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Pulse Oximetry
The objective is to set the threshold so a gate is present above each peak in the pleth
waveform with no extra gates.
For mice, the signal strength will be 4 or more and the best selection for the threshold is
11 to 20. For rats, the signal can be 6 or more and the threshold can increase to 20 to
40. For humans, the signal can be 10-15 with a threshold setting in excess of 75.
The standard plethysmogram detection algorithm is optimized for small signals and high
heart rates.
As a result, the standard algorithm does not give reliable results for
humans and larger animals like pig and monkeys. There is an algorithm available that
is optimized for large signal and low heart rates (contact SAII Customer Service).
Revision C, August 2013
11-7
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