Incidence of low central venous oxygen saturation during unplanned admissions in a multidisciplinary intensive care unit: an observational study

Table 1 Demographic, ScvO₂, and outcome data

	All patients (n = 98)	Cardiocirculatory failure (n = 12)	Sepsis (n = 26)	CNS disease (n = 29)	Respiratory failure (n = 14)	Other (n = 17)
Median age in years^a	63 (19–83)	69 (39–79)	65 (35–83)	51 (19–79)	73 (32–83)	70 (28–83)
SAPS II	43 (11–92)	43 (32–89)	45 (11–87)	50 (11–92)	35 (19–86)	34 (13–58)
ScvO₂ at ICU admission (%)^a	70 ± 12	60 ± 13	68 ± 12	77 ± 12	64 ± 11	73 ± 9
ScvO₂ after six hours in ICU (%)^a	71 ± 10	67 ± 9	67 ± 10	79 ± 7	68 ± 10	68 ± 6
LOS_ICU in days^a	3 (1–28)	3 (1–9)	4 (1–25)	3 (1–28)	6 (1–28)	1 (1–10)
LOS_hospital in days	19 (1–28)	13 (1–28)	28 (1–28)	12 (1–28)	22 (7–28)	18 (5–28)
LOS_{before ICU} in days	0.3 (0–38)	0.1 (0–20)	0.8 (0–39)	0.1 (0–20)	2.4 (0–26)	0.5 (0–15)
28-day mortality (%)	18	33	27	24	7	0
FiO₂ at ICU admission	0.6 (0.3–1.0)	0.7 (0.4–1.0)	0.5 (0.3–1.0)	0.5 (0.3–1.0)	0.8 (0.4–1.0)	0.5 (0.4–0.7)
Number of organ failures	2 (0–4)	2 (1–4)	3 (0–4)^a	1 (0–3)	2 (0–4)	2 (0–4)
Percentage of patients per group with low (< 60%) ScvO₂ on ICU admission	21	17	35	3	21	6

^aKruskal-Wallis analysis for variance on ranks, p < 0.05. Values are expressed as mean ± standard deviation or as median (range). CNS, central nervous system; FiO₂, inspired fractional oxygen concentration; ICU, intensive care unit; LOS_{before ICU}, length of stay in hospital before intensive care unit admission; LOS_hospital, length of stay in hospital; LOS_ICU, length of stay in intensive care unit; SAPS II, Simplified Acute Physiology Score; ScvO₂, central venous oxygen saturation.