Summary of 10 technical problems during GDC deployment
| No. | Sex/Age (y) | Aneurysm | Size | H&H | Event(s) | GDC* | Catheter | Management | Clinical Consequence |
|---|---|---|---|---|---|---|---|---|---|
| 1 | F/54 | BA | 8 | 0 | SB, IL | 6th and 7th coil/9, GDC-10, 2 × 6, 2 × 4, S, SR, SG | Rebar14 | Removal of the interlocked coils and the catheter as one unit | Uneventful |
| 2 | F/53 | BA | 6 | 2 | SB | 2nd coil/6, GDC-10, 4 × 8, 2D, S, SR, SG | Excelsior | Reinsertion with subsequent coil | Uneventful |
| 3 | F/48 | ACoA | 3 | 2 | SB | last coil/2, GDC-10, 3 × 6, 2D, S, SR, SG | Rebar14 | Reinsertion with subsequent coil | Uneventful |
| 4 | F/61 | ICA | 10 | 0 | SD, SB | last coil/7, GDC-10, 3 × 6, 2D, S, SR, SG | Excelsior | Heparinization, antiplatelet therapy | Uneventful |
| 5 | M/42 | ACoA | 5 | 4 | SD, UD | last coil/7, GDC-10, 2 × 1, S, SR, SG | Rebar14 | Heparinization, antiplatelet therapy | Uneventful |
| 6 | M/46 | ACoA | 2 | 2 | SD | last coil/2, GDC-10, 2 × 1, US, SR, SG | Excel14 | Coil removal with snare, no further aneurysm treatment | Uneventful |
| 7 | F/52 | ICA | 24 | 0 | SD | 1st coil/1, GDC-18, 18 × 30, 2D, SG | Excelsior | Urgent bypass surgery and subsequent endovascular occlusion of the artery | Uneventful |
| 8 | F/58 | BA | 16 | 4 | SD | 1st coil/16, GDC-10, 8 × 20, 3D, SG | Excelsior | No special management | Uneventful |
| 9 | F/66 | PICA | 3 | 2 | UD | last coil/3, GDC-10, 2 × 2, S, SR, SG | Rebar14 | Heparinization, antiplatelet therapy | Uneventful |
| 10 | F/43 | ACoA | 3 | 4 | UD | last coil/2, GDC-10, 3 × 6, S, SR, SG | Rebar14 | Antiplatelet therapy | Uneventful |
Note.—H&H indicates Hunt and Hess grade of subarachnoid hemorrhage; size, the largest diameter of the aneurysm (mm); BA, basilar top aneurysm; SB, slipping-back of the coil; IL, coil interlocking; S, soft-GDC; SR, stretch-resistant-GDC; SG, synerG-GDC; 2D, 2-diameter GDC; 3D, 3D GDC; ACoA, anterior communicating artery aneurysm; ICA, carotid artery aneurysm; SD, spontaneous detachment; UD, undesirable detachment at the parent artery; PICA, posterior inferior cerebellar artery aneurysm.
* GDC coil(s) directly related to the event(s)/total number of GDCs inserted. Helical diameter (mm) × length (cm).