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).
Bipap Machines. BiPAP stands for Bilevel Positive Airway Pressure, and is very similar in function and design to a CPAP machine. Unlike a CPAP machine which delivers a constant standard pressure, a BiPAP machine has two pressure settings. One pressure is for inhalation (IPAP), and a lower pressure for exhalation (EPAP). When you breathe in, the pressure will increase to the prescribed amount, and lower during exhalation.