Fig. 2.

Synchronous amplitude-stable $P_{{\text{O}}_2}$ oscillations (5–50 kPa [37–375 mmHg]), recorded 5 h after both sensors were immersed in flowing blood at 39 °C, are shown as a function of time. Colour coding, sampling rate, and duty cycle are the same as in Fig. 1. The PMMA sensor is seen to detect most of the $P_{{\text{O}}_2}$ oscillation amplitude at each RR.