a Study Conducted About a New Mode of Ventilation in Laparoscopic Surgeries


All India Institute of Medical Sciences, Rishikesh




Lung Injury, Acute


Other: inverse ratio ventilation

Study type


Funder types




Details and patient eligibility


Carbon dioxide insufflations of abdomen are integral part of laparoscopic operations in minimally invasive surgery era. It does cause splinting effect on diaphragm movement and set it high inside thoracic cavity too. In turn it will be associated with increase in peak and plateau airway pressure during positive pressure ventilation. Inverse ratio ventilation has been shown to improve lung compliance and restrict the peak and plateau airway pressure and should be useful as one of the lung protective ventilation method to improve respiratory outcome in laparoscopy surgery.

Full description

Anaesthesiologists have been ventilating patients in the perioperative period with relatively large tidal volumes (10-15 ml/kg ideal body weight) to prevent intraoperative atelectasis. Ventilating patient with large tidal volumes may be a risk factor for development of lung injury.During surgical procedures, both general anesthesia and high tidal volumes may strain non injured lungs and trigger inflammation. High tidal volumes that cause alveolar overstretching can contribute to extra pulmonary organ dysfunction through systemic release of inflammatory mediators. Recently protective lung ventilation strategies has been reported to be useful to reduce the respiratory complications in postoperative period. The use of small tidal volume (Vt), positive end-expiratory pressure (PEEP) and restricting peak airway pressure have shown reduced incidence of ventilation induced lung injury. It has been shown that a small tidal volume (VT) and PEEP can reduce the incidence of postoperative lung dysfunction and improve intraoperative oxygenation. Restricting peak airway pressure can be achieved by inverse ratio ventilation. Minimizing the risk of ventilator-induced lung injury (VILI), improving oxygenation and alveolar recruitment are all advantages of inverse ratio ventilation. However, the potential utility of pressure controlled inverse ratio ventilation (PCIRV) has not been studied in patients undergoing general anaesthesia. Investigators hypothesized that in patients with normal lungs scheduled for general anesthesia, PIV might prevent lung function deterioration and lung morphological alterations. Investiagators aim was to compare the intraoperative protective ventilation strategies on oxygenation/ ventilation and postoperative lung dysfunction and lung injury among patients undergoing laparoscopic upper abdominal surgery.


128 patients




18 to 60 years old


No Healthy Volunteers

Inclusion criteria

  • Age 18-60 years
  • ASA- I and II
  • Patients undergoing laparoscopic upper abdominal surgery

Exclusion criteria

  • Significant pulmonary disease
  • Significant cardiac dysfunction
  • BMI>30 kg/m2

Trial design

Primary purpose




Interventional model

Parallel Assignment


Triple Blind

128 participants in 2 patient groups

intervention group
Experimental group
in this group of patients, inverse ratio ventilation is provided during general anaesthesia
Other: inverse ratio ventilation
control group
No Intervention group
in this group of patients, conventional ventilation is provided during general anaesthesia

Trial contacts and locations



Data sourced from clinicaltrials.gov

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