A field evaluation of pulse oximetry in two arduous environments.

Two portable battery powered pulse oximeters were tested on Joint Services expeditions to the Sahara Desert and the Andes mountains. Their ability to measure changes in pulse, oxygen saturation of arterial haemoglobin (SaO2), their durability, ease of use, power systems and ancillary equipment were therefore evaluated in two extreme conditions. Although durable, easy to use and with good monitoring equipment, the batteries failed in extreme cold and the integral printer was too fragile for field use.