QRS interval: Difference between revisions
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== Amplitude == | == Amplitude == | ||
===Definitions of Low Voltage:=== | ===Definitions of Low QRS Voltage:=== | ||
* If the total amplitude above and below the isoelectric line is < 5 mm in all 3 standard leads. <br> | * If the total amplitude above and below the isoelectric line is < 5 mm in all 3 standard leads. <br> | ||
* An average voltage in the limb leads of < 5 mm with an average of < 10 mm in the chest leads (1). <br> | * An average voltage in the limb leads of < 5 mm with an average of < 10 mm in the chest leads (1). <br> | ||
Revision as of 14:24, 11 August 2012
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]
Duration
The precordial leads are approximately 0.01 or 0.02 seconds longer than the standard leads.
Amplitude
Definitions of Low QRS Voltage:
- If the total amplitude above and below the isoelectric line is < 5 mm in all 3 standard leads.
- An average voltage in the limb leads of < 5 mm with an average of < 10 mm in the chest leads (1).
- Should be at least 5 mm in V1 and V6 , 7 mm in V2 and V5 and 9 mm in V3 and V4.
Causes of Low QRS Voltage:
- Diffuse Coronary artery disease
- Congestive heart failure
- Pericardial effusion (See also Diseases of the Pericardium)
- Myxedema
- Amyloidosis
- Emphysema
- Obesity
Definition of maximal voltage:
Can be up to 20 to 30 mm in lead 2 and can be up to 25 to 30 mmm in the precordial leads.
References
Additional resources
- ECGpedia: Course for interpretation of ECG
- The whole ECG - A basic ECG primer
- 12-lead ECG library
- Simulation tool to demonstrate and study the relation between the electric activity of the heart and the ECG
- ECG information from Children's Hospital Heart Center, Seattle
- ECG Challenge from the ACC D2B Initiative
- National Heart, Lung, and Blood Institute, Diseases and Conditions Index
- A history of electrocardiography
- EKG Interpretations in infants and children