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CRM IBHRE Guaranteed To Pass Concepts.
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CRM IBHRE Guaranteed To Pass Concepts.
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CRM IBHRECRM IBHRE Guaranteed To
Pass Concepts.
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)
Energy (formula) - ✔✔✔ - Energy(microjoules)= I(current)xVxT
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
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
CRM IBHRE Page 1
, CRM IBHRE
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
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
CRM IBHRE Page 2
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