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.
Let me also explain BiPAP. It stands for Bilevel Positive Airway Pressure. There are two pressure settings, an inspiratory pressure and an expiratory pressure. The inspiratory pressure is intended to give a push of air on inspiration to help ease the work of breathing.