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.
A common strategy is to combine SIMV with an additional ventilator mode known as pressure support ventilation (PSV) (Fig. 4). In this situation, inspiratory pressure is added to spontaneous breaths to overcome the resistance of the endotracheal tube or to increase the volume of spontaneous breaths.
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.