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CCDS IBHRE Exam With 100% Correct Answers 2024

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CCDS IBHRE Exam With 100% Correct Answers 2023 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. I ... t approximates the most efficient stimulation pulse duration Charge (formula) Charge= I(current) x T(time) Furman's formula Energy(microjoules)= I(current)xV(voltage)xT(pulse width) Ohms law formula Voltage(electromotive force)= I(current/flow of electrons) x R(resistance to current flow in ohms) 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 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 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 Slew Rate Slew rate = peak slope of an electrogram slew rate= change in voltage/ change in time Normal slew rate in atrium >.3 V/s [Show More]

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