RT Journal
A1 Dutton RE, Browner BD, Powers SR, Jr
T1 LUng volume and blood oxygenation after intermittent positive pressure breathing
JF Archives of Surgery
JO Archives of Surgery
YR 1979
FD May 1
VO 114
IS 5
SP 568
OP 571
DO 10.1001/archsurg.1979.01370290018003
UL http://dx.doi.org/10.1001/archsurg.1979.01370290018003
AB • Functional residual capacity (FRC) was measured in 12 postoperative patients and in one preoperative patient before and after they received intermittent positive pressure breathing (IPPB) with room air for ten minutes at a peak delivered pressure of 15 cm HO. Ten patients had a normal or low pretreatment FRC. After cessation of IPPB, the mean FRC decreased further. Arterial oxygen tensions, measured in 11 of the 13 patients, decreased in all 11 from a pretreatment mean of 67.8 ± 4.3 mm Hg to an immediate posttreatment mean of 57.7 ± 4.2 mm Hg. In five patients repeated arterial blood gases were measured. At 30 minutes, their arterial oxygen tensions had returned to the pre-IPPB values. This study demonstrates that the routine use of IPPB in postoperative patients accentuates preexisting hypoxia and, therefore, must be used with caution.(Arch Surg 114:568-571, 1979)