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IBHRE EXAM/67 ANSWERED QUESTIONS A+ GRADED
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- IBHRE EXAM/67 ANSWERED QUESTIONS A+ GRADED
IBHRE EXAM/67 ANSWERED QUESTIONS A+ GRADED
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IBHRE EXAM/67 ANSWEREDQUESTIONS A+ GRADED
Lithium iodine battery V? - -2.8V- not used for ICDs due to low peak power.
Qmr
-Lithium Iodine/ silver V? - -3.2V Qhr- used for ICDS
-Which is an example of a closed loop sensor? - -myocardial contractility
and O2 stat
-Primary Sensor - -detects changes in normal physiologic responses
-Secondary - -detects internal changes from exercise- QT MV pH
-Tertiary - -detects changes as a result of exercise- piezo accelerometer
-The smaller the cathode surface the- - -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? - -3xs (4-20mm in
pacing leads)
-ICD tip electrodes tend to run- - -2-10mm
-Rv coil size? - -300-600mm
-SVC coil size? - -400-860mm
-OHMS LAW - -V=I * R
-ENERGY EQUATION (uJ) - -V * I* PW
-I is what? - -Current- flow of electrons through a circuit
-What can cause increase in threshold, wide QRS, latency, and
undersensing? - -Hyperkalemia- high levels of potassium
-Hypercalcemia can result in? - -Short QT
-Hypocalcemia can result in? - -Long QT
-Normal Potassium level? - -3.7-5.2
, -estimated battery life? Time= - -Time= Q (battery capacity in Ah) / I
( current drain in amperes)
-Which of the following is necessary to initiate reentry tachy? - -
unidirectional block of one pathway (travels down the slow up the fast) can
be large (WPW) or small (AVNRT)
-Slew Rate - -max rate of change between the sensing electrode and first
derivative on ECG
change in V/ Change in TIme
-Frequency - -# of times a signal fluctuates in 1 sec expressed in hertz
-The Basic Unit of Capacitance is? - -Farad
-Basic Unit of Energy? - -Joule
-Unit of charge? - -Coulomb= 1 amp per second
-Microvolt T wave testing - -measures beat to beat variations in the T wave,
performed with exercise ideally hr between 105 and 110
-Heart Rate turbulence - -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? - -prolonging
the QT
-Zener Diode - -protects the pacemaker circuitry from high external
voltages
-rheobase - -lowest possible voltage that will stimulate the myocardium at
any pulse duration
-chronaxie - -twice the rheobase voltage
-watt-second - -energy
-AFFIRM - -rate control vs rhythm control and they are equivalent
-minute ventilation is the product of - -respitory rate and tidal volume. Can
be triggered by arm movements
-Parallel Circuit resistance? - -R1 * R2/ R1+ R2
-Battery capacitance of a pacemaker is given in? - -Current
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