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| 1 | |
AMY has a normal ECG tracing. What does the QRS complex represent? |
| | A) | Depolarization of the atria. |
| | B) | Depolarization of the ventricles. |
| | C) | Repolarization of the ventricles. |
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| 2 | |
Which wave in BRIAN's ECG is not normal? |
| | A) | The P-wave. |
| | B) | The QRS complex. |
| | C) | The T-wave. |
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| 3 | |
Look carefully at BRIAN's QRS wave. How does it differ from Amy's QRS wave? |
| | A) | The QRS complex has a smaller amplitude. |
| | B) | The QRS complex is quicker. |
| | C) | The QRS complex has two peaks. |
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| 4 | |
How does an action potential travel from BRIAN's AV node to the two ventricles? |
| | A) | Through the AV bundle and Purkinje fibers. |
| | B) | Through nerves. |
| | C) | From fiber to fiber, via gap junctions. |
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| 5 | |
How could a double R-wave be produced in BRIAN'S ECG? |
| | A) | The SA node produces two action potentials, one very soon after the other. |
| | B) | The AV node produces two action potentials, one very soon after the other. |
| | C) | The two branches of the AV bundle have slightly different conduction velocities. |
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| 6 | |
Scroll through CHRIS' ECG tracing. How frequently do the abnormal cycles take place? |
| | A) | Every cycle. |
| | B) | There is one abnormal then one normal ECG. |
| | C) | There is one abnormal then two normal ECGs. |
| | D) | There is one abnormal then three normal ECGs. |
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| 7 | |
Look at CHRIS' abnormal ECG tracing. Which wave is not present? |
| | A) | The P-wave. |
| | B) | The QRS complex. |
| | C) | The T-wave. |
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| 8 | |
If no P-wave is present in CHRIS' ECG, the atria are not contracting. Speculate on the source of the rhythm for the ventricles in the abnormal ECG tracing. |
| | A) | The sinoatrial (SA) node. |
| | B) | The AV node, the AV bundle, or the Purkinje fibers. |
| | C) | The blood passing through the heart stretches, and stimulates, the ventricles to contract. |
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| 9 | |
Which waves can you see clearly in DEB's ECG tracing that are at intervals similar to those seen with Amy? |
| | A) | The QRS complex and the T-wave. |
| | B) | The P-wave and the QRS complex. |
| | C) | The P-wave and the T-wave. |
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| 10 | |
Notice that the ‘baseline' of DEB's ECG is not flat; it is wavy. If the QRS wave indicates that the ventricles are contracting normally, what creates the wavy line? |
| | A) | Multiple P-waves, indicating fibrillation of the atria. |
| | B) | Multiple P-waves, indicating fibrillation of the ventricles. |
| | C) | Multiple T-waves, indicating fibrillation of the atria. |
| | D) | Multiple T-waves, indicating fibrillation of the ventricles. |
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