IBHRE Exam With 100% Correct
Answers 2023
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
ENERGY EQUATION (uJ) - Correct Answer-V * I* PW
I is what? - Correct Answer-Current- flow of electrons through a circuit
What can cause increase in threshold, wide QRS, latency, and undersensing? - Correct
Answer-Hyperkalemia- high levels of potassium
Hypercalcemia can result in? - Correct Answer-Short QT
Hypocalcemia can result in? - Correct Answer-Long QT
Normal Potassium level? - Correct Answer-3.7-5.2
, estimated battery life? Time= - Correct Answer-Time= Q (battery capacity in Ah) / I (
current drain in amperes)
Which of the following is necessary to initiate reentry tachy? - Correct Answer-
unidirectional block of one pathway (travels down the slow up the fast) can be large
(WPW) or small (AVNRT)
Slew Rate - Correct Answer-max rate of change between the sensing electrode and first
derivative on ECG
change in V/ Change in TIme
Frequency - Correct Answer-# of times a signal fluctuates in 1 sec expressed in hertz
The Basic Unit of Capacitance is? - Correct Answer-Farad
Basic Unit of Energy? - Correct Answer-Joule
Unit of charge? - Correct Answer-Coulomb= 1 amp per second
Microvolt T wave testing - Correct Answer-measures beat to beat variations in the T
wave, performed with exercise ideally hr between 105 and 110
Heart Rate turbulence - Correct 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
Fluoroquinolone antibiotic is known for what cardiac effect? - Correct Answer-prolonging
the QT
Zener Diode - Correct Answer-protects the pacemaker circuitry from high external
voltages
rheobase - Correct Answer-lowest possible voltage that will stimulate the myocardium at
any pulse duration
chronaxie - Correct Answer-twice the rheobase voltage
watt-second - Correct Answer-energy
AFFIRM - Correct Answer-rate control vs rhythm control and they are equivalent
minute ventilation is the product of - Correct Answer-respitory rate and tidal volume.
Can be triggered by arm movements
Parallel Circuit resistance? - Correct Answer-R1 * R2/ R1+ R2
Answers 2023
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
ENERGY EQUATION (uJ) - Correct Answer-V * I* PW
I is what? - Correct Answer-Current- flow of electrons through a circuit
What can cause increase in threshold, wide QRS, latency, and undersensing? - Correct
Answer-Hyperkalemia- high levels of potassium
Hypercalcemia can result in? - Correct Answer-Short QT
Hypocalcemia can result in? - Correct Answer-Long QT
Normal Potassium level? - Correct Answer-3.7-5.2
, estimated battery life? Time= - Correct Answer-Time= Q (battery capacity in Ah) / I (
current drain in amperes)
Which of the following is necessary to initiate reentry tachy? - Correct Answer-
unidirectional block of one pathway (travels down the slow up the fast) can be large
(WPW) or small (AVNRT)
Slew Rate - Correct Answer-max rate of change between the sensing electrode and first
derivative on ECG
change in V/ Change in TIme
Frequency - Correct Answer-# of times a signal fluctuates in 1 sec expressed in hertz
The Basic Unit of Capacitance is? - Correct Answer-Farad
Basic Unit of Energy? - Correct Answer-Joule
Unit of charge? - Correct Answer-Coulomb= 1 amp per second
Microvolt T wave testing - Correct Answer-measures beat to beat variations in the T
wave, performed with exercise ideally hr between 105 and 110
Heart Rate turbulence - Correct 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
Fluoroquinolone antibiotic is known for what cardiac effect? - Correct Answer-prolonging
the QT
Zener Diode - Correct Answer-protects the pacemaker circuitry from high external
voltages
rheobase - Correct Answer-lowest possible voltage that will stimulate the myocardium at
any pulse duration
chronaxie - Correct Answer-twice the rheobase voltage
watt-second - Correct Answer-energy
AFFIRM - Correct Answer-rate control vs rhythm control and they are equivalent
minute ventilation is the product of - Correct Answer-respitory rate and tidal volume.
Can be triggered by arm movements
Parallel Circuit resistance? - Correct Answer-R1 * R2/ R1+ R2
