IBHRE PREP EXAM WITH CORRECT
VERIFIED/DETAILED ANSWERED QUESTIONS A
COMPLETE BEST SOLUTION COVERS
2024/2025 GRADED A+ FOR SUCCESS
Voltage is? - CORRECT ANSWERS The electromotive force pushing on electrons
If the PM output voltage is 5v and the measured lead resistance is 330 ohms,
then the current that flows out of the pacemaker into the heart is? - CORRECT
ANSWERS 15.15
I=V/R=5V/.33 k ohm
If a unipolar lead wire has an insulation break one would expect the resistance
to? - CORRECT ANSWERS decrease
for a wire fracture the resistance? - CORRECT ANSWERS increases
if the output vlotage of the pacemaker is programmed from 5 volts to 2.5 volts,
the energy delivered to the heart is? - CORRECT ANSWERS quartered
Which of the following affect the longevity of the PM? - CORRECT ANSWERS
output voltage, resistance of lead and amount % pacing
Which Pt's PM will last longer? - CORRECT ANSWERS #1: AMP=5V, L.R.=90,
resistance 500ohms, PW=.5ms, 100%pacing
The strength duration curve is dependent on the? - CORRECT ANSWERS Cell's
membrane capacitance, intracellular and extracellular resistance and threshold
voltage.
A patient on flecainide should? - CORRECT ANSWERS Have their threshold
checked
The acute threshold peaking is due to? - CORRECT ANSWERS Trauma and
inflammation
An advantage of bipolar leads is? - CORRECT ANSWERS They are less
susceptible to EMI
The two parameters that are important for ventricular sensing and should be
measured are? - CORRECT ANSWERS R-wave amplitude and slew rate
If an external PM is set to a sensitivity setting of 5mV and some R-waves go
unsensed, then you should do the following - CORRECT ANSWERS Increase
sensing by lowering sensitivity to 2.5mV.
Typical acceptable R-wave amplitude values for an acute ventricular lead is? -
CORRECT ANSWERS 7-15mV
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