Plasma catecholamines in patients undergoing invasive cardiopulmonary exercise test for exercise intolerance

Area of Science:

• Cardiology
• Exercise Physiology

Background:

• Invasive cardiopulmonary exercise testing (iCPET) assesses exercise intolerance by combining hemodynamic measurements with traditional exercise testing.
• Preload insufficiency (PI) is a cause of exercise intolerance, characterized by low ventricular filling pressures and reduced cardiac output during exertion.

Purpose of the Study:

• To investigate the correlation between plasma catecholamine levels and hemodynamic parameters in patients with PI.
• To determine if catecholamine levels differ at rest and during exercise in patients with and without PI.

Main Methods:

• Adult patients undergoing iCPET for exercise intolerance were included.
• Plasma catecholamines were measured at rest and peak exercise.
• Hemodynamic parameters and exercise workload were analyzed.

Main Results:

• PI was identified in 67.8% of patients.
• PI patients were younger and had lower peak exercise workloads.
• Higher resting heart rate and epinephrine levels were observed in PI patients.
• Epinephrine and norepinephrine at peak exercise directly correlated with peak workload.

Conclusions:

• PI patients exhibit increased sympathetic activity, evidenced by elevated resting heart rate and epinephrine.
• Catecholamine levels appear predominantly influenced by peak workload rather than cardiac filling pressures.
• No significant difference in catecholamine change from rest to peak exercise was found between groups.