INTRODUCTION ICHD-3 criteria for chronic migraine (CM) include a mixture of migraine and tension-type-like headaches and do not account for patients who have a high frequency of migraine but no other headaches. MATERIALS AND METHODS Patients from the Danish Headache Center and their relatives with ICHD-3 defined CM were compared with patients with high frequency episodic migraine (HFEM). Danish registries were used to compare the socioeconomic impact in these two groups. A Russian student population was used to determine the generalizability of the number of patients fulfilling CM and the proposed diagnostic criteria for CM. RESULTS There was no difference in the demographic profile between the two groups in the Danish cohort. The number of lifelong or annual attacks (p > 0.3), comorbid diseases, or self-reported effect of triptans (p = 1) did not differ. HFEM patients purchased more triptans than CM patients (p = 0.01). CM patients received more early pension (p = 0.00135) but did not differ from HFEM patients with regard to sickness benefit (p = 0.207), cash assistance (p = 0.139), or rehabilitation benefit (p = 1). DISCUSSION Patients with HFEM are comparable to CM patients with regard to chronicity and disability. We therefore suggest classifying CM as ≥ 8 migraine days per month (proposed CM), disregarding the need for ≥ 15 headache days per month. The proposed diagnostic criteria for CM approximately doubled the number of patients with CM in both the Danish and the Russian materials. Extending the definition of CM to include patients with HFEM will ensure that patients with significant disease burden and unmet treatment needs are identified and provided appropriate access to the range of treatment options and resources available to those with CM. CONCLUSION Patients with migraine on eight or more days but not 15 days with headache a month are as disabled as patients with ICHD-3 defined CM. They should be included in revised diagnostic criteria for chronic migraine.

中文翻译：

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提出了新的慢性偏头痛诊断标准。

简介慢性偏头痛（CM）的ICHD-3标准包括偏头痛和紧张型头痛的混合体，不能说明偏头痛发生率高但没有其他头痛的患者。材料与方法将丹麦头痛中心的患者及其具有ICHD-3定义的CM的亲属与高频发作性偏头痛（HFEM）患者进行比较。丹麦注册管理机构用于比较这两组的社会经济影响。俄罗斯学生群体用于确定满足CM的患者人数的普遍性以及提议的CM诊断标准。结果在丹麦队列中两组之间的人口统计学特征没有差异。终身或每年发作的次数（p> 0.3），合并症，或曲普坦的自我报告效应（p = 1）相同。HFEM患者购买的曲坦类药物多于CM患者（p = 0.01）。CM患者获得了更多的早期退休金（p = 0.00135），但与HFEM患者在疾病补助（p = 0.207），现金补助（p = 0.139）或康复补助（p = 1）方面没有差异。讨论在慢性和残疾方面，HFEM患者与CM患者相当。因此，我们建议将CM划分为每月≥8个偏头痛天（建议的CM），而不必考虑每月≥15个头痛天。在丹麦和俄罗斯的资料中，建议的CM诊断标准使CM的患者人数大约增加了一倍。将CM的定义扩展到包括HFEM患者，将确保识别出具有重大疾病负担和未满足治疗需求的患者，并为CM患者提供适当的治疗选择范围和资源。结论偏头痛患者每月头痛至少8天但不超过15天，与ICHD-3定义为CM的患者一样被禁用。应将它们纳入修订的慢性偏头痛诊断标准中。