Laser Doppler imaging evaluation of nitroglycerin patch application in systemic sclerosis patients

Area of Science:

• Vascular Medicine
• Dermatology
• Rheumatology

Background:

• Systemic sclerosis (SSc)-associated Raynaud phenomenon (RP) involves microvascular dysfunction.
• Topical nitroglycerin (NTG) is being explored for managing SSc-associated RP.

Purpose of the Study:

• To evaluate the microvascular response to a topical NTG patch on the hand in SSc patients.
• To assess the efficacy of NTG in improving blood flow and cold challenge response in SSc-associated RP.

Main Methods:

• Laser Doppler imaging (LDI) measured fingertip and metacarpal blood flow in 21 SSc patients and 13 controls.
• Nailfold capillaroscopy (NC) assessed microvascular morphology.
• A cold challenge was administered before and after NTG patch application.

Main Results:

• SSc patients exhibited reduced baseline fingertip perfusion and exaggerated vasoconstriction to cold compared to controls.
• NTG patch application increased blood flow and hand temperature in SSc patients.
• NTG facilitated faster reperfusion post-cold challenge, with response magnitude linked to functional, not structural, vascular features.

Conclusions:

• Topical NTG patches induce vasodilation and offer protection against cold challenges in SSc patients.
• The study supports further investigation of NTG patches as a therapeutic option for SSc-associated RP.