Figure 2 -.

A, Progression of care in developed countries leading from established community level public health and emergency services in support of both secondary and tertiary level critical care services. B, The reality of conditions in many resource-poor countries, where basic emergency and protective public health services are lacking or nonexistent. Where critical care services are available, they are limited primarily to urban academic medical centers. ACLS = Advanced Cardiac Life Support; APLS = Advanced Pediatric Life Support; ATLS = Advanced Trauma Life Support; PALS = Pediatric Advanced Life Support; PICU = pediatric ICU; WHO = World Health Organization.