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Timing and triggers of transient myocardial ischemia
1Mount Sinai Medical Center, Cleveland, Ohio 44106-4198.
Insights
New monitoring techniques reveal transient ischemic events in coronary artery disease patients share a morning pattern with heart attacks and strokes. Understanding these reversible events may clarify causes of sudden cardiac death.
Area of Science:
- Cardiology
- Cardiovascular Research
- Clinical Medicine
Background:
- Coronary artery disease (CAD) patients experience transient ischemic events.
- These events exhibit a diurnal pattern, particularly in the morning.
- This pattern mirrors that of major cardiovascular events like myocardial infarction, stroke, and sudden cardiac death.
Purpose of the Study:
- To investigate the characteristics and diurnal patterns of transient ischemic events in CAD patients.
- To explore the relationship between triggers of reversible myocardial ischemia and those causing catastrophic cardiovascular events.
Main Methods:
- Utilizing exercise tolerance testing.
- Employing new techniques for ambulatory electrocardiographic monitoring.
- Objectively measuring myocardial ischemia to assess magnitude, timing, and characteristics of ischemic events.
Main Results:
- Clinicians can now better recognize the magnitude, timing, and variable characteristics of transient ischemic events.
- A diurnal pattern, similar to catastrophic cardiovascular events, was observed for these transient ischemic events.
- The study highlights a parallel increase in morning activity for both reversible ischemia and major adverse cardiovascular events.
Conclusions:
- While the exact triggers remain unresolved, the shared diurnal pattern suggests a link between reversible myocardial ischemia and major cardiovascular events.
- Understanding the triggers of transient ischemic events may provide insights into the causes of myocardial infarction, sudden cardiac death, and stroke.
- Further research into the factors contributing to reversible ischemia could improve prevention and management strategies for CAD.
Abstract:
Use of exercise tolerance testing and new techniques of ambulatory electrocardiographic monitoring to more objectively measure myocardial ischemia have enabled clinicians to better recognize the magnitude, timing and variable characteristics of transient ischemic events. These commonly occurring events in patients with coronary artery disease have a diurnal pattern strikingly similar to that reported for catastrophic cardiovascular events such as myocardial infarction, sudden cardiac death and stroke. Whether those factors that contribute to reversible ischemic events are similar to those causing infarction and sudden death has not been resolved. However, the parallel increase in morning activity for these related phenomena suggests that a better understanding of the triggers of reversible myocardial ischemia may help improve understanding of the causes of myocardial infarction and sudden cardiac death.