View clinical trials related to Anesthesia, General.
Filter by:General anesthesia often reduces blood pressure whereby blood flow to the brain and other vital organs may become insufficient. Thus, medicine is often administered to maintain blood pressure but it is unclear at what level blood pressure should be aimed at during anesthesia. Thirty patients undergoing major abdominal surgery will be included. The study will start one hour after the start of surgery and lasts for approximately half an hour. The purpose of the study is to evaluate whether blood flow to the brain can be increased by maintaining blood pressure at a higher level than that used in clinical practice. In the study, MAP is adjusted to a high, moderate, and low level for a short time. The low level of blood pressure used in the study, corresponds to the level aimed at in clinical practice. The drug noradrenaline will be used to control blood pressure. Blood flow to the brain will be evaluated on the neck using ultrasound.
The evaluation of the anesthetic depth monitoring using PLE (Phase Lag Entropy) during propofol anesthesia
Different pain assessment methods have been proposed to evaluate analgesic efficacy after surgical operation. Pain is a subjective phenomenon. Patient did his pain self assessment. But, cooperation of the patient is limited by cultural differences, language barriers or residual effect of products used while general anesthesia. A lot of study were conducted to demonstrate and to quantify the pain after an operation. The aim will be dose analgesic treatment better without cooperation of the patient. This sudy concerns patients on the post anesthesia care units one hour after their arrival. They will have electrocardiogram and video-pupillometer.
The purpose of this study is to evaluate prospectively ventilatory practices in the perioperative cardiac surgery period.
The use of 100% oxygen during the induction of general anesthesia is always preferable to have enough time to secure the airway by endotracheal intubation, because preoxygenation with a low oxygen concentration may reduce the safe time for apnea. However, using a low oxygen concentration during preoxygenation might prevent the formation of atelectasis. There is still no clear conclusion about the best oxygen concentration for preoxygenation. Our study is designed to evaluate the safety of preoxygenation with 80%, 60%, 40%, 30% and 21% oxygen by the safe time for apnea during the induction of general anesthesia.
Surgical repair of hip fractures may be performed with various anesthetic techniques, but are most commonly completed under general anesthesia (GA) or neuraxial anesthesia (NA). Numerous prospective and retrospective studies demonstrate improved morbidity and mortality when NA is used; however, many surgeons prefer the use of GA with neuromuscular blockade (NMB) due to the perception of better operative conditions. This study aims to compare the operative conditions obtained from the use of combined GA and spinal with NMB vs. the use of GA with spinal without NMB. 84 patients will all receive a single shot spinal and GA and then will be randomized to receive either NMB or placebo. The fracture reduction time will be measured.
This is a single-center prospective randomized control trial (RCT) to determine whether the continuous monitoring of the plethysmographic variability index (PVI) during low-risk surgeries, can be used to optimize the intraoperative fluid administration. Low-risk patients that attend our day surgery unit, and who will be operated under general anesthesia, will be randomized to either a liberal fluid group, a restrictive fluid group or a dynamic monitoring group (PVI-directed). The amount of fluid infused together with the time to discharge, will be assessed in each participant during the postoperative period along with additional secondary outcomes.
In pediatric cardiac patients with shunt dependent pulmonary circulation, Qp/Qs ratio is a important parameter indicating the balance of pulmonaty and systemic circulation. This study will calculate Qp/Qs using variables measured using non-invasive monitors (cerebral oximeter and pulse oximeter). This value will be compared with Qp/Qs calculated using variables obtained from blood sample.
The purpose of this study is to evaluate whether carotid Doppler peak systolic velocity can be an easy to measure possible surrogate for echocardiographic measurement of aortic peak systolic velocity variation which is an index of fluid responsiveness in mechanically ventilated children intra-operatively.
Low-tidal volume ventilation is arising as a tool to optimize the ventilatory management and to improve clinical outcome in patients undergoing general anesthesia for abdominal surgery. A recent large randomized controlled trial failed to detect a significant difference between two different approaches for ensuring adequate lung recruitment (PEEP=12 cmH2O + scheduled recruiting maneuvers vs. PEEP 2 cmH2O) during protective ventilation. Thus, in patients undergoing open abdominal surgery and receiving low-tidal volumes, the effects of different positive end-expiratory pressure (PEEP) levels and recruiting maneuvers remain to be established. Design: prospective, cross-over, physiological trial. PURPOSE To assess the physiological effects of different PEEP levels with or without scheduled recruiting maneuvers in patients undergoing general anesthesia for open abdominal surgery and receiving low-tidal volume ventilation.