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Clinical implications of low QRS complex voltage
The Journal of Emergency Medicine
|July 1, 1987
Summary
Low QRS voltage on electrocardiograms (ECG) indicates small electrical signals. While sometimes normal, this finding requires investigating potential heart and systemic diseases.
Area of Science:
- Cardiology
- Diagnostic Electrocardiography
Background:
- Low QRS voltage on a 12-lead surface electrocardiogram (ECG) is defined as an amplitude less than 5 mm in all six standard limb leads.
- This ECG finding can be a normal variant but often signifies an underlying pathological process.
Purpose of the Study:
- To summarize the clinical significance of low QRS voltage on a 12-lead surface ECG.
- To highlight the necessity of investigating potential causes for this finding.
Main Methods:
- Review of existing literature and clinical guidelines regarding low QRS voltage on ECG.
- Analysis of diagnostic criteria and potential etiologies associated with reduced QRS amplitude.
Main Results:
- Low QRS voltage is characterized by diminished electrical signal amplitude in limb leads.
- While not always pathological, it warrants thorough patient evaluation.
- Numerous cardiac conditions (e.g., myocardial infarction, cardiomyopathy) and systemic diseases (e.g., obesity, hypothyroidism, amyloidosis) can manifest with low QRS voltage.
Conclusions:
- Low QRS voltage on a 12-lead ECG is a significant finding that requires careful clinical assessment.
- Identifying the underlying cause is crucial for appropriate patient management and treatment.