|
| 1 | You are assessing an ECG tracing you just printed out. To determine the duration of the PR intervals you should measure from where the ___ wave begins to where the ___ wave begins. |
 | A) | P, S |
| B) | P, Q |
| C) | R, T |
| D) | Q, T |
|
| 2 | You correctly measure the PR interval. Which of the following findings is considered normal? |
| A) | PR intervals are 0.24 seconds in duration |
| B) | PR intervals seem to have a changing duration |
| C) | PR intervals are 0.10 seconds in duration |
| D) | PR intervals are 0.16 seconds in duration |
|
| 3 | The duration of the normal PR interval extends across ___ to ___ small squares of the ECG graph paper. |
| A) | 1, 5 |
| B) | 2, 10 |
| C) | 3, 5 |
| D) | 4, 8 |
|
| 4 | A normal PR interval may be present with some dysrhythmias that arise from the ____, provided the ectopic site is located in the upper ____. |
| A) | atria, atrial wall |
| B) | AV junction, atrial wall |
| C) | ventricle, junctional tissue |
| D) | AV node, junctional tissue |
|
| 5 | Premature beats that arise from the atria or internodal pathways before the SA node has a chance to fire can produce P'R intervals that: |
| A) | are always shorter than normal |
| B) | differ from the underlying rhythm |
| C) | are always longer than normal |
| D) | vary in duration |
|
| 6 | If a premature atrial complex (PAC) arises from a site in the lower-right atrium or in the upper part of the AV junction, the P'R interval should be: |
| A) | within normal limits |
| B) | greater than 0.12 seconds in duration |
| C) | less than 0.12 seconds in duration |
| D) | constant in duration |
|
| 7 | You identify the presence of atrial tachycardia on the ECG monitor. Which of the following is true regarding the P'R intervals characteristically seen in atrial tachycardia? |
| A) | it can be hard or even impossible to accurately measure the P'R intervals |
| B) | the P'R intervals will be longer than normal in duration |
| C) | the duration of the P'R intervals will vary |
| D) | the P'R intervals will be within normal limits |
|
| 8 | Preexcitation characteristically has: |
| A) | P'R intervals that seem to get progressively longer until a QRS complex is dropped, this cycle repeats itself over and over again |
| B) | P'R intervals that are within normal limits |
| C) | abnormal slurring at its onset and short P'R intervals |
| D) | P'R intervals that are longer than normal in duration |
|
| 9 | When dysrhythmias originating from the AV junction have P' waves that precede the QRS complex: |
| A) | it can be hard or even impossible to accurately measure the P'R intervals |
| B) | the P'R intervals will be longer than normal in duration |
| C) | the duration of the P'R intervals will vary |
| D) | the P'R intervals will be shorter than normal |
|
| 10 | When dysrhythmias originating from the AV junction have P' waves that are buried in the QRS complex the: |
| A) | P'R intervals are absent |
| B) | P'R intervals will be longer than normal in duration |
| C) | duration of the P'R intervals will vary |
| D) | P'R intervals will be shorter than normal |
|
| 11 | PR intervals are absent with all of the following dysrhythmias EXCEPT: |
| A) | atrial flutter |
| B) | atrial fibrillation |
| C) | sinus dysrhythmia |
| D) | idioventricular rhythm |
|
| 12 | The most common cause of longer than normal PR intervals is: |
| A) | 3rd-degree AV heart block |
| B) | junctional escape rhythm |
| C) | wandering atrial pacemaker |
| D) | 1st-degree AV heart block |
|
| 13 | You are assessing an ECG rhythm where the PR intervals are 0.32 seconds in duration and constant. Each P wave is followed by a QRS complex. This indicates the presence of: |
| A) | 2nd-degree AV heart block |
| B) | 1st-degree AV heart block |
| C) | wandering atrial pacemaker |
| D) | junctional escape rhythm |
|
| 14 | The PR intervals vary or change in: |
| A) | wandering atrial pacemaker |
| B) | Type I, 2nd-degree AV heart block |
| C) | sinus tachycardia |
| D) | a & b |
|
| 15 | The PR intervals are progressively longer until a QRS complex is dropped and then the cycle starts over with: |
| A) | Type I, 2nd-degree AV heart block |
| B) | Wandering atrial pacemaker |
| C) | Sinus dysrhythmia |
| D) | Type II, 2nd-degree AV heart block |
|
| 16 | In 3rd-degree AV heart block, the PR intervals are: |
| A) | longer in duration than normal |
| B) | shorter in duration than normal |
| C) | not measurable |
| D) | variable in duration |
|
| 17 | The PR interval consists of P wave and a flat line. |
| A) | True |
| B) | False |
|
| 18 | A normal PR interval indicates the impulse originated low in the atria and traveled through the AV node in a regular and unobstructed course. |
| A) | True |
| B) | False |
|
| 19 | The PR interval is usually normal with normal sinus rhythm, sinus bradycardia, sinus tachycardia, sinus dysrhythmia, wandering atrial pacemaker and junctional escape rhythm. |
| A) | True |
| B) | False |
|
| 20 | PR intervals are considered abnormal if they are shorter than 0.12 seconds, longer than 0.20 seconds, absent, or vary in duration. |
| A) | True |
| B) | False |
|
| 21 | It is easy to determine the duration of the P'R intervals in premature atrial complexes (PACs) where the P' wave is buried in the T wave of the preceding beat. |
| A) | True |
| B) | False |
|
| 22 | Preexcitation is the premature depolarization of the ventricles that occurs when an impulse arises from a site above the ventricles and travels through the AV node to the ventricles more quickly than normal. |
| A) | True |
| B) | False |
|
| 23 | When the P' wave follows the QRS complex in junctional dysrhythmias the P'R interval is referred to as the RP' interval. |
| A) | True |
| B) | False |
|
| 24 | 1st-degree AV heart block can occur with any rhythm originating in the SA node, such as sinus rhythm, bradycardia, or tachycardia. |
| A) | True |
| B) | False |
|
| 25 | In Type II, 2nd-degree AV heart block, the PR intervals associated with the P waves conducted through to the ventricles are constant. |
| A) | True |
| B) | False |