Hand-held metal detector identification of ingested foreign bodies

Area of Science:

• Pediatric Emergency Medicine
• Medical Device Technology
• Diagnostic Imaging

Background:

• Ingested metallic foreign bodies (MFBs) are a common pediatric emergency.
• Accurate and timely diagnosis is crucial for effective management.
• Radiography is the traditional method for MFB detection, but may not always be necessary.

Purpose of the Study:

• To evaluate the diagnostic accuracy of hand-held metal detectors (HHMDs) for ingested MFBs in children.
• To compare HHMD performance against radiographic findings.
• To determine the utility of HHMDs as a primary screening tool.

Main Methods:

• Prospective enrollment of 23 children presenting with suspected ingested MFBs.
• Use of HHMDs to screen for metallic foreign bodies.
• Confirmation of MFB presence and location using radiographic studies (X-rays).
• Calculation of diagnostic performance metrics: sensitivity, specificity, PPV, NPV.

Main Results:

• 16 out of 23 patients had radiographically confirmed MFBs.
• HHMDs correctly detected 15 of 16 positive MFBs (93.8% sensitivity).
• HHMDs correctly excluded MFBs in 6 of 6 negative cases (100% specificity).
• The only missed MFB was an ingested needle; all other detected MFBs were accurately localized.
• Positive HHMD findings in the stomach or intestines did not require confirmatory radiography.

Conclusions:

• HHMDs are highly sensitive and specific screening devices for ingested MFBs in children.
• HHMDs can effectively reduce the need for confirmatory radiographic studies, particularly for objects in the stomach and lower GI tract.
• This technology offers a potentially faster and more accessible diagnostic approach in emergency settings.