Table 1. Maastricht classification of NHBDs (10).

Category	Description	Place of death
1	Dead on arrival or dead “in the field”	Outside hospital
2	Unsuccessful resuscitation	In hospital ward, ICU, ER
3	Elective withdrawal of ventilatory support	In ICU or OR
4	Cardiac arrest while brain dead	In ICU or OR

The vast majority of NHBDs are Categories 1 and 2.