CCDS IBHRE Questions and Correct Answers the Latest Update
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Module
CCDS IBHRE
Institution
CCDS IBHRE
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(mi...
✓ 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
✓
✓ 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
✓
✓ NOTE: Pt may be asymptomatic with 2 or 3
✓ 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
✓ 2. Flexible
✓ 3. Proven performance history
✓ 4. Easy to make
Silicone Rubber lead insulation cons
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