Table 2.
Arterial Blood Gases and Alveolar-Arterial Oxygen Difference While Breathing Room Air
| PE No Prior CPD N=48 n (%) | No PE No Prior CPD N=88 n (%) | PE All Patients N=74 n (%) | No PE All Patients N=186 n (%) | |
|---|---|---|---|---|
| PaO2 (mm Hg) | ||||
| ≤49 | 1 (2) | 2 (2) | 4 (5) | 17 (9) |
| 50-59 | 6 (13) | 12 (14) | 12 (16) | 32 (17) |
| 60-69 | 15 (31) | 14 (16) # | 20 (27) | 35 (19) |
| 70-79 | 8 (17) | 13 (15) | 14 (19) | 32 (17) |
| ≥80 | 18 (38) | 47 (53) | 24 (32) | 70 (38) |
| PaCO2 (mm Hg) | ||||
| ≤35 | 30 (63) | 39 (44) # | 42 (57) | 65 (35) ** |
| 36-39 | 12 (25) | 17 (19) | 18 (24) | 39 (21) |
| ≥40 | 6 (13) | 32 (36) | 14 (19) | 82 (44) ^ |
| PH (units) | ||||
| <7.35 | 0 (0) | 7 (8) # | 0 (0) | 13 (7) * |
| 7.35-7.45 | 29 (60) | 60 (68) | 41 (55) | 131 (70) * |
| >7.45 | 19 (40) | 21 (24) | 33 (45) | 42 (23) ^ |
| A-a O2 difference (mm Hg) | ||||
| ≤20 | 17 (35) | 44 (50) | 24 (32) | 70 (38) |
| 21-30 | 4 (8) | 10 (11) | 5 (7) | 32 (17) # |
| 31-40 | 11(23) | 13 (15) | 18 (24) | 30 (16) |
| 41-50 | 9 (19) | 13 (15) | 14 (19) | 32 (17) |
| 51-60 | 5 (10) | 6 (7) | 10 (14) | 17 (9) |
| ≥61 | 2 (4) | 2 (2) | 3 (4) | 5 (3) |
CPD=cardiopulmonary disease, PE=pulmonary embolism.
#
P < .05
*
P < .025
**
P < .01
^
P < .001