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Ekg
chapter 2; The normal Electrocardiogram
| 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 |
Created by:
bpstears
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