Video Esophagram Test for Esophageal Phase Evaluation
The video esophagram test used to assess the esophageal phase of swallowing is called a videofluoroscopic esophagram or biphasic esophagram, which combines dynamic video fluoroscopy with static imaging to evaluate both structural and functional abnormalities of the esophagus 1.
Key Terminology and Test Distinctions
It's critical to distinguish between tests that evaluate different phases of swallowing:
Modified Barium Swallow (MBS): This is a videofluoroscopic procedure that focuses on the oral cavity, pharynx, and cervical esophagus to assess the oral and pharyngeal phases of swallowing—not the esophageal phase 1. It's performed with a speech therapist to evaluate oropharyngeal swallow function and aspiration risk.
Biphasic Esophagram: This is the preferred test for evaluating the thoracic esophagus and esophageal phase of swallowing. It combines both double-contrast views (for mucosal detail) and single-contrast views (for functional assessment and distention) 1.
Videofluoroscopic Esophagram: When dynamic video recording is used during the esophagram, it allows real-time assessment of esophageal motility, transit, and clearance 2, 3.
Clinical Application
For retrosternal dysphagia (esophageal phase problems), the biphasic esophagram is the preferable initial imaging procedure because it can detect:
- Structural abnormalities: Strictures, rings, tumors, esophagitis (96% sensitivity for esophageal cancer) 1
- Functional abnormalities: Motility disorders, gastroesophageal reflux, dysmotility (80-89% sensitivity compared to manometry) 1
Important Clinical Pitfall
A common mistake is ordering only a modified barium swallow when esophageal pathology is suspected. The MBS does not routinely evaluate the thoracic esophagus or gastric cardia 1. Research shows that 26-31% of patients with dysphagia have esophageal phase abnormalities, and in some cases, esophageal pathology is the only finding 2, 4. Additionally, 85% of patients with unremarkable MBS or esophagram findings had abnormalities detected on the corresponding complementary study 5.
Alternative Modalities
Tc-99m scintigraphy can also assess esophageal transit using radiolabeled substances in various consistencies, useful for evaluating motility abnormalities or gastroesophageal reflux 1. However, this lacks the anatomic detail of fluoroscopic studies.
Practical Recommendation
When esophageal phase dysfunction is suspected (retrosternal dysphagia, food sticking in the chest), order a biphasic esophagram with videofluoroscopy rather than just a modified barium swallow. If both oropharyngeal and esophageal phases need evaluation, consider concurrent MBS and esophagram, as they provide complementary diagnostic information 1, 5.