NR 341: critical care exam 1 Questions With Complete
Solutions
● Cardiovascular disease ● Myocardial infarction (MI) ●
Hypoxia ● Acid-base imbalances ● Electrolyte disturbances ●
Kidney failure, liver, or lung disease ● Pericarditis ● Drug or
alcohol use ● Hypovolemia ● Shock
What conditions can cause cardiac dysrhythmias?
Note that every 3 seconds a marker appears on the ECG paper.
Count the number of QRS complexes in 6 seconds and multiply
that number by 10. This is the estimated number of beats per
minute.
** Attached picture shows the "markers" that appear every 3
seconds.
How do you calculate the HR on an ECG strip?
The conduction pathway is the same as that in sinus rhythm, but
the SA node fires irregularly. This often results from changes in
intrathoracic pressure during breathing. The HR increases
slightly during inspiration and decreases slightly during
exhalation. It remains 60 to 100 beats/min. It is common in
healthy adults.
,What is sinus arrythmia?
hypothyroidism, increased intracranial pressure, and inferior
myocardial infarction (MI)
Common disease states associated with sinus bradycardia are....
carotid sinus massage, Valsalva maneuver, hypothermia,
increased intraocular pressure, vagal stimulation, and certain
drugs (e.g., β-blockers, calcium channel blockers)
Sinus bradycardia may be a normal sinus rhythm in aerobically
trained athletes and in some people during sleep. It also occurs
in response to....
A. Sinus bradycardia
B. Sinus tachycardia
What do the following rhythm strips show?
Premature atrial contractions
What does the following rhythm strip show?
A premature atrial contraction (PAC) is a contraction starting
from an ectopic focus in the atrium (i.e., a location other than
, the SA node) sooner than the next expected sinus beat. The
ectopic signal starts in the left or right atrium and travels across
the atria by an abnormal pathway. This creates a distorted P
wave. At the AV node, it may be stopped (nonconducted PAC),
delayed (lengthened PR interval), or conducted normally. If the
signal moves through the AV node, in most cases it is conducted
normally through the ventricles.
What is a premature atrial contraction?
Paroxysmal supraventricular tachycardia (PSVT). Arrows
indicate beginning and ending of PSVT.
What rhythm does the following ECG strip show?
In the normal heart, PSVT is associated with overexertion,
emotional stress, deep inspiration, and stimulants, such as
caffeine and tobacco. PSVT is also associated with rheumatic
heart disease, digitalis toxicity, CAD, and cor pulmonale.
What conditions are associated with Paroxysmal
supraventricular tachycardia (PSVT)?
every impulse is conducted to the ventricles, but the time of AV
conduction is prolonged. After the impulse moves through the
AV node, the ventricles usually respond normally.
First-degree AV block is a type of AV block in which...
Solutions
● Cardiovascular disease ● Myocardial infarction (MI) ●
Hypoxia ● Acid-base imbalances ● Electrolyte disturbances ●
Kidney failure, liver, or lung disease ● Pericarditis ● Drug or
alcohol use ● Hypovolemia ● Shock
What conditions can cause cardiac dysrhythmias?
Note that every 3 seconds a marker appears on the ECG paper.
Count the number of QRS complexes in 6 seconds and multiply
that number by 10. This is the estimated number of beats per
minute.
** Attached picture shows the "markers" that appear every 3
seconds.
How do you calculate the HR on an ECG strip?
The conduction pathway is the same as that in sinus rhythm, but
the SA node fires irregularly. This often results from changes in
intrathoracic pressure during breathing. The HR increases
slightly during inspiration and decreases slightly during
exhalation. It remains 60 to 100 beats/min. It is common in
healthy adults.
,What is sinus arrythmia?
hypothyroidism, increased intracranial pressure, and inferior
myocardial infarction (MI)
Common disease states associated with sinus bradycardia are....
carotid sinus massage, Valsalva maneuver, hypothermia,
increased intraocular pressure, vagal stimulation, and certain
drugs (e.g., β-blockers, calcium channel blockers)
Sinus bradycardia may be a normal sinus rhythm in aerobically
trained athletes and in some people during sleep. It also occurs
in response to....
A. Sinus bradycardia
B. Sinus tachycardia
What do the following rhythm strips show?
Premature atrial contractions
What does the following rhythm strip show?
A premature atrial contraction (PAC) is a contraction starting
from an ectopic focus in the atrium (i.e., a location other than
, the SA node) sooner than the next expected sinus beat. The
ectopic signal starts in the left or right atrium and travels across
the atria by an abnormal pathway. This creates a distorted P
wave. At the AV node, it may be stopped (nonconducted PAC),
delayed (lengthened PR interval), or conducted normally. If the
signal moves through the AV node, in most cases it is conducted
normally through the ventricles.
What is a premature atrial contraction?
Paroxysmal supraventricular tachycardia (PSVT). Arrows
indicate beginning and ending of PSVT.
What rhythm does the following ECG strip show?
In the normal heart, PSVT is associated with overexertion,
emotional stress, deep inspiration, and stimulants, such as
caffeine and tobacco. PSVT is also associated with rheumatic
heart disease, digitalis toxicity, CAD, and cor pulmonale.
What conditions are associated with Paroxysmal
supraventricular tachycardia (PSVT)?
every impulse is conducted to the ventricles, but the time of AV
conduction is prolonged. After the impulse moves through the
AV node, the ventricles usually respond normally.
First-degree AV block is a type of AV block in which...
