Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 1985;11(2):68-75.
doi: 10.1007/BF00254777.

Decelerating inspiratory flow waveform improves lung mechanics and gas exchange in patients on intermittent positive-pressure ventilation

N Al-Saady, E D Bennett

Decelerating inspiratory flow waveform improves lung mechanics and gas exchange in patients on intermittent positive-pressure ventilation

N Al-Saady et al. Intensive Care Med. 1985.

Abstract

The effects of two inspiratory flow waveforms (WFs), decelerating and constant have been studied in 14 patients undergoing intermittent positive-pressure ventilation (IPPV). With tidal volume (VT), inspiratory time, inspiratory-expiratory (I/E) ratio and frequency being kept constant, the decelerating waveform produced statistically significant reduction of peak pressure, total respiratory resistance, work of inspiration, ratio of dead space to tidal volume (VD/VT) and alveolar-arterial gradient for oxygen (A-a)PO2. There was significant increase in total static and kinetic compliances and PaO2, with no significant changes in PaCO2, in cardiac output (CO) and in other haemodynamic measurements.

PubMed Disclaimer

References

    1. Am Rev Respir Dis. 1969 Oct;100(4):518-25 - PubMed
    1. Anesthesiology. 1965 Mar-Apr;26:168-78 - PubMed
    1. Med Biol Eng. 1974 Mar;12(2):160-9 - PubMed
    1. Acta Anaesthesiol Scand. 1975;19(1):8-18 - PubMed
    1. Acta Anaesthesiol Scand. 1968;12(4):191-211 - PubMed