Complete the following ECG criteria for first-degree AV block: ...

[SO00]

Complete the following ECG criteria for first-degree AV block:
 
  Rhythm ___________________ ___________________ __
  Rate ___________________ ___________________ __
  P waves ___________________ ___________________ __
  PR interval ___________________ ___________________ __
  QRS duration ___________________ ___________________ __
 
  Fill in the blanks with correct word

Question 2

Is depolarization the same as contraction? Explain your answer.
 
  What will be an ideal response?

[leahchrapun]

Answer to Question 1

Rhythm Regular.
Rate Usually within normal range, but depends on underlying rhythm.
P waves Normal in size and shape; one positive (upright) P wave before each QRS.
PR interval Prolonged (i.e., more than 0.20 seconds) but constant.
QRS duration Usually 0.11 seconds or less unless abnormally conducted.

Answer to Question 2

Depolarization is not the same as contraction. Depolarization (an electrical event) is expected to result in contraction (a mechanical event). It is possible to see organized electrical activity on the cardiac monitor, yet evaluation of the patient reveals no palpable pulse. This clinical situation is called pulseless electrical activity (PEA).