User manual

Checking Signal Quality
2-5
Chapter 2
Recording an ECG
2Checking Signal Quality
You can produce better ECGs by previewing the lead traces on the screen before you
record the ECG. By observing the traces and adjusting the leads accordingly, you
can make the best possible ECG.
The screen displays the output from the selected three leads whenever the
cardiograph is on. The leads are displayed in five groups of three leads each as listed
below:
• To select which three leads to display on the screen, press the key to dis-
play the next lead group, or the key to display the previous lead group.
• Before you connect the electrodes, each lead displays on the screen as a dotted
line, indicating that at least one of the electrodes associated with the lead is not
connected. The dotted line is known as a “leads off” trace. Use the leads off
labels (See Table 2-1) to determine which leads are off.
• As you connect the electrodes to the patient, the lead waveforms are displayed
on the screen.
Table 2-2 Lead Groups
Group Leads Displayed
Group 1 I, II, III
Group 2 aVR, aVL, aVF
Group 3 V1, V2, V3
Group 4 V4, V5, V6
Group 5 II-aVF-V2