Difference between revisions of "Low ECG voltage"

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*QRS < 5 mm in limb leads, or
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==Background==
*QRS < 10 mm in chest leads
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===General Causes===
*From either low electrical power within the heart (e.g. hypothyroidism), or low conduction within the heart (e.g. sarcoid or scar tissue), or poor conduction from the heart to the ECG lead (e.g. obesity, COPD, pericardial effusion
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*Fluid, fat or air attenuating signal
*Low voltage + tachycardia = pericardial effusion until proven otherwise
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*Myocardial infiltration
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*Loss of viable myocardium
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==Clinical Features==
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*Frequently asymptomatic, depends on underlying cause
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==Differential Diagnosis==
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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]]
  
[[Category:Cards]]
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==External Links==
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*[http://ddxof.com/low-voltage-ecg/ DDxOf: Differential Diagnosis of Low Voltage ECG]
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==References==
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<references/>
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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