Background: Individuals with migraine present ictal elevation of endothelin-1 levels. Migraine can be subclassified into episodic migraine and chronic migraine. Apart from the inconsistent reports on interictal endothelin-1 levels, most studies did not distinguish between episodic migraine and chronic migraine.
Methods: We measured plasma endothelin-1 levels in participants with episodic migraine (n = 87), with chronic migraine (n = 88), and controls (n = 50).
Results: Interictal endothelin-1 levels were not significantly different among participants with episodic migraine, those with chronic migraine, and controls (pg/ml, median and interquartile range, 10.19 [7.76-13.69] vs. 9.25 [6.91-10.73] vs. 9.46 [7.00-14.19], = 0.131). After excluding participants with fibromyalgia (n = 50) and medication-overuse headache (n = 21), endothelin-1 levels were still similar among groups (10.51 [7.96-14.10] vs. 9.24 [6.96-10.81] vs. 9.46 [7.00-14.19], = 0.230). Endothelin-1 levels did not significantly differ among participants with migraine with aura, those with migraine without aura, and controls (9.36 [4.26-13.35] vs. 9.50 [7.23-13.02] vs. 9.46 [7.00-14.19], = 0.975). There was no significant association of endothelin-1 with headache intensity (mild, 8.99 [8.99-8.99] vs. moderate, 8.71 [6.85-12.15] vs. severe, 9.55 [7.23-13.13], = 0.517) or headache frequency per month (exponential and 95% confidence interval, 0.709 [0.296-1.698], = 0.440) in participants with episodic migraine and chronic migraine.
Conclusions: Interictal plasma endothelin-1 level is an unlikely marker for episodic migraine and chronic migraine.
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