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Devices Flashcards

0
Q

AOO

A

A paced, nonsense, atrial asynchronous pacing at lower pacing rate

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1
Q

What is VVI

A

V pace, V sense, sensed intrinsic QRS inhibits V pace

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2
Q

AAI

A

A pace, a sense, intrinsic P wave inhibits atrial pacing

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3
Q

DDD

A

Both paced, both sense, intrinsic p wave and QRS can inhibit pacing, peace can trigger paced QRS

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4
Q

DDI

A

A and V pace and sense, no tracking of P waves

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5
Q

For a patient with evidence of SN dysfunction and intermittent heart block, what pacemaker setting would be most appropriate?

A

DDD

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6
Q

If a pacemaker is programmed with an output of 5v and the measured lead resistance is 330ohms, what is the current that flows out of the pacemaker and into the tissue?

A

15.15mA

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7
Q

Fractured pacemaker lead, with obvious separation of the lead body would have what effect on lead resistance?

A

Increase

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8
Q

Disruption of the inner lead insulation, allowing conductors to touch would effect the lead resistance by—lead resistance.

A

Decrease

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9
Q

A lead fracture would result in:

A

Decreased current drain

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10
Q

Lead insulation failure characteristics commonly include?

A

Extra cardiac stimulation

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11
Q

What is the voltage measurement of a pacing system with a resistance of 50ohms, current of 5.0 milliamp a and pacing rate of 60ppm?

A

2.5v

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12
Q

Pacemaker syndrome can occur in what pacing mode?

A

DDD, VDD, VVI

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13
Q

The horizontal asymptote of strength duration curve is termed?

A

Rheobase

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14
Q

What are the indications for an ICD?

A

Cardiac arrest due to VF or VT, spontaneous VT, lVEF <30%, symptoms

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15
Q

In an ICDthe time required to charge the capacitors is a useful measure of what?

A

Battery status

16
Q

What describes a defibrillator algorithm that discriminates between atrial fib and ventricular tach on the basis of cycle length variability?

A

Stability

17
Q

The efficacy of ATP in terminating spontaneous VT is approximately what %?

A

90%

18
Q

How much greater thank the DFT should the max energy output of an ICD be?

A

10j

19
Q

The SCD-HeFT trial showed a clinically and statistically significant benefit for what patients?

A

ICDs in heart failure patients with EF <=35%

20
Q

During ICD troubleshooting for noncardioversion a large increase in the lead impedance of an integrated bipolar would most likely to indicate what?

A

Lead fracture

21
Q

What will increase a patients defib threshold?

A

Pneumo

22
Q

What drug is known to in increase chronic pacing thresholds and decrease chronic defib thresholds?

A

Lidocaine

23
Q

Name the three primary prevention trials in post infarct pts showing reduced mortality with ICD mortality of 54,55 and 31% respectively?

A

MADIT, MUSTT, MADITII

Drugs (5 decks)

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