refractory periods

Question 1

Which answer(s) is(are) true regarding this tracing?
Your answerChoice
Selected

A. the paced atrial AV delay is usually programmed longer than the sensed atrial AV delay
 

B. the sensed atrial AV delay is usually programmed longer than the paced atrial AV delay

C. failure of atrial sensing

D. ineffective ventricular pacing

Selected

E. minimum rate programmed at 60 beats/minute

Question 2

Which answer(s) is(are) true regarding the ventricular refractory periods?
Your answerChoice
Selected

A. there is a post-atrial sensing ventricular blanking

B. there is a post-atrial pacing ventricular blanking

Selected

C. there is a post-atrial sensing ventricular safety window

Selected

D. there is a post-atrial pacing ventricular safety window

E. ventricular sensing during the safety window causes ventricular pacing 100 ms after the atrial stimulus

Question 3

Which answer(s) is(are) true regarding this tracing?
Your answerChoice
Selected

A. this is a PMT 

B. this is a sinus tachycardia

C. this is an atrial sensing failure (low-amplitude signals)

D. this is a 2:1 flutter

E. the pacemaker has switched to DDI as fallback mode

Question 4

Which answer(s) is(are) true regarding this tracing?
Your answerChoice

A. switching occurs as a result of atrial bigeminism

Selected

B. switching occurs as a result of crosstalk 

C. switching occurs as a result of an atrial flutter

D. switching occurs as a result of an AF

E. switching occurs as a result of noise oversensing

Question 5

Associer à un tracé: 
Which answer(s) is(are) true regarding this tracing?
Your answerChoice

A. the maximum synchronous rate is programmed at 120 beats/minute

Selected

B. the PMT begins following the occurrence of a doublet of premature ventricular contractions

Selected

C. VIP programming promotes the occurrence of retrograde conduction

Selected

D. to confirm the presence of the PMT, the device modifies the AV delay for one cycle

E. to terminate the PMT, the device extends the PVARP for one cycle

Question 6

Which answer(s) is(are) true regarding this tracing?
Your answerChoice

A. this is most likely a VT episode

B. this is most likely a PMT

Selected

C. this is most likely a sinus tachycardia episode

D. this is most likely an AF episode

E. this is most likely a 2:1 flutter episode

Question 7

Which answer(s) is(are) true regarding this tracing?
Your answerChoice

A. this is an atrial tachycardia episode

B. this is a PMT

C. there is an increase in atrial threshold

Selected

D. in the second portion of the tracing, atrial activation is retrograde (AR)

Selected

E. in the second portion of the tracing, atrial pacing is ineffective since occurring in the atrial refractory period