Table 1.
Baseline patient characteristics of unplanned readmissions following type B aortic dissection
| Characteristic | Overall | NR at 30 days | R at 30 days | P-value | NR at 90 days | R at 90 days | P-value |
|---|---|---|---|---|---|---|---|
| Total | 53,117 | 47,347 (89.1) | 5,770 (10.9) | - | 43,930 (82.7) | 9,187 (17.2) | - |
| Age, y | 66.6±0.2 | 66.6±0.2 | 67.1±0.3 | 0.1082 | 66.4±0.2 | 67.6±0.3 | 0.0002* |
| Age group, y | 0.3212 | 0.0039* | |||||
| <60 | 16,978 (32.0) | 15,191 (32.1) | 1,788 (31.0) | 14,256 (32.5) | 2,722 (29.6) | ||
| ≥60 | 36,139 (68.0) | 32,157 (67.9) | 3,982 (69.0) | 29,675 (67.5) | 6,465 (70.4) | ||
| Sex | 0.7313 | 0.0597 | |||||
| Male | 31,322 (59.0) | 27,941 (59.0) | 3,380 (58.6) | 26,044 (59.3) | 5,278 (57.5) | ||
| Female | 21,796 (41.0) | 19,407 (41.0) | 2,389 (41.4) | 17,887 (40.7) | 3,909 (42.5) | ||
| Location of hospital | 0.0342* | <0.0001* | |||||
| Central metro (≥1 million) | 15,717 (29.7) | 13,971 (29.5) | 1,773 (30.7) | 12,798 (29.1) | 2,956 (32.2) | ||
| Fringe metro (≥1 million) | 14,024 (26.5) | 12,448 (26.3) | 1,625 (28.2) | 11,544 (26.3) | 2,530 (27.5) | ||
| Metro (250,000-999,999) | 10,447 (19.7) | 9,440 (20.0) | 1,164 (20.2) | 8,766 (20.0) | 1,837 (20.0) | ||
| Small metro/micropolitan (<250,000) | 12,740 (24.1) | 11,488 (24.3) | 1,208 (20.9) | 10,821 (24.6) | 1,864 (20.3) | ||
| Insurance | 0.1523 | 0.9720 | |||||
| Private/medicare | 42,495 (80.1) | 37,956 (80.3) | 4,539 (78.9) | 35,151 (80.2) | 7,344 (80.1) | ||
| Medicaid/other | 10,525 (19.9) | 9,311 (19.7) | 1,214 (21.1) | 8,704 (19.8) | 1,822 (19.9) | ||
| Median household income for zip code, quartiles | 0.0048* | 0.0005* | |||||
| 1st quartile (0%-25%) | 16,223 (31.1) | 14,262 (30.6) | 1,960 (34.6) | 13,098 (30.3) | 3,125 (34.6) | ||
| 2nd quartile (26%-50%) | 12,968 (24.8) | 11,631 (25.0) | 1,337 (23.6) | 10,859 (25.1) | 2,109 (23.3) | ||
| 3rd quartile (51%-75%) | 12,009 (23.0) | 10,769 (23.1) | 1,240 (21.9) | 10,043 (23.3) | 1,966 (21.7) | ||
| 4th quartile (76%-100%) | 11,026 (21.1) | 9,897 (21.3) | 1,129 (19.9) | 9,183 (21.3) | 1,843 (20.4) | ||
| DRG severity | <0.0001* | <0.0001* | |||||
| Minor | 6,132 (11.5) | 5,461 (11.5) | 671 (11.6) | 5,065 (11.5) | 1,067 (11.6) | ||
| Moderate | 10,635 (20.0) | 9,709 (20.5) | 925 (16.0) | 9,153 (20.8) | 1,482 (16.1) | ||
| Major | 26,451 (49.8) | 23,745 (50.2) | 2,706 (46.9) | 22,088 (50.3) | 4,363 (47.5) | ||
| Extreme | 9,899 (18.6) | 8,433 (17.8) | 1,467 (25.4) | 7,625 (17.4) | 2,274 (24.7) | ||
| Elixhauser Comorbidity Score | 4.9±0.1 | 4.7±0.1 | 6.1±0.2 | <0.0001* | 4.6±0.1 | 6.0±0.2 | <0.0001* |
| Year | 0.0465* | <0.0001* | |||||
| 2012 | 12,991 (24.4) | 11,445 (24.2) | 1,546 (26.8) | 10,457 (23.8) | 2,534 (27.6) | ||
| 2013 | 13,554 (25.5) | 12,151 (25.7) | 1,404 (24.3) | 11,291 (25.7) | 2,263 (24.6) | ||
| 2014 | 14,331 (27.0) | 12,765 (27.0) | 1,566 (27.1) | 11,820 (26.9) | 2,511 (27.3) | ||
| 2015 | 12,241 (23.0) | 10,988 (23.2) | 1,254 (21.7) | 10,363 (23.6) | 1,878 (20.4) | ||
| Management | 0.0003* | 0.0723 | |||||
| Medical | 46,985 (88.5) | 42,035 (88.8) | 4,950 (85.8) | 38,951 (88.7) | 8,035 (87.5) | ||
| Thoracic endovascular aortic repair | 6,132 (11.5) | 5,313 (11.2) | 820 (14.2) | 4,980 (11.3) | 1,152 (12.5) | ||
| Urgent procedure | 46,350 (87.3) | 41,225 (87.1) | 5,125 (88.8) | 0.0319* | 38,150 (86.8) | 8,200 (89.3) | 0.0004* |
| Concomintant procedures | |||||||
| Proximal debranching | 1,206 (2.3) | 1,038 (2.2) | 168 (2.9) | 0.0894 | 955 (2.2) | 251 (2.7) | 0.0940 |
| Iliac access | 604 (1.1) | 479 (1.0) | 125 (2.2) | 0.0033* | 432 (1.0) | 172 (1.9) | 0.0012* |
Values are presented as number (%) or mean±standard error.
NR, not readmitted; R, readmitted; DRG, Patient Refined Diagnosis Related Group.
*Statistically significant P<0.05.