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10.-ECG.docx - ELECTROCARDIOGRAM - - - - The process of ECG...

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ELECTROCARDIOGRAM-The process of ECG is by using anelectrocardiography. It is a graph of voltageversus time of the electrical activity of theheart.-Foryoutoarrivewiththeelectrocardiography, so you will be usingelectrodes that are usually placed on theskin.-These electrodes detect the electricalchanges that are in consequence of thecardiac muscle, depolarization, thenfollowed by the repolarization during eachcardiac cycle.-If there are changes in biencephatom? Forexample, we have cardiac disturbancesthat atrial fibrillation or ventricular fibrillationor tachycardia, so this will be seen on theresult of your ECG.Action potentials conducted through theheart during the cardiac cycle produce electricalcurrents that can be measured at the surface ofthe body. Electrodes placed on the bodysurface and attached to a recording device candetect the small electrical changes resultingfrom the action potentials in all of the cardiacmuscle cells. The record of these electricalevents is anelectrocardiogram (ECG or EKG)(figure 12.16).Thenormal ECGconsists of:(the three main components of the ECG)1.P waveoRepresents thedepolarization oftheatria2.QRS complexoRepresents thedepolarization ofthe ventricles3.T waveoRepresents therepolarization of theventriclesPR Interval-It is the time from theonset of the P waveto thestart of the QRS complex. It reflectsconduction through theAV node. Thenormal PR intervalisbetween 120 - 200ms(0.12 – 0.20s) in duration (three to fivesmall squares)PQ Interval-Measurement should start at thebeginning

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Term
Fall
Professor
N/A
Tags
Cardiology, Atrial fibrillation, Cardiac electrophysiology, Ventricular fibrillation

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