Document Detail

Tidal lung recruitment and exhaled nitric oxide during coronary artery bypass grafting in patients with and without chronic obstructive pulmonary disease.
MedLine Citation:
PMID:  21952833     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: We studied the occurrence of intraoperative tidal alveolar recruitment/derecruitment, exhaled nitric oxide (eNO), and lung dysfunction in patients with and without chronic obstructive pulmonary disease (COPD) undergoing coronary artery bypass grafting (CABG).
METHODS: We performed a prospective observational physiological study at a university hospital. Respiratory mechanics, shunt, and eNO were assessed in moderate COPD patients undergoing on-pump (n = 12) and off-pump (n = 8) CABG and on-pump controls (n = 8) before sternotomy (baseline), after sternotomy and before cardiopulmonary bypass (CPB), and following CPB before and after chest closure. Respiratory system resistance (R (rs)), elastance (E (rs)), and stress index (to quantify tidal recruitment) were estimated using regression analysis. eNO was measured with chemiluminescence.
RESULTS: Mechanical evidence of tidal recruitment/derecruitment (stress index <1.0) was observed in all patients, with stress index <0.8 in 29% of measurements. Rrs in on-pump COPD was larger than in controls (p < 0.05). Ers increased in controls from baseline to end of surgery (19.4 ± 5.5 to 27.0 ± 8.5 ml cm H(2)O(-1), p < 0.01), associated with increased shunt (p < 0.05). Neither Ers nor shunt increased significantly in the COPD on-pump group. eNO was comparable in the control (11.7 ± 7.0 ppb) and COPD on-pump (9.9 ± 6.8 ppb) groups at baseline, and decreased similarly by 29% at end of surgery(p < 0.05). Changes in eNO were not correlated to changes in lung function.
CONCLUSIONS: Tidal recruitment/derecruitment occurs frequently during CABG and represents a risk for ventilator-associated lung injury. eNO changes are consistent with small airway injury, including that from tidal recruitment injury. However, those changes are not correlated with respiratory dysfunction. Controls have higher susceptibility to develop complete lung derecruitment.
Alysson R Carvalho; Fumito Ichinose; Ivany A Schettino; Dean Hess; Javier Rojas; Antonio Giannella-Neto; Arvind Agnihotri; Jennifer Walker; Thomas E MacGillivray; Marcos F Vidal Melo
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Publication Detail:
Type:  Journal Article     Date:  2011-09-28
Journal Detail:
Title:  Lung     Volume:  189     ISSN:  1432-1750     ISO Abbreviation:  Lung     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-11-21     Completed Date:  2012-03-20     Revised Date:  2014-04-08    
Medline Journal Info:
Nlm Unique ID:  7701875     Medline TA:  Lung     Country:  United States    
Other Details:
Languages:  eng     Pagination:  499-509     Citation Subset:  IM    
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MeSH Terms
Aged, 80 and over
Breath Tests
Case-Control Studies
Coronary Artery Bypass*
Exhalation / physiology*
Heart Diseases / surgery
Lung / physiopathology
Middle Aged
Nitric Oxide / metabolism*
Prospective Studies
Pulmonary Disease, Chronic Obstructive / metabolism*,  physiopathology*
Pulmonary Gas Exchange / physiology
Regression Analysis
Respiratory Mechanics / physiology*
Retrospective Studies
Stress, Physiological / physiology
Tidal Volume / physiology
Reg. No./Substance:
31C4KY9ESH/Nitric Oxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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