IBHRE Prep Exam Questions With
100% Correct Answers.
Voltage is? - Answer 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? - Answer 15.15
I=V/R=5V/.33 k ohm
If a unipolar lead wire has an insulation break one would expect the resistance to? -
Answer decrease
for a wire fracture the resistance? - Answer increases
if the output vlotage of the pacemaker is programmed from 5 volts to 2.5 volts, the
energy delivered to the heart is? - Answer quartered
Which of the following affect the longevity of the PM? - Answer output voltage,
resistance of lead and amount % pacing
Which Pt's PM will last longer? - Answer #1: AMP=5V, L.R.=90, resistance 500ohms,
PW=.5ms, 100%pacing
#2: AMP=5V, L.R.=60, resistance 500ohms, PW=.5ms, 100%pacing
#3: AMP=2.5V, L.R.=60, resistance 330ohms, PW=.5ms, 100% pacing
(#4: AMP=2.5v, L.R.=60, resistance 500ohms, PW=.5ms, 50%pacing)
The strength duration curve is dependent on the? - Answer Cell's membrane
capacitance, intracellular and extracellular resistance and threshold voltage.
A patient on flecainide should? - Answer Have their threshold checked
The acute threshold peaking is due to? - Answer Trauma and inflammation
An advantage of bipolar leads is? - Answer They are less susceptible to EMI
The two parameters that are important for ventricular sensing and should be
measured are? - Answer 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 - Answer Increase sensing by lowering
sensitivity to 2.5mV.
Typical acceptable R-wave amplitude values for an acute ventricular lead is? -
Answer 7-15mV
Typical acceptable P wave amplitude values for an acute atrial lead is? - Answer
greater than 2mV
The slew rate is? - Answer Change in voltage divided by time or the slope of the
EGM
100% Correct Answers.
Voltage is? - Answer 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? - Answer 15.15
I=V/R=5V/.33 k ohm
If a unipolar lead wire has an insulation break one would expect the resistance to? -
Answer decrease
for a wire fracture the resistance? - Answer increases
if the output vlotage of the pacemaker is programmed from 5 volts to 2.5 volts, the
energy delivered to the heart is? - Answer quartered
Which of the following affect the longevity of the PM? - Answer output voltage,
resistance of lead and amount % pacing
Which Pt's PM will last longer? - Answer #1: AMP=5V, L.R.=90, resistance 500ohms,
PW=.5ms, 100%pacing
#2: AMP=5V, L.R.=60, resistance 500ohms, PW=.5ms, 100%pacing
#3: AMP=2.5V, L.R.=60, resistance 330ohms, PW=.5ms, 100% pacing
(#4: AMP=2.5v, L.R.=60, resistance 500ohms, PW=.5ms, 50%pacing)
The strength duration curve is dependent on the? - Answer Cell's membrane
capacitance, intracellular and extracellular resistance and threshold voltage.
A patient on flecainide should? - Answer Have their threshold checked
The acute threshold peaking is due to? - Answer Trauma and inflammation
An advantage of bipolar leads is? - Answer They are less susceptible to EMI
The two parameters that are important for ventricular sensing and should be
measured are? - Answer 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 - Answer Increase sensing by lowering
sensitivity to 2.5mV.
Typical acceptable R-wave amplitude values for an acute ventricular lead is? -
Answer 7-15mV
Typical acceptable P wave amplitude values for an acute atrial lead is? - Answer
greater than 2mV
The slew rate is? - Answer Change in voltage divided by time or the slope of the
EGM
