pseudopseudofusion beat - CORRECT ANSWERS-the atrial stimulus coincides when the first portion of a wide QRS complex and a pseudofusion beat where the ventricular stimulus deforms the terminal portion of he same QRS complex
Most common cause of oversensing in AAI pacing system - CORRECT ANSWERS-...
,pseudopseudofusion beat - CORRECT ANSWERS-the atrial stimulus coincides when
the first portion of a wide QRS complex and a pseudofusion beat where the ventricular
stimulus deforms the terminal portion of he same QRS complex
Most common cause of oversensing in AAI pacing system - CORRECT ANSWERS-R
wave
treatment: lengthen the refractory period
lead insulation defect will lead to - CORRECT ANSWERS-undersensing, oversensing,
and extracardiac muscle stimulation
Fall in stimulation impedance in a constant voltage pacing system will lead to -
CORRECT ANSWERS-increase capture threshold and decrease pulse generator
longevity
Release of a ventricular stimulation from a DDD pacing system requires - CORRECT
ANSWERS-completion of the AV interval and completion of the upper rate limit interval
mode to avoid true crosstalk in dual chamber pacemaker - CORRECT ANSWERS-
commited DVI pacing since there will be no ventricular sensing following atrial output
stimulus
1 hertz equals to how many bpm? - CORRECT ANSWERS-1 Hz = 60 bpm
virtual electrode or fibrous capsule... - CORRECT ANSWERS-- normal foreign body
reaction
- an inexcitable capsule of tissue
- decreases the current density at the lead tissue interface
what necessitate the initiation of a reentry tachycardia? - CORRECT ANSWERS-a
unidirectional block of one pathway
The test to perform 10 to 20 beats after a PVC and the absence of a positive test
predicts the negative mortality after an MI - CORRECT ANSWERS-heart rate
turbulence
, at what point does the threshold rise in tined leads? - CORRECT ANSWERS-2-3 days
CMOS - CORRECT ANSWERS-Complementary Metal Oxide Semiconductor (CMOS)
circuitry uses the bipolar semiconductor devices. The main advantage of the
pacemakers of the CMOS circuitry is the low power consumption and are highly reliable.
- most susceptible to high cumulative damage from high dose radiation
defibrillation energy exceeds pacing energy by a factor of... - CORRECT ANSWERS-
1,000,000
the process of which the ICD transform electrical energy into magnetic energy to deliver
a shock - CORRECT ANSWERS-inductance
in pacing, capacitors are charged in ________, discharged in _________ ( insert
parallel or series) - CORRECT ANSWERS-parallel, series
percent tilt of an ICD waveform? - CORRECT ANSWERS-decline in leading edge
voltage at the time of truncation
most common ICD battery type - CORRECT ANSWERS-lithium silver vanadium oxide
one french size = _____ mm - CORRECT ANSWERS-0.33mm
most likely bacterial culprit immediately after pacemaker implantation - CORRECT
ANSWERS-staph aureus
pregnant woman undergoing pacemaker implant, most protective way of the baby... -
CORRECT ANSWERS-shield with lead during the procedure
prolonged radiation during the implant would cause... what problem with skin, in which
part of the body - CORRECT ANSWERS-redness and skin peeling on the back
normal PCWP - CORRECT ANSWERS-4-12mmHg
Rheobase - CORRECT ANSWERS-the lowest point on a strength duration curve at an
infinitely long pulse duration
Chronaxie time - CORRECT ANSWERS-the pulse width at twice the rheobase value. It
approximates the most efficient stimulation pulse duration
Charge (formula) - CORRECT ANSWERS-Charge= I(current) x T(time)
Furman's formula - CORRECT ANSWERS-Energy(microjoules)=
I(current)xV(voltage)xT(pulse width)
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