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[Atrial fibrillation and cerebral infarct]
A Muiño Míguez1, V J González Ramallo, E Rodríguez de Castro
1Sección de Medicina de Urgencias, Hospital General Gregorio Marañón, Madrid.
Insights
Atrial fibrillation (AF) increases cerebral infarction (CI) risk, likely via embolism. However, non-valvular AF may also involve atherothrombotic mechanisms, suggesting alternative CI causes in these patients.
Area of Science:
- Neurology
- Cardiology
- Pathogenesis of Stroke
Context:
- Atrial fibrillation (AF) is a known risk factor for cerebral infarction (CI).
- The exact mechanisms linking AF to CI, beyond cardiac embolism, require further investigation.
- Understanding these mechanisms is crucial for stroke prevention strategies.
Purpose:
- To analyze the characteristics of patients with CI, differentiating between those in sinus rhythm (SR) and AF.
- To investigate the prevalence of traditional risk factors (RF) in CI patients with different cardiac rhythms.
- To hypothesize about the underlying pathogenetic mechanisms of CI in AF patients.
Summary:
- A study of 250 CI patients (204 SR, 46 AF) examined RF prevalence and initial blood tests.
- Valvular AF patients had lower RF but higher mortality, suggesting an embolic mechanism.
- Non-valvular AF patients showed similar RF and mortality to SR patients, indicating a potential non-embolic, possibly atherothrombotic, mechanism.
Impact:
- Suggests that atherothrombosis may contribute significantly to CI in a substantial proportion of non-valvular AF patients.
- Highlights the need to consider diverse pathogenetic pathways for CI in AF.
- Informs potential refinements in stroke risk stratification and prevention for AF populations.
Abstract:
The importance of atrial fibrillation (AF) as a risk factor (RF) for cerebral infarction (CI) is well-known. It is probably caused by cardiac embolism but other explanations can also justify this association. Our aim was to analyse the features of the patients with CI and AF and sinus rhythm (SR), as well as to form hypotheses as regards the pathogenesis. 250 patients with CI, 204 in RS and 46 in AF (31 non-valvular and 15 associated to a valvular disease) were studied, analysing the prevalence of RF and initial blood tests. The group of patients with valvular AF of probably embolic mechanism had a minor prevalence of RF (hypertension, diabetes, smoking, alcoholism) but higher mortality. The group with non-valvular AF, had a lower RF prevalence compared to the SR group (non-embolic mechanism), without statistical significance and with a similar mortality rate. We concluded that the atherothrombotic mechanism can be the cause of a considerable proportion of CI in patients with non-valvular AF.