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MCQ 26: Pacemaker (36)

Q. A patient has been provided with a single chamber pacemaker recently for complete heart block. The pacing mode is set as VVIR. R in VVIR stands for?
A. Rate responsive
B. Rate controlled
C. Rate sensitive
D. Rate inhibition
Answer: A. Rate responsive
Explanation:

 1st letter: Chamber paced
2nd letter: Chamber sensed
3rd letter: Action of the pacemaker after sensing a beat
4th letter: Rate responsiveness i.e. demand ventricular pacing is present with response to exercise

 VVIR means: Ventricle is paced, ventricle is sensed, pacing is inhibited if beat is sensed and rate responsiveness is present in pacemaker i.e. rate of pacing is increased if a physiological need is there e.g. during exercise.
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