Difference between revisions of "Low ECG voltage"

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==Definition==
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==Background==
*QRS < 5 mm in limb leads, or
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===General Causes===
*QRS < 10 mm in chest leads
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*Fluid, fat or air attenuating signal
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*Myocardial infiltration
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*Loss of viable myocardium
  
==Causes==
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==Clinical Features==
*Low electrical power within the heart (e.g. hypothyroidism)
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*Frequently asymptomatic, depends on underlying cause
*Poor electrical conduction within the heart (e.g. sarcoid or scar tissue)
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*Poor conduction of signal from the heart to the ECG lead (e.g. obesity, COPD, pericardial effusion)
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==Differential Diagnosis==
**Low voltage + tachycardia = pericardial effusion until proven otherwise
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[[File:Low_Voltage_ECG.png|thumb|Specific causes of low voltage ECG]]
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===[[Low ECG voltage]]===
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====Cardiac====
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*Post-[[MI]]
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*[[Infiltrative cardiomyopathy]]
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*[[Myocarditis]]
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*[[Hypothyroidism]]
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====Pericardial====
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*[[Pericardial effusion|Effusion]]
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*Constrictive [[pericarditis]]
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*Pneumopericardium
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====Extracardiac====
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*[[COPD]] (limb leads)
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*[[Pneumomediastinum]]
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*[[Pneumothorax]]
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*[[Pleural effusion]]
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*[[Pulmonary edema]]
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*[[Peripheral edema]]
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*Obesity
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==Evaluation==
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[[File:Low voltage ECG.png|thumb|Sample ECG]]
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*[[ECG]]<ref>Madias JE. Low QRS voltage and its causes. J Electrocardiol. 2008;41(6):498–500. doi:10.1016/j.jelectrocard.2008.06.021</ref>
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**QRS < 5 mm in limb leads
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**QRS < 10 mm in chest leads
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==Management==
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*Treat underlying condition
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==Disposition==
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*Depends on underlying condition
  
 
==See Also==
 
==See Also==
 
*[[ECG Basics]]
 
*[[ECG Basics]]
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==External Links==
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*[http://ddxof.com/low-voltage-ecg/ DDxOf: Differential Diagnosis of Low Voltage ECG]
  
 
==References==
 
==References==
 
<references/>
 
<references/>
  
[[Category:Cards]]
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[[Category:Cardiology]]

Latest revision as of 10:43, 22 July 2016

Background

General Causes

  • Fluid, fat or air attenuating signal
  • Myocardial infiltration
  • Loss of viable myocardium

Clinical Features

  • Frequently asymptomatic, depends on underlying cause

Differential Diagnosis

Specific causes of low voltage ECG

Low ECG voltage

Cardiac

Pericardial

Extracardiac

Evaluation

Sample ECG
  • ECG[1]
    • QRS < 5 mm in limb leads
    • QRS < 10 mm in chest leads

Management

  • Treat underlying condition

Disposition

  • Depends on underlying condition

See Also

External Links

References

  1. Madias JE. Low QRS voltage and its causes. J Electrocardiol. 2008;41(6):498–500. doi:10.1016/j.jelectrocard.2008.06.021