« previous next »

Author Question: The PR interval of a first-degree AV block _____. a. is constant and less than 0.12 seconds in ... (Read 181 times)

scienceeasy

  • Hero Member
  • *****
  • Posts: 565
on: Jun 25, 2018
The PR interval of a first-degree AV block _____.
 
  a. is constant and less than 0.12 seconds in duration
  b. is constant and more than 0.20 seconds in duration
  c. is generally progressive until a P wave appears without a QRS complex
  d. gradually decreases in duration until a P wave appears without a QRS complex

Question 2

The PR interval is considered prolonged if it is more than _____ seconds in duration.
 
  a. 0.06
  b. 0.12
  c. 0.18
  d. 0.20


mrphibs

  • Sr. Member
  • ****
  • Posts: 307
Reply #1 on: Jun 25, 2018
Answer to Question 1

B
A first-degree AV block is present when there is a 1:1 relationship between P waves and QRS complexes and the PR interval is prolonged (i.e., more than 0.20 seconds) and constant.

Answer to Question 2

D
A PR interval is considered short if it is less than 0.12 seconds and long if it is more than 0.20 seconds.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

Did you know?

Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.

Did you know?

According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

Did you know?

Everyone has one nostril that is larger than the other.

The use of antispasmodics, which block release of Ach or calcium, can result in reduced pain as well ... The use of antispasmodics, which block release of Ach or calcium, can result in reduced pain as well ...
A cutaway of a small block Chevrolet V-8 showing the passage from the cylinder head through the ... A cutaway of a small block Chevrolet V-8 showing the passage from the cylinder head through the ...
Converting Degrees, Minutes, Seconds to Degrees Converting Degrees, Minutes, Seconds to Degrees
Given the values of sin θ, determine the values of θ over the interval [0, 2pi] Given the values of sin θ, determine the values of θ over the interval [0, 2pi]
If you walk 5.0 m horizontally forward at a constant velocity carrying a 10 N object, the ... If you walk 5.0 m horizontally forward at a constant velocity carrying a 10 N object, the ...
Write equilibrium constant expressions for the following reactions in terms of concentration: Write equilibrium constant expressions for the following reactions in terms of concentration:
Video: Metaphase I Animation

For a complete list of videos, visit our video library