A 72-year-old woman had a pacemaker inserted 4 years ago for symptomatic bradycardia because of AV nodal disease. She is clinically feeling well and her ECG shows normal sinus rhythm at a rate of 68/min but no pacemaker spikes. Her pacemaker only functions when the ventricular rate falls below a preset interval.
Which of the following best describes her pacemaker function?
(A) asynchronous
(B) atrial synchronous
(C) ventricular synchronous
(D) ventricular inhibited
(E) atrial sequential
Answer: (D) ventricular inhibited
Discussion: The ventricular inhibited (VVI) pacemaker functions when the heart rate falls below a preset interval. If a QRS is detected, the pacemaker is inhibited. If a QRS is not sensed, the pacing stimulus is not inhibited and the ventricle is stimulated
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