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Normal Physiological Respiratory Changes During Pregnancy
| Increased | Decreased |
|---|---|
| Tidal volume | Functional residual capacity |
| Minute ventilation | Residual volume |
| Alveolar-arterial O2 gradient | Diffusion capacity |
| Oxygen partial pressure | PaCO2 |
| pH, normal or slightly elevated (respiratory alkalosis) |
|
| Respiratory rate unchanged |
Adapted from Weinberger et al.17
