Transcutaneous pacing (TCP) with a Lifepak 12

Image credit: Physio-Control

 

I discovered an interesting quirk about the Lifepak 12 the other day.

I’m sure many of you have been told (as I had been told) that the Lifepak 12 cannot perform TCP unless the limb lead electrodes are attached. There is a caveat to this (reference page 4-18 in the Operations Manual – this is a PDF file so “right-click” the link and select “save as”). If you are performing TCP in demand mode (even if you have it set well below the patient’s intrinsic rate and no pacing is being delivered) as soon as the monitor detects “leads off” the monitor will deliver TCP at a fixed rate until the leads are replaced or the pacer is turned off.

For example, say you have a patient with atrial fibrillation and a slow ventricular response of 50 BPM whose ventricular response occasionally drops down to 20 (with 3 – 6 second asystolic pauses during which time the patient loses consciousness and appears peri-arrest). You apply the combo-pads and set the demand pacer for 40 PPM @ 130 mA so that the patient’s heart rate cannot drop below 40 (assuming capture is achieved with 130 mA). The patient’s heart rate stays above 40 so no pacing is delivered.

At the hospital, the nurses (through no fault of their own) remove the ECG leads to switch the patient to their own Lifepak 20. What happens? Answer: The Lifepak 12 delivers fixed rate pacing at 40 PPM @ 130 mA through the combo-pads until the leads are replaced or the pacer is turned off. Not a big deal, just something to be aware of. This is not a device malfunction.

See also:

Transcutaneous pacing (TCP) – The problem of false capture

Using capnography to confirm capture with transcutaneous pacing (TCP)

58 year old male CC: Unconscious (Transcutaneous pacing failure in the setting of hyperkalemia)

Transcutaneous pacing (TCP) for asystole

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Comments
Matt King
Snapshot Case: What Happened?
Also I would be moving the combo pads around after the first unsuccessful shock to try and find the ectopic foci.
2015-05-29 10:57:55
Matt King
Snapshot Case: What Happened?
Nice case and strong work, but this is why I shock everything in an adult at 200J with a bi-phasic monitor. I would not do this if this was a pediatric PT. If the first shock at say 50-70j is not enough then that means you're just going to have to shock again and submit…
2015-05-29 10:56:24
Steve Pike
Snapshot Case: What Happened?
Thus is the story with elective electrocution. If it works, it's medicine, if it doesn't, it's murder. Every shock shown was indicated, if you don't count the first one.
2015-05-28 22:49:42
Glenda
Snapshot Case: What Happened?
torsades des pointes! Electrolytes??
2015-05-28 16:56:49
Olivier
Snapshot Case: What Happened?
To support Donovan's analysis, QRS are remarkably thin and eventually consistent with paediatric findings. However, as noted, atrial fibrillation in very young patients are quite rare.
2015-05-28 07:36:54

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