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Table 4 Summary of studies on patients with sudden headache

From: A common cause of sudden and thunderclap headaches: reversible cerebral vasoconstriction syndrome

 

Current study

Perry[5]

Landtblom[4]

Linn[3]

Harling[26]

SAH

3.3%

6.2%

11.3%

25%

71.4%

No diagnosis

19.4%

57.7%

73.0%

62.8%

2.0%

(3.3%)*

Onset

sudden

< 1 hour

sudden

< 1 minute

sudden

Intensity

NS

NS

NS

Severe

NS

Duration

> 1 minute

NS

NS

> 1 hour

NS

Onset to visit

< 30 days

< 14 days

NS

NS

NS

Settings

Clinic

Emergency department

Emergency department

Clinic and emergency

In-hospital

Follow up

6-42 months

6 months

12 months

12 months

18-30 months

Further SAH

0

0

0

0

0

  1. SAH: subarachnoid hemorrhage; NS: not specified.
  2. *When we conducted the study, patients with multiple triggers could not be classified by the criteria of International Classification of Headache Disorders, 2nd edition (ICHD-2) (Table 1). However, five of these six patients may be categorized as probable reversible cerebral vasoconstriction syndrome by the criteria of ICHD-3, beta version (Table 1) (Figure 2).