Raynaud's phenomenon in Northern Sweden: a population-based nested case-control study.

Area of Science:

• Environmental Health
• Occupational Medicine
• Dermatology

Background:

• Raynaud's phenomenon is a condition characterized by exaggerated vasoconstriction of extremities in response to cold or stress.
• Understanding the association between environmental and occupational exposures and Raynaud's phenomenon is crucial for prevention and management.
• The role of cold sensitivity as a modifier in this association requires further investigation.

Purpose of the Study:

• To investigate the association between individual and external exposure factors and the reporting of Raynaud's phenomenon.
• To explore the influence of concomitant cold sensitivity on these associations.
• To identify key risk factors for Raynaud's phenomenon in a population-based cohort.

Main Methods:

• A population-based nested case-control study design was employed.
• Cases (n=578) with Raynaud's phenomenon and matched controls (n=1156) completed a questionnaire on risk factors.
• Univariate and multiple conditional logistic regression analyses were performed, stratified by cold sensitivity status.

Main Results:

• Previous frostbite affecting the hands showed the strongest association with Raynaud's phenomenon (OR 12.44 with cold sensitivity, OR 4.01 without).
• Upper extremity nerve injury was associated with Raynaud's phenomenon and cold sensitivity (OR 2.23) but not Raynaud's phenomenon alone.
• Hand-arm vibration and cumulative cold exposure were significant in univariate but not multiple models for Raynaud's phenomenon with cold sensitivity.

Conclusions:

• Raynaud's phenomenon is strongly linked to prior cold injury, particularly in individuals who also report cold sensitivity.
• The findings suggest a potential neural basis for cold sensitivity, as indicated by the association with upper extremity nerve injury.
• Previous frostbite is a significant risk factor for developing Raynaud's phenomenon.