Watt-second - energy
AFFIRM - rate control vs rhythm control and they are equivalent
Minute ventilation is the product of - respiratory rate and tidal volume. Can be triggered by arm movements
Parallel Circuit resistance? - R1 * R2/ R1+ R2
Battery capacitance of a pacemaker is given...
IBHRE Exam with Verified Answers
Watt-second - ✅✅ energy
AFFIRM - ✅✅ rate control vs rhythm control and they are equivalent
Minute ventilation is the product of - ✅✅ respiratory 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
Excitable Gap - ✅✅ area of tissue in front of fibrillating wave that could trigger
a wave front block and terminate the tachycardia
Percent tilt of an ICD waveform? - ✅✅ decline in leading edge voltage at the
time of truncation
1 French size = - ✅✅ .3 mm
Will increase DFT within 2 days? - ✅✅ Flecainide
Drug interactions with amiodarone? - ✅✅ digoxin should be reduced by 50%
Warfarin should be reduced by 25%
Large amounts of grapefruit juice can also interfere
Lower DFTS? - ✅✅ Sotolol
Dofetilide
Isoproternol
N-Acetyl- P
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
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