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

Study Overview
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Brief Summary
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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.

Detailed Description
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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.

Official Title
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A Prospective Randomized Study of Effect if Lung Protective Ventilation by Reducing Airway Pressure During Laparoscopic Surgery

Conditions
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Lung Injury, Acute

Intervention / Treatment
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* Other: inverse ratio ventilation


Participation Criteria
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Eligibility Criteria
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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

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: intervention group<br>in this group of patients, inverse ratio ventilation is provided during general anaesthesia | Other: inverse ratio ventilation<br>* during general anaesthesia in laparoscopic surgeries, this group of patients will receive inverse ratio ventilation with proper observation of hemodynamics<br>|
| No Intervention: control group<br>in this group of patients, conventional ventilation is provided during general anaesthesia | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| change in partial pressure of oxygen from baseline | Investigators assume that in laparoscopic surgeries inverse ratio ventilation can be used to decrease the airway pressures | upto 1 day postoperatively | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| changes in pulmonary function tests from baseline | Investigators assume that the pulmonary function tests will be improved as we ventilate with inverse ratio ventilation as a protective lung strategy | upto 3 days postoperatively |