Assistance to Ventilation in Spontaneously Breathing Subjects

نویسندگان

  • P M. A. Calverley
  • M. D. H. K. Chang
چکیده

In five supine normal subjects breathing spontaneously, we studied the effects of high-frequency chest wall oscillation (HFCWO), which was achieved by oscillating the pressure in an air-filled cuff wrapped around the lower thorax. Oscillations of 3.5 and 8 Hz (in randomized order) were applied for 15 minutes each at both maximal (mean of 90 to 102cm H,O) and half-maximal peak tolerable cuff preSSures. Fifteen minutes of control spontaneous ventilation preceded each HFCWO maneuver. The HFCWO resulted in a significant decrease in spontaneous minute ventilation (‘ Es) at maximal and half-maximal pressures by 35 and 40 per-

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تاریخ انتشار 2006