Small Number of Coils With Extended Length in the Endovascular Treatment of Cerebral Aneurysm: Experience of 108 Cases in a Single-Center

Background: Knowledge about the number and packing density of coils for aneurysm treatment affects the efficiency of health services and hospital financing. This study­­ aimed to report case series with a small number of coils with longer lengths and impact on packing density. Methods: We retrospectively analyzed the morphology of aneurysms (location and size) and the data of characteristic features of coils (numbers, diameter size, length, and packing density) from the cerebral aneurysm registry at a single center from January 2019 to June 2022. Kruskal-Wallis analysis was performed to identify the association between coil characteristics based on the size of the aneurysm. Results: Of the 108 patients included in the study, 116 aneurysms were identified and coiled; 66 were small (< 5 mm), 42 were moderate (5 - 10 mm), and eight were large (> 10 mm). Most cases utilized framing first coil (in 64.65%) and helical coils (in 31.89%). The total length of framing coils (< 5 mm: 6.76 ± 4.14 cm, 5 - 10 mm: 11.28 ± 6.93 cm, > 10 mm: 29.33 ± 12.59 cm) and helical coils (< 5 mm: 5.95 ± 2.82 cm, 5 - 10 mm: 11.66 ± 7.3 cm, > 10 mm: 22.32 ± 11.48 cm) also increased with group size. The highest packing density (46.70%) was achieved in small aneurysms (< 5 mm). Conclusion: In small aneurysm, one to three coils per aneurysm were required to achieve tight coil packing density by extending the length of coil. J Neurol Res. 2024;14(1):1-7 doi: https://doi.org/10.14740/jnr777