Author Question: What does the QRS complex represent? a. Atrial depolarization b. Ventricular contraction c. ... (Read 81 times)

APUS57

  • Hero Member
  • *****
  • Posts: 571
What does the QRS complex represent?
 
  a. Atrial depolarization
  b. Ventricular contraction
  c. Ventricular repolarization
  d. Ventricular depolarization

Question 2

How would you differentiate a junctional escape rhythm at 40 beats/min from a ventricular escape rhythm at the same rate?
 
  a. It is impossible to differentiate a junctional escape rhythm from a ventricular escape rhythm.
  b. The junctional escape rhythm will have a narrow QRS complex; the ventricular escape rhythm will have a wide QRS complex.
  c. The rate (40 beats/min) would indicate a junctional escape rhythm, not a ventricular escape rhythm.
  d. The junctional escape rhythm will have a wide QRS complex; the ventricular escape rhythm will have a narrow QRS complex.



Christopher

  • Sr. Member
  • ****
  • Posts: 316
Answer to Question 1

D
When the ventricles are stimulated, a QRS complex is recorded on the ECG. Thus, the QRS complex represents ventricular depolarization.

Answer to Question 2

B
Although junctional and ventricular rhythms are ectopic pacemaker sites, their rhythms can generally be differentiated by the width of their QRS complexes. The junctional escape rhythm will have a narrow QRS complex; the ventricular escape rhythm will have a wide QRS complex.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Did you know?

Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Did you know?

The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

For a complete list of videos, visit our video library