. Author manuscript; available in PMC: 2013 Jun 5.

Published in final edited form as: Intensive Care Med. 2009 Jul 9;35(11):1886–1892. doi: 10.1007/s00134-009-1573-6

Table 2.

Transition to Delirium and Tryptophan/Large Neutral Amino Acids Ratio.

Variables	Chi-Square	P Value
Tryptophan/LNAA ratio	16.1	0.0003
Age	8.1	0.005
Modified APACHE II at enrollment	4.9	0.02
IQCODE	0.1	0.73
Previous day’s mental status	15.6	0.0004
Dexmedetomidine on previous day	0.2	0.67
Lorazepam on previous day	0.3	0.58
Fentanyl on previous day	5.23	0.02

Abbreviations: LNAA, Large Neutral Amino Acids; Modified APACHE II, Acute Physiology and Chronic Health Evaluation II excluding Glasgow coma scale; IQCODE, Informant Questionnaire on Cognitive Decline in the Elderly.