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Electromechanical dissociation. Treatable causes of a dire cardiac emergency
1Cardio Thoracic Centre, All India Institute of Medical Sciences, New Delhi.
Insights
Electromechanical dissociation (EMD) can stem from heart muscle disease or secondary causes like altered heart loading conditions. Early detection of secondary EMD may allow for effective treatment with specific resuscitation drugs.
Area of Science:
- Cardiology
- Critical Care Medicine
Background:
- Electromechanical dissociation (EMD) is a critical condition where the heart's electrical activity is uncoupled from its mechanical function.
- EMD can arise from primary myocardial disease or secondary factors affecting cardiac loading conditions.
Purpose of the Study:
- To delineate the causes and potential treatments for electromechanical dissociation (EMD).
- To highlight the importance of identifying secondary causes of EMD for timely intervention.
Main Methods:
- Review of clinical factors contributing to EMD.
- Analysis of conditions leading to altered cardiac loading.
- Identification of pharmacological agents used in EMD resuscitation.
Main Results:
- Primary EMD results from intrinsic heart muscle disease.
- Secondary EMD is linked to conditions like cardiac tamponade, pulmonary embolism, and outflow obstructions.
- Myocardial ischemia and drug overdose can also precipitate secondary EMD.
Conclusions:
- Secondary EMD, if identified early, may be reversible with appropriate medical management.
- Key resuscitation drugs for EMD include epinephrine, atropine sulfate, and calcium.
Abstract:
Electromechanical dissociation (EMD) may be primary, due to disease of the heart muscle itself, or secondary to alterations in loading conditions of the heart. Factors such as internal hemorrhage, acute cardiac tamponade, tension pneumothorax, acute pulmonary embolism, and inflow or outflow obstructions of the heart may be responsible for changes in loading. Myocardial ischemia, myocardial depressant overdose, and other conditions may also contribute to secondary EMD. If detected early, these secondary forms of EMD may respond to treatment. Drugs for resuscitation of a patient with EMD include epinephrine, atropine sulfate, and, in selected instances, calcium.