Model of Lazar et al Using the Tracheoesophageal Displacement Index (TDI) for Predicting Complicated Airway at Birth for a Fetus with a Neck Mass

 

Parameters:

(1) volume of amniotic fluid

(2) diagnosis of neck mass

(3) tracehoesophageal displacement index (TEDI), which correlates with the largest diameter of the neck mass

 

The tracheoesophageal displacment is based on measurements in an MRI cross-section of the neck. The location of the tracheoesophageal complex (TEC) is described relative to the ventral edge of the vertebral body.

 

TEDI =

= (lateral displacement of the TEC in mm) + (ventral displacement of the TEC from anterior edge of vertebral body in mm)

Parameter	Finding	Points
volume of amniotic fluid	not polyhydramnios	0
	polyhydramnios	1
diagnosis	not teratoma	0
	teratoma	1
TDI	<= 12	0
	> 12	1

 

score =

= SUM(points for all 3 parameters)

 

Interpretation:

• minimum score: 0

• maximum score: 3

• A score >= 1 was predictive of a complicated airway at birth.