ≥ 400         +  
Preoperative transfusion of blood components         +  
Hematocrit: male > 48 %, female > 42 %         +  
Serum albumin (< 25 g/l)         +  
AST > 35 U/l         +  
Alkaline phosphatase > 340 U/l         +  
Blood Urea Nitrogen (> 25 mg/dl)         +  
Na+ < 138 mmol/l         +  
Severe intraoperative blood loss         +  
Reduced FVC, FEV1 (according to spirometry)           +
Malnutrition (albumin ≤ 35 g/l, nutritional status control indicators > 4, prognostic nutrition index ≤ 40)           +
Table 1. Comparative characteristics of postoperative pneumonia (PP) prognostic scales ACVA — acute cerebrovascular accident; ASA — American Society of Anesthesiologists; AST — aspartate aminotransferase; COPD — chronic obstructive pulmonary disease; FEV1 — forced expiratory volume in 1 second; FVC — forced vital capacity; PP — postoperative pneumonia; SpO2 — oxygen saturation of the blood.