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Clinical Indicators of Radiographic Findings in Patients With Suspected Community-Acquired Pneumonia

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
 
ClinicalTrials.gov Identifier: NCT00118651
Recruitment Status : Completed
First Posted : July 12, 2005
Last Update Posted : April 17, 2020
Sponsor:
Information provided by (Responsible Party):
David Grant U.S. Air Force Medical Center

Brief Summary:
This is a study involving the emergency department and outpatient clinics of the David Grant United States Air Force (USAF) Medical Center, a tertiary care facility. Patients 18 years of age or older with acute respiratory symptoms and positive or equivocal chest radiographs from October 1, 2004 through May 31, 2005 will be included as positive cases. Controls will be randomly selected from a review of negative chest radiograph reports with a clinical history of an acute respiratory illness over the same time period. Once patients are appropriately identified as control or cases, outpatient charts will be reviewed to gather data on six clinical indicators. Sensitivities and specificities will be calculated for each clinical indicator, to determine which patients require chest radiographs in the setting of suspected community acquired pneumonia (CAP)

Condition or disease
Pneumonia

Detailed Description:

This was a retrospective study designed to evaluate the efficacy of six clinical indicators to predict the presence of pulmonary infiltrates on chest radiography.

The study population will include a convenience sample of David Grant Air Force Medical Center patients that meet study criteria. Adult patients (18 years of age or older) with acute respiratory symptoms and positive chest radiographs from October 2004 through April 2005 will be enrolled as positive cases. There will be an equal number of controls with acute respiratory symptoms but negative radiographs. Controls will be matched by age and date of radiograph. Patients/Cases with suspected hospital-acquired (positive radiographs within 10 days of hospital discharge) or aspiration pneumonia will be excluded

Six clinical indicators were selected based on the cumulative results of seminal studies that included: cough, sputum production, temperature, heart rate, respiratory rate, and findings on physical examination. Abnormal vital signs were defined as temperature of 100.5 degrees Fahrenheit (38 degrees Celsius) or greater, heart rate greater than or equal to 100 beats per minute, and respiratory rate greater than 20 breaths per minute. Positive physical examination findings consisted of the presence of crackles, decreased breath sounds, dullness to percussion, egophony, or rhonchi

Outpatient emergency room physicians will record data regarding the clinical indicators prior to obtaining chest radiographs; thus, they will be blinded to the radiographic findings. All chests radiographs will be subsequently interpreted by a board-certified radiologist blinded to the clinical findings. Positive radiographic findings will be defined as the presence of a new air space opacities in the setting of acute respiratory symptoms. Patients with equivocal radiographic findings interpreted as "possible pneumonia" will be considered positive cases. For each positive case, a single control was randomly selected from a list of eligible controls with acute respiratory symptoms, negative chest radiographs, and a date of birth within five years of that of the positive case.

Once patients are appropriately identified as cases or controls, outpatient charts will be reviewed to gather data regarding the six clinical indicators will be entered into the study database for analysis upon completion of the study. The sample size necessary to predict the proportion of patients with CAP who have all six clinical indicators was calculated as 385, assuming 95% confidence level and a 5% margin of error. Sample size estimates assume a random sample, which is not possible for us to obtain in this study; any conclusion that we draw will thus e cautiously interpreted. We will conduct this study for a minimum of one year with the intent to continue until a sample size of at least 385 is obtained. Upon completion of the study sensitivities and specificities and accompanying 95% confidence intervals for clinical indicators will be made to determine which combination of indicators best predicts the presence of pulmonary infiltrates in patients with CAP. Further analysis will be made within specific age groups (e.g., 18-40, 41-60, older than 60) and amongst those patients with pre-existing pulmonary disease

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Study Type : Observational
Actual Enrollment : 350 participants
Observational Model: Case-Control
Time Perspective: Prospective
Official Title: Clinical Indicators of Radiographic Findings in Patients With Suspected Community-Acquired Pneumonia: Who Needs a Chest X-Ray?
Actual Study Start Date : October 2004
Actual Primary Completion Date : April 2005
Actual Study Completion Date : April 2005

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Pneumonia X-Rays

Group/Cohort
Positive cases
Positive radiographic findings were defined as the presence of a new air space opacities in the setting of acute respiratory symptoms. Patients with equivocal radiographic findings interpreted as "possible pneumonia" were considered positive cases
Control
Acute respiratory symptoms, negative chest radiographs, and a date of birth within five years of that of the positive case




Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
All adult patients (18 years of age or older) with acute respiratory symptoms and positive chest radiographs from October 2004 through April 2005 were enrolled as positive cases with an equal number of controls with acute respiratory symptoms but negative radiographs; controls were matched by age and date of radiograph
Criteria

Inclusion Criteria:

  • 18 years of age or older
  • acute respiratory symptoms
  • positive chest radiographs
  • patients from outpatient clinics and the emergency department

Exclusion Criteria:

  • under the age of 18
  • suspected hospital-acquired pneumonia (positive radiographs within 10 days of hospital discharge)
  • suspected aspiration pneumonia

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00118651


Locations
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United States, California
David Grant USAF Medical Center
Travis Air Force Base, California, United States, 94535
Sponsors and Collaborators
David Grant U.S. Air Force Medical Center
Investigators
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Principal Investigator: William T. O'Brien, D.O. David Grant USAF Medical Center
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Responsible Party: David Grant U.S. Air Force Medical Center
ClinicalTrials.gov Identifier: NCT00118651    
Other Study ID Numbers: FDG20040023H
First Posted: July 12, 2005    Key Record Dates
Last Update Posted: April 17, 2020
Last Verified: April 2020
Keywords provided by David Grant U.S. Air Force Medical Center:
pneumonia
chest x-ray
respiratory infection
prediction rule
thoracic imaging
Additional relevant MeSH terms:
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Pneumonia
Lung Diseases
Respiratory Tract Diseases
Respiratory Tract Infections