Erythromelalgia: a clinical study of 87 cases

Area of Science:

• Medical research
• Clinical medicine
• Dermatology

Background:

• Erythromelalgia (EM) is a rare condition characterized by episodic erythema, warmth, and pain, primarily affecting the extremities.
• Understanding the aetiology, clinical presentation, and prognosis of EM is crucial for effective patient management.
• This study presents the largest cohort of EM patients reported in Western literature, offering valuable insights into the condition.

Purpose of the Study:

• To investigate the aetiological factors, clinical findings, and long-term prognosis of 87 patients diagnosed with erythromelalgia (EM).
• To provide a comprehensive analysis of EM based on the largest reported patient cohort in the Western literature.
• To characterize the natural history and outcomes of different subtypes of EM.

Main Methods:

• Retrospective analysis of 87 patients diagnosed with erythromelalgia.
• Data collection included aetiological factors, clinical manifestations, and treatment outcomes.
• Follow-up extended up to 11 years with a 100% follow-up rate.

Main Results:

• The cohort comprised 61 females and 26 males, with approximately two-thirds presenting with primary EM and three-quarters having a chronic condition.
• Erythromelalgia was more frequently observed in lower extremities compared to upper extremities.
• Prognosis varied significantly by EM subtype: acute EM (primary and secondary) showed improvement, EM syndrome progressively worsened, and chronic EM (primary and secondary) remained stable.

Conclusions:

• The prognosis of erythromelalgia is dependent on its subtype, with distinct trajectories for acute, chronic, and EM syndrome forms.
• This study provides a substantial contribution to the understanding of EM's natural history and diverse clinical outcomes.
• Further research into specific aetiological factors and targeted therapies for different EM subtypes is warranted.