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Antibiotic timing and errors in diagnosing pneumonia.

James A Welker¹, Michelle Huston, Jack D McCue

¹Department of Medicine, University of Maryland School of Medicine, and Franklin Square Clinical Research Center, Franklin Square Hospital Center, Baltimore, MD 21237, USA. jimwelker@hotmail.com

Archives of Internal Medicine

|February 27, 2008

Summary

Reducing the time to first antibiotic dose (TFAD) for community-acquired pneumonia (CAP) from 8 to 4 hours may decrease diagnostic accuracy in emergency departments (EDs). This change did not improve actual TFAD for CAP patients.

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Area of Science:

Emergency Medicine
Infectious Diseases
Quality Improvement

Background:

Community-acquired pneumonia (CAP) diagnosis and treatment are critical in emergency departments (EDs).
A core quality measure mandates a time to first antibiotic dose (TFAD) of less than 4 hours for CAP patients.
Concerns exist that this time pressure may negatively impact diagnostic accuracy.

Purpose of the Study:

To evaluate the effect of a reduced TFAD quality measure on the accuracy of CAP diagnosis by ED physicians.
To compare diagnostic accuracy between a period with an 8-hour TFAD benchmark and a period with a 4-hour TFAD benchmark.

Main Methods:

Retrospective review of adult CAP admissions across two distinct time periods.
Group 1: TFAD benchmark of less than 8 hours.
Group 2: TFAD benchmark reduced to less than 4 hours.
Analysis of CAP diagnostic accuracy by ED physicians at admission and discharge.

Main Results:

Patients in the 4-hour TFAD group (Group 2) were significantly less likely to meet CAP diagnostic criteria upon admission compared to the 8-hour group (Group 1).
Agreement between ED physician diagnosis and predefined CAP criteria decreased in Group 2 (53.9%) versus Group 1 (62.0%) at discharge.
Agreement between admitting and discharging physician diagnoses also showed a trend of decrease in Group 2 (66.9%) versus Group 1 (74.5%).
Mean TFAD was similar between Group 1 (167.0 min) and Group 2 (157.8 min).

Conclusions:

Reducing the mandated TFAD for CAP from 8 to 4 hours appears to compromise the accuracy of pneumonia diagnosis by ED physicians.
The stricter TFAD measure did not lead to a reduction in the actual time to antibiotic administration.
Quality measures should balance timely treatment with diagnostic precision in emergency care settings.