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.
Installed height is determined by how much the spring is compressed to arrive at proper seat pressure. Open pressure is the pressure exerted on the valve when it is in the open position, while seat pressure, the most critical, is the amount of pressure exerted on the valve while it is on the seat.