Table 2.
Summary of previous studies regarding inoperable severe AS patients
| Authors | Year | Country (No. of centers) | Patients analyzed | Mean age (years) | Percentage of patients ≥80 years | Risk scores | Percentage of inoperable patients |
|---|---|---|---|---|---|---|---|
| Bouma, et al.3) | 1999 | Netherland (3) | 205 | 78 | 46% | NA | 41% |
| Iung, et al.4) | 2005 | Europe (92) | 216 | 82 | 54% | Euro 9% | 33% |
| Charlson5) | 2006 | US (2) | 124 | 85 | NA | NA | 61% |
| Bach, et al.6) | 2009 | US (3) | 369 | 73 | 39% | STS 2.7% | 52% |
| Leon, et al.7) | 2010 | mainly US (21) | NA | 83 | NA | STS 12%; Euro 30% | NA |
| Present study | 2014 | Japan (17) | 61 | 86 | 79% | STS 11% | 33% |
Euro: EuroSCORE; NA: not applicable; STS: Society of Thoracic Surgeons score; US: United States