Neurointerventional Research between 2003 and 2012: Slow Growth, High Interdisciplinary Collaboration, and a Low Level of Funding

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Fig 1.
Annual amount of neurointerventional research between 2003 and 2012.

Table 1:

Characteristics of neurointerventional research between 2003 and 2012^{^a}

	Department of the First Author
	Neurosurgery (n = 910)	Radiology (n = 747)	Neurology (n = 270)	Miscellaneous (n = 196)	Total (n = 2123)
Document type
Original article	436 (47.9)	429 (57.4)^{^b}	140 (51.9)	102 (52.1)	1107 (52.1)
Case report	360 (39.6)^{^c}	236 (31.6)	93 (34.4)	73 (37.2)	762 (35.9)
Review	59 (6.5)	49 (6.6)	35 (13.0)^{^d}	19 (9.7)	162 (7.6)
Technical note	55 (6.0)^{^e}	33 (4.4)	2 (0.7)	2 (1.0)	92 (4.4)
Journal
Neuroscience journal	636 (69.9)^{^f}	245 (32.8)	176 (65.2)^{^f}	49 (25.0)	1106 (52.1)
Radiology journal	194 (21.3)	432 (57.8)^{^g}	48 (17.8)	29 (14.8)	703 (33.1)
Other or multidisciplinary journal	80 (8.8)	70 (9.4)	46 (17.0)	118 (60.2)^{^g}	314 (14.8)
Topic
Endovascular treatment of aneurysm	481 (52.9)^{^g}	357 (47.8)	39 (14.4)	64 (32.7)	941 (44.3)
Stent or angioplasty for vascular stenosis	120 (13.2)	111 (14.9)	72 (26.7)^{^d}	59 (30.1)^{^d}	362 (17.1)
Endovascular treatment of AVM or AVF	174 (19.2)^{^e}	145 (19.4)^{^e}	13 (4.8)	23 (11.6)	355 (16.7)
Thrombolysis or thrombectomy	65 (7.1)	93 (12.4)	131 (48.5)^{^g}	26 (13.3)	315 (14.8)
Vasospasm	23 (2.5)	15 (2.0)	3 (1.1)	7 (3.6)	48 (2.3)
Tumor embolization	23 (2.5)	6 (0.8)	1 (0.4)	2 (1.0)	32 (1.5)
General or miscellaneous	24 (2.6)	20 (2.7)	11 (4.1)	15 (7.7)^{^d}	70 (3.3)
Declared funding
Funded	62 (6.8)	65 (8.7)	41 (15.2)^{^d}	24 (12.2)	192 (9.0)
Not funded	848 (93.2)	682 (91.3)	229 (84.8)	172 (87.8)	1931 (91.0)

↵a Numbers in parentheses are percentages.
↵b Significantly different from the value for neurosurgery.
↵c Significantly different from the value for radiology.
↵d Significantly different from the values for departments of neurosurgery and radiology.
↵e Significantly different from the values for departments of neurology and miscellaneous.
↵f Significantly different from the values for departments of radiology and miscellaneous.
↵g Significantly different from the values for all other departments.

Table 2:

Top 20 journals with the highest amount of neurointerventional research between 2003 and 2012

Rank	Journal	Mean Journal IF^{^a}	No. of Articles
1	American Journal of Neuroradiology	2.778	233
2	Interventional Neuroradiology	0.341	173
3	Neurosurgery	2.802	165
4	Neuroradiology	2.064	109
5	Journal of Neurosurgery	2.511	104
6	Stroke	5.971	84
7	Journal of Neurointerventional Surgery	1.123^{^b}	71
8	Surgical Neurology or World Neurosurgery^{^c}	1.195	57
9	Neurologia Medico-Chirurgica (Tokyo)	0.548	43
10	No Shinkei Geka (Japanese)	–	42
11	Acta Neurochirurgica (Wien)	1.323	41
12	Journal of Clinical Neuroscience	0.973	39
13	Journal of Neuroimaging	1.421	31
14	Journal of Korean Neurosurgical Society	0.481^{^d}	28
15	Neurosurgical Focus	2.567^{^b}	27
16	Neurology India	0.696	23
16	Zhonghua Nei Ke Za Zhi (Chinese)	–	23
16	Neurological Research	1.432	23
19	Journal of Vascular and Interventional Radiology	2.133	21
19	Minimally Invasive Neurosurgery	0.731	21

↵a Mean journal Impact Factor between 2003 and 2012.
↵b Mean journal Impact Factor between 2010 and 2012.
↵c Surgical Neurology (2003–2009) is the former name of World Neurosurgery (2010–2012).
↵d Mean journal Impact Factor between 2009 and 2011.

Table 3:

Impact Factor of journals that published neurointerventional research between 2003 and 2012

	Department of the First Author
	Neurosurgery	Radiology	Neurology	Miscellaneous
No. of articles published in SCI(E)-indexed journals	760	688	240	142
No. of SCI(E)-indexed journals	150	59	30	54
Mean journal IF	1.806 ± 1.549	2.103 ± 2.027	3.645 ± 5.259^{^a}	2.245 ± 1.826
25th Percentile Journal IF	0.645	1.069	1.378	1.057
50th Percentile (median) journal IF	1.274	1.990	2.244	2.135
75th Percentile journal IF	2.517	2.629	4.900	2.856

Table 4:

Share of neurointerventional research for 20 top-ranking countries between 2003 and 2012^{^a}

Country	Department of the First Author
Country	Neurosurgery	Radiology	Neurology	Miscellaneous	Total
United States	298	165	120	78	661 (31.1)
Japan	240	24	9	14	287 (13.5)
China^{^b}	121	46	15	2	184 (8.7)
South Korea	90	68	7	5	170 (8.0)
Germany	18	85	24	9	136 (6.4)
France	12	56	10	6	84 (4.0)
Italy	11	28	6	11	56 (2.6)
Canada	12	27	5	8	52 (2.5)
Turkey	8	31	1	7	47 (2.2)
United Kingdom	14	21	4	3	42 (2.0)
Spain	3	18	12	5	38 (1.8)
Taiwan	3	23	6	3	35 (1.6)
The Netherlands	0	30	3	1	34 (1.6)
Switzerland	2	20	10	1	33 (1.6)
India	1	17	2	7	27 (1.3)
Australia	6	10	6	3	25 (1.2)
Brazil	7	12	2	3	24 (1.1)
Poland	7	12	1	4	24 (1.1)
Belgium	5	12	2	2	21 (1.0)
Israel	11	1	4	2	18 (0.8)

↵a Data in parentheses are percentages. Data do not add up to 100% because shares of other countries are not included.
↵b Includes articles originating from Hong Kong.

Table 5:

Collaboration with other disciplines in neurointerventional research between 2003 and 2012^{^a}

Collaboration Type	Department of the First Author
Collaboration Type	Neurosurgery (n = 910)	Radiology (n = 747)	Neurology (n = 270)	Miscellaneous (n = 196)	Total (n = 2123)
Collaboration with other disciplines	376 (41.3)	397 (53.1)	177 (65.6)^{^b}	110 (56.1)	1060 (49.9)
Corresponding author from other disciplines	17 (1.9)	7 (0.9)	10 (3.7)	9 (4.6)	43 (2.0)
1) Coauthors from neurosurgery, radiology, and/or neurology disciplines	264 (29.0)	287 (38.4)	107 (39.6)	65 (33.2)	723 (34.1)
2) Coauthors from other disciplines	57 (6.3)	52 (7.0)	26 (9.6)	25 (12.8)	160 (7.5)
1 + 2	38 (4.2)	51 (6.8)	34 (12.6)	11 (5.6)	134 (6.3)
No collaboration with other disciplines	534 (58.7)	350 (46.9)	93 (34.4)	86 (43.9)	1063 (50.1)