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Table 1 Patient characteristics at index admission for PCI (excluding angioplasty only) and CABG during 2000-2004

From: Impact of the introduction of drug eluting stents on clinical outcomes in patients undergoing percutaneous and surgical coronary artery revascularisation procedures in Western Australia

  2000 2001 2002 2003 2004 Total
Number of patients (col%) 2669 2652 2765 2944 3088 14118
  BMS 1630 (61.1) 1725 (65.0) 1370 (49.6) 353 (12.0) 96 (3.1) 5174
  DES 0 0 486 (17.6) 1733 (58.9) 2200 (71.2) 4419
  CABG 1039 (38.9) 927 (35.0) 909 (32.9) 858 (29.1) 792 (25.6) 4525
Age       
  mean (SD) 63.7 (11.1) 63.8 (11.1) 64.2 (11.7) 64.0 (11.8) 64.3 (11.6) 64.0 (11.5)
  range 27-93 30-92 27-94 26-93 30-93 26-94
Males (%) 76.0 77.0 76.4 76.6 75.6 76.3
Main diagnosis, MI (%) 550 (20.6) 588 (22.2) 798 (28.9) 901 (30.6) 998 (32.3) 3835 (27.2)
Prior disease, no. (%)       
  MI 572 (21.4) 511 (19.3) 532 (19.2) 583 (19.8) 509 (16.5) 2707 (19.2)
  Stroke 51 (1.9) 41 (1.6) 37 (1.3) 30 (1.0) 44 (1.4) 203 (1.4)
  Diabetes 434 (16.3) 469 (17.7) 493 (17.8) 572 (19.4) 558 (18.1) 2526 (17.9)
  Renal failure 72 (2.7) 71 (2.7) 84 (3.0) 124 (4.2) 114 (3.7) 465 (3.3)
  Congestive heart failure 222 (8.3) 182 (6.9) 192 (6.9) 225 (7.6) 191 (6.2) 1012 (7.2)
  COPD 223 (8.4) 204 (7.7) 163 (5.9) 149 (5.1) 132 (4.3) 871 (6.2)
  PVD 156 (5.8) 156 (5.9) 126 (4.6) 174 (5.9) 144 (4.7) 756 (5.4)
Charlson score (mean) § 1.38 1.36 1.31 1.39 1.31 1.35
Number of vessels treated, no. (%) ††       
  single 1688 (65.4) 1704 (66.3) 1829 (67.6) 1954 (67.9) 2047 (68.2) 9222 (67.1)
  multi-vessel 891 (34.6) 867 (33.7) 876 (32.4) 925 (32.1) 956 (31.8) 4515 (32.9)
Patients with venous grafts in CABG cohort, n (%) # 853 (82.1) 755 (81.5) 746 (82.1) 722 (84.2) 675 (85.2) 3751 (82.9)
Patients with arterial grafts in CABG cohort, n (%) # 924 (88.9) 816 (88.0) 795 (87.5) 768 (89.5) 712 (89.9) 4015 (88.7)
Deaths within 28 days, no. (%) 53 (2.0) 45 (1.7) 58 (2.1) 41 (1.4) 80 (2.6) 277 (2.0)
Hospital type: public, no. (%) 1728 (64.7) 1668 (62.9) 1674 (60.5) 1791 (60.8) 1828 (59.2) 8689 (61.6)
Admission type: emergency, no. (%) 1008 (37.8) 1013 (38.2) 1100 (39.8) 1223 (41.5) 1366 (44.2) 5710 (40.4)
  1. CABG coronary artery bypass graft surgery, PCI percutaneous coronary intervention, BMS bare metal stent, DES drug eluting stent; col%, column percent, SD standard deviation, MI myocardial infarction.
  2. ¶ DES are with or without BMS, and were first used in mid-2002 in Western Australia.
  3. † Significant increasing trend during 2000-2004 in the proportion of MI as main discharge diagnosis (p<0.0001; Cochran-Armitage trend test).
  4. ‡ History of admissions for disease within 5 years of index admission for CABG or PCI. COPD, chronic obstructive pulmonary disease; PVD, peripheral vascular disease.
  5. § Charlson comorbidity score based on comorbidities within previous 5 years up to and including index admission, but excluding MI in the index admission. Mean Charlson score significantly higher in index CABG patients (p<0.0001 for each year; Wilcoxon two-sample test using Normal approximation with continuity correction).
  6. †† For CABG these were identified from ICD codes for procedures recorded in the Hospital Morbidity Data Collection. Some data were missing for both PCI and CABG.
  7. # Venous grafts are saphenous or other vein grafts; arterial grafts are internal mammary artery (left or right), radial artery or epigastric artery grafts.