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OBJECTIVE The aim of the study was to measure underdrape oxygen pooling, surgical site oxygen contamination, and time to restoration of 21% oxygen concentration after cessation of oxygen delivery by measuring oxygen concentration under simulated clinical conditions with various drapes. METHODS In a 2-part study, oxygen permeability of four differing surgical drapes was measured (Part A) and a mannequin was used to measure underdrape oxygen pooling and surgical site oxygen contamination (Part . In Part A, a container of high concentra