Cerebral computed tomography in paroxysmal atrial fibrillation

Area of Science:

• Neurology
• Cardiology
• Radiology

Background:

• Atrial fibrillation (AF) is a known risk factor for stroke.
• Chronic AF patients often exhibit asymptomatic cerebral infarcts on CT scans.
• The risk of silent infarcts in paroxysmal AF remains unclear.

Purpose of the Study:

• To determine the frequency of asymptomatic cerebral infarcts in patients with paroxysmal atrial fibrillation.
• To compare the prevalence of these lesions between paroxysmal AF patients and matched controls in sinus rhythm.
• To assess the association between paroxysmal AF and silent cerebrovascular lesions.

Main Methods:

• Computed tomography (CT) scans were performed on 30 patients with paroxysmal AF.
• 30 matched controls in sinus rhythm, without cerebrovascular disease history, were included.
• CT findings of low-density areas suggesting old infarcts were analyzed.

Main Results:

• 13% of paroxysmal AF patients had abnormal CT scans indicative of silent infarcts.
• 10% of control subjects also showed similar abnormal CT findings.
• No significant difference in the number or size of these lesions was found between the paroxysmal AF group and the control group.

Conclusions:

• Paroxysmal AF does not appear to increase the risk of silent cerebral infarcts compared to sinus rhythm.
• The findings support the clinical observation of a low stroke risk in paroxysmal AF.
• Further research may elucidate the specific mechanisms underlying stroke risk in different AF types.