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IBHRE EXAM, PRACTICE EXAM AND STUDYGUIDE
LATEST 2025/ 2026 ACTUAL EXAM WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS
(100% VERIFIED ANSWERS) |ALREADY GRADED A+|
|| VERIFIED EXAM!!!|| ||LATEST EXAM!!!||
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
- 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 1 / 3
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= 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 2 / 3
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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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