Perfusion: Pre-Post Quiz, Basic EKG

How do cardiac cells differ from skeletal muscle cells?

• Contain actin and myosin.
• Possess automaticity and conductivity.
• Calcium must be present for muscle contraction.
• Do not require oxygen to survive.

A cardiac rhythm strip represents the electrical impulse that travels through the heart.

• True
• False

The heart's electrical impulse travels through the heart from the SA node through the atria to the AV node and Bundle of His continuing down the left and right bundle branches ending at the purkinje fibers.

• True
• False

Where is the SA node located?

• Left Atrium.
• Right Atrium.
• Septal area between atria.
• Junction between left atria and ventricle.

The EKG is composed of waves, complexes, segments, and intervals. What does the QRS complex represent?

• Early atrial repolarization.
• Electrical impulse starting in the SA node and spreading through the atria.
• Ventricular depolarization.
• Ventricular resting state.

What is the most accurate way to determine the heart rate from a 6 second EKG rhythm strip?

• Count the number of R-R intervals and multiply by 10.
• Count the number of small boxes within the R-R interval and divide 1500 by that number.
• Count the number of P-P intervals and multiply by 10.
• Count the number of QRS complexes and divide 1500 by that number.

What is isoelectric?

• A period where no electrical activity is detected in the heart.
• Total time for ventricular depolarization and repolarization.
• The pattern of all electrical activity in the heart.
• The waveforms that reflect the function of the heart's conduction system.

Which sinus node dysrhythmia is characterized by a ventricular and atrial rate of 60-100 beats per minute in an adult?

• Sinus bradycardia.
• Normal sinus rhythm.
• Sinus arrythmia.
• Sinus tachycardia.

Which strategy should the nurse implement to reduce the risk potential for adverse cardiac outcomes in the acute care setting?

• Send the UAP to check on  the client whose cardiac alarm is sounding.
• Follow-up when notified of a rhythm strip change.
• Teach the family member how to silence the alarm and report client changes as they occur.
• Cardiovert the client as soon as possible when a rhythm change occurs.

The nurse administers a positive chronotropic medication to a cardiac client. What will the nurse assess to determine that the medication exerts its intended effect?

• Force of the myocardial contraction.
• Rate of the impulse.
• Positive deflection of waveforms.
• U-wave on rhythm strip.