Background and Goal of Study:
 The Royal College of Anesthesiologists of Thailand initiated a registry study of anesthesia and adverse outcomes in Thailand since 2005. In 2015, the Perianesthetic Anesthetic Adverse Events Study in Thailand (PAAd Thai) was conducted to investigate patients, surgical, anesthetic profiles and to determine suggested strategies for prevention of adverse events.
Materials and Methods: A prospective descriptive study was conducted in 22 hospitals across
Thailand. Each hospital was invited to report, on an anonymous and voluntary basis, any perianesthetic adverse incident and monthly statistics of main anesthetics performed between	 
January 1, and December 31, 2015. A standardized incident report form was required to be completed. Reports were analyzed by 3 senior anesthesiologists. Descriptive statistics was used. 
Results and Discussion: Among 333,219 cases, 2,206 incident reports with 3,028 critical incidents were reported. The incidents commonly occurred in male (52.0%), age under 10 y (13.0%), age more than 70 y (18.2%). The incidence of common adverse events were cardiac arrest within 24 h (15.5:10000), death (13.0:10000), oxygen desaturation (13.9:10000), reintubation (11.1:10000), early and late esophageal intubation (8.5:10000), difficult intubation (8.0:10000), severe cardiac arrhythmia (14.0:10000), drug error (3.2:10000), etc. Surgical specialties that posed high risk of incident were general, cardiothoracic, neurological and otorhinolaryngological surgery. Common locations that incidents occurred were operating room, recovery room.
Conclusion(s): Cardiac arrest within 24 h decreased by half within a decade. Common factors related to incidents were inexperience, emergency, inadequate preanesthetic evaluation, inappropriate decision, lack of vigilance and experienced assistant. Suggested corrective strategies were guidelines, quality assurance activity, additional training, improvement of supervision and communication.

Multicenter audit of Perioperative and Anesthetic Adverse events in Thailand (PAAd Thai): mortality and critical incidents