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Uses for ECG Monitoring?
- Monitor HR
- Evaluate the effects of disease or injury on heart function
- Evaluate pacemaker function
- Evaluate response to medications
- Obtain baseline recording before, during and after medical procedure
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What information does ECG Monitoring Provided?
- Orientation of the heart in the chest
- Electrical effects of medications and electrolytes
- Mass of cardiac muscle
- Presence of ischemic damage
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What is an ECG lead and how many are there?
- different views of the heart
- there are 12
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What are the different types of views?
- Three standard limb leads
- Three augmented limb leads
- Six precordial limb leads
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P Wave, normal Findings? (Duration, Amplitude, Upright, Inverted, Variable)
- Duration: 0.10 sec (2.5 small boxes)
- Amplitude: 0.5 and 2.5 mm (half to 2.5 small boxes)
- Upright: I, II, avF, V4, V5, V6
- Inverted: aVR
- Variable: III, avL, V1, V2, V3
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what does the ecg record?
electrical activity between two electrodes
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What are the two planes of view?
- Frontal
- Horizontal (transverse)
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What are the Standard limb leads?
- I - left lateral - right shoulder to left hip
- II - inferior - top to bottom
- III - inferior - top to bottom
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Augmented limb leads
- AVR - none
- AVL - lateral
- AVF - inferior
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Precordial Leads?
V1 – V6
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What are the frontal plane leads?
- View: inferior, superior, right and left
- Bipolar Leads I, II, III
- Unipolar leads aVR, aVL, aVF
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What are the horizontal plane leads?
anterior, posterior, right, left
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From what position do all 12 leads view the ventrical?
from the position of its positive electrode
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What is it when you have a Wave of depolarization is towards (+) lead?
then = positive (upright) deflection
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Two deflections of movement away from baseline (+
or -)?
- Biphasic: partly + and –
- Isoelectric: rests on or near abseline
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