Table 1:

Patients with intracranial hypotension

Patient	Etiology	EBP	R1	R2	R3
HP 1	SIH	Y	pos	pos	pos
HP 2	SIH	N	pos	pos	pos
HP 3	SP AN	N	pos	pos	pos
HP 4	SIH	Y	neg	pos	pos
HP 5	Post-LP	Y	pos	pos	pos
HP 6	SIH	N	pos	pos	pos
HP 7	SIH	Y	pos	pos	pos
HP 8	SIH	Y	pos	pos	pos
HP 9	SIH	N	pos	pos	pos
HP 10	SIH	N	pos	neg	neg
HP 11	SIH	Y	pos	pos	pos
HP 12	SIH	N	pos	neg	pos
HP 13	SIH	Y	pos	pos	pos
HP 14	SIH	Y	pos	pos	pos
HP 15	Post-LP	Y	pos	pos	pos

Note:—SIH indicates spontaneous intracranial hypotension; pos, positive; neg, negative; Y, yes; N, no; SP AN, spinal anesthetic procedure; EBP, epidural blood patch was performed; R1, R2, R3, the interpretation of the venous distension sign by each reader for each patient; HP hypotension patient; Post-LP, after lumbar puncture.