Prevalence of trigeminocervical convergence mechanisms in episodic and chronic migraine

Abstract

Background: Migraine pain location and trigeminocervical convergence have limited diagnostic value and have usually been assessed using non-standard verbal descriptors in a small number of centers. Objective: To use non-verbal descriptors of migraine pain location to determine the prevalence of trigeminocervical convergence mechanisms in patients with episodic and chronic migraine. In addition, we explored the factors associated with the presence of convergence. Methods: A multicenter study was carried out. The explicit pain location was explored by asking subjects to indicate, on an electronic form, three points on the anterolateral side and three points on the posterolateral side of the head and neck that represented the common locations of their migraine pain. We evaluated associations of the pain pattern with demographic and psychological features, comorbidities, lifestyle and other headache characteristics. Results: 97 episodic and 113 chronic migraine patients were included. Convergence was present in 116 migraineurs (55%) who indicated dominance of pain in the posterior cervical region. This site was more often involved in the chronic migraine group (21 vs. 33%; p=0.034). The number of migrainous/altered sensitivity symptoms (OR=1.39; 95%CI 1.14–1.71) was associated with convergence independently of the chronification status. In this symptom group, there were statistical associations between convergence and vomiting (p=0.045), tactile allodynia (p<0.001), nuchal rigidity (p<0.001) and movement allodynia (p=0.031). Conclusions: Trigeminocervical convergence is common in migraineurs and, in practice, it might be found frequently in chronic migraineurs. Some features commonly found in this group, such as altered sensitivity symptoms, are associated with this phenomenon.

RESUMO

Antecedentes: A localização da dor da migrânea e a convergência trigeminocervical têm valor diagnóstico limitado geralmente sendo avaliadas por meio de descritores verbais não padronizados em um pequeno número de centros. Objetivo: Usar descritores não verbais da localização da dor migranosa para determinar a prevalência de mecanismos de convergência trigeminocervical em pacientes com migrânea episódica e crônica. Além disso, exploramos os fatores associados à presença de convergência. Métodos: Um estudo multicêntrico foi realizado. A localização explícita da dor foi explorada solicitando aos migranosos que indicassem, em um formulário eletrônico, três pontos no lado anterolateral e três pontos no lado posterolateral da cabeça e pescoço representando a localização comum de sua dor migranosa. Avaliamos a associação do padrão de dor com características demográficas e psicológicas, comorbidades, estilo de vida e outras características da cefaleia. Resultados: 97 pacientes com migrânea episódica e 113 com migrânea crônica foram incluídos. A convergência esteve presente em 116 migranosos (55%) que indicaram um predomínio da dor na região cervical posterior. Este local estava mais frequentemente envolvido no grupo migrânea crônica (21 vs. 33%; p=0,034). O número de sintomas de migrânea/sensibilidade alterada (OR=1,39; IC95% 1,14–1,71) foi associado à convergência independentemente do estado de cronificação. Nesse grupo de sintomas, houve associações entre convergência e vômito (p=0,045), alodinia tátil (p<0,001), rigidez de nuca (p<0,001) e alodinia ao movimento (p=0,0031). Conclusões: A convergência trigeminocervical é comum em pacientes com migrânea e, na prática, podemos encontrá-la com frequência em pacientes com migrânea crônica. Algumas características comumente encontradas nesse grupo, como sintomas de sensibilidade alterada, estão associadas a esse fenômeno.

Keywords:

Headache - Migraine Disorders - Neck Pain

Palavras-chave:

Cefaleia - Transtornos de Enxaqueca - Cervicalgia

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