Effect of pulse oximetry, age and ASA physical status on the frequency of patients admitted unexpectedly to a postoperative intensive care unit and the severity of their anesthesia-related complications

Cullen DJ, Nemeskal AR, Cooper JB, et al.
Alan M. Zaslavsky
Anesthesia and Analgesia
http://www.ncbi.nlm.nih.gov/pubmed/?term=Effect%20of%20pulse%20oximetry%2C%20age%20and%20ASA%20physical%20status%20on%20the%20frequency%20of%20patients%20admitted%20unexpectedly%20to%20a%20postoperative%20intensive%20care%20unit%20and%20the%20severity%20of%20their%20anesthesia-related%20complications.