IBHRE EXAM, PRACTICE EXAM AND

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IBHRE EXAM, PRACTICE EXAM AND

STUDYGUIDE NEWEST 2025 ACTUAL EXAM

COMPLETE 400 QUESTIONS AND CORRECT

DETAILED ANSWERS (VERIFIED ANSWERS)

|ALREADY GRADED A+

IBHRE EXAM

What is meant by "intention to treat" analysis in a randomized control trial?

• patients are analyzed in the groups they were randomized to

regardless of whether they complied with the treatment given

• patients are analyzed in the groups they were randomized to

only if they actually received treatment

• patients are analyzed in the groups they were randomized to

unless they crossed-over into another treatment arm

• patients are only included in the analysis whose treatment was

at least somewhat effective - CORRECT ANSWER -A. Patients Are Analyzed In The Groups They Were Randomized To Regardless Of Whether They Complied With The Treatment Given

Which of the following formulas represents the fundamental unit of work? 1 / 4

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a) E=I2 x R x T

b) E=V x I x T

c) E=V2/R x T

• all of the above - CORRECT ANSWER -D. All the above

The time from electrical depolarization of the heart to mechanical systole describes which of the following terms?

• evoked response interval
• pre-ejection interval

c) QT interval

• dV/dT - CORRECT ANSWER -B. Pre-ejection Interval

Typical ventricular blanking periods in DDD pacemakers range

between:

• 1 to 10 milliseconds
• 12 to 50 milliseconds
• 50 to 100 milliseconds
• 100 to 200 milliseconds - CORRECT ANSWER -B. 12 to 50

ms 2 / 4

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The basic unit of capacitance is:

• joule
• farad
• henry
• coulomb - CORRECT ANSWER -B. Farad

Which of the following sources of device interference would be most likely to cause rapid pacing or reset to back-up mode?

• cell phone

b) MRI

• electronic article surveillance
• airport metal detectors - CORRECT ANSWER -B. MRI

The reported effects on pacemakers of radiofrequency catheter ablation performed in close proximity (< 4 cm) to pacing lead

systems include(s):

• induction of pacemaker runaway
• pacemaker reversion to noise mode behavior 3 / 4

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• inappropriate inhibition of pacemaker
• all of the above - CORRECT ANSWER -D. All the above

Which of the following would increase pacing lead impedance?

• smaller electrode
• shorter conductor
• insulation break
• programming to unipolar - CORRECT ANSWER -A. Smaller

Electrode

Polarization impedance refers to what general area of the pacing system?

• electrode/tissue interface
• lead body
• header
• circuit board - CORRECT ANSWER -A. Electrode / Tissue

Interface

A pause in paced rhythm below the base rate may be normally

explained by:

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