The invention relates to the field of medical polymer material, in particular to a PH sensitive and biologically degradable polymer, the preparation method and the function thereof.

本发明涉及医药用高分子材料领域，具体涉及一种pH敏感、并可生物降解的共聚物及其制备方法和用途。

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Conclusion: Respiratory variation of SVC systolic forward flow was a sensitive index for evaluating presence and severity of PH in patients with COPD.

结论：SVC收缩期正向血流的呼吸变化性是检测COPD患者肺动脉高压的敏感指标。

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To investigate whether acid reflux is involved at all, doctors can do a 24-hour pH test, inserting an acid-sensitive probe through the patient's nose into the esophagus, where it records any episodes of reflux.

WSJ: Why Your Heartburn Drugs Don't Work