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01.12.2011

Tidal Lung Recruitment and Exhaled Nitric Oxide During Coronary Artery Bypass Grafting in Patients With and Without Chronic Obstructive Pulmonary Disease

verfasst von: 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

Erschienen in: Lung | Ausgabe 6/2011

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Abstract

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 H₂O⁻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.

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Titel: Tidal Lung Recruitment and Exhaled Nitric Oxide During Coronary Artery Bypass Grafting in Patients With and Without Chronic Obstructive Pulmonary Disease
verfasst von: 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
Publikationsdatum: 01.12.2011
Verlag: Springer-Verlag
Erschienen in: Lung / Ausgabe 6/2011
Print ISSN: 0341-2040
Elektronische ISSN: 1432-1750
DOI: https://doi.org/10.1007/s00408-011-9325-0

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