Synopsis
Choose, prepare, perform and interpret dynamic fluoroscopic contrast examinations by matching the contrast route and agent to the clinical question while recognising radiation, aspiration, perforation and reaction risks.
- Fluoroscopy uses pulsed or continuous X-rays to display movement in real time, allowing assessment of swallowing, luminal transit, reflux, leaks, fistulae, tube position and organ motion.
- Start with a precise clinical question: fluoroscopy is strongest when dynamic function or contrast passage matters, while endoscopy, CT, ultrasound or MRI may better assess mucosa, extraluminal disease or cross-sectional anatomy.
- Barium coats mucosa densely and gives good luminal detail but should generally be avoided when perforation is suspected; water-soluble iodinated contrast is used when leakage into tissues is a concern.
Key red flags
Suspected oesophageal or bowel perforation changes the contrast decision; dense barium outside the lumen can persist and cause serious mediastinal or peritoneal contamination.
Severe dysphagia, impaired consciousness or ineffective cough creates an aspiration risk and should prompt a planned swallowing assessment with airway precautions rather than an unmodified routine swallow.
Pregnancy or possible pregnancy requires explicit assessment because fluoroscopy uses ionising radiation, although an urgent justified examination should not be withheld automatically.
Immediate urticaria with airway, breathing or circulatory features after an iodinated agent is a contrast emergency and must be treated by severity rather than waiting for rash progression.
A tract or collection filling beyond the expected postoperative or native lumen supports perforation, fistula or anastomotic leak and requires prompt communication because management depends on site and containment.
Nephrostograms, tubograms and line studies show whether a catheter communicates with the intended cavity or lumen, but resistance to injection, pain or swelling suggests malposition or obstruction and should halt forceful injection.
Investigation priorities
Assess oral and pharyngeal swallowing physiology, airway invasion and response to altered bolus consistency, posture or manoeuvres.
Management branches
A patient develops tachycardia and chest pain after oesophageal surgery, and the surgical team asks whether oral intake can start.
- Clarify the operation, anastomotic site, drains, symptoms and prior imaging, and decide with radiology and surgery whether fluoroscopy, CT with oral contrast or both will best answer the immediate question.
- Because a leak is suspected, select an appropriate water-soluble iodinated agent and position the patient to demonstrate the anastomosis while controlling aspiration risk.