1|Page
IBHRE CCDS EXAM AND PRACTICE EXAM NEWEST
2025 TEST BANK| COMPLETE 550 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+| IBHRE CCDS FINAL EXAM
PREP 2025 (BRAND NEW!!)
Which of the following conditions has been shown to cause: an increase
in stimulation threshold, a wide QRS, latency, or undersensing?
a. Hypokalemia
b. Hyperkalemia
c. Hypercalcemia
d. Hypocalcemia - The correct answer is: Hyperkalemia
Which of the following RV leads would be least prone to anodal
stimulation in an extended bipolar configuration with a unipolar LV lead
when BiV pacing?
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 - The correct answer is: An integrated ICD lead with an anode 450
mm2 and cathode 2 mm2
If one has the physiologic substrate for reentry, which of the following
would be necessary to initiate the reentry tachycardia?
pg. 1
,2|Page
a. Heterogeneity of refractory
b. Differential conduction of the pathways This is incorrect.
c. Two pathways connected distally and proximally
d. Unidirectional block of one pathway - The correct answer is:
Unidirectional block of one pathway
Faster and longer range telemetry, new therapies, and physiologic
sensors in pacemaker devices require higher peak power outside the
range of Li/I2 batteries. Which of the following battery chemistries is
now incorporated into some pacemakers?
a. Lithium silver vanadium oxide & lithium carbon monofluoride
b. Lithium ion batteries
c. Nickel cadmium batteries
d. Lithium thionyl chloride batteries - The correct answer is: Lithium
silver vanadium oxide & lithium carbon monofluoride
Fluoroquinolones, a new generation of broad spectrum oral antibiotics,
is known for which of the following cardiac effects?
a. Suppressing sinus node function
b. Slowing conduction through the AV node
c. Positive inotropic effects
d. Prolonging the QT - The correct answer is: Prolonging the QT
The horizontal asymptote of a strength duration curve defines which of
the following:
pg. 2
,3|Page
a. Charge
b. Pulse width threshold
c. Rheobase
d. Chronaxie - The correct answer is: Rheobase
Which of the following pacemaker components is most susceptible to
cumulative damage from high doses of radiation?
a. Accelerometer
b. Transistors
c. Zener diode
d. CMOS - The correct answer is: CMOS
Which of the following pacing modalities has been shown to reduce P-
wave widths and has also shown beneficial effects in patients with
interatrial conduction delays and atrial tachyarrhythmias?
a. Atrial overdrive pacing
b. Bachmann's bundle pacing
c. Right atrial appendage pacing
d. Right lateral wall pacing - The correct answer is: Bachmann's bundle
pacing
In order to have a pacing system automatically assess capture and
stimulation thresholds, the essential electrode characteristic would be:
a. A smooth electrode surface area
b. Minimal electrode diameter size
pg. 3
, 4|Page
c. Minimal electrode surface area
d. Minimal electrode after-potential characteristics - The correct answer
is: Minimal electrode after-potential characteristics
An electrode is placed over conducting tissue. What does the ECG look
like when conduction is directly under the electrode?
a. First positive deflection
b. First negative deflection
c. No waveform deflection
d. The peak of the waveform - The correct answer is: No waveform
deflection
Which of the following is most likely to trigger the EOL in an ICD?
a. Capacitors charging
b. A high percentage of bradycardia pacing
c. An interrogation
d. ATP pacing - The correct answer is: Capacitors charging
It has been well described that a critically timed pulse delivered into a
VT circuit and possibly within the first few seconds of a VF episode
could trigger a wave front block that could terminate the tachycardia.
This area of tissue out in front of the fibrillating wave front is known as
the:
a. Excitable gap
b. Collision zone
pg. 4
IBHRE CCDS EXAM AND PRACTICE EXAM NEWEST
2025 TEST BANK| COMPLETE 550 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+| IBHRE CCDS FINAL EXAM
PREP 2025 (BRAND NEW!!)
Which of the following conditions has been shown to cause: an increase
in stimulation threshold, a wide QRS, latency, or undersensing?
a. Hypokalemia
b. Hyperkalemia
c. Hypercalcemia
d. Hypocalcemia - The correct answer is: Hyperkalemia
Which of the following RV leads would be least prone to anodal
stimulation in an extended bipolar configuration with a unipolar LV lead
when BiV pacing?
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 - The correct answer is: An integrated ICD lead with an anode 450
mm2 and cathode 2 mm2
If one has the physiologic substrate for reentry, which of the following
would be necessary to initiate the reentry tachycardia?
pg. 1
,2|Page
a. Heterogeneity of refractory
b. Differential conduction of the pathways This is incorrect.
c. Two pathways connected distally and proximally
d. Unidirectional block of one pathway - The correct answer is:
Unidirectional block of one pathway
Faster and longer range telemetry, new therapies, and physiologic
sensors in pacemaker devices require higher peak power outside the
range of Li/I2 batteries. Which of the following battery chemistries is
now incorporated into some pacemakers?
a. Lithium silver vanadium oxide & lithium carbon monofluoride
b. Lithium ion batteries
c. Nickel cadmium batteries
d. Lithium thionyl chloride batteries - The correct answer is: Lithium
silver vanadium oxide & lithium carbon monofluoride
Fluoroquinolones, a new generation of broad spectrum oral antibiotics,
is known for which of the following cardiac effects?
a. Suppressing sinus node function
b. Slowing conduction through the AV node
c. Positive inotropic effects
d. Prolonging the QT - The correct answer is: Prolonging the QT
The horizontal asymptote of a strength duration curve defines which of
the following:
pg. 2
,3|Page
a. Charge
b. Pulse width threshold
c. Rheobase
d. Chronaxie - The correct answer is: Rheobase
Which of the following pacemaker components is most susceptible to
cumulative damage from high doses of radiation?
a. Accelerometer
b. Transistors
c. Zener diode
d. CMOS - The correct answer is: CMOS
Which of the following pacing modalities has been shown to reduce P-
wave widths and has also shown beneficial effects in patients with
interatrial conduction delays and atrial tachyarrhythmias?
a. Atrial overdrive pacing
b. Bachmann's bundle pacing
c. Right atrial appendage pacing
d. Right lateral wall pacing - The correct answer is: Bachmann's bundle
pacing
In order to have a pacing system automatically assess capture and
stimulation thresholds, the essential electrode characteristic would be:
a. A smooth electrode surface area
b. Minimal electrode diameter size
pg. 3
, 4|Page
c. Minimal electrode surface area
d. Minimal electrode after-potential characteristics - The correct answer
is: Minimal electrode after-potential characteristics
An electrode is placed over conducting tissue. What does the ECG look
like when conduction is directly under the electrode?
a. First positive deflection
b. First negative deflection
c. No waveform deflection
d. The peak of the waveform - The correct answer is: No waveform
deflection
Which of the following is most likely to trigger the EOL in an ICD?
a. Capacitors charging
b. A high percentage of bradycardia pacing
c. An interrogation
d. ATP pacing - The correct answer is: Capacitors charging
It has been well described that a critically timed pulse delivered into a
VT circuit and possibly within the first few seconds of a VF episode
could trigger a wave front block that could terminate the tachycardia.
This area of tissue out in front of the fibrillating wave front is known as
the:
a. Excitable gap
b. Collision zone
pg. 4
