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CCDS IBHRE Questions And Answers Latest 2024/ 2025 Graded A+ | 100% Verified!
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CCDS IBHRE Questions And Answers Latest 2024/ 2025 Graded A+ | 100% Verified!
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CCDS IBHRE1. Rheobase: the lowest point on a strength duration curve at an infinit duration
ely long
2. Chronaxie time: the pulse width at twice the rheobase value. It
approximates the
most efficient stimulation pulse duration
3. Charge (formula): Charge= I(current) x T(time)
4. Furman's formula: Energy(microjoules)= I(current)xV(voltage)xT(pulse
width)
5. Ohms law formula: Voltage(electromotive force)= I(current/flow of
electrons) x R(resistance to current flow in ohms)
6. Functional Refractory Period: the coupling interval which first results in
a mea- surable degree of delay in impulse conduction
7. Effective Refractory Period: the longest coupling interval to be
,associated with block
8. Devices with NO interaction with pacers: 1. microwave oven, 2. CT
scan/Ultra- sound 3. X-rays (diagnostic)
9. 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
10.Devices that may damage the pacemaker: 1. MRI 2. Defibrillator 3.
Cardiover- sion 4. Cautery/RF Ablation 5. Radiation Therapy
11.Resistance in Series: Series means the beginning of one resistance
is con- nected to another
Sum the resistances: R1+R2= total resistance. EX: A LEAD FRACTURE
(fractures INCREASE impedance)
12.Resistance in Parallel: Parallel means all the resistances are
connected to the same point.
,(R1xR2)/(R1+R2)= total resistance
EX: LEAD INSULATION DEFECTS (insulation defects DECREASE
impedance)
13.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.
14.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
15.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
NOTE: Pt may be asymptomatic with 2 or 3
16.Slew Rate: Slew rate = peak slope of an electrogram
slew rate= change in voltage/ change in time
17.Normal slew rate in atrium: >.3 V/s
18.Normal slew rate in ventricle: >.5V/s
19.Steroid used in electrodes: dexamethasone sodium phosphate in the
silicone core(a corticosteriod)
20.Steroid-Eluting Electrodes: 1. The acute threshold is relatively flat
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