User's Manual

Monitoring with the TD60 at the CS Arrhythmia Monitoring
TMS60 Operator’s Manual 9 - 31
■ Significant changes occurred to the patient ECG rhythm
■ A clinician has observed clinically questionable arrhythmia calls
■ “Learning” occurred during a Leads Off condition
9.6.5 Configuring the QRS Threshold
The minimum detection threshold is approximately 0.16 mV. In case the P waves are very
tall, one might consider moving the minimum QRS detection threshold up to be above
the level of the P waves, so events like ventricular standstill are not missed.
Two horizontal lines (one below and one above the baseline) appear on the screen.
These represent the current minimum detection threshold on the positive and negative
sides of the baseline so manual adjustment for both positive and negative going QRS's
can be made. Using the commands provided, move the minimum detection threshold
up or down to ensure it is above the level of the P waves but below the peak of the R-
wave. Since the P-wave height could vary a little from beat to beat, do not set the hori-
zontal line representing the minimum detection threshold at or barely above the level of
the peak of the P wave. Ensure that it is at least one or two millimeters above the peak of
the P wave but below the peak of the R-wave.
1. In the [Arrhythmia Analysis] section of the [ECG] tab, click [Minimum QRS
Threshold].
The [Minimum QRS Threshold] menu displays, as shown in the following figure.
CAUTION
• Initiate ECG relearning only during periods of normal rhythm and when
the ECG signal is relatively noise-free. If ECG learning takes place during
ventricular rhythm, the ectopics may be incorrectly learned as the nor-
mal QRS complex. This may result in missed detection of subsequent
events of V-Tach and V-Fib.