Chapter 3

Question 0

How many lead wires are used to obtain a 12- lead ECG tracing?

Answer 0

The 10 lead wires produce 12 different lead circuits consisting of one or more wires from the electrodes to the electrocardiograph.

Question 1

What will you need to know to prepare yourself for recording your first ECG?

Answer 1

Always check and double check the lead wires before you begin the tracing.

Question 2

Name three augmented leads.

Answer 2

AVR aVL aVF

Question 3

A multichannel ECG monitors all 12 leads but usually records how many leads at one time?

Answer 3

Records three leads at once and switches automatically, recording each of the four sets of three leads.

Question 4

What are the three basic functions of an ECG?

Answer 4

Input, signal processing and output display

Question 5

What are some reasons that you may change the speed of the ECG tracing?

Answer 5

In some cases you may want to change the speed to 50mm/sec which is twice as fast. You would do this if the patient had an unusually rapid heart rate so that the complexes are farther apart.

Question 6

Name the controls of the ECG machine.

Answer 6

Speed, gain, and artifact filter.

Question 7

Which type of electrode is used when monitoring a patient who will be having serial ECGs done?

Answer 7

For hospitalized patients, longer lasting silver electrodes are available. These electrodes are used for patients who require multiple and frequent ECGs ( series ECGs).

Question 8

When the paper speed is 25 mm/sec there are how many small boxes per minute?

Answer 8

1500