Table 4.
Results of simulated bed allocation scenarios
| Bed Scenario | Wait Time (h) |
Bed Occupancy (%) |
||||
|---|---|---|---|---|---|---|
| Overall | Acute | Subacute | Overall | ICU | SDU | |
| Unit composition | ||||||
| 51 ICU + 0 SDU | 1.06 (1.04–1.09) | 0.56 (0.54–0.58) | 1.55 (1.52–1.59) | 84.3 (84.3–84.4) | 84.3 (84.3–84.4) | — |
| 46 ICU + 5 SDU | 1.05 (1.03–1.08) | 0.60 (0.58–0.62) | 1.48 (1.45–1.52) | 84.3 (83.3–84.4) | 83.1 (83.0–83.1) | 95.7 (95.7–95.8) |
| 41 ICU + 10 SDU | 1.07 (1.05–1.10) | 0.68 (0.67–0.70) | 1.44 (1.40–1.47) | 84.3 (84.2–84.3) | 81.7 (81.7–81.8) | 94.7 (94.7–94.7) |
| 36 ICU + 15 SDU* | 1.13 (1.11–1.16) | 0.84 (0.82–0.86) | 1.39 (1.35–1.42) | 84.2 (84.1–84.2) | 80.4 (80.4–80.5) | 93.2 (93.2–93.2) |
| 31 ICU + 20 SDU | 1.23 (1.20–1.26) | 1.14 (1.12–1.17) | 1.26 (1.22–1.29) | 84.0 (83.9–84.0) | 79.6 (79.5–79.7) | 90.7 (90.7–90.8) |
| Reserved acute beds | ||||||
| 1 Reserved bed | 2.23 (2.17–2.28) | 0.31 (0.31–0.32) | 4.27 (4.16–4.38) | 84.7 (84.7–84.8) | 80.8 (80.8–80.9) | 94.0 (94.0–94.1) |
| 2 Reserved beds | 3.00 (2.93–3.07) | 0.22 (0.21–0.22) | 5.99 (5.85–6.12) | 84.8 (84.7–84.8) | 80.8 (80.7–80.8) | 94.4 (94.4–94.4) |
| ICU bed expansion | ||||||
| 37 ICU + 15 SDU | 0.76 (0.74–0.78) | 0.58 (0.56–0.59) | 0.92 (0.89–0.94) | 83.0 (82.9–83.0) | 78.9 (78.8–79.0) | 93.0 (93.0–93.0) |
| 38 ICU + 15 SDU | 0.50 (0.48–0.51) | 0.39 (0.37–0.40) | 0.59 (0.57–0.61) | 82.0 (81.9–82.0) | 77.7 (77.6–77.7) | 92.9 (92.9–92.9) |
| 39 ICU + 15 SDU | 0.33 (0.32–0.34) | 0.26 (0.25–0.27) | 0.38 (0.37–0.40) | 81.1 (81.1–81.2) | 76.6 (76.6–76.7) | 92.8 (92.8–92.8) |
| 40 ICU + 15 SDU | 0.21 (0.20–0.22) | 0.17 (0.16–0.18) | 0.24 (0.23–0.25) | 80.5 (80.4–80.5) | 75.9 (75.8–76.0) | 92.7 (92.7–92.7) |
| Target TTT | ||||||
| 1 h | 0.69 (0.67–0.70) | 0.51 (0.50–0.53) | 0.83 (0.81–0.85) | 73.5 (73.3–73.6) | 65.5 (65.3–65.7) | 92.7 (92.6–92.7) |
| 2 h | 0.85 (0.83–0.87) | 0.64 (0.62–0.66) | 1.03 (1.00–1.06) | 74.7 (74.5–74.8) | 67.1 (66.9–67.3) | 92.9 (92.8–92.9) |
| 3 h | 1.06 (1.04–1.09) | 0.79 (0.77–0.81) | 1.30 (1.26–1.33) | 75.5 (75.4–75.7) | 68.2 (68.0–68.4) | 93.1 (93.1–93.1) |
| 4 h | 1.28 (1.25–1.30) | 0.94 (0.92–0.97) | 1.56 (1.52–1.60) | 76.6 (76.4–76.7) | 69.6 (69.4–69.8) | 93.3 (93.2–93.3) |
| 5 h | 1.57 (1.54–1.60) | 1.16 (1.13–1.18) | 1.93 (1.88–1.97) | 77.6 (77.4–77.7) | 70.9 (70.7–71.1) | 93.5 (93.5–93.5) |
| 6 h | 1.96 (1.91–2.00) | 1.44 (1.40–1.48) | 2.40 (2.35–2.46) | 78.6 (78.4–78.8) | 72.3 (72.1–72.5) | 93.7 (93.7–93.7) |
Definition of abbreviations: ICU = intensive care unit; SDU = step-down unit; TTT = time to transfer.
Data presented as mean (95% confidence interval). Mean values are reported based on a simulation with 10,000 iterations; 95% confidence intervals are calculated assuming a “sample size” of 10,000. Wait time is time from ICU bed request to physical transfer. Bed occupancy is proportion of available bed-hours that are occupied by patients.
*
Existing number of ICU and SDU beds at this institution.