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Yasargil aneurysm clips: evaluation of interactions with a 1.5-T MR system. 1998

F G Shellock, and E Kanal
Department of Radiology, University of Southern California, School of Medicine, Los Angeles, USA.

OBJECTIVE To evaluate the magnetic field interactions with Yasargil aneurysm clips exposed to a 1.5-T MR system. METHODS Sixteen Yasargil aneurysm clips made with Phynox (10 clips returned to the manufacturer due to suspected magnetic field interactions and six clips obtained from the manufacturer in sterile packages) were tested for magnetic field interaction at 1.5 T by using techniques to assess magnetic field-induced translational (deflection angle test) and torque (changes in alignment or rotation) forces. RESULTS None of the aneurysm clips demonstrated magnetic field interactions; that is, deflection angles were zero and there were no changes in alignment or evidence of rotational forces present. CONCLUSIONS It is safe to perform MR procedures at 1.5 T or less in patients with Yasargil aneurysm clips made with nonferromagnetic material.

UI MeSH Term Description Entries
D001921 Brain The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM. Encephalon
D002532 Intracranial Aneurysm Abnormal outpouching in the wall of intracranial blood vessels. Most common are the saccular (berry) aneurysms located at branch points in CIRCLE OF WILLIS at the base of the brain. Vessel rupture results in SUBARACHNOID HEMORRHAGE or INTRACRANIAL HEMORRHAGES. Giant aneurysms (>2.5 cm in diameter) may compress adjacent structures, including the OCULOMOTOR NERVE. (From Adams et al., Principles of Neurology, 6th ed, p841) Aneurysm, Cerebral,Aneurysm, Intracranial,Basilar Artery Aneurysm,Berry Aneurysm,Brain Aneurysm,Cerebral Aneurysm,Giant Intracranial Aneurysm,Mycotic Aneurysm, Intracranial,Aneurysm, Anterior Cerebral Artery,Aneurysm, Anterior Communicating Artery,Aneurysm, Basilar Artery,Aneurysm, Middle Cerebral Artery,Aneurysm, Posterior Cerebral Artery,Aneurysm, Posterior Communicating Artery,Anterior Cerebral Artery Aneurysm,Anterior Communicating Artery Aneurysm,Middle Cerebral Artery Aneurysm,Posterior Cerebral Artery Aneurysm,Posterior Communicating Artery Aneurysm,Aneurysm, Berry,Aneurysm, Brain,Aneurysm, Giant Intracranial,Aneurysm, Intracranial Mycotic,Aneurysms, Basilar Artery,Aneurysms, Berry,Aneurysms, Brain,Aneurysms, Cerebral,Aneurysms, Giant Intracranial,Aneurysms, Intracranial,Aneurysms, Intracranial Mycotic,Artery Aneurysm, Basilar,Artery Aneurysms, Basilar,Basilar Artery Aneurysms,Berry Aneurysms,Brain Aneurysms,Cerebral Aneurysms,Giant Intracranial Aneurysms,Intracranial Aneurysm, Giant,Intracranial Aneurysms,Intracranial Aneurysms, Giant,Intracranial Mycotic Aneurysm,Intracranial Mycotic Aneurysms,Mycotic Aneurysms, Intracranial
D002858 Chromium Alloys Specific alloys not less than 85% chromium and nickel or cobalt, with traces of either nickel or cobalt, molybdenum, and other substances. They are used in partial dentures, orthopedic implants, etc. Chromium-Cobalt Alloys,Chromium-Nickel Alloys,Cobalt-Chromium Alloys,Nickel-Chromium Alloys,Alloys, Chromium,Alloys, Chromium-Cobalt,Alloys, Chromium-Nickel,Alloys, Cobalt-Chromium,Alloys, Nickel-Chromium,Chromium Cobalt Alloys,Chromium Nickel Alloys,Cobalt Chromium Alloys,Nickel Chromium Alloys
D003035 Cobalt A trace element that is a component of vitamin B12. It has the atomic symbol Co, atomic number 27, and atomic weight 58.93. It is used in nuclear weapons, alloys, and pigments. Deficiency in animals leads to anemia; its excess in humans can lead to erythrocytosis. Cobalt-59,Cobalt 59
D005290 Ferric Compounds Inorganic or organic compounds containing trivalent iron. Compounds, Ferric
D005547 Foreign Bodies Inanimate objects that become enclosed in the body. Foreign Objects,Gossypiboma,Retained Surgical Instruments,Retained Surgical Items,Retained Surgical Needle,Retained Surgical Sponge,Retained Surgical Tools,Textiloma,Bodies, Foreign,Body, Foreign,Foreign Body,Foreign Object,Gossypibomas,Object, Foreign,Objects, Foreign,Retained Surgical Instrument,Retained Surgical Item,Retained Surgical Needles,Retained Surgical Sponges,Retained Surgical Tool,Surgical Instrument, Retained,Surgical Instruments, Retained,Surgical Item, Retained,Surgical Items, Retained,Surgical Needle, Retained,Surgical Needles, Retained,Surgical Sponge, Retained,Surgical Sponges, Retained,Surgical Tool, Retained,Surgical Tools, Retained,Textilomas
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000075202 Contraindications A condition or factor associated with a recipient that makes the use of a drug, procedure, or physical agent improper or inadvisable. Contraindications may be absolute (life threatening) or relative (higher risk of complications in which benefits may outweigh risks). Contraindications, Physical Agent,Medical Contraindications,Agent Contraindication, Physical,Agent Contraindications, Physical,Contraindication,Contraindication, Medical,Contraindication, Physical Agent,Contraindications, Medical,Medical Contraindication,Physical Agent Contraindication,Physical Agent Contraindications
D000497 Alloys A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions. Alloy
D013525 Surgical Instruments Hand-held tools or implements used by health professionals for the performance of surgical tasks. Clamps, Surgical,Clips, Surgical,Clips, Tantalum,Forceps,Hooks, Surgical,Plugs, Surgical,Scissors, Surgical,Speculum,Surgical Clamps,Surgical Clips,Surgical Hooks,Surgical Plugs,Surgical Scissors,Surgical Valves,Trocar,Valves, Surgical,Clamp, Surgical,Clip, Surgical,Clips,Hook, Surgical,Instrument, Surgical,Plug, Surgical,Surgical Clamp,Surgical Clip,Surgical Hook,Surgical Plug,Surgical Valve,Valve, Surgical,Clip,Clip, Tantalum,Forcep,Instruments, Surgical,Speculums,Surgical Instrument,Tantalum Clip,Tantalum Clips,Trocars

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