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[Cardiogenic shock in acute myocardial infarct patients]
Insights
Cardiogenic shock (CS) is more common in older patients with a history of myocardial infarction (MI). Tissue oxygen extraction on day one is a key prognostic indicator for CS patients.
Area of Science:
- Cardiology
- Critical Care Medicine
Background:
- Cardiogenic shock (CS) complicates acute myocardial infarction (MI).
- Differentiating CS types and establishing prognostic criteria are crucial for patient management.
Purpose of the Study:
- To classify different forms of cardiogenic shock.
- To identify prognostic criteria for cardiogenic shock following myocardial infarction.
Main Methods:
- Analysis of 284 patients with acute MI and 30 controls.
- Evaluation of clinical course, hemodynamic parameters, and tissue oxygen supply.
- Assessment of hemodynamic responses to sympathomimetic amines.
Main Results:
- CS incidence increased in patients >64 years, with prior MI, and chronic heart failure (CHF) stage IIA.
- Late CS often presented as true cardiogenic shock, linked to MI relapse.
- Reflex CS showed hyperkinetic hemodynamics; arrhythmic CS exhibited a congestive variant.
- Patients with true CS were sub-classified based on hemodynamic response to sympathomimetics.
Conclusions:
- Tissue oxygen extraction coefficient on day one is a significant prognostic criterion for CS.
- Dynamic monitoring of cardiac function alongside oxygen extraction aids prognosis.
Abstract:
To differentiate between various forms of cardiogenic shock (CS) and to elaborate the criteria of its prognosis, the authors examined 284 patients with acute myocardial infarction (MI) and 30 patients of the control group for the peculiarities of the clinical course of the disease in relation to changes in the hemodynamic parameters and oxygen supply to the tissues. CS was shown to develop more frequently in patients over 64 years of age, with a history of MI and with signs of chronic circulation insufficiency of IIA stage. Late CS more commonly took the true form and was associated with a MI relapse. Reflex CS was characterized by the hyperkinetic variant of the hemodynamics while an arrhythmic one by the congestive variant. Patients with the authentic form of CS were divided into 3 subgroups with different hemodynamic reactions to sympathomimetic amines. In the first day of the disease the coefficient of the tissue extraction of oxygen serves as a significant prognostic criterion which should be determined along with the dynamic measurement of the pump and contractile functions of the heart.