Additional decrease in fractional flow reserve in the left anterior descending artery after hand-grip exercise during...

Area of Science:

• Cardiology
• Interventional Cardiology
• Physiology

Background:

• Maximal hyperemia is crucial for accurate fractional flow reserve (FFR) measurements.
• Vasodilators are commonly used to induce hyperemia, but exercise-induced hyperemia occurs naturally during angina.
• The study investigates if pharmacological hyperemia can replace exercise-induced hyperemia in FFR assessment.

Purpose of the Study:

• To evaluate the efficacy of pharmacological hyperemia as a substitute for exercise-induced hyperemia during FFR measurements.
• To assess the impact of combined exercise and pharmacological hyperemia on FFR values.
• To determine the correlation between physiological changes during exercise and FFR variations.

Main Methods:

• Prospective enrollment of 22 patients with intermediate left anterior descending artery (LAD) stenosis.
• FFR measurements were taken under two conditions: pharmacological hyperemia alone and post-exercise hyperemia with pharmacological agents.
• Physiological parameters including systolic blood pressure, heart rate, and cardiac output were monitored during hand-grip exercise.

Main Results:

• Isotonic hand-grip exercise significantly increased systolic blood pressure, heart rate, and cardiac output.
• FFR values significantly decreased after hand-grip exercise combined with pharmacological hyperemia (0.86 to 0.84).
• Increased systolic blood pressure and cardiac output after exercise showed a strong negative correlation with the change in FFR (ΔFFR).

Conclusions:

• Pharmacological hyperemia alone may not fully replicate the hemodynamic conditions of exercise-induced hyperemia during FFR measurement.
• Combined exercise and pharmacological hyperemia can lead to an additional decrease in FFR, particularly in LAD lesions.
• These findings suggest that the combination of exercise and pharmacological hyperemia can alter FFR results, potentially influencing diagnostic and therapeutic decisions.