|Classification and external resources|
A tracheoesophageal fistula (TEF, or TOF; see spelling differences) is an abnormal connection (fistula) between the esophagus and the trachea. TEF is a common congenital abnormality, but when occurring late in life is usually the sequela of surgical procedures such as a laryngectomy.
A fistula, from the Latin meaning 'a pipe', is an abnormal connection running either between two tubes or between a tube and a surface. In tracheo-esophageal fistula it runs between the trachea and the esophagus. This connection may or may not have a central cavity; if it does, then food within the esophagus may pass into the trachea (and on to the lungs) or alternatively, air in the trachea may cross into the esophagus.
Neonates with TEF or esophageal atresia are unable to feed properly. Once diagnosed, prompt surgery is required to allow the food intake. Some children do experience problems following TEF surgery; they can develop dysphagia and thoracic problems. Children with TEF can also be born with other abnormalities, most commonly those described in VACTERL association - a group of anomalies which often occur together, including heart, kidney and limb deformities. 6% of babies with TEF also have a laryngeal cleft.
Fistulae between the trachea and esophagus in the newborn can be of diverse morphology and anatomical location; however, various pediatric surgical publications have attempted a classification system based on the below specified types.
Not all types include both esophageal agenesis and tracheoesophageal fistula, but the most common types do.
|-||Type 1||Esophageal agenesis. Very rare, and not included in the classification by Gross.||Yes||No|
|Type A||Type 2||Proximal and distal esophageal bud—a normal esophagus with a missing mid-segment.||Yes||No|
|Type B||Type 3A||Proximal esophageal termination on the lower trachea with distal esophageal bud.||Yes||Yes|
|Type C||Type 3B||Proximal esophageal atresia (esophagus continuous with the mouth ending in a blind loop superior to the sternal angle) with a distal esophagus arising from the lower trachea or carina. (Most common, up to 90% of cases.)||Yes||Yes|
|Type D||Type 3C||Proximal esophageal termination on the lower trachea or carina with distal esophagus arising from the carina.||Yes||Yes|
|Type E (or H-Type)||-||A variant of type D: if the two segments of esophagus communicate, this is sometimes termed an H-type fistula due to its resemblance to the letter H. TEF without EA.||No||Yes|
An additional type, "blind upper segment only" has been described, but this type is not usually included in most classifications.
(For the purposes of this discussion, proximal esophagus indicates normal esophageal tissue arising normally from the pharynx, and distal esophagus indicates normal esophageal tissue emptying into the proximal stomach.)
Tracheoesophageal fistula is suggested in a newborn by copious salivation associated with choking, coughing, vomiting, and cyanosis coincident with the onset of feeding. Esophageal atresia and the subsequent inability to swallow typically cause polyhydramnios in utero. Rarely it may present in an adult.
- Stricture, due to gastric acid erosion of the shortened esophagus.
- Leak of contents at the point of anastomosis.
- Recurrence of fistula.
- Increased gastro oesophageal reflux.
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