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Electrocardiography Fundamentals

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Questions and Answers

What is required to record electrical potentials generated by the current?

Electrodes placed on the skin (correct)

A single cardiac muscle fiber

A microelectrode inserted into a ventricular muscle fiber

A high-speed recording meter

What is the ECG composed of?

Only repolarization waves

Both depolarization and repolarization waves (correct)

Only depolarization waves

Neither depolarization nor repolarization waves

What is indicated by the color red in Figure 11-2?

Complete depolarization

Complete polarization

Depolarization (correct)

Repolarization

What is the stage of the muscle fiber in Figure 11-2A?

Halfway depolarization (C) Signup and view all the answers

When is no potential recorded in the ECG?

When the ventricular muscle is completely polarized or completely depolarized (A) Signup and view all the answers

What is shown in Figure 11-3?

A monophasic action potential recorded from a microelectrode inserted into a ventricular muscle fiber (A) Signup and view all the answers

What is the standard representation of 10 small line divisions upward or downward in an ECG?

1 millivolt (A) Signup and view all the answers

How much time does each 25 millimeters in the horizontal direction represent in an ECG?

1 second (C) Signup and view all the answers

What is the typical voltage range of the QRS complex in an ECG?

1.0 to 1.5 millivolts (D) Signup and view all the answers

How is the heart rate determined from an ECG?

By dividing the time interval between two successive heartbeats (C) Signup and view all the answers

What is the typical voltage range of the T wave in an ECG?

0.2 to 0.3 millivolts (D) Signup and view all the answers

What is the typical speed at which an ECG is run?

25 millimeters per second (C) Signup and view all the answers