NEWEST CCDS IBHRE EXAM / CCDS IBHRE UPDATED
EXAM / CCS IBHRE ACTUAL EXAM 2024-2025 WITH REAL
QUESTIONS AND CORRECT VERIFIED ANSWERS (FULL
REVISED EXAM) LATEST UPDATES |GUARANTEED PASS
A+ (BRAND NEW!!)
Ohms law formula - Answer-Voltage(electromotive force)=
I(current/flow of electrons) x R(resistance to current flow in ohms)
Functional Refractory Period - Answer-the coupling interval which first
results in a measurable degree of delay in impulse conduction
Effective Refractory Period - Answer-the longest coupling interval to be
associated with block
Devices with NO interaction with pacers - Answer-1. microwave oven,
2. CT scan/Ultrasound 3. X-rays (diagnostic)
Devices that cause transient or 1 beat inhibition - Answer-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 - Answer-1. MRI 2.
Defibrillator 3. Cardioversion 4. Cautery/RF Ablation 5. Radiation
Therapy
Resistance in Series - Answer-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)
Rheobase - Answer-the lowest point on a strength duration curve at an
infinitely long pulse duration
Chronaxie time - Answer-the pulse width at twice the rheobase value. It
approximates the most efficient stimulation pulse duration
Charge (formula) - Answer-Charge= I(current) x T(time)
Furman's formula - Answer-Energy(microjoules)=
I(current)xV(voltage)xT(pulse width)
Resistance in Parallel - Answer-Parallel means all the resistances are
connected to the same point.
,(R1xR2)/(R1+R2)= total resistance
EX: LEAD INSULATION DEFECTS (insulation defects DECREASE
impedance)
Permanent pacemakers are constant voltage or constant current? -
Answer-ALL permanent pacemakers are constant voltage devices.
SOME temp pacemakers are constant voltage, most are constant
current.
LOAD - Answer-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 - Answer-1. Patient is symptomatic
2. The heart rate is less than 40 bpm
3. Asystole of greater than 3 seconds is documented
, NOTE: Pt may be asymptomatic with 2 or 3
Slew Rate - Answer-Slew rate = peak slope of an electrogram
slew rate= change in voltage/ change in time
Normal slew rate in atrium - Answer->.3 V/s
Normal slew rate in ventricle - Answer->.5V/s
Steroid used in electrodes - Answer-dexamethasone sodium phosphate
in the silicone core(a corticosteriod)
Steroid-Eluting Electrodes - Answer-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 - Answer-1. Can easily be repaired
2. Flexible
3. Proven performance history
4. Easy to make
Silicone Rubber lead insulation cons - Answer-1. high friction coefficient
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