Clinical trial NCT04760262: The Effect of Anesthesia on Cerebral Oxygenation
Official title: The Effect of Different Anesthesia Techniques on Cerebral Oxygenation in Thoracic Surgery
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: One-Lung Ventilation
Thoracic Surgery
Postoperative Cognitive Complications
Keywords: One-lung ventilation
cerebral oxygenation
postoperative cognitive dysfunction
sevoflurane
propofol
Lead sponsor: Karadeniz Technical University
Sponsor class: OTHER
First posted: 2021-02-18
Enrollment: 30
Sex: ALL
Minimum age (years): 18
Maximum age (years): 80
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: PROSPECTIVE
Sampling method: PROBABILITY_SAMPLE
Study population: Patients who would undergo thoracic surgery with one-lung ventilation (OLV)

Brief summary: One-lung ventilation (OLV) may cause negative changes in the oxygenation of cerebral tissue which results in postoperative cognitive dysfunction. The aim of this prospective study was to compare the potential effects of TIVA and inhalation general anesthesia techniques on cerebral tissue oxygenation and postoperative cognitive functions in patients receiving one-lung ventilation in thoracic surgery

Detailed description: One-lung ventilation (OLV) is a commonly used technique in thoracic surgeries. In thoracic surgeries performed with OLV, there may be changes in cerebral tissue oxygenation depending on both patient position and anesthetic technique. The effect of cerebral hypoxia on postoperative cognitive functions is controversially. Despite the ISPOCD1 study in which concluded that there were no relationship between the cerebral hypoxy and postoperative cognitive dysfunction (POCD) regional cerebral oxygen saturation decrements during surgery are listed among the POCD When OLV begins, alveolar hypoxia and arteriovenous shunt of deoxygenated blood occur in the dependant lung. And then, hypoxic pulmonary vasoconstriction (HPV) in non-ventilated lung segments occurs with increased mechanical stress. This event lead to significant physiological changes in cardiac output and pulmonary and systemic pressures In OLV, the propofol-based total intravenous anesthesia (TIVA) and inhalation general anesthesia techniques are frequently used. Recent studies have shown that unlike inhalational anesthetics, propofol does not suppress HPV, indeed increases it (Inhalational anesthetic agents reduce cardiac output more than oxygen consumption, causing a decrease in mixed venous partial pressure of oxygen, which stimulates hypoxic pulmonary vasoconstriction . Studies have shown significant reductions in cerebral oxygen saturation in thoracic surgery as a result of severe oxidative stress due to prolonged OLV and hypoxemia due to decreased functional residual capacity of the ventilated lung in the lateral decubitus position Cerebral oximetry is a method used to monitor the cerebral oxygen distribution-consumption balance and regional oxygen saturation (rSO2) in a limited area of the frontal cortex by noninvasively and continuously combining arterial and venous oxygen saturation signals of near-infrared spectroscopy (NIRS), which is a technique developed in the 1970s. Thanks to this method, perioperative physiological conditions, optimal tissue oxygenation and end-organ functions can be interpreted The aim of this prospective study was to compare the potential effects of TIVA and inhalation general anesthesia techniques on cerebral tissue oxygenation and postoperative cognitive functions in patients receiving one-lung ventilation in thoracic surgery

Eligibility criteria: Inclusion Criteria:

* Patients in American Society of Anesthesiology (ASA) classification I and II
* Patients who would undergo thoracic surgery with one-lung ventilation (OLV)
* thoracic surgeries with one-lung ventilation (OLV) that will take at least 45 minutes

Exclusion Criteria:

* Patients in ASA classification III and higher
* Emergency surgery
* Patients with known allergy to drugs used in the study
* Patients in New York Heart Association classification III-IV
* severe metabolic, renal, hepatic, central nervous system diseases, alcohol or drug addiction
* multiple trauma, coagulapathy, cerebral disease, dementia, hearing impairment and imperception
* severe obesity (a body mass index (BMI) of ≥ 35)
* patients with a peripheral oxygen saturation below 90 during one lung ventilation

Primary outcomes:
measure: Near Infrared Spectroscopy
timeFrame: Duration of surgery
measure: Mini mental state examination (MMSE)
timeFrame: 3 to 24 hours postoperative period
Secondary outcomes:
measure: mean arterial pressure
timeFrame: Duration of surgery
measure: heart rate
timeFrame: Duration of surgery
measure: bispectral index
timeFrame: Duration of surgery
Other outcomes:
Locations:
city: Trabzon
country: Turkey
facility: Karadeniz Technical University
Study officials:
References:
citation: Hood R, Budd A, Sorond FA, Hogue CW. Peri-operative neurological complications. Anaesthesia. 2018 Jan;73 Suppl 1:67-75. doi: 10.1111/anae.14142.
citation: Nakayama M, Murray PA. Ketamine preserves and propofol potentiates hypoxic pulmonary vasoconstriction compared with the conscious state in chronically instrumented dogs. Anesthesiology. 1999 Sep;91(3):760-71. doi: 10.1097/00000542-199909000-00029.
citation: Kazan R, Bracco D, Hemmerling TM. Reduced cerebral oxygen saturation measured by absolute cerebral oximetry during thoracic surgery correlates with postoperative complications. Br J Anaesth. 2009 Dec;103(6):811-6. doi: 10.1093/bja/aep309.
citation: Mahal I, Davie SN, Grocott HP. Cerebral oximetry and thoracic surgery. Curr Opin Anaesthesiol. 2014 Feb;27(1):21-7. doi: 10.1097/ACO.0000000000000027.
citation: Aguirre JA, Marzendorfer O, Brada M, Saporito A, Borgeat A, Buhler P. Cerebral oxygenation in the beach chair position for shoulder surgery in regional anesthesia: impact on cerebral blood flow and neurobehavioral outcome. J Clin Anesth. 2016 Dec;35:456-464. doi: 10.1016/j.jclinane.2016.08.035. Epub 2016 Oct 18.