Aneurysmal Subarachnoid Hemorrhage: Geography has a Role

Area of Science:

• Neurology
• Epidemiology
• Neurosurgery

Background:

• Aneurysmal subarachnoid hemorrhage (SAH) incidence varies globally, with debates on geographical differences versus diagnostic accuracy.
• Previous studies suggest potential geographical variations in SAH incidence, but data from India remains limited.
• Understanding these variations is crucial for accurate epidemiological assessments and healthcare resource allocation.

Purpose of the Study:

• To investigate geographical variations in the incidence of aneurysmal SAH.
• To determine if the incidence of aneurysmal SAH is lower in India compared to reported Western literature.
• To assess the prevalence of aneurysms as a cause of SAH in the Indian subcontinent.

Main Methods:

• Retrospective analysis of 182 consecutive SAH cases admitted between March 1999 and July 2003.
• Data collection included patient demographics, hypertension status, and diagnostic angiograms.
• Four-vessel angiograms were performed on 113 patients to identify aneurysms.

Main Results:

• The study included 182 patients (84 females, 98 males).
• Hypertension was prevalent, affecting over half the patients.
• Of 113 patients who underwent four-vessel angiography, 69 had normal results; 65% of hypertensive patients with angiograms had normal findings.

Conclusions:

• The incidence of aneurysmal rupture as a cause of SAH is significantly lower in India compared to Western countries.
• This study supports the existence of geographical variations in aneurysmal SAH incidence.
• Fewer aneurysms causing SAH in India may allow for better targeting of healthcare resources toward more prevalent pathologies.