Seasonal variability in spontaneous cervical artery dissection

Area of Science:

• Neurology
• Vascular Medicine
• Epidemiology

Background:

• Spontaneous cervical artery dissection (sCAD) is a significant cause of stroke, particularly in younger adults.
• Understanding the epidemiological patterns of sCAD is crucial for public health initiatives and preventative strategies.

Purpose of the Study:

• To investigate the seasonal variability in the incidence of spontaneous cervical artery dissection.
• To identify potential correlations between sCAD occurrence and seasonal factors.

Main Methods:

• Analysis of prospectively collected data from 352 patients diagnosed with 380 sCAD events.
• Data spanning from 1985 to 2004 from two university hospitals serving a population of 2,200,000.
• Evaluation of presenting symptoms, including ischemic stroke, transient ischemic attack, and asymptomatic cases.

Main Results:

• A statistically significant seasonal pattern was observed, with a higher frequency of sCAD during winter months (31.3%).
• Winter incidence was significantly higher compared to spring (25.5%), summer (23.5%), and autumn (19.7%).
• The study included various presentations of sCAD, such as carotid and vertebral artery dissections, leading to ischemic stroke or transient ischemic attack.

Conclusions:

• The findings indicate a distinct seasonal variation in sCAD, peaking in winter.
• While the exact cause remains elusive, potential underlying mechanisms may involve winter-associated conditions like infections and hypertension.
• Further research is warranted to elucidate the specific triggers for winter-related sCAD.