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Non-obstructive carotid atherosclerosis and patent foramen ovale in young adults with cryptogenic stroke.

BACKGROUND AND PURPOSE: Up to 50% of ischaemic strokes in young adults are classified as cryptogenic despite extensive work-up. We sought to evaluate the prevalence of non-obstructive carotid atherosclerosis (NOCA) and its association with patent foramen ovale (PFO) in young adults with cryptogenic stroke (CS).

METHODS: Patients aged 18-54 years, consecutively treated for first-ever CS in an academic stroke service, were included. NOCA was assessed using carotid ultrasound examination and was defined as carotid plaque with <50% stenosis. PFO was diagnosed with transesophageal echocardiography.

RESULTS: A total of 164 patients [mean age (SD) = 43.7 (8.5) years; 104 men] were included. A PFO was found in 79/164 (48.2%) patients. NOCA was demonstrated in 41/164 (25%) patients. NOCA was more common in patients without PFO [37.6% vs. 11.4%, P < 0.001; adjusted odds ratio (95% confidence interval), 0.24 (0.10-0.56)]. Older age (P = 0.046) and subcortical location of cerebral infarct (P = 0.015) were also associated with the absence of PFO, whereas hypertension, diabetes and smoking were not.

CONCLUSIONS: This study demonstrates that NOCA is common in young adults with CS. NOCA is negatively associated with PFO. Detecting NOCA is an important component of stroke investigation in young adults.

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