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| __NOTOC__
| | #Redirect[[QRS complex]] |
| [[Image:SinusRhythmLabels.png|thumb|Schematic representation of normal ECG]] | |
| {{SI}}
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| {{WikiDoc Cardiology Network Infobox}}
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| {{CMG}}; '''Associate Editor-In-Chief:''' {{CZ}}
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| == Duration ==
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| The precordial leads are approximately 0.01 or 0.02 seconds longer than the standard leads.
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| == Amplitude ==
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| ===Definitions of Low QRS Voltage:===
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| * If the total amplitude above and below the isoelectric line is < 5 mm in all 3 standard leads. <br>
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| * An average voltage in the limb leads of < 5 mm with an average of < 10 mm in the chest leads (1). <br>
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| * Should be at least 5 mm in V1 and V6 , 7 mm in V2 and V5 and 9 mm in V3 and V4. <br><br>
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| ====Causes of Low QRS Voltage:====
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| * Diffuse [[Coronary artery disease]]
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| * [[Congestive heart failure]]
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| * Pericardial effusion (See also [[Diseases of the Pericardium#Electrocardiogram|Diseases of the Pericardium]])
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| * [[Myxedema]]
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| * [[Amyloidosis]]
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| * [[Emphysema]]
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| * [[Obesity]]
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| ===Definition of maximal voltage:===
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| Can be up to 20 to 30 mm in lead 2 and can be up to 25 to 30 mmm in the precordial leads.
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| ==References==
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| {{Reflist|2}}
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| ==Additional resources==
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| * [http://en.ecgpedia.org ECGpedia: Course for interpretation of ECG]
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| * [http://www.anaesthetist.com/icu/organs/heart/ecg/ The whole ECG - A basic ECG primer]
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| * [http://www.ecglibrary.com 12-lead ECG library]
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| * [http://www.ecgsim.org Simulation tool to demonstrate and study the relation between the electric activity of the heart and the ECG]
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| * [http://heartcenter.seattlechildrens.org/what_to_expect/electrocardiogram.asp ECG information from Children's Hospital Heart Center, Seattle]
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| * [http://www.regionalpci-stemi.org/id10.html ECG Challenge from the ACC D2B Initiative]
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| * [http://0-www.nhlbi.nih.gov.innopac.up.ac.za:80/health/dci/Diseases/ekg/ekg_what.html National Heart, Lung, and Blood Institute, Diseases and Conditions Index]
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| * [http://www.ecglibrary.com/ecghist.html A history of electrocardiography]
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| * [http://www.health.gov.mt/impaedcard/issue/issue1/ipc00103.htm EKG Interpretations in infants and children]
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| {{Electrocardiography}}
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| {{Circulatory system pathology}}
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| [[Category:Cardiology]]
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| [[Category:Electrophysiology]]
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| {{WikiDoc Help Menu}}
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| {{WikiDoc Sources}}
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