IBHRE Prep Exam Latest Update -

IBHRE Prep Exam Latest Update - Actual Exam 150 Questions and 100% Verified Correct Answers Guaranteed A+

A patient on flecainide should? - CORRECT ANSWER: Have their threshold checked

A PM that paces and sense only in the ventricle and is inhibited by spontaneous

ventricular activity is designated? - CORRECT ANSWER: VVI

A SSI PM is one that? - CORRECT ANSWER: senses and pace in either the atrium or

ventricle and inhibits

All of the following functions are programmable in both VVI and DDD PM's, except? -

CORRECT ANSWER: (X) AV interval duration

Sensitivity Refractory Output

An advantage of bipolar leads is? - CORRECT ANSWER: They are less susceptible to EMI

As pulse duration is shortened below .3mse., stimulation threshold increases as

described by all of the following, except? - CORRECT ANSWER: Energy

(x) Charge Volts Current

At the time of implant we want a threshold? - CORRECT ANSWER: at .5ms to be less than 1 volt for ventricle

Cardiac stimulation thresholds are expressed in terms of? - CORRECT ANSWER:

Voltage, current, and energy.

Characteristic findings in patients with the PM syndrome include any of the following

except? - CORRECT ANSWER: Febrile signs of PM's infection

Current PM's employ which of the following chemical batteries? - CORRECT ANSWER: Lithium-iodide

For a patient with evidence of sinus node dysfunction and intermittent heart block, which

of the following pacemakers would be inappropriate? - CORRECT ANSWER: DDDR

(x) AAI VVI

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for a wire fracture the resistance? - CORRECT ANSWER: increases

For voltage of 5V, resistance of 500 ohms and pulse width of .5ms, calculate the energy

delivered? - CORRECT ANSWER: 25 microjoules

Hysterisis is? - CORRECT ANSWER: The interval the PM waits after a sensed beat

before pacing

If a unipolar lead wire has an insulation break one would expect the resistance to? -

CORRECT ANSWER: decrease

If an external PM is set to a sensitivity setting of 5mV and some R-waves go unsensed,

then you should do the following - CORRECT ANSWER: Increase sensing by lowering

sensitivity to 2.5mV.

if the output vlotage of the pacemaker is programmed from 5 volts to 2.5 volts, the

energy delivered to the heart is? - CORRECT ANSWER: quartered

If the PM output voltage is 5v and the measured lead resistance is 330 ohms, then the current that flows out of the pacemaker into the heart is? - CORRECT ANSWER: 15.15 I=V/R=5V/.33 k ohm

In a bipolar pacing ventricular PM? - CORRECT ANSWER: Both the anode and the

cathode are in the heart.

PM programmability allows which of the following? - CORRECT ANSWER: Modifying

PM function in response to changing pt. status, diagnosing PM ECG's, prolongation of battery life.

Setting a low pacing rate on a demand ventricular PM may have all of the following

benefits except? - CORRECT ANSWER: Allowing a lower output setting.

The acute threshold peaking is due to? - CORRECT ANSWER: Trauma and

inflammation

The formula for calculating rate? - CORRECT ANSWER: 60,000 ms/min - time period in ms.

The slew rate is? - CORRECT ANSWER: Change in voltage divided by time or the

slope of the EGM

The specific intracardiac event sensed by PM's is termed? - CORRECT ANSWER:

Intrinsic deflection

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The strength duration curve is dependent on the? - CORRECT ANSWER: Cell's

membrane capacitance, intracellular and extracellular resistance and threshold voltage.

The two parameters that are important for ventricular sensing and should be measured

are? - CORRECT ANSWER: R-wave amplitude and slew rate

Typical acceptable P wave amplitude values for an acute atrial lead is? - CORRECT

ANSWER: greater than 2mV

Typical acceptable R-wave amplitude values for an acute ventricular lead is? -

CORRECT ANSWER: 7-15mV

Typical lead resistance range measured in ohms is? - CORRECT ANSWER: 300-2000

ohms

Voltage is? - CORRECT ANSWER: The electromotive force pushing on electrons

What is the initial voltage of a lithium battery? - CORRECT ANSWER: 2.78V

When connecting a unipolar PM to the lead in the patient? - CORRECT ANSWER:

place the PM in the pocket to check pacing

Which of the following affect the longevity of the PM? - CORRECT ANSWER: output

voltage, resistance of lead and amount % pacing

Which of the following combinations of variables interact to determine stimulation

threshold? - CORRECT ANSWER: Voltage and pulse width

Which of the following factors does not contribute to development of the PM syndrome

w/ventricular pacing? - CORRECT ANSWER: Hysterisis

Which of the following is likely to happen during the lead maturation process? -

CORRECT ANSWER: Encapsulation of electrode with fibrin tissue

Which of the following is not an advantage of DD PM? - CORRECT ANSWER: Two

leads are required

Which of the following is/are NOT factor (s) which influence PM longevity? - CORRECT

ANSWER: Output voltage

lead resistance pulse duration (X) blanking

Which of the following statements is not true of rate-responsive ventricular PM's that

use a sensor other than the atrium? - CORRECT ANSWER: They maintain constant AV

synchrony

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