Article Figures & Data
Figures
- Figure 1
In patients who received blood transfusions, there was a modest decrease in number of units transfused with the 25th percentile decreasing from 2 units to 1 unit (Mann-Whitney U test p=0.005). At one institution, there was an educational campaign aimed at reducing the minimum transfusion from 2 units to 1 unit with the slogan, ‘Why give two when one will do?’
Tables
- Table 1
Select patient and operative characteristics by site
Variable Hospital A Hospital B Hospital C All patients P value No. of patients 6719 8892 7829 23 440 Emergency case, % 17.7% 13.2% 9.3% 13.2% <0.001 Outpatient surgery, % 35.7% 32.7% 20.1% 29.4% <0.001 Mean primary procedure work relative value units (RVUs) (SD) 17.3 (8.5) 15.2 (7.6) 16.1 (8.5) 16.2 (8.2) <0.001 Patient’s age≤40 years 24.5% 22.5% 17.2% 21.3% <0.001 Patient’s age >70 years 13.3% 14.3% 21.5% 16.4% Male, % 43.0% 43.7% 39.3% 42.0% <0.001 Minority race, % 8.6% 13.0% 23.4% 15.2% <0.001 ASA class III 51.1% 52.7% 42.7% 48.9% <0.001 ASA class IV–V 6.0% 4.4% 4.3% 4.8% HCT >38% 68.2% 67.6% 69.2% 68.3% <0.001 HCT 35.1%–38% 12.9% 14.6% 15.0% 14.2% HCT≤35% 18.9% 17.8% 15.8% 17.5% ASA, American Society of Anesthesiologists; HCT, hematocrit.
- Table 2
Transfusion rates by emergent status, period and site
All cases Emergent Non-emergent 2011–13 2014–16 2011–13 2014–16 2011–13 2014–16 All sites n 12 268 11 172 1596 1502 10 672 9670 Transfused % 6.4% 4.8%*** 16.6% 11.5%*** 4.9% 3.7%*** Hospital A n 3579 3140 641 548 2938 2592 Transfused % 7.5% 5.2%*** 17.5% 13.7% 5.3% 3.4%*** Hospital B n 4450 4442 520 658 3930 3784 Transfused % 7.9% 4.3%*** 21.0% 9.4%*** 6.2% 3.4%*** Hospital C n 4239 3590 435 296 3804 3294 Transfused % 4.0% 5.0%* 10.1% 11.8% 3.3% 4.4%* *P<0.05; ***p<0.001 (change in period 2 was statistically significant).
- Table 3
Transfusion rates by preoperative HCT level, period and site
Period HCT >38% or unknown† HCT 35.1%–38% HCT ≤35% 2011–13 2014–16 2011–13 2014–16 2011–13 2014–16 All sites n 8370 7634 1823 1517 2075 2021 Transfused % 2.5% 1.4%*** 6.3% 3.9%** 22.6% 18.0%*** Hospital A n 2438 2144 464 402 677 594 Transfused % 2.8% 1.6%** 6.7% 4.0% 24.8% 18.7%** Hospital B n 2937 3071 717 580 796 791 Transfused % 3.3% 1.3%*** 8.1% 3.8%** 24.9% 16.1%*** Hospital C n 2995 2419 642 535 602 636 Transfused % 1.4% 1.4% 3.9% 4.3% 17.1% 19.2% **p<0.01; ***p<0.001 (change in period 2 was significant).
†13% of operations had unrecorded HCT with a disproportionate number of elective outpatient operations. These were classified as low transfusion risk, HCT >38%.
HCT, hematocrit.
Supplementary data
