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. 2014 May;55(5):435-41.

Intra- and inter-observer reliability of combined segmental measurement techniques for predicting immediate post-deployment intraluminal tracheal stent length in dogs

Thomas A Monaco  1 , Jim A Taylor  1 , Anke Langenbach  1 , Sebastian Gordon  1 , Eric Vance  1
Affiliations

Intra- and inter-observer reliability of combined segmental measurement techniques for predicting immediate post-deployment intraluminal tracheal stent length in dogs

Thomas A Monaco et al. Can Vet J. 2014 May.

Abstract
in English, French

This study evaluated segmental measurement techniques for predicting immediate post-deployment intraluminal tracheal stent length in dogs with naturally occurring tracheal collapse. Radiographs of 12 client-owned dogs that underwent intraluminal tracheal stent placement were retrospectively reviewed. Tracheal lengths were divided into 1, 2, 3, or 4 equal segments. Stent lengths were predicted using the widest dorsoventral height of each segment, with and without the addition of 10%, and an accompanying foreshortening chart. Techniques were compared for intra- and inter-observer reliability, and post-deployment stent length predictability. There was good to high intra- and inter-observer reliability for all segmental measurements; median intra-class correlation coefficients were 0.98 and 0.92, respectively. Measuring 2 segments without the addition of 10% to the widths was significantly more accurate in predicting immediate post-deployment stent length in terms of percent (P = 0.03) and absolute difference (P = 0.02). Segmental measuring techniques are repeatable amongst observers and may help guide stent selection.

Fiabilité intra-observateur et inter-observateur des techniques de mesure de segments combinées pour la prédiction de la longueur d’une endoprothèse trachéale intraluminale immédiatement après le déploiement chez les chiens. Cette a étude a évalué les techniques de mesure de segments pour prédire la longueur des endoprothèses trachéales intraluminales immédiatement après le déploiement chez les chiens avec un collapse trachéal naturel. Des radiographies de 12 chiens, appartenant à des propriétaires, qui avaient subi le placement d’une endoprothèse trachéale intraluminale ont été examinées rétrospectivement. Les longueurs trachéales ont été divisées en 1, 2, 3, ou 4 segments égaux. Les longueurs d’endoprothèses ont été prédites en utilisant la hauteur dorsoventrale la plus large de chaque segment, avec et sans l’ajout de 10 % et le tableau d’effet de raccourcissement connexe. Les techniques ont été comparées pour la fiabilité intra-observateur et inter-observateur et la prédictibilité de la longueur de l’endoprothèse après le déploiement. Il y avait une fiabilité intra-observateur et inter-observateur de bonne à élevée pour toutes les mesures de segments; les coefficients moyens de corrélation entre les classes étaient de 0,98 et de 0,92, respectivement. La mesure de 2 segments sans l’ajout de 10 % aux largeurs était significativement plus exacte pour la prédiction de la longueur de l’endoprothèse immédiatement après le déploiement en termes de pourcentage (P = 0,03) et de différence absolue (P = 0,02). Les techniques de mesures de segments peuvent être répétées parmi les observateurs et peuvent aider à guider le choix de l’endoprothèse.(Traduit par Isabelle Vallières).

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Figures

Figure 1
Figure 1
Right lateral thorax and caudal cervical radiograph of a patient under general anesthesia for pre-operative tracheal stent measurement showing the correct position of the inflated endotracheal tube cuff just caudal to the mineralized cricoid cartilage (black arrow). The position of the carina is depicted by the white arrow.
Figure 2
Figure 2
The same radiograph as Figure 1, with the addition of an esophageal marker catheter and held positive pressure breath of 20 cm H2O, depicting how the measurements were taken on the ventral aspect of the trachea in 2-cm increments, beginning and ending 1 cm from the cranial (cricoid) and caudal (carina) extents of the trachea. In this radiograph the total tracheal length (TTL) is 143 mm and the working length (WL) is 123 mm. Note the gas in the cranial esophagus correlates the caudal aspect of the cricoid cartilage.
Figure 3
Figure 3
Right lateral thorax and cervical radiograph depicting the measurement technique used for post-deployment tracheal stent length on the ventral aspect of the stent in 2-cm increments. This stent measurement was 100 mm.
See this image and copyright information in PMC

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