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.
Loading. A bilevel positive airway pressure (BIPAP) machine features two pressure settings, high and low, to deliver room air through a mask into your airway. To match your natural breathing rhythm, the high pressure setting is used for inhaling, and the low pressure setting is used for exhaling. Many people who use a BIPAP machine for sleep disorders find that it is an easily tolerated way to keep the airway while sleeping.