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.
For example, a patient with anauto-PEEP of 10 cmH 2 O and a set pressure trigger of -2 cmH 2 O (and no ap-plied PEEP) has to generate an alveolar pressure of 12 cmH 2 O to generateabreath.Assistedbreathsshouldbelimitedtolessthan8â10breathspermin-ute and adequate time should be allowed for exhalation.