Cumulative radiation exposure from diagnostic imaging in intensive care unit patients

Table 1 Demographic and clinical data of all patients

Total patients	421
Age (yr)	58 (1-93)
Gender	256 male (61%)
Length of stay (d)	5 (range 1-100)
APACHE II score	19 (range 0-49)
Number of days intubated (d)	5.5 (1-226)
Number of deaths	59 (14%)
Number of re-admissions	46 (11%)
Total number of studies	2737
Total CED (mSv)	1704
Median CED (mSv)	1.5 (IQR 0.04-6.6)

Data are expressed as median plus range or IQR where indicated. APACHE: Acute physiology and chronic health evaluation; CED: Cumulative effective dose; IQR: Interquartile range.

Table 2 Most common primary causes for admission to the intensive care unit in the study group

	n (%)
Pulmonary oedema	42 (10)
Multiple trauma	41 (10)
Overdose	39 (9)
Sepsis	39 (9)
Seizures	34 (8)
Peripheral vascular surgery	23 (5)
Cardiogenic shock	23 (5)
Gastrointestinal disease	21 (5)

Table 3 Binominal logistic regression model assessing the influence of four factors

	B	SE	Wald	df	P vaule	OR	95%CI for OR
							Lower	Upper
APACHE	0.012	0.020	0.389	1	0.533	1.013	0.974	1.053
Intubated	-0.069	0.039	3.034	1	0.082	0.934	0.864	1.009
Age	-0.034	0.009	15.058	1	< 0.0011	0.967	0.951	0.983
LOS	0.111	0.018	39.222	1	< 0.0011	1.118	1.079	1.157
Constant	-1.752	0.451	15.095	1	< 0.0001	0.174

¹Denotes significance below the 0.05 level. APACHE II: Acute physiology and chronic health evaluation score; number of intubated days (intubated); age on admission; and LOS, on the likelihood that a patient would receive a cumulative effective dose greater than 15 mSv. APACHE: Acute physiology and chronic health evaluation; LOS: Length of stay.