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Table 1 Draft search strategy for MEDLINE

From: Variables associated with unplanned general adult ICU admission in hospitalised patients: protocol for a systematic review

1.

(ICU* OR “intensive care” OR “critical care”).ab,ti.

2.

INTENSIVE CARE UNITS/

3.

1 OR 2

4.

(admission* OR admitted OR transfer*).ab,ti.

5.

(“risk assessment*” OR “risk factor*” OR “risk stratif*” OR predict* OR “increased risk*” OR trigger* OR score* OR scoring OR “early warning”

OR escalat* OR deteriorat* OR triag* OR “vital sign*” OR model* OR validat*).ab,ti.

6.

3 AND 4 AND 5

7.

limit 6 to (humans AND yr = “2000 ­Current”)

8.

(observational OR “case control*” OR retrospective OR cohort* OR “systematic review*”).ab,ti.

9.

OBSERVATIONAL STUDY/

10.

CASE­CONTROL STUDIES/

11.

RETROSPECTIVE STUDIES/

12.

COHORT STUDIES/

13.

RANDOMIZED CONTROLLED TRIAL/

14.

REVIEW/

15.

COMPARATIVE STUDY/

16.

PROSPECTIVE STUDIES/

17.

VALIDATION STUDIES/

18.

8 OR 9 OR 10 OR 11 OR 12 OR 13 OR 14 OR 15 OR 16 OR 17

19.

7 AND 18

20.

(unplanned OR unexpected OR unanticipated OR emergency OR “rapid response”).ab,ti.

21.

19 AND 20