ABSTRACT PREDICTIVE PERFORMANCE OF THE AIRWAY ASSESSMENT SCALE (IPID) FOR THE DIAGNOSIS OF DIFFICULT AIRWAY IN OBESE PATIENTS UNDERGOING GENERAL ANESTHESIA AT THE HOSPITAL GENERAL DE ZONA 33 DE MONTERREY, NUEVO LEÓN. [1] Dr. Israel Flores Solís, physician assigned to the anesthesiology service, Hospital General de Zona 33 Monterrey. [2] Dr. Mara Arísbe Álvarez Tostado García, Third year anesthesiology resident. Introduction: Difficult airway and its definition have been evolving, its evaluation is fundamental to perform an adequate intervention, currently it is defined as the impossibility to provide ventilation or for endotracheal intubation. Objective: To determine the predictive performance of the airway assessment scale (IPID) for the diagnosis of difficult airway in obese patients undergoing general anesthesia at Hospital General de Zona No. 33 in Monterrey, Nuevo Leon. Methods: An observational, analytical, analytical, prolective, cross- sectional, diagnostic test study was carried out to determine the usefulness of the IPID scale in patients with a diagnosis of obesity who had undergone elective laparoscopic cholecystectomy and required the use of general anesthesia. Variables included were sex, age, weight, height and BMI, scores on different scales and attempts required for intubation. For statistical analysis, measures of association (Relative Risk) were used for dichotomous variables, X2 for polytomous variables and Student's T for quantitative variables, to establish dependence between categorical variables. Results: 210 patients were included, with average age, weight, height and BMI of: 50 years, 80 kg, 1.58m and 32.15 kg/m^2. The 92.4% had elective surgery, with diagnosis of LCC (71%). Type II class predominated in Mallampatti (59%) and type I class predominated in Patil-Aldreti (59%); 66.2% were classified as easy in IPID. Intubation was achieved in 93.8% in a single attempt. Sensitivity and NPV of IPID was 100%; specificity 15.1 - 32.5% and PPV 62.9% to 86.3%. Conclusions: The sensitivity of IPID for the diagnosis of difficult area pathway in patients with obesity is greater than 60%, with specificity of 15.1 - 32.5%, considering it as a screening test.