​Buist MD, Jarmolowski E, Burton PR, Bernard SA, Waxman BP, Anderson J. Recognising clinical instability in hospital patients before cardiac arrest or unplanned admission to intensive care. A pilot study in a tertiary-care hospital. Medical Journal of Australia. 1999;171(1):22-25.

Over a 12-month period relatively few patients suffered a critical event, but those who did frequently manifested abnormalities in simple physical observations and laboratory tests prior to the critical event. 

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