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