It is aimed to investigate the effect of flow controlled ventilation on intraoperative respiratory parameters and hemodynamic parameters in laparoscopic operations.

Study will begin after ethics committee approval and the patient's written and verbal consent .

Prospective observational studies will be conducted on patients over the age of 18 who will undergo laparoscopic surgery in the operating rooms. Patients who did not give verbal and written consent, emergency interventions, patients at risk of aspiration, patients with an ASA physical status above 3 and a diagnosis of COPD will be excluded.

Patients will be randomized and divided into two groups. Patients intraoperatively ventilated with a conventional ventilator (GE™ Avance™ CS2, VCV mode) Group 1, intraoperative ventilation Ventinova ( Evone®, Ventinova Medical, Eindhoven, the Netherlands, FCV mode) will be referred to as Group 2. Standard monitoring (ECG; SpO2, end tidal CO2,arterial blood pressure) will be applied to all patients. Anesthesia induction will be performed with propofol, fentanyl, rocuronium bromide as standard; In addition, anesthesia maintenance of the patients will be provided with propofol and remifentanil.

Respiratory parameters such as peripheral SpO2, PaCO2 value, peak airway pressure of each group will be recorded, and intraoperative hemodynamic parameters (systolic, diastolic, mean blood pressure, heart rate) of each group will be monitored and recorded.

Postoperative respiratory functions and length of hospital stay of all patients will be monitored and recorded.

Inclusion Criteria: patients who will undergo laparoscopic surgeries, ASA 1,2,3 physical status

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Exclusion Criteria:

• patients who do not give verbal and written consent, emergency interventions, patients at risk of aspiration, patients with an ASA physical status above 3 and a diagnosis of COPD