Table 3 Physiological characteristics of the patients—prospective phase (N = 30 patients)
Physiological characteristics | |
Age (mean ± SD) | 61.4 ± 11.8 |
Sex ratio (F/M) | 11/19 |
BMI (kg/m2; mean ± SD) | 27.1 ± 7.0 |
SAPS II (mean ± SD) | 41.8 ± 16.8 |
Chronic respiratory disorder n-(%) | 10 (33.3) |
Immunodepression n-(%) | 2 (6.7) |
Admission diagnosis | |
Respiratory failure n-(%) | 23 (76.7) |
Cardiovascular failure n-(%) | 1 (3.3) |
Neurological failure n-(%) | 3 (10.0) |
Other n-(%) | 2 (6.6) |
ICU length of stay (day; mean ± SD) | 16.3 ± 15.5 |
Hospital length of stay (day; mean ± SD) | 27.9 ± 20.8 |
Overall survival rate n-(%) | 22 (73.3) |
Respiratory conditions | |
Mechanical ventilation n-(%) | 10 (33.3) |
Spontaneous ventilation n-(%) | 20 (66.6) |
SpO2 (%; mean ± SD) | 93.1 ± 2.5 |
PaO2/FIO2 or SpO2/FIO2 (mean ± SD) | 311 ± 79 |
Sedation n-(%) | 6 (20) |
Hemodynamic conditions | |
Heart rate (b/min; mean ± SD) | 94.2 ± 18.9 |
Mean arterial blood pressure (mmHg; mean ± SD) | 87.2 ± 19.2 |
Atrial fibrillation | 0 (0) |
Vasopressive agents n-(%) | 5 (16.7) |
Hemodynamic instability n-(%) | 2 (6.7) |
Number of patients with reference values | |
RR-Manual (reference) n-(%) | 30/30 (100) |
RR-ECG n-(%) | 28/30 (93.3) |
RR-PPG n-(%) | 30/30 (100) |
Measurements | |
Reference RR (c/min) | 22 ± 4 |
Estimated RR-PPG (c/min) | 22 ± 5 |
Estimated RR-ECG (c/min) | 23 ± 6 |