Figure 1.

Organ retrieval under Maastricht I, II, and III settings. The Maastricht classification distinguishes four circumstances of organ retrieval after circulatory determination of death (CDD): unforeseeable irreversible circulatory arrest without (category I) or with (category II) immediate cardiopulmonary resuscitation attempted by trained providers (uncontrolled CDD, left-hand side), foreseeable circulatory arrest occurring after a decision to withhold or withdraw life-sustaining treatment (category III or controlled CDD, right-hand size), circulatory arrest occurring after brain death (category IV, not displayed on the panel). Adapted from (8).