IBHRE questions with correct answers

Lithium iodine battery V? - correct answer 2.8V- not used for ICDs due to low peak power. Qmr Lithium Iodine/ silver V? - correct answer 3.2V Qhr- used for ICDS Which is an example of a closed loop sensor? - correct answer myocardial contractility and O2 stat Primary Sensor - correct answer detects changes in normal physiologic responses Secondary - correct answer detects internal changes from exercise- QT MV pH Tertiary - correct answer detects changes as a result of exercise- piezo accelerometer The smaller the cathode surface the- - correct 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? - correct answer 3xs (4-20mm in pacing leads) ICD tip electrodes tend to run- - correct answer 2-10mm Rv coil size? - correct answer 300-600mm SVC coil size? - correct answer 400-860mm OHMS LAW - correct answer V=I * R