IBHRE practice exam #1 questions with correct answers
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Course
IBHRE
Institution
IBHRE
Wenkebach window - correct answer Max tracing interval(in ms) - TARP(in ms)
2:1 Block Point - correct answer 60,000/TARP
Basic unit of capacitance - correct answer Farad
Function of pacemaker circuitry that allows the pacemaker output pulse to be dissipated quickly maximizing both output a...
IBHRE practice exam #1 questions with correct
answers
Wenkebach window - correct answer Max tracing interval(in ms) - TARP(in ms)
2:1 Block Point - correct answer 60,000/TARP
Basic unit of capacitance - correct answer Farad
Function of pacemaker circuitry that allows the pacemaker output pulse to be dissipated quickly maximizing both output and sensing capabilities - correct answer Charge dump
Av sequentially paced pts with frequent ventricular ectopy should have what programmed to decrease chance of competition - correct answer Short blanking period
Low threshold electrode materials include - correct answer Iridium oxide, platinized platinum, titanium nitrate
Formula for strength duration curve resulting in parabolic shape - correct answer I x V x T
The most commonly used battery chemistry in ICDs - correct answer Lithium silver vanadium oxide
What is the purpose of a capacitor in an electrical circuit - correct answer Store electrical charge
All of the following have been used as ERI magnet responses except:
- abrupt increase in rate
- abrupt decrease in rate
- gradual increase in rate
- gradual decrease in rate - correct answer Abrupt decrease in rate Which of the following has not been used as an indicator of battery depletion?
- pulse width stretching
- mode change
- programmed amplitude reversion
- telemetered battery impedance - correct answer Programmed amplitude reversion
The electrical circuit that coverts a signal with both positive and negative components into a signal with only one component - correct answer Rectifier
Threshold 1.0@0.4. Output 2.0@0.8. Output = how many times the threshold - correct answer 8x
Lead insulation failure characteristics commonly include - correct answer Extracardiac stimulation
What is the voltage measurement of a pacing system with a resistance of 800 ohms, current of 4.5 mA and pacing rate of 60 ppm? - correct answer 3.6 V
Which of the following conditions has been shown to cause: increase in stimulation threshold, wide QRS, latency, or undersensing? - correct answer Hyperkalemia
What is the estimated battery service life of a pacemaker with a 1.6 amp hour battery and a 16 micro amp current drain? - correct answer 11.4 yrs
A 75 y/o male with CHB and old anterior MI has a DDDC pacemaker with the following settings: LRL 60, URL 100, AVD 200ms, Atrial refractory 350ms, vref 300ms, pacemaker Wenckebach interval is: - correct answer 50 ms
75 y/o male with CHB and old anterior MI has a DDDC pacemaker with the following settings: LRL 60, URL 100, AVD 200, ARP 350ms, vref 300. What will the apparent max AVD be prior to the 2:1 block point be? - correct answer 250ms
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