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IBHRE Certified Cardiac Device Specialist (CCDS)
Certification Exam Study Set, International Board of
Heart Rhythm Examiners||Verified Exam!!||, 2026/2027-
Question Examination with Detailed
Rationales||Newest Exam!!!
What creates a higher current density? - Answer-Smaller
pacing cathode
Anode must be atleast _____ times _______ than cathode
- Answer-3x Larger
ohms law - Answer-V=IR
Most common electrolyte abnormality to cause LOC? -
Answer-Hyperkalemia
Effects of Hyperkalemia - Answer-Increase in threshold,
wide paced complex, latency, peaked T wave
Effects of Hypokalemia - Answer-Irratble foci, R on T,
Torsades
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Equation for current drain - Answer-Time = Battery
capacity / current drain
Time = AmpHour/amperes = Hours
Micro units - Answer-10^-6
BOL
ERI
EOS - Answer-Beginning of Life
Elective Replacement Indicator
End of Service
Cardiac cell charge and electrolyte membrane potential at
rest - Answer-Charge: ~(-90mV) inside of cell
Membrane: Na+ outside;
Cardiac action potentials - Answer-0 - depolarization;
Rapid Na+ influx
1 - early rapid depolarization; Na+ influx STOPS,
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2 - Plateau phase; Ca+ enters
3 - Rapid depolarization; K+ outflux and Ca+ channels
close
4 - alert
Preferred Peak to Peak for P and R waves - Answer-P
waves: >2mV
R waves: >5mV
Preferred slew rate for P and R waves - Answer-P waves:
> .5 V/s
R waves: > .75V/s
Co- Axial VS Co-radial conductor types - Answer-Co -
Axial: One conductor coil inside the other
Co - radial: Two coils overlayed around the radius of lead
S1
S2 - Answer-S1: Drive train
S2: First premature impulse
, 4|Page
What is Wedensky Effect? When is its effect the greatest?
- Answer-Threshold going from capture to LOC is lower
than going in the opposite direction; more prevalent at
SHORT pulse widths
What is Heart Rate Turbulence? What can
presence/absence predict? - Answer-Short term
fluctuation in sinus cycle length over ~15 beats following
PVC (healthy heart increases rate)
Absence of this can predict mortality
Study that found pts with <30% EF with abnormal
Turbulence Slope and Turbulence Onset had 40% 2yr
mortality - Answer-EMIAT
When does threshold begin to rise in tined leads? -
Answer-2-3 days
Flouroquinolones is known for what cardiac effect? -
Answer-Prolonging QT
IBHRE Certified Cardiac Device Specialist (CCDS)
Certification Exam Study Set, International Board of
Heart Rhythm Examiners||Verified Exam!!||, 2026/2027-
Question Examination with Detailed
Rationales||Newest Exam!!!
What creates a higher current density? - Answer-Smaller
pacing cathode
Anode must be atleast _____ times _______ than cathode
- Answer-3x Larger
ohms law - Answer-V=IR
Most common electrolyte abnormality to cause LOC? -
Answer-Hyperkalemia
Effects of Hyperkalemia - Answer-Increase in threshold,
wide paced complex, latency, peaked T wave
Effects of Hypokalemia - Answer-Irratble foci, R on T,
Torsades
,2|Page
Equation for current drain - Answer-Time = Battery
capacity / current drain
Time = AmpHour/amperes = Hours
Micro units - Answer-10^-6
BOL
ERI
EOS - Answer-Beginning of Life
Elective Replacement Indicator
End of Service
Cardiac cell charge and electrolyte membrane potential at
rest - Answer-Charge: ~(-90mV) inside of cell
Membrane: Na+ outside;
Cardiac action potentials - Answer-0 - depolarization;
Rapid Na+ influx
1 - early rapid depolarization; Na+ influx STOPS,
,3|Page
2 - Plateau phase; Ca+ enters
3 - Rapid depolarization; K+ outflux and Ca+ channels
close
4 - alert
Preferred Peak to Peak for P and R waves - Answer-P
waves: >2mV
R waves: >5mV
Preferred slew rate for P and R waves - Answer-P waves:
> .5 V/s
R waves: > .75V/s
Co- Axial VS Co-radial conductor types - Answer-Co -
Axial: One conductor coil inside the other
Co - radial: Two coils overlayed around the radius of lead
S1
S2 - Answer-S1: Drive train
S2: First premature impulse
, 4|Page
What is Wedensky Effect? When is its effect the greatest?
- Answer-Threshold going from capture to LOC is lower
than going in the opposite direction; more prevalent at
SHORT pulse widths
What is Heart Rate Turbulence? What can
presence/absence predict? - Answer-Short term
fluctuation in sinus cycle length over ~15 beats following
PVC (healthy heart increases rate)
Absence of this can predict mortality
Study that found pts with <30% EF with abnormal
Turbulence Slope and Turbulence Onset had 40% 2yr
mortality - Answer-EMIAT
When does threshold begin to rise in tined leads? -
Answer-2-3 days
Flouroquinolones is known for what cardiac effect? -
Answer-Prolonging QT
