Impact Factor & Ranking

6.0 4.5 3.0 1.5 5.261 2014 2015 2016 2017 2018 5.261 2014 2015 2016 2017 2018
  • 1 123
    #26
  • 1 57
    #9
  • 1 198
    #12
  • 1 124
    #36
  • 1 58
    #14
  • 1 200
    #20
  • 1 126
    #34
  • 1 59
    #9
  • 1 196
    #12
  • 1 128
    #28
  • 1 59
    #8
  • 1 200
    #9
  • 1 136
    #24
  • 1 63
    #8
  • 1 203
    #9

About Impact Factor & Ranking

Measure of the number of times an average paper in this journal is cited. Copyright Clarivate Analytics.

Metrics

Year I.F. Cardiac & cardiovascular systems Respiratory system Surgery
2018 5.261 24/136 8/63 9/203
2017 28/128 8/59 9/200
2016 34/126 9/59 12/196
2015 36/124 14/58 20/200
2014 26/123 9/57 12/198

Definition

Impact Factor

The Journal Impact Factor is published each year by Clarivate Analytics. It is a measure of the number of times an average paper in a particular journal is cited during the preceding two years.
For example:

A = the number of times articles published in a specific journal in 2014 and 2015 were cited by journals during 2016.
B = the total number of 'citable items' published by that journal in 2014 and 2015. ('Citable items' are usually articles, reviews, proceedings, etc.; not editorials or letters-to-the-editor.)

2016 impact factor = A/B.

Actual value is intentionally only displayed for the most recent year. Earlier values are available in the Journal Citation Reports from Clarivate Analytics

ISI ranking

Journals are often ranked by Impact Factor in an appropriate Clarivate Analytics subject category. As there are now two Impact Factors published – two-year and five-year Impact Factors – this rank may differ, so care is needed when assessing these ranked lists to understand which of the two metrics is being used. In addition, journals can be categorized in multiple subject categories, giving them different ranks for each subject. Consequently, a rank should always be in context to the subject category.