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Title: Rapid shallow breathing (frequency-tidal volume ratio) did not predict extubation outcome
Authors: Lee, K.H.
Hui, K.P. 
Chan, T.B.
Tan, W.C. 
Lim, T.K. 
Issue Date: 1994
Citation: Lee, K.H., Hui, K.P., Chan, T.B., Tan, W.C., Lim, T.K. (1994). Rapid shallow breathing (frequency-tidal volume ratio) did not predict extubation outcome. Chest 105 (2) : 540-543. ScholarBank@NUS Repository.
Abstract: This was a prospective study of 52 patients that were extubated in our medical intensive care unit. Rapid shallow breathing, represented by a ratio of frequency to tidal volume (f/VT) of more than 105, was evaluated either on continuous positive airway pressure or pressure support prior to extubation as a marker of extubation outcome. Twelve out of 13 patients (92 percent) with rapid shallow breathing (f/VT ratio > 105) were successfully extubated. Out of 9 extubation failures only 1 patient had a f/VT ratio more than 105 (11 percent). A measured f/VT ratio of less than 105 had a sensitivity and specificity of 72 and 11 percent, respectively, for extubation success. Patients who had unsuccessful outcomes were ventilated for a significantly more prolonged period (9.6 ± 6.8 d vs 4.6 ± 3.9 d, unpaired t test, p = 0.004). We conclude that the presence of rapid shallow breathing during a weaning trial with the patient on partial ventilatory support does not necessarily preclude successful extubation.
Source Title: Chest
ISSN: 00123692
Appears in Collections:Staff Publications

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