Understanding the Electrocardiogram (ECG)

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What is the record of potential fluctuations during the cardiac cycle called?

Electromyogram

Electroencephalogram

Echocardiogram

Electrocardiogram (correct)

What type of electrode is connected to an indifferent electrode at zero potential for unipolar recording?

Exciting electrode

Active electrode (correct)

Ground electrode

Passive electrode

How can Einthoven’s triangle be approximated using electrodes?

By placing electrodes on both legs and head

By placing electrodes on both arms and right leg

By placing electrodes on both arms and left leg (correct)

By placing electrodes on both arms and both legs

How are the three standard limb leads used in electrocardiography placed?

On both arms and left leg Signup and view all the answers

What does a positive deflection in an ECG signify in terms of depolarization movement?

Depolarization moving towards an active electrode Signup and view all the answers

What does a negative deflection in an ECG indicate?

Depolarization moving away from an active electrode Signup and view all the answers

What is the primary reason for the configurations of the waves in each lead of an electrocardiogram?

The sequence in which the parts of the heart are depolarized Signup and view all the answers

Where are the atria located in the chest?

Posteriorly Signup and view all the answers

Which part of the heart is anterolateral to the left ventricle?

The right ventricle Signup and view all the answers

What does the aVR lead 'look at' in the heart?

The right ventricle Signup and view all the answers

What is the initial portion of the QRS complex in leads V1 and V2?

A small upward deflection Signup and view all the answers

What is the reason for the small upward deflection at the start of the QRS complex in leads V1 and V2?

Ventricular depolarization first moves across the midportion of the septum from left to right toward the exploring electrode Signup and view all the answers

What is the significance of a large R wave in the left ventricular leads (V4-V6)?

Septal and left ventricular depolarization Signup and view all the answers

Which ECG lead shows an initial small Q wave followed by a moderate S wave?

Lead V5 Signup and view all the answers

What is the main purpose of bipolar limb leads in electrocardiography?

Indicate the magnitude and direction of electromotive force in the heart Signup and view all the answers

Which ECG interval represents ventricular depolarization and atrial repolarization?

QRS duration Signup and view all the answers

How does the position of the normal heart affect the electrocardiographic complexes in different leads?

It influences the configuration of electrocardiographic complexes in various leads Signup and view all the answers

Which event corresponds to the ST interval on an ECG?

Ventricular repolarization Signup and view all the answers