[Study of cutaneous microcirculation using the laser-Doppler method in syndrome X]

Area of Science:

• Cardiovascular Research
• Microcirculation Physiology
• Vascular Biology

Background:

• Syndrome X, characterized by chest pain despite normal coronary angiograms, remains incompletely understood.
• Generalized microangiopathy, a potential underlying cause, requires further investigation in this patient group.

Purpose of the Study:

• To investigate the relationship between Syndrome X and generalized microangiopathy.
• To assess microvascular circulation parameters in patients with typical and atypical chest pain compared to controls.

Main Methods:

• Laser Doppler Periflux PF3 used to measure microvascular blood flow velocity (FV/CMBC ratio), flux (FV), and concentration of moving blood cells (CMBC).
• Measurements taken at rest, during ischemia, and post-ischemic hyperemia on plantar and dorsal foot regions with varying arterovenous anastomoses.
• Comparison of parameters between 11 Syndrome X patients, 8 atypical chest pain patients, and 12 healthy controls.

Main Results:

• Syndrome X patients showed a significantly higher FV/CMBC ratio (indicating higher flow velocity) at rest and during hyperemia in both foot regions (p < 0.015).
• A significantly lower percent increase in FV and CMBC during hyperemia was observed in the plantar foot region of Syndrome X patients (p < 0.014).
• No significant differences in hyperemia response were noted on the foot dorsum.

Conclusions:

• Elevated microvascular flow velocity and reduced vasodilatory reserve in Syndrome X patients suggest basal arterovenous hyperstomia.
• These findings support a potential link between Syndrome X and generalized microangiopathy.
• Microvascular dysfunction may play a key role in the pathophysiology of Syndrome X.