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
test value before it automatically reduces the test value. As described in the
test procedures that follow, you can adjust the number of pacing cycles
(labeled “Pulses Per Decrement”) from 3 to 15 as desired.
A value should be chosen that allows adequate time to evaluate the patient’s
ECG to determine whether or not capture is maintained or lost.
The programmer uses Marker telemetry to count pacing cycles during the
execution of a threshold test. If “Sensor” telemetry is programmed or Pace
markers are not otherwise being received, pacing cycles cannot be counted.
In such cases, the timing between automatic output reductions will default
to 8 seconds, and the selected number of pulses per decrement will not
apply.
NOTE: If the selected threshold test mode is DDD, the programmer will
count two Pace markers as one pacing cycle. If only one chamber is being
paced (pacing in the other chamber is inhibited), the number of pacing
cycles that occur between each test value reduction will be twice the
number selected for Pulses Per Decrement.
NOTE: The time lapse between automatic test value reductions will not be
greater than 8 seconds, regardless of the selected number of pulses per
decrement.
Conducting a Strength-Duration Curve
Threshold Test
The procedure for conducting a Strength-Duration Curve Threshold test
involves determining a threshold value for both amplitude and pulse width
(see page 7-3). This procedure is divided into four parts: A, B, C, and D.
To conduct this test, you must complete all four parts.
A. Selecting the Threshold Test
This procedure begins at the Threshold Test Start screen (see page 7-2).
1. If the permanent pacing mode is a dual chamber mode, select the
desired “chamber/mode” button — [
Atrial/DDD
] for example.
2. Select the [
STRENGTH
-
DURATION CURVE THRESHOLDS
] button.
Determining and Evaluating Parameter Settings 7-5