The Effects of Positive Airway Pressure Ventilation during Cardiopulmonary Bypass on Pulmonary Function Following Open Heart Surgery

Intrapulmonary shunt as a result of atelectasis following cardiac surgeries is an important and common postoperative complication that results into pulmonary dysfunction typically lasting more than a week following surgery. Different methods have been provided to prevent these complications. In orde...

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Bibliographic Details
Published in:	Research in cardiovascular medicine Vol. 2; no. 2; pp. 79 - 84
Main Authors:	Alavi, Mostafa, Pakrooh, Behshid, Mirmesdagh, Yalda, Bakhshandeh, Hooman, Babaee, Touraj, Hosseini, Saeid, Kargar, Faranak
Format:	Journal Article
Language:	English
Published:	Iran Kowsar 01-05-2013 Wolters Kluwer Medknow Publications
Subjects:	Continuous Positive Airway Pressure; Coronary Artery Bypass Grafting; Cardiopulmonary Bypass Continuous Positive Airway Pressure Coronary Artery Bypass Grafting Cardiopulmonary Bypass
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Summary:	Intrapulmonary shunt as a result of atelectasis following cardiac surgeries is an important and common postoperative complication that results into pulmonary dysfunction typically lasting more than a week following surgery. Different methods have been provided to prevent these complications. In order to prevent postoperative pulmonary complications, investigation of the effectiveness of continuous positive airway pressure (CPAP) and intermittent mandatory ventilation (IMV) during cardiopulmonary bypass (CPB) in patients undergoing coronary artery bypass grafting (CABG). In this prospective interventional study, 300 patients, candidate for elective CABG (On-Pump), were randomly allocated to 3 groups: A, B, C. Group A (CPAP) patients received CPAP at 10 cm H2O during CPB. Group B (IMV) patients received IMV with a tidal volume of 2 cc/kg and respiratory rate of 15/min and group C (control) patients did not receive any type of ventilation during CPB. Other procedures were similar between groups. Arterial blood samples were taken at 8 moments and arterial blood gas (ABG) analysis were compared between groups. Chest x-rays after CABG were also evaluated with respect to atelectasis. The demographic data were similar in between three groups. Graft number, pump time and preoperative ABGs were not significantly different. Postoperative PaO2 were significantly higher in the CPAP and IMV groups and (A-a) DO2 were significantly lower in these two groups, compared to the control group. In the present study, applying positive airway pressure methods (CPAP or IMV) during CPB was associated with better postoperative ABG measurements and (A-a) DO2.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2251-9572 2251-9580
DOI:	10.5812/cardiovascmed.8129