ORIGINAL ARTICLE
Year : 2019  |  Volume : 13  |  Issue : 1  |  Page : 40-45

Respiratory mechanics with volume-controlled auto-flow ventilation mode in cardiac surgery*


1 Department of Anesthesiology and Reanimation, Intensive Care Unit, Medical School, Ege University, Izmir, Turkey
2 Department of Anesthesiology and Reanimation, Medical School, Dokuz Eylül University, Izmir, Turkey
3 Division of Anesthesiology and Reanimation, Medicalpark Hospital, Izmir, Turkey
4 Division of Anesthesiology and Reanimation, Gaziemir Nevvar Salih İşgören State Hospital, Izmir, Turkey

Correspondence Address:
Prof. Şule Özbılgın
Department of Anesthesiology and Reanimation, Faculty of Medicine, Dokuz Eylul University, İzmir
Turkey
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/sja.SJA_615_18

Rights and Permissions

Aim: We aimed to investigate the changes in respiratory mechanics in adult patients undergoing open heart surgery (OHS) while using volume-controlled auto-flow (VCAF) ventilation mode. Materials and Methods: After obtaining ethics committee's approval and informed consent, 30 patients (17 males and 13 females; mean age: 57.3 ± 17.0 years; mean weight; 74.9 ± 13.6 kg) scheduled for OHS were enrolled. Mechanical ventilation was carried out using VCAF mode (VT: 5–8 mL/kg, I/E: 1/2, 10 ± 2 fr/min). Values of dynamic compliance (Cdyn) and resistance (R) were obtained at six time points (TPs). Normally distributed variables were analyzed with repeated measure of analysis of variance and Bonferroni tests. For abnormally distributed variables, Friedman variance analysis and Wilcoxon signed-rank tests were used. Values were expressed as mean ± standard deviation. P value <0.05 was considered significant. Results: Cdyn (mL/mbar) and R (mbar/L/s) values were as follows – (1) before sternotomy (S): 49.9 ± 17.1 and 7.8 ± 3.6; (2) after S: 56.7 ± 18.3 and 7.1 ± 3.7; (3) after S and after sternal retractor placement: 48.7 ± 16.1 and 8.3 ± 4.4; (4) after weaning from cardiopulmonary bypass and following decannulation while retractor was in place: 49.6 ± 16.5 and 8.1 ± 4.0; (5) after retractor removal: 56.5 ± 19.6 and 7.4 ± 3.7; and (6) after sternal closure: 43.1 ± 14.2 and 9.6 ± 9.1, respectively. Significant differences were observed in Cdynand R between; first and second TPs, second and third TPs, fourth and fifth TPs, and fifth and sixth TPs. Also, significant difference in Cdynwas found between first and sixth TPs, but it was not found in R. Conclusion: Cdyndecreases, but R remains the same in cardiac surgical patients when mechanical ventilation is performed with VCAF ventilation mode. Additionally, Cdynis negatively affected by the presence of sternal retractor and the sternal closure in OHS.


[FULL TEXT] [PDF]*
Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)
 

 Article Access Statistics
    Viewed92    
    Printed1    
    Emailed0    
    PDF Downloaded9    
    Comments [Add]    

Recommend this journal