A junctional escape rhythm occurs because of _____. a. severe ...

[Charlie]

A junctional escape rhythm occurs because of _____.
 
  a. severe chronic obstructive pulmonary disease
  b. multiple irritable sites firing within the AV junction
  c. slowing of the rate of the heart's primary pacemaker
  d. intrathoracic pressure changes associated with the normal respiratory cycle

Question 2

When is the term intraventricular conduction delay used?
 
  What will be an ideal response?

[anyusername12131]

Answer to Question 1

C
The atrioventricular (AV) junction may assume responsibility for pacing the heart if (1) the sinoatrial (SA) node fails to discharge (such as sinus arrest), (2) an impulse from the SA node is generated but blocked as it exits the SA node (such as SA block), (3) the rate of discharge of the SA node is slower than that of the AV junction (such as a sinus bradycardia or the slower phase of a sinus arrhythmia), and (4) an impulse from the SA node is generated and is conducted through the atria, but is not conducted to the ventricles (such as an AV block).

Answer to Question 2

A QRS measuring 0.10 to 0.12 seconds is called an incomplete right or left bundle branch block (BBB). A QRS measuring more than 0.12 seconds is called a complete right or left bundle branch block. If the QRS is wide but there is no BBB pattern, the term wide QRS or intraventricular conduction delay is used to describe the QRS.