Effect of Pulse Oximeter Device on Measured Perfusion Index Values

The volunteer's hands are at rest and PI readings are taken for six minutes. After two minutes, there is always a randomized rotation of the sensors between the fingers.

The volunteer periodically spreads his/her fingers and clenches them into a fist, and PI readings are taken for six minutes. After two minutes there is always a randomized rotation of sensors between the fingers.

The volunteer's arm is constricted using a cuff to measure non-invasive blood pressure. The perfusion index value is monitored during the time of cuff pressure and cuff release. The measurement is followed by a 4-minute pause to allow the vascular supply to stabilize, the sensors are randomly rotated, and the measurement is repeated.