IBHRE Prep Exam Questions & Answers 2023/2024

IBHRE Prep Exam Questions & Answers 2023/2024 Voltage is? - ANSWER-The electromotive force pushing on electrons If the PM output voltage is 5v and the measured lead resistance is 330 ohms, then the current that flows out of the pacemaker into the heart is? - ANSWER-15.15 I=V/R=5V/.33 k ohm If a unipolar lead wire has an insulation break one would expect the resistance to? - ANSWER-decrease for a wire fracture the resistance? - ANSWER-increases if the output vlotage of the pacemaker is programmed from 5 volts to 2.5 volts, the energy delivered to the heart is? - ANSWER-quartered Which of the following affect the longevity of the PM? - ANSWER-output voltage, resistance of lead and amount % pacing Which Pt's PM will last longer? - ANSWER-#1: AMP=5V, L.R.=90, resistance 500ohms, PW=.5ms, 100%pacing #2: AMP=5V, L.R.=60, resistance 500ohms, PW=.5ms, 100%pacing #3: AMP=2.5V, L.R.=60, resistance 330ohms, PW=.5ms, 100% pacing (#4: AMP=2.5v, L.R.=60, resistance 500ohms, PW=.5ms, 50%pacing) The strength duration curve is dependent on the? - ANSWER-Cell's membrane capacitance, intracellular and extracellular resistance and threshold voltage.