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Electrocardiographic changes associated with acute cerebrovascular disease: a clinical review
T P Davis1, J Alexander, M Lesch
1Department of Medicine, Henry Ford Hospital, Detroit, MI 48202.
Insights
Electrocardiogram (ECG) changes are common in acute central nervous system (CNS) vascular disorders but often do not indicate heart damage. Echocardiograms may better identify myocardial damage, guiding therapy for these patients.
Area of Science:
- Cardiology
- Neurology
- Medical Diagnostics
Background:
- Patients with acute central nervous system (CNS) vascular disorders frequently exhibit electrocardiogram (ECG) abnormalities.
- The correlation between ECG findings and actual myocardial dysfunction or damage in these patients is often poor.
- Existing data on the utility of echocardiography for detecting myocardial damage in this population is limited.
Purpose of the Study:
- To investigate the diagnostic value of ECG in predicting myocardial dysfunction or damage in patients with acute CNS vascular disorders.
- To explore the potential mechanisms behind ECG changes in CNS vascular events.
- To evaluate the role of echocardiography in identifying acute myocardial damage and improving patient selection for cardiac therapies.
Main Methods:
- Review of clinical data and diagnostic tests (ECG, echocardiogram) in patients with acute CNS vascular disorders.
- Analysis of the correlation between ECG findings, echocardiographic results, and clinical outcomes.
- Postulation of underlying pathophysiological mechanisms for ECG changes.
Main Results:
- ECG changes are prevalent in acute CNS vascular disorders, but myocardial damage is less common.
- Two primary mechanisms are proposed for ECG changes: autonomic neural stimulation and elevated catecholamines.
- Autonomic stimulation may cause ECG changes without myocardial damage, while catecholamines can lead to damage.
- Current cardiac anti-ischemic therapy, often guided by ECG, may not improve mortality due to poor correlation with actual myocardial damage.
- Echocardiography showing wall motion abnormalities could potentially improve patient selection for therapy, despite limitations in differentiating acute ischemia from remote infarction.
Conclusions:
- ECG findings in acute CNS vascular disorders have questionable predictive value for myocardial dysfunction or damage.
- Autonomic neural pathways and circulating catecholamines are likely mediators of ECG changes.
- Echocardiography may offer a more reliable assessment of myocardial status than ECG.
- Improved patient selection for cardiac anti-ischemic therapy may be achieved through echocardiographic assessment of myocardial function.
Abstract:
Patients with acute vascular disorders of the CNS demonstrate an abundance of both rhythm and morphologic changes in their ECG. Of these a few will demonstrate myocardial dysfunction and or damage. The value of the ECG in evaluating and predicting which patients will have myocardial dysfunction or damage is questionable. One would assume the echocardiogram would be of more help than the ECG in identifying patients with myocardial damage; however, little data are available. The reason for the poor correlation between ECG findings and clinical correlates has not been explained to date, but it is possible to postulate a theory. There are two mechanisms that might mediate ECG changes in these patients, ie, autonomic neural stimulation from the hypothalamus or elevated circulating catecholamines. Hypothalamic stimulation may cause ECG changes without associated myocardial damage whereas elevated catecholamines may result in myocardial damage. This might explain why so many patients have ECG changes and very few have demonstrable myocardial damage in general, or ischemic damage in particular. That cardiac antiischemic therapy does not change mortality may relate to the fact that treatment has been directed towards patients with ECG changes, which in turn do not correlate with myocardial damage. Better patient selection for such therapy might rest upon demonstration of wall motion abnormalities on echocardiogram. The weakness of this strategy is that many patients with stroke have preexisting coronary disease and wall motion abnormalities and thus echo findings may only document remote infarction rather than acute ischemia.