Intraoperative angiography during microsurgical removal of arteriovenous malformations in children. 2010

Michael J Ellis, and Abhaya V Kulkarni, and James M Drake, and James T Rutka, and Derek Armstrong, and Peter B Dirks
Division of Neurosurgery, Hospital for Sick Children, University of Toronto, Ontario, Canada.

OBJECTIVE Confirming the successful management of pediatric arteriovenous malformations (AVMs) requires high-quality postoperative digital subtraction angiography. Although the role of intraoperative angiography during the microsurgical removal of AVMs is well established in adults, the technique has several limitations including poor image quality, uniplanar image acquisition, and absent full heparin protection. Here, the authors report on their experience with high-quality intraoperative angiography during the surgical management of pediatric AVMs in their image-guided therapy (IGT) facility. METHODS The authors retrospectively reviewed the demographic, clinical, and radiological characteristics of 22 patients who underwent the surgical management of AVMs at the Hospital for Sick Children in Toronto, with the aid of high-quality intraoperative or immediate postresection cerebral angiography via a transfemoral approach. RESULTS Between January 2000 and August 2009, 18 children (mean age 13.05 ± 4.04 years, range 4-21 years) underwent both surgical management of an AVM and intraoperative cerebral angiography at an IGT facility. An additional 4 children underwent angiography immediately after surgery in the regular operating room while under the same anesthesia. The mean AVM size was 2.55 ± 1.43 cm (range 1-6 cm) with a mean Spetzler-Martin grade of 2.27 (range 1-4). Intraoperative angiography in 4 of the 18 patients demonstrated residual AVM requiring additional resection. One patient demonstrated residual AVM on immediate postoperative angiography and underwent immediate reoperation. Successful excision of the residual AVM was confirmed on angiography the following day in that case. Procedural complications occurred in connection with 1 (3.3%) of 30 angiograms, including asymptomatic transient nonfilling of an ophthalmic artery, which was resolved on follow-up angiography. Negative intraoperative angiograms were confirmed with follow-up angiograms in 15 (93.75%) of 16 patients at a mean of 9.93 ± 5.70 months. One patient with a negative intraoperative angiogram demonstrated a tiny residual AVM on follow-up angiography at 8 months (false-negative rate 6.25%), but had a negative preoperative angiogram 1 year later in the IGT facility. No patient with a negative intraoperative angiogram required further AVM-directed treatment. CONCLUSIONS Intraoperative angiography is a safe and effective adjunct to the surgical management of AVMs in children. This novel approach allows the pre-, intra-, and postoperative acquisition of high-quality images, which can help guide the resection of AVMs, especially those that are small, diffuse, or of a complex angioarchitecture.

UI MeSH Term Description Entries
D007430 Intraoperative Care Patient care procedures performed during the operation that are ancillary to the actual surgery. It includes monitoring, fluid therapy, medication, transfusion, anesthesia, radiography, and laboratory tests. Care, Intraoperative
D008297 Male Males
D008866 Microsurgery The performance of surgical procedures with the aid of a microscope.
D009873 Operating Rooms Facilities equipped for performing surgery. Operating Room,Room, Operating,Rooms, Operating
D011183 Postoperative Complications Pathologic processes that affect patients after a surgical procedure. They may or may not be related to the disease for which the surgery was done, and they may or may not be direct results of the surgery. Complication, Postoperative,Complications, Postoperative,Postoperative Complication
D002533 Cerebral Angiography Radiography of the vascular system of the brain after injection of a contrast medium. Angiography, Cerebral,Angiographies, Cerebral,Cerebral Angiographies
D002538 Intracranial Arteriovenous Malformations Congenital vascular anomalies in the brain characterized by direct communication between an artery and a vein without passing through the CAPILLARIES. The locations and size of the shunts determine the symptoms including HEADACHES; SEIZURES; STROKE; INTRACRANIAL HEMORRHAGES; mass effect; and vascular steal effect. Arteriovenous Malformations, Cerebral,Intracranial Arteriovenous Malformations, Congenital,AVM (Arteriovenous Malformation) Intracranial,Cerebral Arteriovenous Malformations,Congenital Intracranial Arteriovenous Malformations,Intracranial Arteriovenous Malformation, Ruptured,Ruptured Intracranial Arteriovenous Malformation,Arteriovenous Malformation, Cerebral,Arteriovenous Malformation, Intracranial,Arteriovenous Malformations, Intracranial,Cerebral Arteriovenous Malformation,Intracranial Arteriovenous Malformation,Malformation, Cerebral Arteriovenous,Malformation, Intracranial Arteriovenous,Malformations, Cerebral Arteriovenous,Malformations, Intracranial Arteriovenous
D002648 Child A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL. Children
D002675 Child, Preschool A child between the ages of 2 and 5. Children, Preschool,Preschool Child,Preschool Children
D005188 False Negative Reactions Negative test results in subjects who possess the attribute for which the test is conducted. The labeling of diseased persons as healthy when screening in the detection of disease. (Last, A Dictionary of Epidemiology, 2d ed) False Negative Reaction,Reaction, False Negative,Reactions, False Negative

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