Effects of Prone Positioning on Transpulmonary Pressures and End-expiratory Volumes in Patients without Lung Disease

May 29, 2018 by Dr. Clemens Leave a Comment

Methods: We studied 16 patients undergoing spine surgery during general anesthesia and neuromuscular blockade. We measured airway pressure, esophageal pressures, airflow, and volume, and calculated the expiratory reserve volume and the elastances of the lung and chest wall in supine and prone positions.Results: Esophageal pressures at end expiration with 0 cm H₂O PEEP decreased from supine to prone by 5.64 cm H₂O (95% CI, 3.37 to 7.90; P < 0.0001). Expiratory reserve volume measured at relaxation volume increased from supine to prone by 0.15 l (interquartile range, 0.25, 0.10; P = 0.003). Chest wall elastance increased from supine to prone by 7.32 (95% CI, 4.77 to 9.87) cm H₂O/l at PEEP 0 (P < 0.0001) and 6.66 cm H₂O/l (95% CI, 3.91 to 9.41) at PEEP 7 (P = 0.0002). Median driving pressure, the change in airway pressure from end expiration to end-inspiratory plateau, increased in the prone position at PEEP 0 (3.70 cm H₂O; 95% CI, 1.74 to 5.66; P = 0.001) and PEEP 7 (3.90 cm H₂O; 95% CI, 2.72 to 5.09; P < 0.0001).

Conclusions: End-expiratory esophageal pressure decreases, and end-expiratory transpulmonary pressure and expiratory reserve volume increase, when patients are moved from supine to prone position. Mean respiratory system driving pressure increases in the prone position due to increased chest wall elastance. The increase in end-expiratory transpulmonary pressure and expiratory reserve volume may be one mechanism for the observed clinical benefit with prone positioning.

Leave a Reply Cancel reply

You must be logged in to post a comment.

Call (660) 596-2224

What people thought about us

“As Director of Surgical Services Departments there has been considerable changes have occurred in my department and Anesthesia Experts has always risen to meet our demands of our facility. They have been very pro-active in meeting the increase volumes allowing us to keep our surgeons and patients very satisfied with our services.”

AR BSN 346 beds AL

“Before AE took over the anesthesia department was described by the surgeons as the worst in the history of our hospital. The prior management company was having a cancelled surgery per day. I am happy to report there has not been one since they have taken over the department. Additionally we have seen a 905 reduction if requested preop
lab tests. The anesthesia department is now the very best hospital department in our entire facility.”

DS CEO 272 beds MS

“Anesthesia Experts has provided consistent anesthesia providers who display a high degree of integrity, responsibility and professionalism. They have become a more valuable part of our facility and community.”

LR CEO 150 beds TX

“Even though they are physically located 1000 miles away Anesthesia Experts just does not provide great anesthesia coverage they personally engage surgeons to increase their business. Last year my surgical volume rose by 24% and we are currently 50% ahead of last year and all of that growth is organic.”

JE FACHE CEO AL 92 bed hospital

“Anesthesia Experts is more responsive than anyone I have dealt with. They are available by phone whenever needed and will be on site for any need or request and has been on site to address issues before we can make the request.”

SW CEO 25 beds NM

“While problems are extremely rare when they do occur Anesthesia Experts quickly and professionally implements a solution. Our surgical volume has grown over 100 cases per month and now our GI docs want to perform all of their endoscopies in our hospital instead of their GI lab that they own!”

SP CEO 346 beds AL

“Our anesthesia department was a thorn in my side that kept me awake at night. Anesthesia Experts swept in and brought order to our mess and our department was quickly redirected.”

JAM CNO AL 89 bed hospital