Bard Sherlock 3CG TCS, Instructions For Use Manual, Page: 23 / 28

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Sherlock 3CG™ Tip Confirmation System
6.2 ECG Troubleshooting
Flat-line ECG signal
Poor ECG signal
Wandering ECG baseline
ECG signal abnormal
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No fin connection.
Fully seat fin on the sensor.
No ECG electrode connection.
Ensure that the area on the skin where the ECG electrodes were placed is oil free
and completely dry.
Damaged ECG electrodes.
Ensure catheter T-lock connections are fully seated.
Replace electrodes.
Air bubble at the catheter tip.
Flush the catheter lumen containing the stylet with saline.
No stylet-to-fin connection.
Fully seat the stylet connector on the fin. Refer to the Bard Access Systems’ catheter
instructions for use.
Fin and/or stylet connectors not fully seated.
Fully seat fin on sensor. Fully seat stylet connector on fin.
Poor ECG electrode contact.
Ensure that the area on the skin where the ECG electrodes were placed is oil free
and completely dry.
Patient movement.
Ask the patient to remain still. Ensure the patient is warm and relaxed.
Extraneous noise.
Unplug the Site~Rite™ 6 Ultrasound System from AC power.
Make Sure the Ultrasound probe is not in close proximity to the sensor and/or lead wires.
Damaged ECG electrodes.
Replace electrodes.
Catheter not locked with saline.
Ensure catheter T-lock connections are fully seated. Flush the catheter lumen
containing the stylet with saline.
The External ECG signal, with black electrode on the patient’s left shoulder
(Lead III view) is weak.
Place black electrode on the patient’s right shoulder (Lead II view).
Poor ECG electrode contact.
Ensure that the area on the skin where the ECG electrodes were placed is oil
free and completely dry.
Patient movement.
Ask the patient to remain still. Ensure the patient is warm and relaxed.
Extraneous noise.
Avoid touching the stylet or electrodes.
Catheter not locked with saline.
Ensure catheter T-lock connections are fully seated. Flush the catheter lumen
containing the stylet with saline.
Body ECG leads swapped.
Place ECG leads correctly.
No distinct P-wave.
Do not rely on ECG guidance for catheter tip confirmation. Refer to
Warnings Section.
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