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1 byte added, 20:05, 8 May 2009
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|nextpage=Rate
|nextname=Step 1: Heart Rate
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{{authors|
|mainauthor= [[user:Vdbilt|I.A.C. van der Bilt, MD]]
|moderator= [[user:Vdbilt|I.A.C. van der Bilt, MD]]
|editor=
}}
}}
==How do I begin to read an ECG?==
[[Image:cells_in_rest_en.png|thumb|left|In rest the heart cells are negatively charged. Through the depolarization by surrounding cells they become positively charged and they contract.]]
[[Image:Ion_currents_en.png|thumb|During the depolarization sodium-ions stream inwards the cell. Subsequently the calcium-ions stream into the cell. These calcium-ions give the actual muscular contraction. Finally the potassium-ions stream out of the cell. During the repolarisation the ion concentration is corrected. On the ECG, an action potential wave coming towards the electrode is shown as a positive (upwards) signal. Here the ECG electrode is represented as an eye.]]
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