Applying intraoperative lung protective ventilation1

Globally, more than 200 million patients undergo general anaesthesia and receive mechanical ventilation every year. Overall, General anaesthesia is an effective method for enabling surgical procedures. Mechanical ventilation is an essential support during general anaesthesia, but sometimes it may contribute to impaired respiratory function.


Protective ventilation strategies have been used in critical care medicine and can be translated to the operating room with the aim of improving postoperative outcomes. Growing evidence suggests that prophylactic lung protective ventilation strategies, using low tidal volumes, individualized positive end expiratory pressure (PEEP) and recruitment manoeuvres (RMs) as appropriate, can minimize the incidence of postoperative pulmonary complications (PPCs).¹

1Futier E, et al. A trial of intraoperative low-tidal-volume ventilation in abdominal surgery. New England Journal of Medicine. 2013; 369(5): 428-437.

https://www.nejm.org/doi/full/10.1056/NEJMoa1301082

Vital Capacity and Cycling

It is well known that atelectasis occurs during general anaesthesia and can persist postoperatively, contributing to significant post-operative complications with additional healthcare costs.2

Recruitment maneuvers (RMs) are intended to open collapsed alveoli by applying transient increases in transpulmonary pressure. Until now, this has been delivered manually by the caregiver during the case. The Aisys CS2 and Avance CSCarestations introduce two lung ventilation procedures to help caregivers in dealing with atelectasis.  

Vital Capacity procedure automates the manual bag ‘squeeze and hold.'  PEEP can be programmed at the end of the procedure  thus helping to prevent derecruitment.

Cycling is a tool that allows the clinician to design a lung mechanics manoeuvre, to stepwise increase and decrease PEEP in programmable increments or decrements, during mechanical ventilation, with the aim of helping the clinician reopen the alveoli and keep them open.

2.  Magnusson L, Spahn DR. New concepts of atelectasis during general anaesthesia. Br J Anaesth. 2003; 91(1): 61-72.

https://academic.oup.com/bja/article/91/1/61/276054

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