Frequency of ischemic stroke
The various stroke subtypes have demonstrated significant variability between different geographical regions as well as different ethnic groups within the same geographic region.1-10 These differences in stroke characteristics have significant impact on strategies of stroke prevention, diagnosis and treatment.
Stroke data banks are helpful in elucidating the risk factors and stroke subtypes in target populations. Although population based studies are superior in answering questions such as incidence and prevalence, hospital based stroke data banks have the advantage of more uniformly evaluating patients with ancillary investigations such as magnetic resonance imaging (MRI), carotid doppler ultrasonography etc. This may result in a more reliable determination of stroke subtype and underlying risk factors.
Stroke is the second most common cause of death!
Stroke is the second most common cause of death world wide13 and the third most common cause of death in the developed world. Strokes cause over 5.5 million deaths annually14 and two thirds of these occur in the developing world.15 The burden of stroke on the society is immense with emotional, financial and functional loss that is difficult to estimate. There is no cost effective curative therapy for stroke and the bulk of public health initiatives are focused on prevention. Prevention of strokes (and indeed diagnosis and therapy) requires an in-depth understanding of the stroke subtypes and etiologic factors which differ by geographic region, and even by ethnicity within the same region. The variation in stroke subtypes is of global relevance in view of the world wide migration of populations.
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