Better Diagnosis and Treatment Lower Aneurysm Risk

Advances made in diagnosis and treatment over the past 30 years have reduced the risk of patients dying from aneurysmal subarachnoid haemorrhage (the bursting of a blood vessel on the surface of the brain), shows new research from the Netherlands published in the journal Lancet Neurology.

The study, an updated meta-analysis to assess changes in case fatality and morbidity and differences based on age, sex and region, shows that 8 in 100,000 people suffer from aneurysmal subarachnoid haemorrhage (SAH) each year. SAH is also responsible for between 5 and10 percent of incident stroke cases. The research also indicates that around a third of the patients die within 24 hours; over 25% of those who survive are left disabled.

Thanks to improvements in diagnosis like more advanced computed tomography (CT) and magnetic resonance imaging (MRI) techniques for detection of aneurysms, dedicated stroke units and treatments like endovascular coiling of burst aneurysms, physicians have been able to provide better prognoses for patients who are treatable.

However, it was still unclear whether these improved diagnoses, management strategies and stroke units have contributed to curbing the threat of SAH-related death or disability in the general population.

To get answers, Dr Dennis Nieuwkamp of the University Medical Centre Utrecht in the Netherlands and his colleagues conducted a meta-analysis of 33 studies involving 8,739 patients from 19 countries in 5 continents between 1973 and 2002. The results showed that the chance of dying from an SAH dropped from 51% to 35%, regardless of the fact that the average age of patients increased.

"Case fatality varied from 8.3% to 66.7% between studies and decreased 0.8% per year. The decrease was unchanged after adjustment for sex, but the decrease per year was 0.4% after adjustment for age," the study showed. "Case fatality was 11.8% lower in Japan than it was in Europe, the US, Australia and New Zealand." No other regional differences in case fatality were found.

According to the authors, disparities in how quickly patients were admitted to hospital for the early occlusion of the aneurysm could be the determining factor behind the regional differences. "In future, case fatality after SAH might decrease even more, owing to new diagnostic and therapeutic methods," the study reads. "This decrease will probably be limited to the substantial proportion of patients who die before reaching hospital or reach hospital in poor neurological condition."

"To decrease mortality from SAH, the incidence could be further reduced by prevention strategies. In future studies, meta-analysis of individual patient data would be an attractive method to get the best estimates of the rates of decline," the study concludes.

In an accompanying commentary, Drs Rustam Al-Shahi Salman and Cathie Sudlow of the University of Edinburgh in the UK said that while the reduction in case fatality after SAH is cause for optimism, two challenges remain: there is insufficient data on effectiveness of aneurysm treatment in the elderly and on how the results affect low-income to middle-income economies, as they were hardly represented in the meta-analysis.

For further information, please visit:

Copyright ©European Communities, 2009
Neither the Office for Official Publications of the European Communities, nor any person acting on its behalf, is responsible for the use, which might be made of the attached information. The attached information is drawn from the Community R&D Information Service (CORDIS). The CORDIS services are carried on the CORDIS Host in Luxembourg - http://cordis.europa.eu. Access to CORDIS is currently available free-of-charge.

Most Popular Now

Researchers Find Telemedicine may Help R…

Low-value care - medical tests and procedures that provide little to no benefit to patients - contributes to excess medical spending and both direct and cascading harms to patients. A...

AI Revolutionizes Glaucoma Care

Imagine walking into a supermarket, train station, or shopping mall and having your eyes screened for glaucoma within seconds - no appointment needed. With the AI-based Glaucoma Screening (AI-GS) network...

AI may Help Clinicians Personalize Treat…

Individuals with generalized anxiety disorder (GAD), a condition characterized by daily excessive worry lasting at least six months, have a high relapse rate even after receiving treatment. Artificial intelligence (AI)...

Accelerating NHS Digital Maturity: Paper…

Digitised clinical noting at South Tees Hospitals NHS Foundation Trust is creating efficiencies for busy doctors and nurses. The trust’s CCIO Dr Andrew Adair, deputy CCIO Dr John Greenaway, and...

Mobile App Tracking Blood Pressure Helps…

The AHOMKA platform, an innovative mobile app for patient-to-provider communication that developed through a collaboration between the School of Engineering and leading medical institutions in Ghana, has yielded positive results...

AI can Open Up Beds in the ICU

At the height of the COVID-19 pandemic, hospitals frequently ran short of beds in intensive care units. But even earlier, ICUs faced challenges in keeping beds available. With an aging...

Can AI Help Detect Cognitive Impairment?

Mild cognitive impairment (MCI) can be an early indicator of Alzheimer's disease or dementia, so identifying those with cognitive issues early could lead to interventions and better outcomes. But diagnosing...

Customized Smartphone App Shows Promise …

A growing body of research indicates that older adults in assisted living facilities can delay or even prevent cognitive decline through interventions that combine multiple activities, such as improving diet...

New Study Shows Promise for Gamified mHe…

A new study published in Multiple Sclerosis and Related Disorders highlights the potential of More Stamina, a gamified mobile health (mHealth) app designed to help people with Multiple Sclerosis (MS)...

AI Model Predicting Two-Year Risk of Com…

AFib (short for atrial fibrillation), a common heart rhythm disorder in adults, can have disastrous consequences including life-threatening blood clots and stroke if left undetected or untreated. A new study...

Patients' Affinity for AI Messages …

In a Duke Health-led survey, patients who were shown messages written either by artificial intelligence (AI) or human clinicians indicated a preference for responses drafted by AI over a human...

New Research Explores How AI can Build T…

In today’s economy, many workers have transitioned from manual labor toward knowledge work, a move driven primarily by technological advances, and workers in this domain face challenges around managing non-routine...