Specifications

7 x 9 inches (178 mm x 229 mm)
Medtronic Confidential
Refer to the “Reference man.” category in doc#163256 for Printing
Instructions.
196407001 Rev A
B. Measuring the Amplitude Threshold
Execution of step 2 on the previous page displays the threshold test parame-
ter setup options as shown in this example.
1. Use the [∧
∧∧
∧] and [∨
∨∨
∨] buttons to adjust each of the parameter values to
the desired test setting.
Lower Rate
— Adjust to a value high enough to effect consistent
pacing. Loss of capture cannot be determined if the pacemaker is
inhibited.
Paced/Sensed AV
— If the test mode is DDD, adjust this interval to a
value short enough to provide a consistently paced ventricular rhythm.
The selected value applies to both Paced AV and Sensed AV intervals.
Pulse Width
—
Adjust to the pulse width value you want in effect
during the amplitude test. This value cannot be less than 1.0 ms.
Amplitude
— Adjust to the value at which you want the amplitude test
to start. This value must be high enough to provide consistent capture.
Pulses Per Decrement
— Adjust to the number of pacing cycles you
want to occur at each test value before reduction occurs (see page 7-4).
2. Position the programming head and hold it steady in position for the
remainder of this procedure. Observe that Marker telemetry appears
below the ECG trace.
3. Press and hold [
PROGRAM
] to execute the amplitude threshold test.
The threshold test execution window shows the temporary values in
effect. The arrow (<<<===) points to the value being reduced.
Observe the patient’s ECG trace as the programmer automatically
reduces amplitude one programmable step every 3 to 15 pacing cycles
(as selected in step 1). An audible “beep” indicates confirmation of
each new amplitude value.
4. When capture is lost, immediately release [
PROGRAM
].
7-6 Using the Programmer