Table 2.

Etiology of RSE in selected studies.

Study	N	Known (%)			Unknown (%)
		Acute	Remote	Progressive
Delaj et al. (RSE versus NRSE)^ [21]	RSE = 301	58.5	12.6#	20.9	8.6
Delaj et al. (RSE versus SRSE)^ [21]	RSE = 268 SRSE = 33	51.6	15.2	18.2	9
Holtkamp et al. [3]	36	50∗	22.2	16.7	0
Giovannini et al. [10]	26	77∗	12	4	0
Kantanen et al. [16]	75	41	51	5	3

^#NRSE was significantly more likely to have a remote etiology as compared to RSE; ^∗RSE was significantly more likely to have an acute etiology as compared to NRSE; ^Delaj et al. differentiated RSE and SRSE cases in their cohort (RSE = refractory status epilepticus and NRSE = nonrefractory status epilepticus).