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).
Now letâs go back to peak and plateau pressures: Peak inspiratory pressure (PIP) = plateau pressure (Pplat) + pressure required to overcome airway resistance. Consequently, plateau pressure can never be higher than the peak, because thereâs always going to be intrinsic resistance which must be overcome.