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Phys2 ECG vector

QuestionAnswer
What are the clinical uses of a vector when looking at ECGs? it is an arrow symbolizing the direction of depolarization that can be used for: 1.Change in heart mass (Hypertrophy). 2.Alteration of dipoles (infarction).
Which chamber of the heart contributes the most to the MEAN QRS vector (the sum of all the vectors)? Left ventricle, b/c it has the most mass
what direction is septal depolarization? Left to Right
Where does the tail of the vector always start? Where does the tip of the vector go? Tail: AV node. Tip: intersection of all three leads QRS amplitudes.
What are the two methods for quantitating the direction of the vectors? 1.Triaxial (Only leads I, II, and III). 2.Hexaxial (All 6 vertical leads)
upward and downward QRS from a hexaxial reference: Lead I Upward: Towards 0. Downward: Towards +180
upward and downward QRS from a hexaxial reference: Lead II Upward: Towards +60. Downward: Towards -120.
upward and downward QRS from a hexaxial reference: Lead III Upward: Towards +120. Downward: Towards -60.
upward and downward QRS from a hexaxial reference: aVF Upward: Towards +90. Downward: Towards -90.
upward and downward QRS from a hexaxial reference: aVR Upward: towards -150. Downward: Towards +30
upward and downward QRS from a hexaxial reference: aVL Upward: Towards -30. Downward: Towards +150.
What is the normal range for a mean QRS vector on a hexaxial reference? How would the QRS of Lead I and aVF appear? -10 to +110. (The Lower Left quadrant) **Lead 1: upwards. aVF: upwards.
What number range would be seen with LAD (left axis deviation)? How would the QRS of Lead I and aVF appear? 0 to -90. The Upper left quadrant. **Lead I: upwards. aVF: downward
What number range would be seen with RAD (Right axis deviation)? How would the QRS of Lead I and aVF appear? +90 to +180. The Lower Right quadrant. **Lead I: downward. aVF: upward
What number range would be seen with an Extreme RAD or Northwest? How would the QRS of Lead I and aVF appear? -90 to +180. The upper Right quadrant. **Lead I:downward. aVF: downward
What leads should be analyzed analyzed when looking for abnormal cheat "rotations" V3 & V4. **Right rotation: transitoin leads will be V1 and V2. **Left rotation: transition leads will be V5 and V6 **If they move towards right, rightward rotation. **If they move toward the left, leftward rotation
What Effects will Hypertrophy have on the mean vector? Will cause the vector to move TOWARDS the hypertrophy.
What Effects will Infarction have on the mean vector? Will cause the vector to move AWAY from the infarction b/c the tissue is dead.
When would it be ok to see LAD in a patient? OBESITY
Created by: WeeG