In second-degree and third-degree AV blocks, _____. a. P waves ...

[natalie2426]

In second-degree and third-degree AV blocks, _____.
 
  a. P waves occur regularly
  b. every other P wave is dropped
  c. P waves are periodically dropped
  d. there are more QRS complexes than P waves

Question 2

Explain the meaning of the letters in aVR, aVL, and aVF.
 
  What will be an ideal response?

[Sassygurl126]

Answer to Question 1

A
In second-degree and third-degree AV blocks, there are more P waves than QRS complexes and the P waves occur regularly.

Answer to Question 2

The a in aVR, aVL, and aVF refers to augmented. The V refers to voltage. The R refers to right arm, the L to left arm, and the F to foot (usually of the left leg). The position of the positive electrode corresponds to the last letter in each of these leads. The positive pole in aVR is located on the right arm, aVL has a positive pole at the left arm, and aVF has a positive electrode positioned on the left leg.

[natalie2426]

Excellent

[Missbam101]

TYSM