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Chapter 10 Follow-up Procedures
Evia HF / HF-T Technical Manual
PAGE 98
10.3 Threshold Test
Figure 56: Main Threshold Test Screen
The atrial and ventricular pacing thresholds are determined using a high-precision threshold test found
under the Threshold tab, as illustrated in Figure 56 . The right or left ventricular test can be performed
in the DDD or VVI mode manually at a user-defined rate between 30 and 120 ppm. The ventricular
threshold test can also be performed automatically in the DDD, VDD, and VVI modes and will be
performed the same way the VCC test is performed.
Figure 57: Threshold Test Choices
The atrial test can be performed in the DDD or AAI modes as well as automatically in the DDI mode.
Mode options are shown in Figure 57 . In addition, the atrial IEGM screen can be displayed during the
atrial threshold test by toggling the ECG/IEGM button. Examples of performing the threshold test with
ECG or IEGM are shown in Figure 58 and Figure 59 . As with all screens, the patient’s intrinsic rate is
displayed in the upper right hand corner of the screen. The intrinsic rate helps the user select the best
pacing rate for the test.