Academic impact and rankings of neuroendovascular fellowship programs across the United States

View More View Less
  • 1 Departments of Neurosurgery and
  • | 2 Radiology, Jacobs School of Medicine and Biomedical Sciences, and
  • | 3 Toshiba Stroke and Vascular Research Center, University at Buffalo, State University of New York;
  • | 4 Department of Neurosurgery, Gates Vascular Institute at Kaleida Health; and
  • | 5 Jacobs Institute, Buffalo, New York
Restricted access

Purchase Now

USD  $45.00

JNS + Pediatrics - 1 year subscription bundle (Individuals Only)

USD  $515.00

JNS + Pediatrics + Spine - 1 year subscription bundle (Individuals Only)

USD  $612.00
Print or Print + Online


Publication has become a major criterion of success in the competitive academic environment of neurosurgery. This is the first study that has used departmental h index–and e index–based matrices to assess the academic output of neuroendovascular, neurointerventional, and interventional radiology fellowship programs across the continental US.


Fellowship program listings were identified from academic and organization websites. Details for 37 programs were available. Bibliometric data for these programs were gathered from the Thomson Reuters Web of Science database. Citations for each publication from the fellowship's parent department were screened, and the h and e indices were calculated from non–open-surgical, central nervous system vascular publications. Variables including “high-productivity” centers, fellowship–comprehensive stroke center affiliation, fellowship accreditation status, neuroendovascular h index, e index (h index supplement), h10 index (publications during the last 10 years), and departmental faculty-based h indices were created and analyzed.


A positive correlation was seen between the neuroendovascular fellowship h index and corresponding h10 index (R = 0.885; p < 0.0001). The mean, median, and highest faculty-based h indices exhibited positive correlations with the neuroendovascular fellowship h index (R = 0.662, p < 0.0001; R = 0.617, p < 0.0001; and R = 0.649, p < 0.0001, respectively). There was no significant difference (p = 0.824) in the median values for the fellowship h index based on comprehensive stroke center affiliation (30 of 37 programs had such affiliations) or accreditation (18 of 37 programs had accreditation) (p = 0.223). Based on the quartile analysis of the fellowship h index, 10 of 37 departments had an neuroendovascular h index of ≥ 54 (“high-productivity” centers); these centers had significantly more faculty (p = 0.013) and a significantly higher mean faculty h index (p = 0.0001).


The departmental h index and analysis of its publication topics can be used to calculate the h index of an associated subspecialty. The analysis was focused on the neuroendovascular specialty, and this methodology can be extended to other neurosurgical subspecialties. Individual faculty research interest is directly reflected in the research productivity of a department. High-productivity centers had significantly more faculty with significantly higher individual h indices. The current systems for neuroendovascular fellowship program accreditation do not have a meaningful impact on academic productivity.


ACGME = Accreditation Council for Graduate Medical Education; CAST = Committee on Advanced Subspecialty Training; DNV = Det Norske Veritas; h10 index = h index for publications in the last 10 years; h index-dept = departmental h index; h index-neuroendovascular = h index for the neuroendovascular fellowship; JC = Joint Commission; UCLA = University of California, Los Angeles; UCSF = University of California, San Francisco.

Supplementary Materials

    • Appendices 1 and 2 (PDF 678 KB)
  • 1

    Berkhemer OA, Fransen PS, Beumer D, van den Berg LA, Lingsma HF, Yoo AJ, et al.: A randomized trial of intraarterial treatment for acute ischemic stroke. N Engl J Med 372:1120, 2015

    • Search Google Scholar
    • Export Citation
  • 2

    Campbell BC, Mitchell PJ, Kleinig TJ, Dewey HM, Churilov L, Yassi N, et al.: Endovascular therapy for ischemic stroke with perfusion-imaging selection. N Engl J Med 372:10091018, 2015

    • Search Google Scholar
    • Export Citation
  • 3

    Egghe L: Theory and practice of the g-index. Scientometrics 69:131152, 2006

  • 4

    Fiorella D, Hirsch JA, Woo HH, Rasmussen PA, Shazam Hussain M, Hui FK, et al.: Should neurointerventional fellowship training be suspended indefinitely?. J Neurointerv Surg 4:315318, 2012

    • Search Google Scholar
    • Export Citation
  • 5

    Goyal M, Demchuk AM, Menon BK, Eesa M, Rempel JL, Thornton J, et al.: Randomized assessment of rapid endovascular treatment of ischemic stroke. N Engl J Med 372:10191030, 2015

    • Search Google Scholar
    • Export Citation
  • 6

    Hirsch JE: An index to quantify an individual's scientific research output. Proc Natl Acad Sci U S A 102:1656916572, 2005

  • 7

    Jovin TG, Chamorro A, Cobo E, de Miquel MA, Molina CA, Rovira A, et al.: Thrombectomy within 8 hours after symptom onset in ischemic stroke. N Engl J Med 372:22962306, 2015

    • Search Google Scholar
    • Export Citation
  • 8

    Khan NR, Thompson CJ, Taylor DR, Venable GT, Wham RM, Michael LM II, et al.: An analysis of publication productivity for 1225 academic neurosurgeons and 99 departments in the United States. J Neurosurg 120:746755, 2014

    • Search Google Scholar
    • Export Citation
  • 9

    Klimo P Jr, Venable GT, Khan NR, Taylor DR, Shepherd BA, Thompson CJ, et al.: Bibliometric evaluation of pediatric neurosurgery in North America. J Neurosurg Pediatr 14:695703, 2014

    • Search Google Scholar
    • Export Citation
  • 10

    Ponce FA, Lozano AM: Academic impact and rankings of American and Canadian neurosurgical departments as assessed using the h index. J Neurosurg 113:447457, 2010

    • Search Google Scholar
    • Export Citation
  • 11

    Sonig A, Lin N, Krishna C, Natarajan SK, Mokin M, Hopkins LN, et al.: Impact of transfer status on hospitalization cost and discharge disposition for acute ischemic stroke across the US. J Neurosurg 124:12281237, 2016

    • Search Google Scholar
    • Export Citation
  • 12

    Spearman CM, Quigley MJ, Quigley MR, Wilberger JE: Survey of the h index for all of academic neurosurgery: another power-law phenomenon?. J Neurosurg 113:929933, 2010

    • Search Google Scholar
    • Export Citation
  • 13

    Zhang CT: The e-index, complementing the h-index for excess citations. PLoS One 4:e5429, 2009


All Time Past Year Past 30 Days
Abstract Views 1077 457 65
Full Text Views 1915 520 9
PDF Downloads 723 297 14
EPUB Downloads 0 0 0