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Simultaneous videofluoroscopic swallow study and modified Evans blue dye procedure: An evaluation of blue dye
S L Brady1, C D Hildner, B F Hutchins
1Marianjoy Rehabilitation Hospital, Wheaton, Illinois 60187, USA.
Abstract:
The reliability of the modified Evans blue dye (MEBD) test for the detection of aspirated materials in patients with tracheostomy has been questioned. The videofluoroscopic swallow study (VFSS) has been the standard procedure used to detect aspiration, but there are known risks and the VFSS is not always an available evaluation option for aspiration detection. The purpose of the present study was to investigate the visualization of blue tracheal secretions in cases of known aspiration as documented by the VFSS. Twenty consecutive simultaneous MEBD study and VFSS were completed on patients with tracheostomies at an acute rehabilitation hospital. Overall, the MEBD showed a 50% false-negative error rate. The MEBD identified aspiration in 100% of patients who aspirated more than trace amounts but failed to identify aspiration of trace amounts (0%).
Insights
The modified Evans blue dye (MEBD) test is unreliable for detecting aspiration in tracheostomy patients, showing a 50% false-negative rate. It misses trace aspiration, a critical limitation for patient safety.
Area of Science:
- Clinical Medicine
- Otolaryngology
- Gastroenterology
Background:
- The modified Evans blue dye (MEBD) test is used to detect aspiration in patients with tracheostomies.
- Its reliability has been questioned, and the videofluoroscopic swallow study (VFSS) is the current standard but has limitations.
Purpose of the Study:
- To evaluate the accuracy of the MEBD test in visualizing blue tracheal secretions.
- To compare MEBD findings with videofluoroscopic swallow study (VFSS) results in patients with tracheostomies.
Main Methods:
- Twenty consecutive patients with tracheostomies underwent simultaneous MEBD and VFSS.
- Aspiration was documented by VFSS, and MEBD was assessed for blue tracheal secretions.
Main Results:
- The MEBD test demonstrated a 50% false-negative error rate.
- It accurately identified aspiration in 100% of patients with significant aspiration.
- However, it failed to detect 100% of trace aspiration events.
Conclusions:
- The MEBD test is unreliable for detecting all levels of aspiration in tracheostomy patients.
- Its inability to detect trace aspiration poses a significant risk and limits its clinical utility.