IBHRE Prep Exam questions with correct answers
Voltage is? - correct 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? - correct 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? - correct answer decrease for a wire fracture the resistance? - correct 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? - correct answer quartered Which of the following affect the longevity of the PM? - correct answer output voltage, resistance of lead and amount % pacing Which Pt's PM will last longer? - correct 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? - correct answer Cell's membrane capacitance, intracellular and extracellular resistance and threshold voltage.
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