ECG PRIMER / Intro to EKG lecture
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| show | fibrillation. Due to cardiac cells all firing at different times.
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| show | The AV node ~ 1.5 seconds. This prevents atria and ventricles from contracting simultaniously, allowing time for ventricular filling.
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| show | The P wave represents atrial depolarization. It should be upright and slightly rounded.
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| What is the Ta wave. | show 🗑
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| What is represented by the QRS wave. | show 🗑
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| What is represented by the T wave? How should t look? | show 🗑
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| What is the U wave. How should it look, | show 🗑
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| show | Intervals contain waves, while segments are the lines between the waves (ie ST segment)
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| What does the PR interval represent? | show 🗑
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| It represents the time interval between the depolarization of the atria and the spread of depolariztion up to and including the AV node. | show 🗑
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| What does the PR segment represent? | show 🗑
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| Represents the period of time between the P wave and the QRS complex. | show 🗑
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| show | The distance between the end of the QRS complex (j point) and the beginnng of the T wave. This is a sensitive indicator of myocardial ischemia or injury (MI)
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| show | ST segment
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| show | The time from the beginning of the QRS complex to the end of the T wave. It represents both ventricular depolarization AND repolarization.
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| It represents both ventricular depolarization AND repolarization. | show 🗑
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| What is ventricular activation time? | show 🗑
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| show | Ventricular activation time. (beginning of QRS complex to peak of R wave... should be called a QR interval)
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| show | Q wave: always negative. R wave: always positive. S wave: always negative.
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| Normal value: P wave = | show 🗑
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| Normal value: PR interval = | show 🗑
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| Normal value: QRS interval = | show 🗑
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| Normal value: QT interval = | show 🗑
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| Normal value: QTc interval = | show 🗑
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| show | .04 seconds
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| show | .2 seconds
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| 1 small box vertically represents what voltage? | show 🗑
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| show | **300/ # of big squares** Count each large box from one QRS to the next as 300, 150, 100, 75, 60, 50, 42. So 5 large boxes = 60 BPM
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| show | 25mm/sec (300 big squares per minute)
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| Each small box is how large? | show 🗑
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| show | at rest: < or = 1 mm depression/elevation. At exercise: < or = 2 mm depression/elevation.
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| show | PR>.20 seconds (1 big box)
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| show | Mobitz I = Progressive increase in PR interval followed by a P wave w/o a QRS
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| show | Mobitz II: Constant PR interval then P wave without a QRS
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| Describe the EKG appearance of a third degree AV block | show 🗑
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| show | Pause without a Q wave.
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| show | RAD = > +120 degrees
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| What is the criteria for a left axis deviation? | show 🗑
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| What is the normal range for axis? | show 🗑
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| show | If AvF is negative it's a LAD (<0 degrees). If 1 is negative then it's a RAD (>90). Net positive QRS = Positive lead
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| show | Inferior MI, LVH, LAHB
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| A Right axis deviation (RAD) may represent what pathology? | show 🗑
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| show | a prominent U wave. Although this is not diagnostic of hypokalemia, it may explain a ECG finding in a pt that is hypokalemic.
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