Question | Answer |
During ________ _______ there is a refractory period where the myocardial cells can not be stimulated | Relaxation phase |
Cells can NOT be stimulated AT ALL | Absolute Refractory |
Cells can be stimulated, BUT w/o the desired effect | relative refractory |
Records electrical activity of the heart | ECG or EKG |
The fact that the myocardial cells can depolarize and repolarize | Action potential |
the pathway of electrical activity | Vector |
electricity always runs from a ______ pole to a ________ pole | negative, positive |
Normal depolarization of the heart is from the | upper right to the lower left |
Name parts of the ECG machine | 1.Galvanometer 2.electrodes 3.Lead wires 4.Stilus 5.paper |
changes electrical activity into mechanical motion | Galvanometer |
have a electrolyte gel for better conduction of electricity | Electrodes |
connect electrodes to ECG machine | Lead wires |
Writing arm and uses heat not ink | Stilus |
is heat sensitive | paper |
the boxes on the ECG paper horizontal = | time |
normal paper speed is | 25mm/second |
Each small square speed = | 0.04 seconds |
each large square speed = | 0.20 seconds |
the boxes on ECG paper vertical measure | voltage |
each small square measures voltage = | .1mV |
each large square measure voltage = | .5mV |
which box is outlined darker | large box |
Normal Standardization (voltage) | 10mm |
this line represents balance in electrical changes (polarized) | Base line |
base line AKA | Isoelectric line |
any deflection off the baseline | Wave |
Wave can be positive if ______ and negative if_______ | upward and downward |
How many waves in one normal heart beat | 5 |
what are the 5 wave letters | p,q,r,s,t |
P wave = | atrial depolarization |
Q wave = | BOH |
R wave = | R&L bundle braches |
S wave = | Purkinje fibers |
The Q, R, S complex wave = | ventricular depolarization |
T wave = | Ventricular repolarization |
group of related waves | complex |
Time or line between 2 waves = | segment |
A wave combined with a segment = | Interval |
PRI = | Total atrial activity |
STI = | Repolarization/Refractory |
QTI = | Total ventricular Activity (both ventricular depolarization and Repolarization) |
U wave | Raley seen, pt. recovering from CHF or low serum K+ levels |
Represents the AV node holding the impulse | P-R Segment |
Very important in determining myocardial Ischemia and or infarction, Hypocalcemia, | S-T segment |
for heart rate calculation you need how many seconds or how many large boxes | 6 seconds or 30 large boxes |
Count the "_" wave in a 6 second strip and ___ by ___. (It is the least accurate) | R, multiple by 10 |
Count the ______ boxes between __ "R" waves and ____ into 300 | large, 2 and divide |
Count the ____ boxes between 2 "R" waves and divide into _____. (most accurate) | small boxes, 1500 |