CCDS IBHRE EXAM QUESTIONS AND

CCDS IBHRE EXAM QUESTIONS AND

ANSWERS 100% SOLVED (Newest 2025) Rheobase - Correct Answers ✅the lowest point on a strength duration curve at an infinitely long pulse duration Chronaxie time - Correct Answers ✅the pulse width at twice the rheobase value. It approximates the most efficient stimulation pulse duration Charge (formula) - Correct Answers ✅Charge= I(current) x T(time) Furman's formula - Correct Answers ✅Energy(microjoules)= I(current)xV(voltage)xT(pulse width) Ohms law formula - Correct Answers ✅Voltage(electromotive force)= I(current/flow of electrons) x R(resistance to current flow in ohms) Functional Refractory Period - Correct Answers ✅the coupling interval which first results in a measurable degree of delay in impulse conduction Effective Refractory Period - Correct Answers ✅the longest coupling interval to be associated with block 1 / 4

CCDS IBHRE EXAM QUESTIONS AND

ANSWERS 100% SOLVED (Newest 2025) Devices with NO interaction with pacers - Correct Answers ✅1. microwave oven, 2. CT scan/Ultrasound 3. X-rays (diagnostic) Devices that cause transient or 1 beat inhibition - Correct Answers ✅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 - Correct Answers ✅1. MRI 2. Defibrillator 3. Cardioversion 4.Cautery/RF Ablation 5. Radiation Therapy Resistance in Series - Correct Answers ✅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 - Correct Answers ✅Parallel means all the resistances are connected to the same point.(R1xR2)/(R1+R2)= total resistance

EX: LEAD INSULATION DEFECTS (insulation defects DECREASE

impedance) 2 / 4

CCDS IBHRE EXAM QUESTIONS AND

ANSWERS 100% SOLVED (Newest 2025) Permanent pacemakers are constant voltage or constant current? - Correct Answers ✅ALL permanent pacemakers are constant voltage devices.SOME temp pacemakers are constant voltage, most are constant current.LOAD - Correct Answers ✅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 - Correct Answers ✅1.Patient is symptomatic

• The heart rate is less than 40 bpm
• Asystole of greater than 3 seconds is documented

NOTE: Pt may be asymptomatic with 2 or 3 3 / 4

CCDS IBHRE EXAM QUESTIONS AND

ANSWERS 100% SOLVED (Newest 2025) Slew Rate - Correct Answers ✅Slew rate = peak slope of an electrogram slew rate= change in voltage/ change in time Normal slew rate in atrium - Correct Answers ✅>.3 V/s Normal slew rate in ventricle - Correct Answers ✅>.5V/s Steroid used in electrodes - Correct Answers ✅dexamethasone sodium phosphate in the silicone core(a corticosteriod) Steroid-Eluting Electrodes - Correct Answers ✅1. The acute threshold is relatively flat compared to non-steroid electrodes

• The initial capture threshold is similar to non-steroid leads

Silicone Rubber lead insulation Pros - Correct Answers ✅1.Can easily be repaired

• Flexible
• Proven performance history
• Easy to make
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