[ECG changes during a stenocardia attack caused by physical loading]

Area of Science:

• Cardiology
• Clinical Physiology

Background:

• Chronic coronary insufficiency affects a significant patient population.
• Understanding the relationship between ECG changes and anginal symptoms is crucial for patient management.

Purpose of the Study:

• To investigate the occurrence and timing of electrocardiogram (ECG) changes during anginal attacks in patients with chronic coronary insufficiency.
• To evaluate the significance of these ECG changes in assessing coronary circulation reserve.

Main Methods:

• 200 patients with varying degrees of chronic coronary insufficiency underwent dosaged bicycle tests.
• Electrocardiograms (ECG) were monitored during induced anginal attacks.

Main Results:

• ECG changes accompanied anginal attacks in 79.5% of patients.
• These ECG changes consistently preceded the onset of anginal precursors.
• Half of the patients continued the test for at least 2 minutes despite transient ECG changes, reaching anginal precursors.

Conclusions:

• ECG monitoring during stress tests can reveal changes preceding anginal symptoms in chronic coronary insufficiency.
• The ability of some patients to continue exercise despite ECG changes highlights the importance of assessing coronary circulation reserve.
• These findings aid in the evaluation of coronary circulation reserve in patients with chronic coronary insufficiency.