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What are the "inferior" heart leads?
II, III, aVF
What are the "septal" heart leads?
What are the "anterior" heart leads?
What are the "lateral" heart leads?
I, aVL, V5, V6
What is lead aVR useful for?
Lead aVR is useful in determining if the electrodes have been properly placed. The QRS complex in lead aVR should be predominately negative, if it's predominately positive either there is significant axis deviation or a cable has been placed on the wrong limb.
What is the difference between a normal and a pathologic Q wave?
A Q wave, if present, is always a negative waveform. In the limb leads a Q wave is < 0.04s in duration and is < 1/3 the amplitude of the R wave. A pathologic Q wave is > 0.04s in duration and = or > than a third of the amplitude of the R wave in that lead.
What is poor R-wave progression?
R waves that decrease in size from V1 to V4.
What is R-wave progression?
The pattern observed in V-leads in which the QRS complex changes from a primarily negative complex to a primarily positive complex in V6. The transition zone occurs in the V3-V4 area.
What is "significant" ST-segment elevation or depression?
If the displacement is more than 1mm and is seen in two or more leads facing the same anatomic area of the heart.
What are causes of right axis deviation?
May be a normal variant in young and thin individuals. Can include mechanical shifts associated with inspiration or emphysema, right ventricular hypertrophy, COPD, WPW syndrome, dextrocardia and pulmonary embolism.
What are some causes of left axis deviation?
May be normal variant in older and obese individuals. Mechanical
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