Difference between revisions of "Low ECG voltage"

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==Definition==
 
*QRS < 5 mm in limb leads, or
 
*QRS < 5 mm in limb leads, or
 
*QRS < 10 mm in chest leads
 
*QRS < 10 mm in chest leads
*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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*Low voltage + tachycardia = pericardial effusion until proven otherwise
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==Causes==
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*Low electrical power within the heart (e.g. hypothyroidism)
 +
*Poor electrical conduction within the heart (e.g. sarcoid or scar tissue)
 +
*Poor conduction of signal from the heart to the ECG lead (e.g. obesity, COPD, pericardial effusion)
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**Low voltage + tachycardia = pericardial effusion until proven otherwise
  
 
==See Also==
 
==See Also==

Revision as of 08:08, 18 June 2015

Definition

  • QRS < 5 mm in limb leads, or
  • QRS < 10 mm in chest leads

Causes

  • Low electrical power within the heart (e.g. hypothyroidism)
  • Poor electrical conduction within the heart (e.g. sarcoid or scar tissue)
  • Poor conduction of signal from the heart to the ECG lead (e.g. obesity, COPD, pericardial effusion)
    • Low voltage + tachycardia = pericardial effusion until proven otherwise

See Also