Advanced EKG Flashcards
Left axis deviation is a main cardiac vector in what range?
-30 to -90
Possible causes of a L axis deviation
- LVH
2. Inferior wall MI
Right axis deviation is a main cardiac vector in what approximate ranges?
90/100/110 to 180
Possible causes of R axis deviation
- RVH
- Young age
- Dextrocardia
Extreme R axis deviation is a main cardiac vector within what range?
-90 to 180
For the QRS to be upright in lead II, the MEA must be between
-29 and 149 degrees
For the QRS to be inverted in lead II, the MEA must be between
-31 and 151 degrees
For the QRS to be equiphasic in lead II, the MEA must be
-30 or 150 degrees
If a patient has a normal QRS axis, there will always be a (positive/negative) R deflection in lead aVR
Negative
If a patient has a normal QRS axis, there will always be a (positive/negative) deflection in lead II
Positive
If a patient has a normal QRS axis, lead I is usually (upright/inverted)
upright
If a patient has a LAD, there will be a (positive/negative) deflection in lead I
Positive
If a patient has a LAD, there will be a (positive/negative) deflection in leads II, III, aVF
Negative
What separates a LAD from a normal QRS axis ECG?
Negative R deflection in lead II
If a patient has a RAD, there will be a (positive/negative) deflection in leads III and aVF
Positive
If a patient has a RAD, there will be a (positive/negative) deflection in leads I and aVL
Negative
Right precordial leads
V1 and V2
Left precordial leads
V3-V6
Why does SSS occur?
Malfunctioning SA node
How is MAT treated?
Antiarrhythmics (magnesium, verapamil/diltiazem, metoprolol)
ECG description for RBBB
- 2 R waves in V1/V2
2. Broad, slurred S waves in V5/V6
The time from the beginning of the QRS complex to the peak of the QRS complex
Intrinsicoid deflection
ECG description for LBBB
- RsR in leads I, aVL, V5/V6
- Deep S wave in V1/V2
- ST depression and/or T wave inversion in leads I, aVL, V5/V6
Which aberrancy is more common?
RBBB
ECG description for RAE
- Tall P waves >2.5 mm in I, II, III
2. Tall P waves >1.5 in V1/V2
ECG description for LAE
- Wide P wave in limb leads >120 msec
2. Negative or biphasic P wave in V1, V2 (>1mm in depth or width)
ECG description for RVH
- Tall R waves in V1
- Deep S waves in V5-V6
- R (in V1) + S (in V5 or V6) is >10.5 mm
ECG description for LVH
- Deep S waves in V1
- Tall R waves in V5/V6
- S (V1 or V2) + R (V5 or V6) is >35mm
R coronary artery supplies
- SA node
- AV node
- Inferior wall
- Posterior wall
- Inferior 1/3 of ventricular septum
L main coronary artery supplies
LAD 1. Anterior L ventricle 2. Ventricular septum Circumflex 1. Posterior left ventricle 2. Lateral left ventricle
Leads and blood supply for inferior wall
II, III, aVF
R coronary artery
Leads and blood supply for lateral wall
I, aVL, V5, V6
Circumflex artery
Leads and blood supply for septum
V1, V2
LADA
Leads and blood supply for anterior wall
V3, V4
LADA
