NHA CET STUDY GUIDE QUESTIONS AND ANSWERS ALREADY PASSED

The presence of which of the following on an EKG tracing can indicate a previous myocardial infarction (MI)? - CORRECT ANSWER Pathologic Q waves An EKG technician is reviewing EKG tracings of a patient who has ventricular hypertrophy (enlarged ventricle). Which of the following findings should the technician expect? - CORRECT ANSWER Irregularity of P-P interval An EKG technician is measuring the intervals on an EKG tracing. Which of the following is an expected finding of impaired conduction through the AV node? - CORRECT ANSWER Prolonged PR interval Which of the following waves should an EKG tech use to determine the regularity of the ventricular rate? - CORRECT ANSWER R wave Which of the following describes a complete cardiac cycle in a healthy heart? - CORRECT ANSWER P wave, QRS complex, T wave Which of the following is the result of atrial depolarization? - CORRECT ANSWER P wave Which of the following waves should an EKG technician measure to evaluate for atrial depolarization? - CORRECT ANSWER P wave From the tracing shown, which of the following waves is absent? (Illustration shows a QRS complex and T wave but no P wave) - CORRECT ANSWER Which of the following intervals should be used to determine the regularity of ventricular depolarization? - CORRECT ANSWER R-R interval Using the tracing below, measure the PR interval in seconds. (You would count the number of small boxes from the beginning of the P wave to the end of the PR segment and multiply that number by .04 to give you an answer in seconds. For milliseconds, take the answer in seconds and move the decimal 3 spaces to the right. There were 7 small boxes in this example, so 7 X .04=.28 seconds) - CORRECT ANSWER .28 seconds An EKG technician should recognize that the smallest box on the EKG graph paper represents which of the following lengths of time? - CORRECT ANSWER 0.04 seconds An EKG technician is measuring the intervals on an EKG tracing. Which of the following is an expected finding of impaired conduction through the AV node? - CORRECT ANSWER Prolonged PR interval In the tracing shown, which of the following is the duration of the QT interval in seconds? (You would count the # of small boxes from the beginning of the Q wave to the end of the T wave and multiply that number X .04. To convert to milliseconds, multiply the answer in seconds by 1000, or move decimal three places to the right. In the example there were 13 small boxes, so 13 X .04= 0.52 seconds - CORRECT ANSWER 0.52 seconds An EKG technician should recognize that a PR interval that spans 4 small boxes on the EKG paper has which of the following durations? - CORRECT ANSWER 0.16 seconds Which of the following sections of the EKG tracing should the EKG tech use to measure the QRS complex? - CORRECT ANSWER Beginning of the Q wave to the end of the S wave Measure the QT interval in the tracing below in milliseconds. (You would count the number of small boxes from the beginning of the Q wave to the end of the T wave and multiply that number X .04, then convert to milliseconds. There were 18 small boxes X .04=.72 seconds. They are asking for milliseconds, so .72 seconds X 1000= 720mS) - CORRECT ANSWER 720 mS Calculating Heart Rate-There are four methods you need to know: 6 second rule, 1500 method, 300