Speaking roughly, normal levels of thyroid-stimulating hormone (TSH) are in the range of 0.4 to 4.0 mIU/L. However, each laboratory and test manufacturer identifies its own normal TSH range.
This pressure is typically set slightly higher than atmospheric pressure to prevent atelectasis, decrease inspiratory work of breathing, or improve gas exchange depending on the clinical scenario. This positive end-expiratory pressure (PEEP) is generated by a resistor in the exhalation port of the ventilator (Fig. 2).
In addition, for a. given plateau pressure, it is also possible to mathematically. optimize PEEP and I:E ratio combinations so as to avoid. excessive amounts of either. Key words: mean airway pressure; i:e ratio; positive end-expiratory. pressure; plateau pressure. INTRODUCTION.