Myocardial hibernation
Introduction
Introduction The meaning of myocardial hibernation still includes: 1 myocardial hibernation is an adaptive response of the myocardium to hypoperfusion. 2 hibernating myocardium is alive. 3 hibernating myocardium has a certain functional reserve. When a small dose of positive inotropic drugs is used briefly, myocardial function can be temporarily increased. 4 When myocardial perfusion is restored, myocardial function can be restored.
Cause
Cause
Repeated myocardial oscillation is the mechanism that causes myocardial hibernation. Some authors believe that myocardial oscillations (such as rupture of coronary atherosclerotic plaque, coronary spasm, platelet adhesion in the coronary arteries, aggregation, etc.) can cause delayed recovery of myocardial function. Repeated attacks such as myocardial oscillations can cause a sustained decline in myocardial function. If the myocardial blood supply is not completely restored after myocardial shock, it can cause myocardial hibernation.
Examine
an examination
Related inspection
ECG oxygen saturation
1 The hypoperfusion state of the myocardium, that is, the reduction of local myocardial resting blood flow.
2 myocardial function decline, including myocardial contraction and diminished diastolic function.
3 Restoration of myocardial function recovery after perfusion. This third point is especially important.
Diagnosis
Differential diagnosis
Hibernating myocardium has a transient increase in myocardial contractility after administration of catecholamines, which is the most important difference between hibernating myocardium and necrotic myocardium.
The diagnosis of myocardial hibernation includes three aspects:
1 The hypoperfusion state of the myocardium, that is, the reduction of local myocardial resting blood flow.
2 myocardial function decline, including myocardial contraction and diminished diastolic function.
3 Restoration of myocardial function recovery after perfusion. This third point is especially important. Some authors see it as the gold standard for diagnosing myocardial hibernation. However, this is a retrospective diagnosis, so the initial diagnosis of myocardial hibernation should be made according to the first two, and a clear diagnosis should be made after the reperfusion.
