IBHRE CCDS Prep Questions and
Answers 2026 Guide
1. Which of the following lead insulation materials are The correct answer
known for reducing fibroblast ingrowth and suscepti- is:ePTFE and 80A
bility to MIO and ESC, respectively? polyurethane
Select one:
a. Silicone and 55D polyurethane This is incorrect.
b. Silicone and ePTFE
c. 0A polyurethane and silicone/polyurethane hybrid
d.ePTFE and 80A polyurethane
2. The ventriculoatrial conduction time of a pacemaker The correct answer is:
patient with a typical endless-loop-tachycardia may be None of the above
calculated by which equation?
Select one:
a. Rate - programmed A-pace AV delay
b. Rate - programmed A-sense AV delay This is incor-
rect.
c. Lower rate limit - upper rate limit
d. None of the above
3. For treatment of arrhythmias, most drugs work by: The correct answer is: Al-
tering conductivity or re-
Select one: fractoriness
a. Increasing the export of Ca into the cell
b. Altering conductivity or refractoriness
c. Maintaining a consistent cardiac action potential
This is incorrect.
d. Soothing irritable foci
4. The electrical circuit that converts a signal with both The correct answer is: Rec-
positive and negative components into a signal with tifier
only one component?
, IBHRE CCDS Prep Questions and
Answers 2026 Guide
Select one:
a. Resistor
b. Rectifier
c. Diode
d. Capacitor
5. Which of the above 3 month stimulation threshold The correct answer is: D
graphs would be most characteristic of steroid eluting
tined atrial lead?
Select one:
a. A
b. B This is incorrect.
c. C
d. D
6. Which of the following conditions has been shown to The correct answer is: Hy-
cause: an increase in stimulation threshold, a wide perkalemia
QRS, latency, or undersensing?
Select one:
a. Hypokalemia
b. Hyperkalemia
c. Hypercalcemia
d. Hypocalcemia
7. Which of the following RV leads would be least prone The correct answer is: An
to anodal stimulation in an extended bipolar configu- integrated ICD lead with
ration with a unipolar LV lead when BiV pacing? an anode 450 mm2 and
cathode 2 mm2
, Select one:
a. A brady lead with an anode 5 mm2 and cathode 1.2
mm2
b. A brady lead with an anode 4.2 mm2 and cathode
of 5 mm2
c. An integrated ICD lead with an anode 450 mm2 and
cathode 2 mm2 This is correct!
d. A dedicated bipolar ICD lead with an anode 6 mm2
and cathode 2.5 mm2
8. If one has the physiologic substrate for reentry, which The correct answer is: Uni-
of the following would be necessary to initiate the directional block of one
reentry tachycardia? pathway
Select one:
a. Heterogeneity of refractory
b. Differential conduction of the pathways This is in-
correct.
c. Two pathways connected distally and proximally
d. Unidirectional block of one pathway
9. The term S2 refers to the: The correct answer is: First
premature stimulus
Select one:
a. Drive cycle length
b. First premature stimulus
c. Second premature stimulus This is incorrect.
d. Second incremental burst
10. Faster and longer range telemetry, new therapies, The correct answer is:
and physiologic sensors in pacemaker devices require Lithium silver vanadium
higher peak power outside the range of Li/I2 batter- oxide & lithium carbon
ies. Which of the following battery chemistries is now monofluoride
, incorporated into some pacemakers?
Select one:
a. Lithium silver vanadium oxide & lithium carbon
monofluoride
b. Lithium ion batteries
c. Nickel cadmium batteries
d. Lithium thionyl chloride batteries
11. Fluoroquinolones, a new generation of broad spec- The correct answer is: Pro-
trum oral antibiotics, is known for which of the follow- longing the QT
ing cardiac effects?
Select one:
a. Suppressing sinus node function
b. Slowing conduction through the AV node
c. Positive inotropic effects
d. Prolonging the QT
12. The horizontal asymptote of a strength duration curve The correct answer is:
defines which of the following: Rheobase
Select one:
a. Charge
b. Pulse width threshold
c. Rheobase
d. Chronaxie
13. Which of the following pacemaker components is The correct answer is:
most susceptible to cumulative damage from high CMOS
doses of radiation?
Answers 2026 Guide
1. Which of the following lead insulation materials are The correct answer
known for reducing fibroblast ingrowth and suscepti- is:ePTFE and 80A
bility to MIO and ESC, respectively? polyurethane
Select one:
a. Silicone and 55D polyurethane This is incorrect.
b. Silicone and ePTFE
c. 0A polyurethane and silicone/polyurethane hybrid
d.ePTFE and 80A polyurethane
2. The ventriculoatrial conduction time of a pacemaker The correct answer is:
patient with a typical endless-loop-tachycardia may be None of the above
calculated by which equation?
Select one:
a. Rate - programmed A-pace AV delay
b. Rate - programmed A-sense AV delay This is incor-
rect.
c. Lower rate limit - upper rate limit
d. None of the above
3. For treatment of arrhythmias, most drugs work by: The correct answer is: Al-
tering conductivity or re-
Select one: fractoriness
a. Increasing the export of Ca into the cell
b. Altering conductivity or refractoriness
c. Maintaining a consistent cardiac action potential
This is incorrect.
d. Soothing irritable foci
4. The electrical circuit that converts a signal with both The correct answer is: Rec-
positive and negative components into a signal with tifier
only one component?
, IBHRE CCDS Prep Questions and
Answers 2026 Guide
Select one:
a. Resistor
b. Rectifier
c. Diode
d. Capacitor
5. Which of the above 3 month stimulation threshold The correct answer is: D
graphs would be most characteristic of steroid eluting
tined atrial lead?
Select one:
a. A
b. B This is incorrect.
c. C
d. D
6. Which of the following conditions has been shown to The correct answer is: Hy-
cause: an increase in stimulation threshold, a wide perkalemia
QRS, latency, or undersensing?
Select one:
a. Hypokalemia
b. Hyperkalemia
c. Hypercalcemia
d. Hypocalcemia
7. Which of the following RV leads would be least prone The correct answer is: An
to anodal stimulation in an extended bipolar configu- integrated ICD lead with
ration with a unipolar LV lead when BiV pacing? an anode 450 mm2 and
cathode 2 mm2
, Select one:
a. A brady lead with an anode 5 mm2 and cathode 1.2
mm2
b. A brady lead with an anode 4.2 mm2 and cathode
of 5 mm2
c. An integrated ICD lead with an anode 450 mm2 and
cathode 2 mm2 This is correct!
d. A dedicated bipolar ICD lead with an anode 6 mm2
and cathode 2.5 mm2
8. If one has the physiologic substrate for reentry, which The correct answer is: Uni-
of the following would be necessary to initiate the directional block of one
reentry tachycardia? pathway
Select one:
a. Heterogeneity of refractory
b. Differential conduction of the pathways This is in-
correct.
c. Two pathways connected distally and proximally
d. Unidirectional block of one pathway
9. The term S2 refers to the: The correct answer is: First
premature stimulus
Select one:
a. Drive cycle length
b. First premature stimulus
c. Second premature stimulus This is incorrect.
d. Second incremental burst
10. Faster and longer range telemetry, new therapies, The correct answer is:
and physiologic sensors in pacemaker devices require Lithium silver vanadium
higher peak power outside the range of Li/I2 batter- oxide & lithium carbon
ies. Which of the following battery chemistries is now monofluoride
, incorporated into some pacemakers?
Select one:
a. Lithium silver vanadium oxide & lithium carbon
monofluoride
b. Lithium ion batteries
c. Nickel cadmium batteries
d. Lithium thionyl chloride batteries
11. Fluoroquinolones, a new generation of broad spec- The correct answer is: Pro-
trum oral antibiotics, is known for which of the follow- longing the QT
ing cardiac effects?
Select one:
a. Suppressing sinus node function
b. Slowing conduction through the AV node
c. Positive inotropic effects
d. Prolonging the QT
12. The horizontal asymptote of a strength duration curve The correct answer is:
defines which of the following: Rheobase
Select one:
a. Charge
b. Pulse width threshold
c. Rheobase
d. Chronaxie
13. Which of the following pacemaker components is The correct answer is:
most susceptible to cumulative damage from high CMOS
doses of radiation?
