Takotsubo Syndrome: Echocardiographic Differentiation from ACS
The provided source fragments do not contain direct data on specific echocardiographic criteria for Takotsubo syndrome (apical ballooning) and its differentiation from acute coronary syndrome. Below are only the statements contained in the sources applicable to the assessment of myocardial regional contractility.
Terminology of Wall Motion Abnormalities
According to the textbook "Echocardiography: Basic Level" (B.V. Blagodir, 2024), the following terms are used in the assessment of regional contractility:
| Term | Definition | Clinical Significance |
|---|---|---|
| Hyperkinesis | Excessive wall motion | — |
| Hypokinesis | Reduced wall motion | — |
| Akinesis | Absence of wall motion or thickening | Indicator of myocardial infarction or hibernation |
| Hibernation | Akinesis of an ischemic segment, but not infarction | Recovery of contractility upon restoration of coronary blood flow |
| Dyskinesis | Wall motion directed away from the cavity center | Reliable sign of myocardial infarction |
Limitations of Echocardiography in Differential Diagnosis
According to the source, echocardiography does not allow differentiation between hibernation and myocardial infarction; the presence of a chronic myocardial infarction in history helps clarify the cause. Normally, the walls of the left ventricle concentrically contract during systole, with the wall thickening by more than 30%. Lack of wall thickening/contraction is an indicator of ischemic heart disease and may be global or regional (wall motion abnormality).
In myocardial ischemia, diastolic dysfunction appears and systolic function decreases.
Additional Assessment Methods
According to EACVI/ASE (2020), strain echocardiography and wall motion score index predict the final infarct size in patients with non-ST elevation myocardial infarction. [clarification: specific threshold values for diagnosing Takotsubo are not provided in the sources].
Frequently asked questions
Does echocardiography distinguish reversible dysfunction from infarction?
According to the source, echocardiography does not differentiate between hibernation and myocardial infarction. The presence of a chronic myocardial infarction in history helps clarify the cause.
Which contractility abnormality is a reliable sign of infarction?
Dyskinesis — wall motion directed away from the cavity center — is a reliable sign of myocardial infarction.
What is hibernation and how does it differ from infarction?
Hibernation is akinesis of an ischemic segment without infarction; the segment recovers contractility upon restoration of coronary blood flow.
What wall thickening of the LV is considered normal?
Normally, the left ventricular wall thickens by more than 30% during systole. Lack of thickening indicates ischemic heart disease.
Are there specific echo-criteria for Takotsubo in the sources?
No, specific criteria for apical ballooning in Takotsubo syndrome are not described in the provided fragments [clarification].