Table 1.
Major Causes of Readmission at Nonindex Versus Index Hospital at 30 d After Coronary Artery Bypass Grafting: Nationally Weighted Resultsa
| Cause of Readmission | Nonindex Readmission at 30 d (n = 23,853) | Index Readmission at 30 d (n = 80,950) | P |
|---|---|---|---|
| Cardiac | 7013 (29.4%) | 22,504 (27.8%) | .031 |
| Heart failure | 3077 (12.9%) | 7852 (9.7%) | <.001 |
| Arrhythmias | 1455 (6.1%) | 5262 (6.5%) | .303 |
| Conduction disorders | 24 (0.1%) | 162 (0.2%) | .206 |
| Valve disorders | 143 (0.6%) | 567 (0.7%) | .183 |
| Hypertension | 48 (0.2%) | 162 (0.2%) | .519 |
| Pericarditis | 119 (0.5%) | 1457 (1.8%) | <.001 |
| Coronary artery disease | 477 (2.0%) | 1538 (1.9%) | .589 |
| Acute myocardial infarction | 358 (1.5%) | 1781 (2.2%) | .002 |
| Chest pain | 763 (3.2%) | 1943 (2.4%) | <.001 |
| Syncope | 215 (0.9%) | 648 (0.8%) | .481 |
| Other | 310 (1.3%) | 1295 (1.6%) | .113 |
| Noncardiac | 12,666 (53.1%) | 46,303 (57.2%) | <.001 |
| Respiratory | 4127 (17.3%) | 13,114 (16.2%) | .054 |
| Infectious | 2719 (11.4%) | 14,004 (17.3%) | <.001 |
| Bleeding | 668 (2.8%) | 2105 (2.6%) | .434 |
| Peripheral vascular disease | 883 (3.7%) | 5343 (6.6%) | <.001 |
| Renal/genitourinary | 644 (2.7%) | 2105 (2.6%) | .653 |
| Gastrointestinal | 859 (3.6%) | 2509 (3.1%) | .032 |
| Transient ischemic attack/stroke | 572 (2.4%) | 1781 (2.2%) | .082 |
| Trauma | 191 (0.8%) | 486 (0.6%) | .015 |
| Endocrine/metabolic | 787 (3.3%) | 2,024 (2.5%) | .001 |
| Neuropsychiatric | 406 (1.7%) | 971 (1.2%) | .011 |
| Hematological/neoplasm | 310 (1.3%) | 729 (0.9%) | .001 |
| Other | 453 (1.9%) | 1214 (1.5%) | .044 |
a
Tabulated results are based on primary diagnosis codes on readmission. Codes are presented in Supplemental Table 1. Two-sided P values were taken from chi-square tests.