The concept of total ischaemic burden: clinical significance

Area of Science:

• Cardiology
• Clinical Medicine

Background:

• Continuous ambulatory ECG (Holter) monitoring enables quantification of spontaneous myocardial ischaemic episodes during daily activities.
• Myocardial ischaemia often presents as both painful and silent episodes in patients.

Purpose of the Study:

• To introduce and define the concept of total ischaemic burden.
• To assess the severity of ischaemic heart disease by considering the number, duration, and extent of ischaemic episodes over 24 hours.

Main Methods:

• Utilizing continuous ambulatory ECG (Holter) monitoring.
• Quantifying spontaneous ischaemic episodes, including both painful and silent types.

Main Results:

• Patients with positive exercise tests and both silent and symptomatic ischaemic episodes show a higher total ischaemic burden.
• Patients with high-grade stenosis and positive exercise tests, but only silent or no ischaemic episodes, appear to have lower mortality.

Conclusions:

• Prognosis in ischaemic heart disease is primarily determined by the total amount of ischaemia, not solely by the presence or absence of anginal pain.
• The concept of total ischaemic burden provides a more comprehensive assessment of disease severity and patient risk.