Fig. 3: Reference and video camera-derived traces for two 30-min sample periods.
From: Non-contact physiological monitoring of post-operative patients in the intensive care unit
Heart rate and respiratory rate values for the first period are shown in panels (a) and (b), respectively. Heart rate and respiratory rate values for the second period are shown in panels (c) and (d), respectively. Reference values were provided by the patient monitoring equipment (black), and manual nursing estimates (green). Fluctuations in heart rate associated with patient movement can be observed in (a) from t = 21 min to t = 25 min. The second 30-min sample (c, d) documents a period of deterioration from t = 20 min. The camera system produced frequent observations of both vital signs in during the episode of clinical deterioration. Only one manual respiratory rate was recorded during this period, as the impedance system was disconnected.
