Flovent Inhaler

- High-volume, Low-pressure Cuffs (6)

When Cl decreased to 15 ml/cm H20 (Fig 2B), every cuff required higher baseline inflation pressures, and differences among the three cuff groups became evident. To achieve identical performance, especially under conditions of reduced Cl, the 7.0 LO required the highest pressures, the MED cuffs required intermediate pressures and the HI cuffs required the lowest pressures (p<0.05). Differences in performance also were discernible between the 7.0 and 8.0 HI cuffs.
Figure 3 shows a typical pressure tracing from the testing of a 7.0-mm ID ETT with a HI cuff. In the highly compliant lung (Cl = 100 ml/cm H20), the cuff had to be inflated to approximately 20 mm Hg in order to seal with a 5 percent Vt leak. Intracuff pressure exhibited little change with ventilation, sometimes rising slightly during inspiration. Under conditions of decreased compliance, the cuff had to be inflated to a baseline of approximately 40 mm Hg in order to seal with a 5 percent leak. Intracuff pressure was now greatly affected by ventilation, increasing by 50 percent during inspiration. Intracuff pressure remained constant at 40 mm Hg as the airway pressure rose from zero to 40 mm Hg. Intracuff pressure began to increase as the airway pressure exceeded the baseline cuff inflation pressure. Thereafter, intracuff pressure equaled airway pressure as both rose simultaneously to the PIP of 60 mm Hg.

June 13, 2013 Cardiac function
Tags: airway pressure ischemic tracheal complications tracheal stenosis