# This Is A Quiz On The ECG Unit

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CardioECI517
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This is a Quiz on the ECG unit. You must pass it with an 80% or better to pass the module.

• 1.

### The rate of ventricular contraction is noted by: (Refer to the section on determining heart rate from the ECG if you do not remember.)

• A.

The p to p wave interval

• B.

The r to r wave interval

• C.

The s to s wave interval

• D.

The t to t wave interval

B. The r to r wave interval
Explanation
The correct answer is the r to r wave interval. This interval represents the time between two consecutive R waves on an ECG, which corresponds to the contraction of the ventricles. By measuring the duration of the r to r wave interval, we can determine the rate of ventricular contraction, also known as the heart rate.

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• 2.

### The P wave is a sign of:  (Refer to the section on cardiac contribution to ECG in the physiology of cardiac conduction if you don't remember.)

• A.

Ventricular depolarization

• B.

Ventricular repolarization

• C.

Atrial depolarization

• D.

No depolarization in the heart

C. Atrial depolarization
Explanation
The correct answer is atrial depolarization. The P wave in an ECG represents the depolarization of the atria, which is the electrical activation of the atrial muscle cells. This is the initial electrical signal that causes the atria to contract and pump blood into the ventricles.

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• 3.

### The placement for the chest lead, V6, is located:  (Refer to the section on chest /precordial leads to find the placement.)

• A.

On the right side of the sternum in the 4th intercostal space

• B.

On the left side of the chest in the fifth intercostal space in the mid-clavicular line

• C.

On the left side of the chest in the left anterior axillary line in the fifth intercostal space

• D.

On the left side of the chest in the left mid-axillary line in the 5th intercostal space

D. On the left side of the chest in the left mid-axillary line in the 5th intercostal space
Explanation
The correct answer is on the left side of the chest in the left mid-axillary line in the 5th intercostal space. This is the correct placement for the chest lead V6, as indicated by the question.

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• 4.

### The normal configuration of the QRS complex in lead II is: (Refer to the section on ECG output.)

• A.

Negative

• B.

Positive

• C.

BipHasic

B. Positive
Explanation
The normal configuration of the QRS complex in lead II is positive. This means that the QRS complex has a predominantly upward deflection in lead II of an electrocardiogram (ECG). A positive QRS complex indicates that the electrical depolarization of the ventricles is primarily moving towards the positive electrode in lead II. This is a normal finding and suggests that the electrical conduction system of the heart is functioning properly.

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• 5.

### Left axis deviation may indicate: (Refer to the section on ECG axis.)

• A.

Hyperkalemia

• B.

A normal finding in children

• C.

An atrial septal defect

• D.

A pulmonary embolus

A. Hyperkalemia
Explanation
Left axis deviation on an ECG may indicate hyperkalemia. Hyperkalemia refers to high levels of potassium in the blood, which can affect the electrical conduction in the heart. This can lead to changes in the ECG, including a shift in the heart's electrical axis to the left. Therefore, the presence of left axis deviation on an ECG can be a clue to the possibility of hyperkalemia.

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• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Sep 11, 2011
Quiz Created by
CardioECI517

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