Table 1. Characteristics of patients.
| Variables | 23 G needle (n = 100) | 25 G needle (n = 100) | p |
|---|---|---|---|
| Age, mean (SD) | 66.01 (13.17) | 63.39 (15.21) | 0.35 |
| Gender, n(%) | 53 (53%) | 53 (53%) | 1 |
| Body Mass Index, mean (SD) | 32.03 (8.24) | 31.6 (9.42) | 0.35 |
| Underlying respiratory disease | |||
| COPD, n(%) | 29 (29%) | 30 (30%) | |
| Asthma, n(%) | 12 (12%) | 6 (6%) | |
| OHS, n(%) | 7 (7%) | 6 (6%) | 0.78 |
| OSA, n(%) | 24 (24%) | 23 (23%) | |
| Other, n(%) | 28 (28%) | 35 (35%) | |
| Tobacco use | |||
| Never smoked, n(%) | 38 (38%) | 38 (38%) | |
| Former smoker, n(%) | 51 (51%) | 46 (46%) | 0.65 |
| Active smoker, n(%) | 11 (11%) | 16 (16%) | |
| No previous arterial puncture, n(%) | 21 (21%) | 22 (22%) | 0.86 |
| Wrist diameter (cm), mean (SD) | 17.84 (2.54) | 17.68 (2.45) | 0.42 |
| Quality of radial pulse | |||
| Pulse not felt, n(%) | 2 (2%) | 0 (0%) | |
| Weak pulse, n(%) | 25 (25%) | 34 (34%) | |
| Normal pulse, n(%) | 56 (56%) | 46 (46%) | 0.13 |
| Hard beating pulse, n(%) | 16 (16%) | 15 (15%) | |
| Visible pulse, n(%) | 1 (1%) | 5 (5%) |