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CCDS IBHRE Questions with solutions 100% solved
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CCDS IBHRE Questions with solutions 100% solved Rheobase the lowest point on a strength duration curve at an infinitely long pulse duration Chronaxie time the pulse width at twice the rheobase value. It approximates the most efficient stimulation pulse duration Charge (formula) Charge= I(cur...

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  • September 23, 2024
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  • 2024/2025
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CCDS IBHRE Questions with solutions
100% solved

Rheobase the lowest point on a strength duration curve at an infinitely long pulse duration




Chronaxie time the pulse width at twice the rheobase value. It approximates the most

efficient stimulation pulse duration




Charge (formula) Charge= I(current) x T(time)




Furman's formula Energy(microjoules)= I(current)xV(voltage)xT(pulse width)




Ohms law formula Voltage(electromotive force)= I(current/flow of electrons) x

R(resistance to current flow in ohms)




Functional Refractory Period the coupling interval which first results in a measurable

degree of delay in impulse conduction




Effective Refractory Period the longest coupling interval to be associated with block

, CCDS IBHRE Questions with solutions
100% solved
Devices with NO interaction with pacers 1. microwave oven, 2. CT scan/Ultrasound 3. X-

rays (diagnostic)




Devices that cause transient or 1 beat inhibition 1. EAS 2. Cellphones 3. Arc Welding 4.

airport metal detector 5. TENS 6. Electric appliances such as electric blanket & power tools




Devices that may damage the pacemaker 1. MRI 2. Defibrillator 3. Cardioversion 4.

Cautery/RF Ablation 5. Radiation Therapy




Resistance in Series Series means the beginning of one resistance is connected to another




Sum the resistances: R1+R2= total resistance. EX: A LEAD FRACTURE (fractures INCREASE

impedance)




Resistance in Parallel Parallel means all the resistances are connected to the same point.




(R1xR2)/(R1+R2)= total resistance

, CCDS IBHRE Questions with solutions
100% solved
EX: LEAD INSULATION DEFECTS (insulation defects DECREASE impedance)




Permanent pacemakers are constant voltage or constant current? ALL permanent

pacemakers are constant voltage devices.




SOME temp pacemakers are constant voltage, most are constant current.




LOAD Load refers to impedance (or resistance) applied to a circuit.




A system with a SMALL load (low impedance) applied to the circuit is said to be a constant

current device




A system with LARGE load is said to be a constant voltage device




Guidelines for Permanent Pacing 1. Patient is symptomatic


2. The heart rate is less than 40 bpm

3. Asystole of greater than 3 seconds is documented

, CCDS IBHRE Questions with solutions
100% solved
NOTE: Pt may be asymptomatic with 2 or 3




Slew Rate Slew rate = peak slope of an electrogram




slew rate= change in voltage/ change in time




Normal slew rate in atrium >.3 V/s




Normal slew rate in ventricle >.5V/s




Steroid used in electrodes dexamethasone sodium phosphate in the silicone core(a

corticosteriod)




Steroid-Eluting Electrodes 1. The acute threshold is relatively flat compared to non-

steroid electrodes

2. The initial capture threshold is similar to non-steroid leads




Silicone Rubber lead insulation Pros 1. Can easily be repaired

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