Low ECG voltage: Difference between revisions
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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 | ||
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*Low voltage + tachycardia = pericardial effusion until proven otherwise | ==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== | ==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