Table 4.

Fulfilment of ICHD-3 diagnostic subcriteria and proposed subcriteria for headache attributed to ischemic stroke

Diagnostic criteria for headache attributed to ischemic stroke	Fulfilment of diagnostic criteria (number of patients with stroke)
A. ICHD-3 diagnostic criteria
A. Any new headache fulfilling criteria C and D	46
B. Acute ischaemic stroke has been diagnosed	46
C. Evidence of causation demonstrated by either of the following:
C1. Headache has developed in very close temporal relation to other symptoms and/or clinical signs of ischaemic stroke, or has led to the diagnosis of ischaemic stroke	46
C2. Headache has significantly improved in parallel with stabilization or improvement of other symptoms or clinical or radiological signs of ischaemic stroke	25
D. Either of the following:
D1. Headache has resolved within 3 months	25
D2. Headache has not yet resolved but 3 months have not yet passed	21
Total fulfilling ICHD-3 criteria	46
B. Proposed alternative diagnostic criteria
A. Any headache fulfilling B and C	76
B. Acute ischaemic stroke has been diagnosed	76
C. Evidence of causation demonstrated by the following:
C1 A new headache has developed within 24 h of other symptoms and/or clinical signs of ischaemic stroke of other symptoms and/or clinical signs of ischaemic stroke	46
C2 A headache with altered characteristics has developed within 24 h of other symptoms and/or clinical signs of ischaemic stroke of other symptoms and/or clinical signs of ischaemic stroke	30
D. Either of the following:
D1. Headache has resolved within 3 months	25
D2. Headache has not yet resolved but 3 months have not yet passed	51
Total fulfilling proposed criteria	76