Generally speaking, what is the normal duration of a QT interval? ...

[809779]

Generally speaking, what is the normal duration of a QT interval?
 
  What will be an ideal response?

Question 2

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

[stillxalice]

Answer to Question 1

The duration of the QT interval varies according to age, gender, and particularly heart rate. If the QT interval is less than half the RR interval, it is probably normal.

Answer to Question 2

Rhythm Ventricular irregular; atrial regular (i.e., Ps plot through on time).
Rate Atrial rate is greater than the ventricular rate; ventricular rate is often slow.
P waves Normal in size and shape; some P waves are not followed by a QRS complex (i.e., more Ps than QRSs).
PR interval Within normal limits or prolonged but constant for the conducted beats; the PR intervals before and after a blocked P wave are constant.
QRS duration Within normal limits if the block occurs above or within the bundle of His; greater than 0.11 seconds if the block occurs below the bundle of His; complexes are periodically absent after P waves.