IBHRE STUDY SET ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS

IBHRE STUDY SET ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS What lead insulation materials are known for reducing fibroblast in growth and susceptibility to MIO and ESC? - Answer -ePTFE and 80A polyurethane What are the two most common causes of ventricular safety pacing ? - Answer -Ventricular ectopy and loss of atrial sensing What electrode material would most likely result in higher pacing thresholds and high polarization? - Answer -Elgiloy Which phase of the action potential would correlate to the relative refractory period? - Answer -Phase 3 The ventricoloatrial conduction time of a pacemaker patient with a typical endless loop tachycardia may be calculated by what equation? - Answer -None What parameter would not be useful to prevent typical crosstalk? - Answer -Safety pacing What conductor technology combines a silver core with a high strength metal (MP35N0) to obtain a strong low resistance wire? - Answer -DFTWhich of the current ICD capacitor technologies provide the highest energy density and does not require reform? - Answer -Tantalum electrolytic For treatment of arrhythmias, most drugs work by ? - Answer -Altering conductivity or refractoriness What battery discharge curve shape does a lithium silver vanadium oxide battery make ? - Answer -Two humps 1.67 Hz would equal how many bum? - Answer -100 bpm T wave frequencies are typically ? - Answer -Low What is the electrical circuit that converts a signal with both positive and negative components into a signal with only one component ? - Answer -Rectifier What would account for the most common cause of inappropriate mode switching ? - Answer -Atrial lead sensing ventricular signals What is the primary reason that the lithium iodine battery has not been used for ICDs? - Answer -The battery chemistry is only 2.8V What is an example of a closed loop sensor ? - Answer -Myocardial contractility What programming changes would cause the most significant hit on an ICD battery longevity ? - Answer -ATP during charge Which of the following pace/sense lead designs would one expect the highest current density with a bipolar impedance reading of 1100 ohms ? - Answer -A Brady lead with an anode 5mm2 and cathode 1.2mm2What would the energy be given a voltage of 2V a pw of 1ms and an impedance of 400ohms? - Answer -10 uj Which of the following conditions has been shown to cause an increase in stimulation threshold, a wide qrs, latency or under sensing ? - Answer -Hyperkalemiad What is the estimated battery service life of a pacemaker with a 1 amp hr battery and a 20 micro amp current drain ? - Answer -5.7 years Which of the following clinical trial terms best describes patients analyzed in the group they were randomized to regardless of whether they received or adhered to the intervention ? - Answer -Intention to treat analysis Which of the following RV leads would be least prone to anodal stimulation in an extended bipolar configuration with a unipolar LV lead when BiV pacing ? - Answer -An integrated ICD lead with an anode 450mm2 and cathode 2mm2 The term virtuous electrode or fibrous capsule surrounding the electrode can mean ? - Answer -A normal foreign body reaction, an inexcitable capsule of tissue, decreases the current density at the lead tissue interface What would deplete a pacemaker battery most quickly ? - Answer - Increase average current drain Which of the following is most responsible for the rapid repolarization phase 3 of the cardiac action potential ? - Answer -Outflow of K+