Characteristic of STEMI patients during the outbreak and the postoutbreak, compared with corresponding periods in 2018 and 2019
| Outbreak period of 2020 compared with corresponding period of 2018 and 2019 | Postoutbreak period of 2020 compared with corresponding period of 2018 and 2019 | Outbreak period compared with postoutbreak period of 2020 | |||||||||||
| 23 January 2018–27 March 2018 | 23 January 2019–27 March 2019 | 23 January 2020–27 March 2020 | P value (2018 vs 2019) | P value (2019 vs 2020) | 28 March 2018–31 July 2018 | 28 March 2019–31 July 2019 | 28 March 2020–31 July 2020 | P value (2018 vs 2019) | P value (2019 vs 2020) | 23 January 2020–27 March 2020 | 28 March 2020–31 July 2020 | P value | |
| Admissions for STEMI | 280 | 267 | 121 | 528 | 463 | 306 | 121 | 306 | |||||
| Age (years)* | 61.5 (14.7) | 62.0 (14.4) | 65.2 (12.3) | 0.685 | 0.036 | 60.1 (14.8) | 59.1 (13.5) | 60.7 (14.6) | 0.310 | 0.127 | 65.2 (12.3) | 60.7 (14.6) | 0.003 |
| Female, n (%) | 53 (18.9) | 42 (15.7) | 32 (26.4) | 0.382 | 0.019 | 94 (17.8) | 75 (16.2) | 54 (17.6) | 0.558 | 0.669 | 32 (26.4) | 54 (17.6) | 0.056 |
| Transfer mode, n (%) | |||||||||||||
| Directly via EMS | 22 (7.9) | 45 (16.9) | 7 (5.8) | 0.007 | 0.012 | 48 (9.1) | 43 (9.3) | 13 (4.2) | 0.482 | 0.010 | 7 (5.8) | 13 (4.2) | 0.666 |
| In-hospital | 8 (2.9) | 6 (2.2) | 6 (5.0) | 11 (2.1) | 4 (0.9) | 9 (2.9) | 6 (5.0) | 9 (2.9) | |||||
| Transfer-in | 82 (29.3) | 59 (22.1) | 34 (28.1) | 145 (27.5) | 129 (27.9) | 88 (28.8) | 34 (28.1) | 88 (28.8) | |||||
| Directly by self | 168 (60.0) | 157 (58.8) | 74 (61.2) | 324 (61.4) | 287 (62.0) | 196 (64.1) | 74 (61.2) | 196 (64.1) | |||||
| Clinical characteristics | |||||||||||||
| Sustainable chest pain, n (%) | 211 (75.4) | 188 (70.4) | 93 (76.9) | 0.228 | 0.233 | 406 (76.9) | 343 (74.1) | 240 (78.4) | 0.340 | 0.196 | 93 (76.9) | 240 (78.4) | 0.823 |
| Intermittent chest pain, n (%) | 55 (19.6) | 45 (16.9) | 17 (14.0) | 0.464 | 0.583 | 79 (15.0) | 82 (17.7) | 41 (13.4) | 0.278 | 0.135 | 17 (14.0) | 41 (13.4) | 0.984 |
| Chest pain relief, n (%) | 7 (2.5) | 4 (1.5) | 4 (3.3) | 0.596 | 0.438 | 8 (1.5) | 2 (0.4) | 8 (2.6) | 0.166 | 0.022 | 4 (3.3) | 8 (2.6) | 0.948 |
| Respiratory rate (breaths/min)* | 18.1 (3.6) | 18.3 (3.9) | 18.3 (3.2) | 0.485 | 0.961 | 18.1 (2.9) | 18.2 (3.4) | 18.2 (3.7) | 0.666 | 0.887 | 18.3 (3.2) | 18.2 (3.7) | 0.658 |
| Pulse frequency (pulse/min)* | 79.1 (19.8) | 78.0 (18.9) | 78.0 (23.7) | 0.513 | 0.986 | 77.2 (18.0) | 73.4 (18.8) | 76.3 (21.2) | 0.002 | 0.052 | 78.0 (23.7) | 76.3 (21.2) | 0.462 |
| Heart rate (beats/min)* | 79.2 (19.7) | 77.8 (19.7) | 78.2 (23.5) | 0.380 | 0.838 | 77.1 (17.9) | 73.6 (18.9) | 76.1 (21.2) | 0.004 | 0.091 | 78.2 (23.5) | 76.1 (21.2) | 0.367 |
| Systolic blood pressur (mm Hg)* | 130.3 (30.5) | 133.0 (28.3) | 128.3 (27.8) | 0.274 | 0.122 | 132.2 (28.0) | 133.3 (29.4) | 131.3 (29.1) | 0.568 | 0.360 | 128.3 (27.8) | 131.3 (29.1) | 0.325 |
| Diastolic blood pressure (mm Hg)* | 81.1 (20.3) | 82.6 (17.9) | 79.1 (19.5) | 0.354 | 0.083 | 82.8 (18.8) | 83.7 (20.0) | 82.0 (19.0) | 0.479 | 0.255 | 79.1 (19.5) | 82.0 (19.0) | 0.155 |
| Killip class (%) | |||||||||||||
| I | 195 (79.9) | 173 (84.4) | 89 (74.2) | 0.632 | 0.120 | 395 (84.9) | 344 (88.0) | 251 (82.6) | 0.485 | 0.129 | 89 (74.2) | 251 (82.6) | 0.144 |
| II | 22 (9.0) | 15 (7.3) | 12 (10.0) | 31 (6.7) | 17 (4.3) | 14 (4.6) | 12 (10.0) | 14 (4.6) | |||||
| III | 8 (3.3) | 4 (2.0) | 6 (5.0) | 10 (2.2) | 7 (1.8) | 12 (3.9) | 6 (5.0) | 12 (3.9) | |||||
| IV | 19 (7.8) | 13 (6.3) | 13 (10.8) | 29 (6.2) | 23 (5.9) | 27 (8.9) | 13 (10.8) | 27 (8.9) | |||||
*Mean (SD).
EMS, emergency medical service; STEMI, ST-segment-elevation myocardial infarction.