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Microembolic Air Load During Contrast-Transcranial Doppler: A Trigger for Migraine With Aura?

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Abstract:

(Headache 2010;50:1320-1327) Background.—

There is a well-known association between migraine with aura (MA) and right-to-left shunt (RILES) because of patent foramen ovale (PFO). The occurrence of MA attacks after microbubble (MB) injection during contrast-enhanced transcranial Doppler (ce-TCD) has been recently described. Objectives.—

The aim of this study was to analyze the prevalence of RILES in a consecutive cohort of MA patients and to characterize the occurrence of MA attacks after diagnostic ce-TCD. Methods.—

A total of 159 consecutive MA patients underwent ce-TCD with air-mixed saline to disclose RILES. RILES was characterized in terms of MB amount (small-moderate or large) and occurrence at rest and/or during Valsalva maneuver (permanent or latent). Results.—

RILES was revealed in 79/159 patients (∼50%). Permanent RILES were detected in 56/79 (71%) and latent RILES in 23/79 (29%) MA patients. The occurrence of a typical MA attack was overall observed in 12/159 patients (7.5%; 95% CI: 4-12.8%), but arose only in RILES-positive ones, immediately after ce-TCD (12/79; 15.2%; P < .001). All 12 patients had permanent RILES (12/56; 21.4%; P = .015) and MA attack was mostly observed in large RILES-positive patients, even without statistical significance (P = .118). Conclusions.—

Microembolic air load could act as a trigger of MA attack. According to recent studies and to the clinical characteristics observed in our patients, microembolization because of MB injection might provoke a decrease in cerebral oxygen saturation, thus triggering cortical spreading depression and, thereafter, MA attack. Larger and prospective studies will be necessary to confirm our data and observe a wider correlation.

Keywords: Transcranial Doppler; aura; embolism; migraine; ultrasound

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1526-4610.2010.01621.x

Publication date: September 1, 2010

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