NSG 223 Mod 7 - Cardiac Practice Exam
Questions and Answers with Verified
Solutions | Latest Updated 2026
A patient has been diagnosed with Answer: 3 Explanation: 1. During the
premature ventricular contractions. absolute
The nurse realizes that this refractory period the cell cannot deal with
dysrhythmia can result from a any new
weaker electrical impulses and is completely
than normal stimulus during which resistant to
action potential period? stimuli. 2. In the relative refractory period a
1. Absolute refractory period stronger than normal electrical stimuli is
2. Relative refractory period needed to
3. Supranormal period trigger depolarization. This stimulus could
4. Subnormal period result in
premature ventricular contraction. 3.
During the
supranormal period a weaker than normal
stimulus
can produce depolarization and can result
in
premature ventricular contractions. 4.
Subnormal is
not used to describe a phase or period of
the
action potential.
,A patient's electrocardiogram ST Answer: 1 Explanation: 1. The ST segment
segment tracing is deflected from represents
baseline. The nurse would conduct the completion of ventricular depolarization
assessment for which condition? and
1. Ventricular muscle injury the beginning of ventricular repolarization.
2. Atrial muscle injury The
3. Respiratory acidosis segment should be isoelectric, or
4. Hypocalcemia consistent with
the baseline. There should be no
deflections
present because positive and negative
charges are
balanced. Deflections in the ST segment
usually
indicate ventricular muscle injury. 2. The
ST segment
is not associated with atrial depolarization
or
repolarization. 3. The ST segment is not
associated
with respiratory acidosis. 4. Deflection of
the ST
segment is not associated with calcium
levels.
,The nurse has determined that the Answer: 3 Explanation: 1. The length of
patient has a bundle branch block. the PR
Which condition likely exists? interval is not associated with bundle
1. A PR interval longer than 0.20 branch block.
seconds 2. Presence of a bundle branch block is
2. An elevated ST segment not
3. A QRS segment longer than determined by the position of the ST
0.12 segment. 3.
seconds The QRS complex should be 0.12 seconds
4. A PR interval that lengthens or less in
with length unless there is a delay in the
each beat impulse
reaching the ventricles. A widened QRS
complex
means delayed conduction through the
bundle
branches or a bundle branch block,
abnormal
conduction within the ventricles, or early
activation
of the ventricles through a bypass route. 4.
Lengthening PR interval is related to heart
block,
not bundle branch block
, The nurse interpreting a patient's Answer: 2 Explanation: 1. It is important to
electrocardiogram has just determine if each P wave is followed by a
examined QRS
the P waves. What is the nurse's complex, but this is not the next step of
next rhythm
step? interpretation. 2. The next structure of
1. Determine if each P wave is importance
followed by a QRS complex. in the rhythm is the PR interval. The nurse
2. Measure the PR interval. should
3. Diagnose the rhythm. measure its length. 3. To make an
4. Examine and measure the QRS accurate
complex. diagnosis of rhythm, the nurse should
follow the
standard interpretation sequence. 4. The
nurse
does not examine the QRS complex until
the P
wave and PR interval have been
addressed.
A patient is diagnosed with Answer: 1, 4, 5 Explanation: 1.
hypermagnesemia. The nurse Hypermagnesemia
would can prolong the QT interval. 2. Increased
assess for which changes on the levels of
patient's cardiac rhythm strip? magnesium can result in bradycardia. 3.
Select all that apply. Increased
1. Prolonged QT interval levels of magnesium can produce a
2. Tachycardia widened QRS.
3. Narrow, upright QRS 4. AV block can result from high
4. Atrioventricular (AV) block magnesium levels.
5. Prolonged PR interval 5. Hypermagnesemia can result in
lengthening of
the PR interval.
Questions and Answers with Verified
Solutions | Latest Updated 2026
A patient has been diagnosed with Answer: 3 Explanation: 1. During the
premature ventricular contractions. absolute
The nurse realizes that this refractory period the cell cannot deal with
dysrhythmia can result from a any new
weaker electrical impulses and is completely
than normal stimulus during which resistant to
action potential period? stimuli. 2. In the relative refractory period a
1. Absolute refractory period stronger than normal electrical stimuli is
2. Relative refractory period needed to
3. Supranormal period trigger depolarization. This stimulus could
4. Subnormal period result in
premature ventricular contraction. 3.
During the
supranormal period a weaker than normal
stimulus
can produce depolarization and can result
in
premature ventricular contractions. 4.
Subnormal is
not used to describe a phase or period of
the
action potential.
,A patient's electrocardiogram ST Answer: 1 Explanation: 1. The ST segment
segment tracing is deflected from represents
baseline. The nurse would conduct the completion of ventricular depolarization
assessment for which condition? and
1. Ventricular muscle injury the beginning of ventricular repolarization.
2. Atrial muscle injury The
3. Respiratory acidosis segment should be isoelectric, or
4. Hypocalcemia consistent with
the baseline. There should be no
deflections
present because positive and negative
charges are
balanced. Deflections in the ST segment
usually
indicate ventricular muscle injury. 2. The
ST segment
is not associated with atrial depolarization
or
repolarization. 3. The ST segment is not
associated
with respiratory acidosis. 4. Deflection of
the ST
segment is not associated with calcium
levels.
,The nurse has determined that the Answer: 3 Explanation: 1. The length of
patient has a bundle branch block. the PR
Which condition likely exists? interval is not associated with bundle
1. A PR interval longer than 0.20 branch block.
seconds 2. Presence of a bundle branch block is
2. An elevated ST segment not
3. A QRS segment longer than determined by the position of the ST
0.12 segment. 3.
seconds The QRS complex should be 0.12 seconds
4. A PR interval that lengthens or less in
with length unless there is a delay in the
each beat impulse
reaching the ventricles. A widened QRS
complex
means delayed conduction through the
bundle
branches or a bundle branch block,
abnormal
conduction within the ventricles, or early
activation
of the ventricles through a bypass route. 4.
Lengthening PR interval is related to heart
block,
not bundle branch block
, The nurse interpreting a patient's Answer: 2 Explanation: 1. It is important to
electrocardiogram has just determine if each P wave is followed by a
examined QRS
the P waves. What is the nurse's complex, but this is not the next step of
next rhythm
step? interpretation. 2. The next structure of
1. Determine if each P wave is importance
followed by a QRS complex. in the rhythm is the PR interval. The nurse
2. Measure the PR interval. should
3. Diagnose the rhythm. measure its length. 3. To make an
4. Examine and measure the QRS accurate
complex. diagnosis of rhythm, the nurse should
follow the
standard interpretation sequence. 4. The
nurse
does not examine the QRS complex until
the P
wave and PR interval have been
addressed.
A patient is diagnosed with Answer: 1, 4, 5 Explanation: 1.
hypermagnesemia. The nurse Hypermagnesemia
would can prolong the QT interval. 2. Increased
assess for which changes on the levels of
patient's cardiac rhythm strip? magnesium can result in bradycardia. 3.
Select all that apply. Increased
1. Prolonged QT interval levels of magnesium can produce a
2. Tachycardia widened QRS.
3. Narrow, upright QRS 4. AV block can result from high
4. Atrioventricular (AV) block magnesium levels.
5. Prolonged PR interval 5. Hypermagnesemia can result in
lengthening of
the PR interval.
