Rces Study Basic Electrophysiolgy Study

Front 1

1. Threshold

Back 1

These are assessed prior to starting the EP study.
The minimum amt. of MA necessary to start depolarization. The MA is usually set twice the threshold

Front 2

2. Corrected QT (QTC) = Bazett's Formula

Back 2

QT Interval(msec) / √ (RR interval sec.)
Normal QTc ≤ 440 msec.(know the normal )

Front 3

3. A longer QTc puts the patient at increased risk for???

Back 3

torsade de pointes

Front 4

4. Some causes of prolonged QT

Back 4

CAD,Cardiomyopathy,Severe Bradycardia, High-Grade AV Block
Anti-Arrhythmics, Psychotropic Drugs, Low Mag and calcium ,Hypothermia, Congenital Long QT Syndrome

Front 5

5. Milliamps (MA)

Back 5

A measurement of energy needed to overcome the threshold and
initiate a contraction.

Front 6

6. True or false
The smaller surface area of the diagnostic 1 mm. tip electrode catheter is better at concentrating the energy into the tissue to start a depolarization than the 4mm tip

Back 6

True

Front 7

7. True or false
The larger 8 mm ablation electrodes have more surface area require more
MA's to be able to concentrate enough energy into the muscle

Back 7

True

Front 8

8. Stimulator

Back 8

This is the equipment in the EP lab that is delivering the energy to pace.
It is very sophisticated and can be programmed to deliver stimulus at 4 different intervals if required. Ours is called a Bloom stimulator

Front 9

9. This channel is set to deliver the drive train, the first stimulus.
The drive train is 8 normal beats that the heart is paced at prior to introducing an extra stimulus. The cycle length (distance from one paced beat to the next) is started at 600ms.

Back 9

S1 Stim1 Stimulator1

Front 10

10. This is the second stimulus or the first premature beat to be
introduced after the drive train. It will be programmed to come in earlier than 600 ms. Depending on where you are in the protocol, it may be as early as 250ms

Back 10

S2 Stim2