TABLE 4.
Time to result for most common etiologic agents of HAP/VAP isolated from BAL and ETA specimensa
| Etiologic agent | Time to first ID |
Time to first AST |
||||
|---|---|---|---|---|---|---|
| Median time (h) |
P | Median time (h) |
P |
|||
| BAL | ETA | BAL | ETA | |||
| Gram positive, monomicrobial | ||||||
| Staphylococcus aureus | 32.0 (21.5–49.2) | 28.5 (19.3–45.9) | <0.0001 | 60.5 (45.7–70.2) | 57.7 (46.5–71.3) | 0.54 |
| Streptococcus pneumoniae | 47.3 (25.7–70.1) | 39.7 (22.9–57.4) | <0.0001 | 72.9 (67.5–91.0) | 75.5 (63.8–92.1) | 0.82 |
| Gram negative, monomicrobial | ||||||
| Acinetobacter spp. | 46.6 (23.7–69.0) | 42.7 (22.6–63.9) | .10 | 68.3 (49.8–77.3) | 63.6 (47.5–79.4) | 0.11 |
| Escherichia coli | 43.2 (23.8–49.1) | 38.2 (20.8–47.8) | 0.0005 | 48.2 (44.1–66.1) | 47.5 (41.9–58.8) | 0.0024 |
| Enterobacter spp. | 42.2 (23.1–50.5) | 39.5 (20.9–49.7) | 0.031 | 48.0 (43.7–66.4) | 49.9 (42.7–63.2) | 0.93 |
| Haemophilus spp. | 43.3 (24.4–54.9) | 34.1 (21.1–50.1) | <0.0001 | 68.4 (50.9–78.8) | 69.9 (58.2–85.8) | 0.071 |
| Klebsiella spp. | 41.9 (22.9–50.1) | 38.4 (21.3–48.1) | 0.021 | 47.9 (43.8–66.3) | 48.8 (42.9–60.6) | 0.15 |
| Pseudomonas aeruginosa | 43.4 (23.7–62.3) | 34.3 (21.2–50.3) | <0.0001 | 64.4 (46.8–72.6) | 58.8 (47.8–72.4) | 0.048 |
| Serratia marcescens | 44.7 (24.0–50.6) | 41.6 (26.3–51.1) | 0.55 | 49.2 (45.0–64.1) | 50.0 (43.1–63.6) | 0.71 |
| Stenotrophomonas maltophilia | 46.2 (23.9–69.0) | 38.4 (21.3–58.4) | 0.0046 | 68.3 (51.2–85.3) | 64.3 (51.2–78.1) | 0.039 |
| Polymicrobial | ||||||
| Mixed Gram positive (n = 611) | 38.3 (23.4–51.2) | 35.9 (22.0–53.1) | 0.41 | 67.3 (48.6–81.1) | 67.2 (54.2–77.9) | 0.65 |
| Mixed Gram negative (n = 1,627) | 44.3 (23.9–67.5) | 42.3 (23.3–63.6) | 0.35 | 66.7 (48.0–73.5) | 64.5 (50.0–75.6) | 0.80 |
| Mixed Gram positive and negative (n = 3,589) | 36.4 (22.2–52.7) | 34.3 (20.3–53.3) | 0.11 | 66.1 (47.4–73.5) | 62.3 (48.6–74.8) | 0.18 |
a
IQR values are indicated in parentheses.