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|nextpage=Rate | |nextpage=Rate | ||
|nextname=Step 1: Heart Rate | |nextname=Step 1: Heart Rate | ||
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{{authors| | {{authors| | ||
|mainauthor= [[user:Vdbilt|I.A.C. van der Bilt, MD]] | |mainauthor= [[user:Vdbilt|I.A.C. van der Bilt, MD]] | ||
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|moderator= [[user:Vdbilt|I.A.C. van der Bilt, MD]] | |moderator= [[user:Vdbilt|I.A.C. van der Bilt, MD]] | ||
|editor= | |editor= | ||
}} | }} | ||
==How do I begin to read an ECG?== | ==How do I begin to read an ECG?== | ||
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[[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: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.]] | [[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.]] | ||
<gallery> | </gallery> | ||
{{clr}} | {{clr}} | ||