Table 2.
Association Between Index MI Characteristics and Reason for 30-Day Readmissions
| Reason for Readmission*, N (%) | ||||
|---|---|---|---|---|
| Related | Unrelated | Unclear | P value† | |
| Overall | 274 (42.6) | 194 (30.2) | 175 (27.2) | |
| Year of Index MI Diagnosis | ||||
| 1987–1992 | 65 (47.5) | 38 (27.7) | 34 (24.8) | 0.01 |
| 1993–1998 | 81 (53.3) | 40 (26.3) | 31 (20.4) | |
| 1999–2004 | 69 (35.8) | 67 (34.7) | 57 (29.5) | |
| 2005–2010 | 59 (36.7) | 49 (30.4) | 53 (32.9) | |
| Sex | ||||
| Male | 154 (46.5) | 84 (25.4) | 93 (28.1) | 0.02 |
| Female | 120 (38.5) | 110 (35.3) | 82 (26.3) | |
| Index MI Type | ||||
| Unknown | 7 (63.6) | 2 (18.2) | 2 (18.2) | 0.046 |
| STEMI | 84 (46.4) | 42 (23.2) | 55 (30.4) | |
| NSTEMI | 183 (40.6) | 150 (33.3) | 118 (26.2) | |
| Reperfusion/revascularization/ angiography performed during index MI hospitalization | ||||
| None | 70 (39.1) | 81 (45.3) | 28 (15.6) | --- |
| Angiogram Alone | 44 (47.8) | 25 (27.2) | 23 (25.0) | |
| Thrombolytics | 33 (61.1) | 8 (14.8) | 13 (24.1) | |
| PCI | 104 (37.6) | 72 (26.0) | 101 (36.5) | |
| CABG | 32 (51.6) | 11 (17.7) | 19 (30.7) | |
MI= myocardial infarction, STEMI=ST-segment elevation myocardial infarction, NSTEMI=non ST-segment elevation myocardial infarction, PCI=percutaneous coronary intervention
*
The proportion of readmissions that are related (related, unrelated, unclear) to the incident MI or its treatment are shown according to sex and characteristics of the index MI.
†
P value compares the proportions of related vs. unrelated vs. unclear readmissions by comparison group in the left column (e.g. sex). No p value is shown for reperfusion/revascularization as some patients received more than one treatment (e.g. thrombolytics and PCI).