IBHRE Exam Questions and Answers

IBHRE Exam Questions and Answers Lithium iodine battery V? - Answer-2.8V- not used for ICDs due to low peak power. Qmr Lithium Iodine/ silver V? - Answer-3.2V Qhr- used for ICDS Which is an example of a closed loop sensor? - Answer-myocardial contractility and O2 stat Primary Sensor - Answer-detects changes in normal physiologic responses Secondary - Answer-detects internal changes from exercise- QT MV pH Tertiary - Answer-detects changes as a result of exercise- piezo accelerometer The smaller the cathode surface the- - Answer-higher the current density, lower the threshold, and higher the impedance (2-6mm as small as 1.2) Anode should be how much bigger than the cathode? - Answer-3xs (4-20mm in pacing leads) ICD tip electrodes tend to run- - Answer-2-10mm Rv coil size? - Answer-300-600mm SVC coil size? - Answer-400-860mm OHMS LAW - Answer-V=I * R ENERGY EQUATION (uJ) - Answer-V * I* PW I is what? - Answer-Current- flow of electrons through a circuit What can cause increase in threshold, wide QRS, latency, and undersensing? - Answer-Hyperkalemia- high levels of potassium Hypercalcemia can result in? - Answer-Short QT Hypocalcemia can result in? - Answer-Long QT