Investigation of the Effectiveness of Lung Ultrasonography in Intraoperative Fluid Management

Lung ultrasound score (LUS) Lung ultrasonography; Lung ultrasound score will be created by performing ultrasonography in 4 quadrants according to the previously defined protocol.

0 points indicated the presence of only A lines, less than 2 B lines

• point indicated 1-2 B lines
• points indicated the presence of more than 3 well-spaced B lines;
• points indicated the presence of combined B lines

Pulse variable index (PVI) will be measured by finger pulse oximetry with the MASİMO device.

Central venous pressure(CVP)

Pressure values measured by a central venous catheter applied by jugular or subclavian route

hypoxia (partial oxygen pressure below 95 on pulse oximetry and 10% decrease from the initial value) atelectasis

glomerular filtration rate (GFR) values normal results range from 90 to 120 mL/min/1.73 m2.

Blood urea nitrogen value mg/dl

Blood creatinine value mmol/dl

End-Tidal Carbon Dioxide Pressure mm/hg The partial pressure of CO2 detected at the end of exhalation is between 35 and 45 mm Hg or 4.0 to 5.7 kPa.

Peak inspiratory pressure Values Peak inspiratory pressure is the highest pressure applied to the lungs during inhalation and should be kept below 35 cmH2O.It is automatically measured by respirators.

Tidal Volume value Tidal volume is the volume of gas moving into and out of the lungs with each breath. Normal tidal volume is 6 to 8 mL/kg, regardless of age. It is automatically measured by respirators.