Low-flow anesthesia (LFA) is a technique in which at least 50% of the exhaled air, after carbon dioxide absorption, is mixed with a certain amount of fresh gas and returned to the patient during the next inspiration. In 1974, R. Virtue defined minimal flow anesthesia (MFA) as 0.5 L/min. In 1984, Baker and Simionescu classified LFA as 0.5-1 L/min and MFA as 0.25-0.5 L/min. The aim of this study is to investigate whether there are hemodynamic differences between open-heart surgery cases performed with LFA at different fresh gas flow rates.
Study Type
OBSERVATIONAL
Enrollment
80
Gazi University Faculty of Medicine
Ankara, Turkey (Türkiye)
RECRUITINGphysiological parameter ; heart rate
Heart rate will be recorded every 10 minutes, expressed as beats per minute, starting before induction and including the sternotomy and pericardiotomy periods.
Time frame: Intraoperatively
physiological parameter; systolic/diastolic blood pressure
Systolic and diastolic blood pressure will be recorded every 10 minutes in mmHg, starting before induction and including the sternotomy and pericardiotomy periods.
Time frame: Intraoperatively
physiological parameter; SpO2
SpO2 will be recorded as a percentage every 10 minutes, starting before induction and including the sternotomy and pericardiotomy periods.
Time frame: Intraoperatively
Monitoring parameter; Bispectral Index (BIS)
The BIS value will be recorded numerically every 10 minutes, starting from before induction and including the sternotomy and pericardiotomy periods.
Time frame: Intraoperatively
Monitoring parameter; Minimum alveolar concentration (MAC)
The MAC value will be recorded numerically every 10 minutes, starting from before induction and including the sternotomy and pericardiotomy periods.
Time frame: Intraoperatively
Preoperative data; ASA (American Society of Anesthesiologists) classification
During the preoperative period, preoperative data, including the American Society of Anesthesiologists (ASA) Physical Status Classification, will be recorded. The ASA classification is used to assess the patient's preoperative physical status and perioperative risk, with higher ASA classes (I-IV) indicating increased systemic disease severity and perioperative risk.
Time frame: 24 hours before surgery
Preoperative data
In the preoperative period, the degree of valve dysfunction (such as I.degree TY, II.degree MY) of the patients will be recorded.
Time frame: 24 hours before surgery
Preoperaitive data
In the preoperative period, the patient's ejection fraction will be recorded as a percentage.
Time frame: 24 hours before surgery
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.