Table 1

Patient characteristics for patients who underwent primary PCI for ST-elevation myocardial infarction according to those who are admitted prelockdown and postlockdown

VariablePrelockdown (n=33 255)Postlockdown (n=683)P value*
Median age (IQR)63 (55–73)64 (55-72)0.45
Male, n (%)24 829 (74.7)498 (72.9)0.30
Ethnicity, n (%)0.30
 Caucasian23 893 (85.8)482 (84.3)
 Black, Asian or other3952 (14.2)90 (15.7)
Smoker, n (%)7869 (40.9)148 (38.1)0.26
Hypertension, n (%)13 826 (43.2)234 (39.4)0.067
Hypercholesterolaemia, n (%)11 186 (34.9)195 (32.8)0.29
Diabetes mellitus, n (%)6006 (18.5)107 (16.4)0.16
Left ventricular function, n (%)0.95
 Good4289 (44.0)79 (45.1)
 Fair/moderate4350 (44.6)76 (43.4)
 Poor1109 (11.4)20 (11.4)
Renal failure, n (%)0.42
 None30 192 (98.1)579 (98.0)
 Acute renal failure439 (1.4)11 (1.9)
 Chronic renal failure136 (0.4)1 (0.2)
Previous MI, n (%)4046 (12.4)72 (11.4)0.43
Previous stroke, n (%)1220 (3.8)16 (2.7)0.16
Previous PCI, n (%)4081 (12.5)75 (11.8)0.60
Previous CABG, n (%)787 (2.4)15 (2.3)0.92
Peripheral vascular disease, n (%)898 (2.8)10 (1.7)0.10
Valvular heart disease, n (%)62 (2.0)4 (0.7)0.024
Radial access, n (%)27 917 (84.0)611 (89.5)<0.001
Multivessel intervention, n (%)4229 (12.7)109 (16.0)0.012
Vessel of intervention, n (%)
 Left main917 (2.8)17 (2.5)0.67
 RCA13 982 (42.0)282 (41.3)0.69
 LAD14 683 (44.2)308 (45.1)0.62
 LCx5881 (17.7)143 (20.9)0.028
 Graft348 (1.1)8 (1.2)0.75
Medications, n (%)
 Clopidogrel7160 (21.5)75 (11.0)<0.001
 Ticagrelor16 165 (48.6)280 (41.0)<0.001
 Prasugrel2130 (6.4)88 (12.9)<0.001
Glycoprotein IIb/IIIa inhibitor9195 (27.7)154 (22.6)0.003
Imaging (OCT/IVUS), n (%)2348 (7.1)52 (7.6)0.58
Rotational atherectomy, n (%)71 (0.2)1 (0.2)0.71
IABP, n (%)625 (1.9)2 (0.3)0.002
ECMO/impella, n (%)19 (0.06)1 (0.2)0.34
Cardiogenic shock, n (%)2474 (7.4)42 (6.2)0.20
Inotropes, n (%)1333 (4.0)19 (2.8)0.11
Thrombectomy device use, n (%)5142 (15.5)84 (12.3)0.023
Number of stents, n (%)0.38
 03460 (10.4)61 (8.9)
 118 950 (57.0)405 (59.3)
 27568 (22.8)158 (23.1)
 3+3277 (9.9)59 (8.6)
TIMI 3 flow post procedure, n (%)26 598 (84.6)559 (89.6)0.001
Route, n (%)0.010
 Direct from community27 014 (81.2)579 (84.8)
 Hospital transfer5375 (16.2)82 (12.0)
 Already in hospital866 (2.6)22 (3.2)
Median time from symptom to hospital (IQR)135 (89–250)150 (99–270)0.004
Median time from door to balloon (IQR)37 (16–94)48 (21–112)<0.001
Out-of-hours symptom onset, n (%)19 744 (60.9)372 (60.7)0.92
Out-of-hours PCI, n (%)17 949 (54.0)367 (54.7)0.90
  • *Mann-Whitney test for continuous variables and χ2 test for categorical variables.

  • CABG, coronary artery bypass graft; ECMO, extracorporeal membrane oxygenation; IABP, intra-aortic balloon pump; IVUS, intravascular ultrasound; LAD, left anterior descending; LCx, left circumflex; MI, myocardial infarction; OCT, optical coherence tomography; PCI, percutaneous coronary intervention; RCA, right coronary artery; TIMI, thrombolysis in myocardial infarction.