Lecture 10 Human ECG

Lecture 10 Human ECG - Lecture 10 Human ECG I....

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Lecture 10 Human ECG I. Anatomy/Conduction Recording electrical events in contractile cells While taking signal down, some depolarization is at top of ventricles (gets firm). Get septal depolarization before you get ventricles to depolarize and contract II. Electrodes and Leads A. Frontal leads (limb leads) i. Bipolar (differential recording) (+) (-) Lead I – (LA – RA) Lead II – (LL – RA) Lead III – (LL – LA) ii. Monopolar leads A = augmented V = voltage L = left R = right F = femur (foot) Frontal Axis B. Chest (Precordial) leads Monopolar, not augmented ICS = intercostal space MCL = mid clavicular line V1 – ICS 4 (Right sternal border) V2 – ICS 4 (Left sternal border) V4 – ICS 5 (MCL) V5 – next to V4 V6 – ICS 6 (90º down chart)
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III. Waveforms P wave atrial depolarization 1 st part right atrium 2 nd part left atrium Width < 0.10 seconds Wide atrial disease (see what’s going on)
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Lecture 10 Human ECG - Lecture 10 Human ECG I....

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