Table 3.

Characteristics of the 6 patients with ‘Drop phenomenon’ in the serial change of rSO₂ values.

Case	Sex	Age	Initial rhythm	Witness	Bystander CPR	Administration of adrenaline by ELT	Initial rSO2 value	Prehospital ROSC	Alive at hospital admission	1-month survival	CPC 1 or 2
1*	Female	82	PEA	+	–	+	31.0	Yes	Yes	No	No
2	Male	64	PEA	+	–	+	40.5 (after ROSC)	Yes	No	No	No
3	Male	58	PEA	+	–	–	50.3	Yes	Yes	No	No
4	Male	81	PEA	+	+	–	40.0	Yes	Yes	No	No
5	Male	79	PEA	+	–	–	53.3	Yes	No	No	No
6	Male	95	PEA	+	–	–	51.5 (after ROSC)	Yes	Yes	No	No

CPR, cardiopulmonary resuscitation; CPC, Cerebral Performance Category; ELT, emergency life-saving technician; PEA, pulseless electrical activity; ROSC, return of spontaneous circulation; rSO₂, regional saturation of oxygen.

^*See Fig. 3.