User Manual Part 3

SYSTEM DIAGNOSTICS

LEAD TESTS

6-9

Thetestbeginsataspeciﬁed startin g value an d steps that value down

(amplitude or pulse width) as the test progresses. The PRM beeps with each

decrement. The values used during the threshold test are programmable.

The parameters are only in effect during the test. Testing for a chamber is

allowed only when pacing is active for that chamber in the mode speciﬁed in

the start column.

NOTE: The starting values for Amplitude and Pulse Width values are

automatically calculated. The device retriev es the sto red results for the

previous pace threshold m easurement (for the parameter being tested) and

sets the parameter at three steps above the previous threshold measurement.

The LRL is preselected at 90 ppm. For DDD mode, the LRL is further limited

to 10 ppm below the MTR.

NOTE: If DDD mode is chosen, selecting either the atrial or ventricular test

will cause the pacing output to decrease only in the chamber selected.

CAUTION: Durin g the LV threshold test, RV bac kup p acing is un available.

NOTE: When VVI mode and a ventricular test are s elected, only the pacing

output of the selected ventricular chamber decreases; the other ventricular

chamber is not affected.

NOTE: When DDD mode and a ventricular test are selected, only the pacing

output of the selected ventricular c hamber decreases; the atrium is paced at a

continuous amplitude, and the other ventricular chamber is not paced.

Once the test is started, the device operates with the speciﬁed brady

parameters. Using the programmed number of cycles per step, the device

then decrements (steps down) the selected test type parameter (Amplitude or

Pulse Width) until the test is complete. Real-time electrograms and annotated

event markers, which include the values being tested, continue to be available

during threshold testing. The display will automatically adjust to reﬂect the

chamber being tested.

During the threshold test, the programmer displays the test parameters in a

window while the test is in progress. To pause the test or perform a manual

adjustment, select the Hold button on the window. Select the + or − button to

manually increase or decrease the value being tested. To continue the test,

select the Continue button.

- DRAFT -