EKG Flashcards
What causes V-Fib
Hypoxia causes etopic foci
What happens if a impulse begins during relative refectory
Torsade de pointes
Normal QT-interval
0.4-.44
How does a NSTEMI
Horizontal or downslope
What causes a STEMI
Myocardial infarction
What causes a NSTEMI
Myocardial ischemia
How are ST depressions observed
Patients with CAD doing a stress test
Can’t deliver enough blood
(Exertional angina)
Difference between up-sloping vs down-sloping NSTEMI
Up: ischemia
Down: exercise induced
Describe Non- ischemic ST elevation
Common in all populations
Upwards slope (concave) ST-segment
Describe ST-elevation caused by ischemia
Upward convex or straight ST segment (can be horizontal)
What creates a negative deflection
Moving away from the electrode
What is a vector
Difference in electrical potential formed between two electrodes
Has magnitude and direction
Other name for a vector
Electrical Axis
What’s the degree of the electrical axis
59 degrees
What plane does the vector point
Frontal
What causes right axis deviation
Hypertrophy of the RV
Infarction of the LV
RBBB
PE
Where do you put electrodes with a three 3 lead
RA and LA: Under the clavicle at midclavicular line
Between rib 2 and three
LL: under pec rib 8-12
What plane are you looking at with three planes
Frontal plane
What leads are most EKGs taken from
2nd lead
Other name for three leads and how it works
Limb electrodes
Conduction from a negative electrode to a positive electrode
How tall is a ST elevation minimal
1-2 small boxes
How depressed does a ST interval have to be to be classified
.5 or greater
Greater than 1-2 covey worse prognosis
Which ST abnormality is supply ischemia
Elevation
Complete occlusion
