Deck 2: The Health Care Delivery System

Question 1

When electrical activity is not detected on the ECG, a straight line is recorded called the "baseline" or "isoelectric line."

Answer 1

True

Question 2

The ECG does not provide information about:

A) conduction disturbances.
B) the presence of ischemic damage.
C) electrical effects of medications and electrolytes.
D) the mechanical (contractile) condition of the myocardium.

Answer 2

the mechanical (contractile) condition of the myocardium.

Question 3

Where is the negative electrode placed in lead II?

A) Left arm
B) Right arm
C) Left leg
D) Right leg

Answer 3

Right arm

Question 4

In an adult, the normal duration of the QRS complex is:

A) 0.12 to 0.20 second.
B) 0.11 second or less.
C) 0.04 to 0.14 second.
D) 0.20 second or less.

Question 5

Select the incorrect statement regarding the PR interval.

A) A normal PR interval measures 0.12 to 0.20 second.
B) The PR interval normally lengthens as the heart rate increases.
C) The PR interval is measured from the point where the P wave leaves the baseline to the beginning of the QRS complex.
D) A normal PR interval indicates the electrical impulse was conducted normally through the heart's conduction system.

Question 6

Where should the positive electrode for lead V₅ be positioned?

A) Right side of sternum, fourth intercostal space
B) Left midaxillary line at same level as V₄
C) Left side of sternum, fourth intercostal space
D) Left anterior axillary line at same level as V₄

Question 7

Lead V₅ views the _____ of the left ventricle.

A) lateral wall
B) anterior wall
C) posterior wall
D) inferior wall

Question 8

Which of the following leads should be used to view the right ventricle?

A) V₃
B) V₇
C) V₄R
D) V₆

Question 9

Lead V₁ views the:

A) anterior wall.
B) septum.
C) inferior wall.
D) posterior wall.

Question 10

The portion of the ECG tracing between the T wave and P wave is called the:

A) PR segment.
B) TP segment.
C) QT interval.
D) PT interval.

Question 11

When leads I and aVF are used to determine electrical axis, left axis deviation is present if the QRS is:

A) positive in lead I and positive in lead aVF.
B) positive in lead I and negative in lead aVF.
C) negative in lead I and negative in lead aVF.
D) negative in lead I and positive in lead aVF.

Question 12

Complete the following chart:
$\begin{array}{lrr} \text { Lead } & \text { Positive } & \text {Negative } & \text {Heart Surface }\\ \text { } & \text { Electrode} & \text { Electrode } & \text {viewed }\\ \text { Lead I} &\underline{\quad\quad} &\underline{\quad\quad} &\underline{\quad\quad}\\ \text { Lead II} &\underline{\quad\quad} &\underline{\quad\quad} &\underline{\quad\quad}\\ \text { Lead III } &\underline{\quad\quad} &\underline{\quad\quad} &\underline{\quad\quad}\\\end{array}$

Question 13

Complete the following chart:

$\begin{array}{lrr} \text { Lead } & \text { Positive } & \text {Heart Surface }\\ \text { } & \text { Electrode} & \text {viewed }\\ \text { aVR} &\underline{\quad\quad} &\underline{\quad\quad} \\ \text { aVL} &\underline{\quad\quad} &\underline{\quad\quad} \\ \text { aVF} &\underline{\quad\quad} &\underline{\quad\quad} \\\end{array}$