Microvascular Angina　- Long-Term Exercise Stress Test Follow-up

Area of Science:

• Cardiology
• Clinical Medicine
• Diagnostic Testing

Background:

• Microvascular angina (MVA) often presents with recurrent symptoms despite normal coronary arteries.
• Previous research has not fully explored the long-term outcomes of exercise stress testing (EST) in MVA patients.
• Understanding the correlation between EST results and symptom progression is crucial for patient management.

Purpose of the Study:

• To investigate the long-term results of exercise stress testing (EST) in patients with primary stable microvascular angina (MVA).
• To determine the correlation between follow-up EST findings and the long-term clinical outcome and symptom status in MVA patients.

Main Methods:

• Follow-up EST was conducted in 71 MVA patients an average of 16.2 years after their initial EST.
• Patients were categorized into two groups based on follow-up EST results: those with exercise-induced ischemia (group 1) and those with negative EST (group 2).
• Angina status was assessed by symptom frequency, nitroglycerin use, and changes in symptoms over time.

Main Results:

• 41 patients (group 1) showed exercise-induced ischemia on follow-up EST, while 30 patients (group 2) had negative EST.
• Group 1 patients exhibited more frequent exercise-induced dyspnea, greater ST-segment depression, and reduced coronary blood flow response.
• Despite differences in EST findings and history of rest angina, no significant differences in angina status or symptom changes were observed between the groups at follow-up.

Conclusions:

• Electrocardiogram (ECG) results showed significant improvement in a notable proportion of MVA patients.
• Changes observed in exercise stress test (EST) results over the long term were not associated with improvements in clinical outcomes or symptom status.
• The study suggests that while EST parameters may change, these alterations do not reliably predict symptom relief in MVA patients.