"Capt. Rob" wrote in message
ups.com...
ECG leads are attached to the body while the patient lies flat on a bed
or table.

What about the Bruce test (you know the treadmilll stress test, the patient
is upright and walking)

Leads are attached to each extremity (4 total) and to 6
pre-defined positions on the front of the chest (Fig.121a).


That's just wonderful! Which manufacturer makes an ECG machine that requires
4 noise cancelling leads?



A small
amount of gel is applied to the skin, which allows the electrical
impulses of the heart to be more easily transmitted to the ECG leads.

What about shaving and vigorously cleaning of the skin?


The leads are attached by small suction cups, Velcro straps, or by
small adhesive patches attached loosely to the skin.

Don't forget the leads with the small screws too. None of them attach
loosely, the artifact and contact impedance would be too high.

The test takes
about 5 minutes and is painless.

5 minutes? What are you testing for? The discover of some cardiac anomolies
requires weeks of testing ( that's what holters are for). Are you testing
that the machine is working?

In some instances, men may require the
shaving of a small amount of chest hair to obtain optimal contact
between the leads and the skin.

Now we hear about shaving! What about rubbing off the dead layer of skin?

12 leads may be employed for ECG using pre-defined positions on each
extremity (Fig 123b).

12 leads on each extremity? Check you typing there kiddo. In practice one
lead is used on an extremity. It is used to cancel noise. The extremity lead
sees almost no cardiac signal but the same induced noise (typically 50 or 60
Hz) as the chest electrodes. The extremity lead signal is used in conjuction
with the chest electrodes to input to a differential amplifier. The noise
signal is a common mode signal (common to both ECG electrodes and extremity
reference) which is cancelled by the differential amplifier. Typical CMRR
(common mode rejection ratios) for the differential amplifier are 90-110 dB.


Keep flopping about RB. Every EKG requirement on the ST Francis Hospital
(that's where your wife works) job postings (and there are a LOT of them)
requires 12 lead EKG of each nurse. Where are the 10 lead requirements? The
9 lead requirements?

Your nurse textbook doesn't fit the real world much does it?

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And to toss some salt on those wounds:

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Try again.