Lead Fail Indication
Lead Fail (illustrated below) is an INOP alarm that will be displayed when the ECG trace can no
longer be produced because one of the electrodes required for measurement is disconnected—
either an electrode came off of the patient, an ECG lead cable clip came off of the electrode, or a
wire in the ECG lead cable has failed. Depending upon the Trace A Lead (or Trace B Lead) setting
(see page 5‐27), the electrode fault indicator(s), LL, LA, or RA, may be displayed in the ECG VS box
(see the example below); see page 4‐31 for more information.
Failure to respond to a Lead Fail alarm will result in a lapse of patient monitoring.
Expression MR400 Instructions for Use Monitoring ECG 5‐15
Ensure that the ECG signal has the necessary amplitude by checking
the displayed waveform; see Checking the ECG Signal Strength on
If Lead Fail is displayed, see page 5‐15 for troubleshooting details;
or, if Lead Saturation is displayed, replace the Quadtrode
electrode, see page 5‐11.
During a Lead Fail condition, if the HR Source is set to ECG, then no
measurement numeric will be displayed in the ECG and SPO2 VS
boxes; see pag
Keep the module outside the MR system bore by placing it in one
of the two locations shown in Positioning the ECG Lead Cable and
wECG Module for Scanning on page 5‐20.
Lead Fail message indication
Electrode fault indication, example
e 5-15 for an example.