1|Page
IBHRE CCDS EXAMINATION COMPLETE VERIFIED
QUESTIONS AND DETAILED SOLUTIONS LATEST
UPDATE THIS YEAR JUST RELEASED
if the output voltage 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)
,2|Page
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.
, 3|Page
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
Typical lead resistance range measured in ohms is? -
Answer-300-2000 ohms
At the time of implant we want a threshold? - Answer-at
.5ms to be less than 1 volt for ventricle
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
IBHRE CCDS EXAMINATION COMPLETE VERIFIED
QUESTIONS AND DETAILED SOLUTIONS LATEST
UPDATE THIS YEAR JUST RELEASED
if the output voltage 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)
,2|Page
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.
, 3|Page
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
Typical lead resistance range measured in ohms is? -
Answer-300-2000 ohms
At the time of implant we want a threshold? - Answer-at
.5ms to be less than 1 volt for ventricle
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
