Related Experiment Videos
Ventricular pseudo-bigeminy due to sustained myoclonus.
Heart & Lung : the Journal of Critical Care
|November 1, 1976
Summary
This report details a rare case of electrocardiographic artifact mimicking ventricular bigeminy in an elderly patient with myocardial infarction. The artifact, caused by myoclonus, was resolved with succinylcholine chloride, highlighting the importance of differentiating pseudo-arrhythmias.
Area of Science:
- Cardiology
- Clinical Electrophysiology
- Neurology
Background:
- Anteroseptal myocardial infarction can present with complex electrocardiographic (ECG) findings.
- Distinguishing true arrhythmias from artifacts is critical for appropriate patient management.
- Sustained myoclonus is a rare cause of ECG artifact.
Observation:
- An elderly, unconscious patient with anteroseptal myocardial infarction exhibited ventricular pseudo-bigeminy on ECG.
- This artifact appeared to coincide with cardiac contractions but its precise mechanism remained unclear.
- Intravenous succinylcholine chloride administration completely abolished the observed artifact.
Findings:
- The ventricular pseudo-bigeminy was confirmed as an artifact, not a true arrhythmia.
- Sustained myoclonus was identified as the underlying cause of the electrocardiographic artifact.
- Succinylcholine chloride effectively eliminated the artifact, suggesting its neuromuscular blocking properties were key.
Implications:
- Accurate differentiation between true arrhythmias and ECG artifacts is essential to prevent misdiagnosis.
- Misinterpretation of such artifacts can lead to inappropriate and potentially harmful therapeutic interventions.
- This case underscores the need for careful clinical correlation and consideration of non-cardiac causes for unusual ECG patterns.