Assuming that the basic reliability of dynamic indices will increase with the application of functional hemodynamic tests after sternotomy and protective lung ventilation in patients undergoing elective coronary artery bypass surgery, it is useful to predict fluid responsiveness after sternotomy in coronary artery bypass surgery patients ventilated with 6 ml/kg PBW (ideal body weight). We aimed to reveal the sensitivity and specificity of PPV and SVV changes by applying a lung opening maneuver.

In order to evaluate the fluid deficit in patients undergoing coronary artery bypass surgery, researchers will measure stroke volume index, cardiac index and mean arterial pressure while the patients are in the lima position.

Then researchers will perform a lung opening maneuver (30mmHg for 30 seconds) and measure again.

researchers will measure again after the values return to normal. researchers will give patients balanced fluid at 3ml/kg and record their values.

Can researchers predict fluid response with lung opening maneuver?

• Inclusion Criteria:
• 1-ASA2-3 patients between the ages of 18-80 who will undergo elective coronary bypass surgery under general anesthesia
• Exclusion Criteria:
• 1. Be younger than 18 years old, be over 80 years old
• 2. Patients with an ASA score greater than 3
• 3. EF<40%
• 4. Those with contraindications to anesthetic drugs
• 5. Patients with BMI>30
• 6. Patients who did not want to participate in the study
• 7. Right ventricular dysfunction
• 8. COPD(Chronic obstructive pulmonary disease)
• 9. Bullous lung disease
• 10. Moderate to severe PHT
• 11. Severe kidney or liver disease
• 12. Patients with hemodynamic instability in the perioperative period
• 13. Pregnancy

ASA2-3 patients between the ages of 18-80 who will undergo elective coronary bypass surgery under general anesthesia

fluid responsiveness