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(Chest. 1974;65:152-157.)
© 1974 American College of Chest Physicians

The First Few Hours Off a Respirator

Robert Gilbert M.D.1; J. H. Auchincloss Jr. M.D.1; David Peppi B.S.1; and Kumar Ashutosh M.D.1

1 Department of Medicine, State University of New York, Upstate Medical Center, Syracuse, N.Y.

Fourteen patients receiving prolonged assisted ventilation were studied during their first trial period off the respirator. To avoid artifacts due to valves, mouthpieces, and noseclips, tidal volume off the respirator was measured continuously by electromagnetic sensors which detected changes in the anterior and posterior diameter of the rib cage and abdomen. Within five minutes of withdrawal from the respirator tidal volume fell, often to surprisingly low values, and respiratory frequency rose. Mean ventilation did not change. The changes in tidal volume, respiratory frequency, and heart rate did not indicate the changes which were occurring in the arterial blood gas levels. Furthermore, the magnitude of the changes in the breathing pattern did not predict whether or not the trial off the respirator would be successful. Tbe changes in tidal volume, respiratory frequency, heart rate and the blood gas values did not correlate well with the subjective sensation of dyspnea.

Submitted on March 29, 1974
Accepted on September 17, 1974




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N. R. MacIntyre
Evidence-Based Guidelines for Weaning and Discontinuing Ventilatory Support : A Collective Task Force Facilitated by the American College of Chest Physicians; the American Association for Respiratory Care; and the American College of Critical Care Medicine
Chest, December 1, 2001; 120(6_suppl): 375S - 396S.
[Abstract] [Full Text] [PDF]


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