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IBHRE Practice Test questions and answers.
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IBHRE Practice Test questions and answers.
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IBHRE Practice Test questionsand answers
What current ICD capacitor technologies provide the highest energy
density and does not require reformation? - answer Tantalum
Electrolytic
1.67 Hz would equal how many bpm? - answer 100 bpm
1 bpm = 0.0166667 Hz
Which pace/sense lead designs would one expect the highest
current density w/ a bipolar impedance reading of 1100 ohms? -
answer Brady lead w/ anode of 4.2 mm2 and cathode 5.2 mm2
What is the voltage measurement of a pacing system w/ impedance
of 500 ohms, current of 5.0 milliamp and pulse width of 0.4 ms and
rate of 60 bpm? - answer V = 2.5 V
V=I x R
= 5.0 milliamps x 500 ohms
= 2,500 millivolts
=2,500/1000
What condition is shown to have an increase stimulation threshold,
wide QRS, latency, or under sensing? - answer Hyperkalemia (high
potassium)
What is the estimated battery longevity of a pacemaker with 1.0
amp-hour battery and 20 microamp drain ? - answer Longevity =
114 x (amp-hours/microamp drain)
, = 114 x (1.0/20)
= 5.7 years
Which sensing related parameter represents the maximal rate of
change of the electrical potential between the sensing electrode
and is the first derivative of the electrogram? - answer Slew rate
The isovolumetric time from electrical depolarization of the heart to
mechanical systole describes what term? - answer Pre-ejection
interval
What test is typically performed during exercise with HR around
105-115 and was shown to have a negative predictive value in
MADIT II and SCD-HeFT? - answer Micro volt t-wave alternans
Which battery chemistry is now incorporated into pacemakers? -
answer Lithium silver vanadium & lithium carbon mono fluoride
What test is performed over 10-20 beats following a PVC and whose
absence is a predictor of cardiac mortality following an MI? - answer
Micro volt t-wave alternans
Fluoroquinolones, a new gen antibiotic is known for which cardiac
effect? - answer Prolonging QT
What would decrease stim thresholds and current drain? - answer
Reducing electrode surface area
Ex: from 12mm to 8mm
Match the units: watt-second - answer Power
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