Dysrhythmias Questions With Correct AnswersTo determine whether there is a delay in impulse conduction through the ventricles,
the nurse will measure the duration of the patient's
a. P wave. c. PR interval.
b. Q wave.
...
Dysrhythmias Questions With Correct AnswersTo determine whether there is a delay in impulse conduction through the ventricles,
the nurse will measure the duration of the patient's
a. P wave. c. PR interval.
b. Q wave. d. QRS complex. - ANS: D
The QRS complex represents ventricular depolarization. The P wave represents the
depolarization of the atria. The PR interval represents depolarization of the atria,
atrioventricular node, bundle of His, bundle branches, and the Purkinje fibers. The Q
wave is the first negative deflection following the P wave and should be narrow and
short.
The nurse needs to quickly estimate the heart rate for a patient with a regular heart
rhythm. Which method will be best to use?
a. Count the number of large squares in the R-R interval and divide by 300.
b. Print a 1-minute electrocardiogram (ECG) strip and count the number of QRS
complexes.
c. Use the 3-second markers to count the number of QRS complexes in 6 seconds
and multiply by 10.
d. Calculate the number of small squares between one QRS complex and the next
and divide into 1500. - ANS: C
This is the quickest way to determine the ventricular rate for a patient with a regular
rhythm. All the other methods are accurate, but take longer.
A patient has a junctional escape rhythm on the monitor. The nurse will expect the
patient to have a heart rate of _____ beats/min.
a. 15 to 20 c. 40 to 60
b. 20 to 40 d. 60 to 100 - ANS: C
If the sinoatrial (SA) node fails to discharge, the atrioventricular (AV) node will
automatically discharge at the normal rate of 40 to 60 beats/minute. The slower rates
are typical of the bundle of His and Purkinje system and may be seen with failure of
both the SA and AV node to discharge. The normal SA node rate is 60 to 100
beats/min.
The nurse obtains a rhythm strip on a patient who has had a myocardial infarction
and makes the following analysis: no visible P waves, PR interval not measurable,
ventricular rate of 162, R-R interval regular, and QRS complex wide and distorted,
and QRS duration of 0.18 second. The nurse interprets the patient's cardiac rhythm
as
a. atrial flutter. c. ventricular fibrillation.
b. sinus tachycardia. d. ventricular tachycardia. - ANS: D
The absence of P waves, wide QRS, rate greater than 150 beats/min, and the
regularity of the rhythm indicate ventricular tachycardia. Atrial flutter is usually
regular, has a narrow QRS configuration, and has flutter waves present representing
atrial activity. Sinus tachycardia has P waves. Ventricular fibrillation is irregular and
does not have a consistent QRS duration.
The nurse notes that a patient's heart monitor shows that every other beat is earlier
than expected, has no visible P wave, and has a QRS complex that is wide and
bizarre in shape. How will the nurse document the rhythm?
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