IBHRE Actual Questions and

IBHRE Actual Questions and Answers 100% Correct

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 1 / 2

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

Normal Potassium level? - Answer 3.7-5.2

estimated battery life? Time= - Answer Time= Q (battery capacity in Ah) / I ( current drain in amperes)

Which of the following is necessary to initiate reentry tachy? - Answer unidirectional block of one pathway (travels down the slow up the fast) can be large (WPW) or small (AVNRT)

Slew Rate - Answer max rate of change between the sensing electrode and first derivative on ECG change in V/ Change in TIme

Frequency - Answer # of times a signal fluctuates in 1 sec expressed in hertz

The Basic Unit of Capacitance is? - Answer Farad

Basic Unit of Energy? - Answer Joule

Unit of charge? - Answer Coulomb= 1 amp per second

Microvolt T wave testing - Answer measures beat to beat variations in the T wave, performed with exercise ideally hr between 105 and 110

Heart Rate turbulence - Answer looks at 10 to 20 beats following a PVC.absence of it is the best non invasive prediction of cardiac mortality following a MI

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