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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| show | Ventricular REpolarization. It is normally upright and rounded
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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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| show | PR interval
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| show | Represents the period of time between the P wave and the QRS complex. (should be called PQ segment!)
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| Represents the period of time between the P wave and the QRS complex. | show 🗑
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| What does the ST segment represent? | show 🗑
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| This is a sensitive indicator of myocardial ischemia or injury (MI) | show 🗑
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| What is represented by the QT interval? | show 🗑
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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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| show | <.12 seconds **<3 small boxes**
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| Normal value: QT interval = | show 🗑
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| show | .33-.47 seconds ** QT/SQRT(RR interval ** QTc is QT corrected for HR
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| 1 small box = (what time interval?) | show 🗑
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| 1 large box = (what time interval?) | show 🗑
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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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| What is the standard paper speed of an EKG | show 🗑
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| show | 1 MM
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| Normal value: ST segment = | show 🗑
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| Describe the EKG appearance of a first degree AV block? | show 🗑
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| Describe the EKG appearance of a second degree AV block: Mobitz I | show 🗑
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| Describe the EKG appearance of a second degree AV block: Mobitz II | show 🗑
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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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| show | LAD = < -30 degrees
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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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| A left axis deviation (LAD) may represent what pathology? | show 🗑
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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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