Table 4.
Top 20 keywords in terms of frequency and centrality of coronary chronic total occlusion.
| Rank | Key words | Frequency | Average age | Centrality |
|---|---|---|---|---|
| 1 | Chronic total occlusion | 912 | 2003 | 0.03 |
| 2 | Percutaneous coronary intervention | 867 | 2006 | 0.03 |
| 3 | Recanalization | 530 | 1999 | 0.08 |
| 4 | Revascularization | 435 | 2004 | 0.05 |
| 5 | Outcome | 421 | 2005 | 0.05 |
| 6 | Artery | 347 | 1999 | 0.10 |
| 7 | Intervention | 335 | 2004 | 0.08 |
| 8 | Impact | 328 | 2009 | 0.04 |
| 9 | Angioplasty | 327 | 1999 | 0.14 |
| 10 | Registry | 285 | 2011 | 0.02 |
| 11 | Insights | 203 | 2011 | 0.04 |
| 12 | Coronary artery disease | 187 | 2002 | 0.04 |
| 13 | Experience | 159 | 2004 | 0.02 |
| 14 | Disease | 149 | 2002 | 0.06 |
| 15 | Left ventricular function | 139 | 2006 | 0.04 |
| 16 | Success | 138 | 1999 | 0.06 |
| 17 | Metaanalysis | 132 | 2011 | 0.02 |
| 18 | Clinical outcome | 126 | 2011 | 0.06 |
| 19 | Artery disease | 126 | 1999 | 0.05 |
| 20 | Retrograde approach | 115 | 2008 | 0.02 |