Evaluation of contrast media for bronchography.
BACKGROUND
Bronchography is occasionally needed for the evaluation and management of some congenital pulmonary anomalies as well as some acquired diseases, usually of the tracheo- bronchial tree. There is currently no effective, approved contrast agent for this imaging techniq ue.


OBJECTIVE
We evaluated five agents (barium sulfate, iohexol, propyliodone oily, propyliodone aqueous, and perflubron) in terms of image quality, histologic changes, and effects on hemodynamics, blood gases, and standard laboratory tests in New Zealand White rabbits.


METHODS
Animals were anesthetized and intubated. Each contrast agent (0.25 ml/kg) was administered intratracheally. Three animals in each group had intravenous lines placed for blood sampling and blood pressure monitoring and were sacrificed at 1 h. An additional three animals for each agent were sacrificed at 24 h and 1 week after imaging. Blood samples were taken immediately before contrast instillation and at 1 h postbronchography. Fluoroscopic images were recorded on standard VHS video tape and evaluated in blind fashion. Segments of lung tissue and bronchi were obtained for histologic examination.


RESULTS
Necrosis and/or inflammatory infiltrates were noted in 78 % of the bronchograms performed with propyliodone aqueous, 67 % with propyliodone oily, 55 % with perflubron, and 33 % with iohexol 120, 240 and 350. No histologic damage was observed with barium. The propyliodones gave the best-quality imaging results and the most histologic changes. Iohexol, in any concentration, gave the least acceptable images and a moderate number of histologic changes. Barium sulfate demonstrated acceptable images with virtually no histologic changes.


CONCLUSIONS
From the histologic and imaging results, barium is the best available contrast material for bronchography.
Thompson
I M
IM
Department of Surgery, Children's Hospital of Michigan and Wayne State University, Detroit, Michigan, USA.
Whittlesey
G C
GC
Slovis
T L
TL
Chang
C H
CH
Cullen
M L
ML
Philippart
A I
AI
Stockmann
P S
PS
Adkins
E S
ES
Klein
M D
MD
D000818:Animals; D001466:Barium Sulfate / Q000633:toxicity; D001980:Bronchi / Q000187:drug effects / Q000473:pathology; D001995:Bronchography; D003287:Contrast Media / Q000633:toxicity; D004341:Drug Evaluation; D005466:Fluorocarbons / Q000633:toxicity; D006842:Hydrocarbons, Brominated; D007472:Iohexol / Q000633:toxicity; D008168:Lung / Q000187:drug effects / Q000473:pathology; D011440:Propyliodone / Q000633:toxicity; D011817:Rabbits
D003287:Contrast Media; D005466:Fluorocarbons; D006842:Hydrocarbons, Brominated; D001466:Barium Sulfate; D007472:Iohexol; D011440:Propyliodone; C003072:perflubron