Utility of Thermal Imaging in Diagnosis of Cellulitis for Lower Extremity Complaints in the Emergency Department

Cellulitis Clinical Trial

Official title:

Utility of Thermal Imaging in Diagnosis of Cellulitis for Lower Extremity Complaints in the Emergency Department

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT04928235
• Other study ID #: 2018-0823 Phase 2
• Secondary ID: A534100SMPH/EMER
• Status: Completed
• Start date: July 18, 2021
• Est. completion date: February 18, 2023

Study information

• Verified date: December 2023
• Source: University of Wisconsin, Madison
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

The overall purpose of the study is to determine how providing physicians with a quantitative measure of skin surface temperature influences diagnoses and diagnostic confidence in potential cellulitis cases when added to the standard evaluation.

Description:

Previous literature estimates the emergency department misdiagnosis rate for cellulitis exceeds 30% due to conditions which can mimic cellulitis (termed pseudocellulitis). These diagnostic errors are associated with an estimated $195 to $515 million dollars in avoidable healthcare spending each year. Objective skin surface temperature measurement, obtained via thermal imaging cameras, has been proposed as a diagnostic adjunct that may reduce diagnostic error in cases of suspected cellulitis. One recent study, identified that the maximum affected skin temperature in cellulitis is significantly higher than in pseudocellulitis, and the temperature gradient between affected and unaffected sites in patients with cellulitis is significantly higher than in patients with pseudocellulitis.

The overall purpose of the study is to determine how providing physicians with a quantifiable measure of skin surface temperature information influences diagnoses and diagnostic confidence in potential cellulitis cases when added to standard physical exam techniques

The Aims of the study are to :

Specific Aim 1: To characterize the temperature difference between affected and unaffected limbs in patients with cellulitis in the emergency department.

Specific Aim 2: To characterize the temperature difference between cases of cellulitis and pseudocellulitis

Specific Aim 3: To determine how quantifying temperature gradients changes diagnostic confidence and accuracy when added to the standard diagnostic evaluation for potential cellulitis.

The investigators will prospectively enroll a maximum of 560 patients with non-traumatic lower extremity dermatologic complaints with visible erythema (potential cellulitis) in the University of Wisconsin Emergency Department. A thermal image and a photograph of the affected and the unaffected limbs will be taken.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 416
• Est. completion date: February 18, 2023
• Est. primary completion date: January 18, 2023
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Participant is presenting to the University of Wisconsin Emergency Department

• Participant has an acute skin complaint on the lower extremity

Exclusion Criteria:

• Participant is has limited English and Spanish proficiency

• There was an acute traumatic injury of affected area in last 5 days- includes burns

• Affected area has a confirmed fracture

• Participant is pregnant

• Participant is a prisoner

• Current complaint is in an area of past surgical procedure (within past 4 weeks)

• Participant has implant or hardware at site

• Animal or human bite is cause of complaint

• Temperature of the leg has been altered in the last one hour

• Unable to provide informed consent

Related Conditions & MeSH terms

• Cellulitis
• Emergencies
• Skin and Subcutaneous Tissue Infection

Intervention

Diagnostic Test:
• Thermal Imaging as Diagnostic Adjunct
Thermal images of the participants lower extremities will be taken and skin surface temperature values will be provided to the healthcare provider for review during the emergency department encounter.

Locations

Country	Name	City	State
United States	University of Wisconsin Emergency Department	Madison	Wisconsin

Sponsors (2)

Lead Sponsor	Collaborator
University of Wisconsin, Madison	Agency for Healthcare Research and Quality (AHRQ)

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Skin Temperature Difference Between Affected and Unaffected Legs for Participants with Cellulitis	Differences in skin surface temperatures of affected and unaffected areas for those with a final diagnosis of cellulitis.	up to one hour
Primary	Skin Temperature Difference Between Participants Diagnosed with Pseudocellulitis and Cellulitis	Determine differences in skin surface temperatures between cases of pseudocellulitis and cellulitis (on the affected legs).	up to one hour
Secondary	Change in Diagnostic Confidence as Measured by Physician Self-Report	Comparison of the change in diagnostic confidence as measured by the attending physician response pre/post thermal imaging review. This was a question developed by the study team and response options include not at all confident, slightly confident, somewhat confident, very confident, extremely confident. No number values are assigned to response values as of yet.	up to one hour
Secondary	Diagnostic agreement with expert review panel	Provider cellulitis diagnostic assignment (yes/no) will be compared to an expert panel to determine the rate of concordance.	6 months