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Cerebral blood flow before and after cardioversion of atrial fibrillation
P Petersen1, J Kastrup, R Videbaek
1Department of Neurology, University Hospital, Rigshospitalet, Copenhagen, Denmark.
Insights
Electrical cardioversion therapy improved cerebral blood flow (CBF) in patients with atrial fibrillation (AF). Restoring sinus rhythm normalized CBF, suggesting AF may contribute to cerebrovascular issues.
Area of Science:
- Neurology
- Cardiology
- Physiology
Background:
- Atrial fibrillation (AF) is linked to increased risk of cerebrovascular complications.
- Cerebral blood flow (CBF) changes in AF patients are not fully understood.
Purpose of the Study:
- To investigate the impact of electrical cardioversion on CBF in patients with recent-onset AF.
- To determine if restoring sinus rhythm normalizes CBF.
Main Methods:
- CBF was measured in nine AF patients before, after, and 30 days post-cardioversion.
- Measurements included initial slope index and end-tidal PCO2.
- CBF data were corrected for variations in end-tidal PCO2.
Main Results:
- Median CBF was initially reduced during AF.
- CBF showed a significant increase one day and 30 days after cardioversion, especially after PCO2 correction.
- Corrected CBF increased from 35.8 to 40.3 (day 1) and 46.7 (day 30).
Conclusions:
- Reduced CBF during AF may be a factor in cerebrovascular complications.
- Electrical cardioversion effectively restores CBF in AF patients.
- Maintaining sinus rhythm is crucial for optimal cerebral perfusion.
Abstract:
In nine patients with atrial fibrillation (AF) of less than 3 months' duration, CBF was measured the day before and after and again 30 days after electrical cardioversion therapy to sinus rhythm. The day before cardioversion therapy, median CBF (expressed as initial slope index 1, ml/100 g.min-1) was 35.8 and the day after it was 37.1. After 30 days in sinus rhythm, CBF was 39.4 (NS), although the end-tidal PCO2 values were lower than the pretreatment values. After correction for changes in end-tidal PCO2, the median CBF had increased significantly from 35.8 to 40.3 on day 1 and to 46.7 on day 30. The reduced CBF during AF could be a contributing factor in the development of cerebrovascular complications in patients with AF.