Back to Journals » International Journal of Chronic Obstructive Pulmonary Disease » Volume 4

Can dead space fraction predict the length of mechanical ventilation in exacerbated COPD patients?

Authors Farah R, Makhoul N

Published 25 November 2009 Volume 2009:4 Pages 437—441

DOI https://doi.org/10.2147/COPD.S7509

Review by Single anonymous peer review

Peer reviewer comments 3



Raymond Farah1, Nicola Makhoul2

1Specialist in Internal Medicine and Nephrology, Department of Internal Medicine B, Ziv Medical Center, Safed-Israel; 2Director of Respiratory Intensive Care Unit, Western Galilee Hospital, Nahariya, Israel

Background: Chronic obstructive pulmonary disease (COPD) is a condition in which there is limited airflow during expiration (exhaling, or breathing out) that is not fully reversible and usually worsens over time. The disease is estimated to kill more than 100,000 Americans each year, and costs related to care of patients with COPD are significant. Physiologically, COPD represents a disruption in ventilation and in the exchange of gases in the lungs. Laboratory tests indicate elevated CO2 levels, gradual reduction of the levels of oxygen and pH in arterial blood, and a consequent rise in the dead space fraction (DSF) of the lungs.

Objective: Patients with COPD exacerbation represent a large portion of those artificially ventilated. In an attempt to develop a prognostic tool for length of treatment, we compared the proportion of DSF to the length of mechanical ventilation (MV).

Methods: This study included 73 patients admitted to the intensive care unit (ICU) where they received MV due to exacerbation of COPD. Each patient’s arterial blood gases (ABG) were measured upon admission. PeCO2 was tested using a Datex S/5 instrument. Subsequently, DSF was calculated using the Bohr equation. Statistical data was analyzed using SPSS software.

Results: Patients included in the study were ventilated from 6 to 160 hours (average 40 ± 47). In addition to ABG measurements, PeCO2 (expired CO2) levels were measured and DSF calculated for each patient. DSF values varied from 0.21 to 0.76 (average 0.119 ± 0.489). No correlation was found between DSF and length of artificial ventilation.

Conclusion: Evaluation of DSF does not provide a factor in estimating the length of treatment for patients with acute respiratory failure due to COPD exacerbation.

Keywords: dead space, weaning, mechanical ventilation, COPD

Creative Commons License © 2009 The Author(s). This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.