Background: There are no previous controlled studies of sentinel headache in ischemic stroke. The purpose of the present study was to evaluate the presence of such headache, its characteristics and possible risk factors as compared to a simultaneous control group.
Methods: Eligible patients (n=550) had first-ever acute ischemic stroke with presence of new infarction on magnetic resonance imaging with diffusion-weighted imaging (n=469) or on computed tomography (n=81). As a control group we studied in parallel patients (n=192) who were admitted to the emergency room without acute neurological deficits or serious neurological or somatic disorders. Consecutive patients with stroke and a simultaneous control group were extensively interviewed soon after admission using validated neurologist conducted semi-structured interview forms.
Results: Among 550 patients with stroke 94 patients (17.1%) had headache during seven days before stroke and 12 (6.2%) of controls (p<0.001; OR 3.9; 95% CI 1.7-5.8). We defined sentinel headache as a new type of headache or a previous kind of headache with altered characteristics (severe intensity, increased frequency, absence of effect of drugs) within seven days before stroke. Totally 81 patients (14.7%) had sentinel headache within the last week before stroke and one control. Attacks of arrythmia during seven days before stroke were significantly associated with sentinel headache (p=0.04, OR 2.3; 95% CI 1.1-4.8).
Conclusions: A new type of headache and a previous kind of headache with altered characteristics during one week before stroke are significantly more prevalent than in controls. Such sentinel headache should prompt urgent examination for stroke prevention.

Figure 1
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Posted 29 Mar, 2020
On 13 Apr, 2020
Received 13 Apr, 2020
Received 13 Apr, 2020
On 13 Apr, 2020
Received 30 Mar, 2020
On 30 Mar, 2020
On 26 Mar, 2020
Invitations sent on 26 Mar, 2020
On 26 Mar, 2020
On 25 Mar, 2020
On 25 Mar, 2020
On 25 Mar, 2020
Posted 29 Mar, 2020
On 13 Apr, 2020
Received 13 Apr, 2020
Received 13 Apr, 2020
On 13 Apr, 2020
Received 30 Mar, 2020
On 30 Mar, 2020
On 26 Mar, 2020
Invitations sent on 26 Mar, 2020
On 26 Mar, 2020
On 25 Mar, 2020
On 25 Mar, 2020
On 25 Mar, 2020
Background: There are no previous controlled studies of sentinel headache in ischemic stroke. The purpose of the present study was to evaluate the presence of such headache, its characteristics and possible risk factors as compared to a simultaneous control group.
Methods: Eligible patients (n=550) had first-ever acute ischemic stroke with presence of new infarction on magnetic resonance imaging with diffusion-weighted imaging (n=469) or on computed tomography (n=81). As a control group we studied in parallel patients (n=192) who were admitted to the emergency room without acute neurological deficits or serious neurological or somatic disorders. Consecutive patients with stroke and a simultaneous control group were extensively interviewed soon after admission using validated neurologist conducted semi-structured interview forms.
Results: Among 550 patients with stroke 94 patients (17.1%) had headache during seven days before stroke and 12 (6.2%) of controls (p<0.001; OR 3.9; 95% CI 1.7-5.8). We defined sentinel headache as a new type of headache or a previous kind of headache with altered characteristics (severe intensity, increased frequency, absence of effect of drugs) within seven days before stroke. Totally 81 patients (14.7%) had sentinel headache within the last week before stroke and one control. Attacks of arrythmia during seven days before stroke were significantly associated with sentinel headache (p=0.04, OR 2.3; 95% CI 1.1-4.8).
Conclusions: A new type of headache and a previous kind of headache with altered characteristics during one week before stroke are significantly more prevalent than in controls. Such sentinel headache should prompt urgent examination for stroke prevention.

Figure 1
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