IBHRE Electrophysiology Question and Answers () Rated A+

IBHRE Electrophysiology Question and
Answers (2025-2026) Rated A+
A SSI PM is one that? - 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? -
ANSWER-(X) AV interval duration
Sensitivity
Refractory
Output

An advantage of bipolar leads is? - 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? - ANSWER-Energy
(x) Charge
Volts
Current

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

Cardiac stimulation thresholds are expressed in terms of? - ANSWER-Voltage, current,
and energy.

Characteristic findings in patients with the PM syndrome include any of the following
except? - ANSWER-Febrile signs of PM's infection

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

For a patient with evidence of sinus node dysfunction and intermittent heart block, which
of the following pacemakers would be inappropriate? - ANSWER-DDDR
(x) AAI
VVI
VVIR

for a wire fracture the resistance? - ANSWER-increases

For voltage of 5V, resistance of 500 ohms and pulse width of .5ms, calculate the energy
delivered? - ANSWER-25 microjoules

Hysterisis is? - ANSWER-The interval the PM waits after a sensed beat before pacing