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Does the Specific Time of Day Used to Capture Data on Ventilator-Days Have an Impact on the Documented Rates of Ventilator-Associated Pneumonia?

  • Thomas R. Talbot (a1) (a2) and John M. Starmer (a3)


Definitions of ventilator-associated pneumonia do not note a preferred daily time for obtaining denominator data. We examined collecting data on the number of ventilator-days at different times of day in 7 intensive care units. Rates of ventilator-associated pneumonia did not significantly differ when denominator data were collected at midnight, 8 AM, or 4 PM, supporting standard definitions.


Corresponding author

A-2200 Medical Center North, 1161 21 st Avenue South, Vanderbilt University Medical Center, Nashville, TN 37232, (


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1.Horan, TC, Andrus, M, Dudeck, MA. CDC/NHSN surveillance definition of health care-associated infection and criteria for specific types of infections in the acute care setting. Am J Infect Control 2008;36:309332.
2.Coffin, SE, Klompas, M, Classen, D, et al.Strategies to prevent ventilator-associated pneumonia in acute care hospitals. Infect Control Hosp Epidemiol 2008;29(suppl 1):S31S40.
3. Centers for Disease Control and Prevention (CDC). The National Healthcare Safety Network (NHSN) Manual. Patient Safety Component Protocol. March 2009. Accessed July 21, 2009.


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