Retrieving microcatheters from Onyx casts in a series of brain arteriovenous malformations: a technical report.
BACKGROUND
To date, the "monorail snare technique" for the retrieval of entombed microcatheter tips during Onyx(TM) (ev3, Irvine, CA) embolisation of brain arteriovenous malformations (BAVM) has not been described. We report our experiences and some technical aspects in using this technique for the retrieval of entombed Marathon(TM) microcatheter (ev3, Plymouth, MN) tips during Onyx embolisation of BAVM treatment.


METHODS
Onyx was used in the embolisation of 11 patients using 25 feeders over 14 sessions. The 'monorail snare technique' was employed for 14 feeders. Each time, an Amplatz 4 mm Gooseneck Microsnare(TM) (ev3, Plymouth, MN) was loaded into an Excelsior 1018(TM) microcatheter (Boston Scientific, Natick, MA). The Marathon microcatheter was cut just distal to the hub, and the Amplatz/Excelsior combination was introduced along the length of the Marathon microcatheter towards its distal end, as far as possible. The embedded catheter was ensnared and both catheters were pulled free.


RESULTS
Microcatheter tip removal was successful in all cases, except for one microcatheter tip becoming detached and needing no further intervention. There were no complications as a direct result of the snare technique.


CONCLUSIONS
The monorail snare technique is a safe and easy technique for retrieving Onyx-encased microcatheter tips in the treatment of BAVM.
St. George`s University of London, London, UK.
A
A
Alamri
A
A
Hyodo
K
K
Suzuki
Y
Y
Tanaka
T
T
Uchida
I
I
Takano
K
K
Kowata
K
K
Iwatate
R
R
Suzuki
D000328:Adult; D000368:Aged; D057785:Catheters; D020878:Device Removal / Q000379:methods*; D004621:Embolization, Therapeutic / Q000295:instrumentation*; D005260:Female; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D055815:Young Adult