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231 active trials for Anesthesia

Drug Concentration and Volume on Adequate Labor Analgesia With PIEB

Neuraxial labor analgesia is performed by the administration of a local anesthetic/opioid mixture in the epidural space. The delivery method is a combination of continuous infusion, provider-administered boluses and patient-administered boluses (patient controlled epidural analgesia [PCEA]) via epidural catheter. Pain during the first stage of labor is primarily due to lower uterine segment and cervical stretching. The pain signals enter the spinal cord through sensory nerves at the T10 through L1 dermatomes. Pain signals from the late first state and second stage of labor also arise from the vagina and perineum. These signals travel with the pudendal nerve and enter the spinal cord at S2-S4. Thus, the anesthetic solution administered through the lumbar epidural catheter must spread cephalad in the epidural space to reach the T10 nerve roots and spinal cord, and must spread caudad to reach the caudal nerve roots in the epidural space. The optimal method for maintaining labor analgesia is unknown. Several studies have demonstrated that PIEB, in combination with PCEA, provide superior maintenance of labor analgesia (less need and longer time to provider intervention, lower local anesthetic consumption, less motor block, and improved patient satisfaction scores) than maintenance with a continuous infusion with PCEA.The mechanism for this difference is not known; however, one suggested mechanism is improved spread of the local anesthetic within the epidural space. Kaynar et al. injected methylene blue dye through a multi-orifice catheter using either a continuous infusion or intermittent bolus and the area of diffusion was measured on a piece of paper. The authors found that intermittent boluses were associated with a greater surface area of diffusion than continuous infusion. In a cadaver study, dye was injected into the lumbar epidural space, and cryomicrotome sections were taken.Dye flowed in rivulets through small channels in the epidural space, as opposed to moving as a unified front. The authors found dye injected at high pressures had more uniform spread through the epidural space, supporting the concept of intermittent epidural injection providing superior analgesia. Epidural infusion pumps capable of delivering PIEB of local anesthetic with PCEA have become commercially available and many studies have attempted to assess the optimal parameter settings (including volume of programmed bolus, bolus interval, rate of bolus administration) to provide superior labor analgesia. Recently we completed a double-blinded randomized control trial evaluating two bolus delivery rates, hypothesizing that those patients randomized to receive higher bolus delivery rates would have improved labor analgesia. However, no difference was found between groups.What is more, both groups had a mean cephalad sensory level to cold of T6. This sensory level is higher than the traditional goal of T10 (upper dermatome level of uterine innervation), but despite the adequate sensory level, a large number of patients required supplemental physician-delivered boluses of local anesthetic during labor. Forty percent of the women in the high-rate group and 36% of the low-rate group required a manual re-dose during labor. This suggests that either a higher volume, or higher concentration of local anesthetic (i.e., higher dose) is needed to maintain adequate labor analgesia. Traditionally higher concentration local anesthetic solutions have been associated with increased motor blockade leading to a higher incidence of instrumental vaginal delivery. Several local anesthetic solutions with varying drug concentrations are available for labor analgesia and are used clinically in the United States. We plan to perform a randomized, controlled, double-blind study to test the hypothesis that patients whose labor analgesia is maintained using PIEB with low-volume bolus (6.25 mL) of a higher local anesthetic concentration solution (0.1% bupivacaine with fentanyl 2.0 mcg/mL) will require less supplemental analgesia (manual provider re-doses) than patients whose PIEB is delivered with a high-volume bolus (10 mL) of lower density local anesthetic solution (0.0625% bupivacaine with fentanyl 2.0 mcg/mL). The aim of this study is to evaluate the association between bolus volume and concentration of local anesthetic during maintenance of labor analgesia with programmed intermittent epidural bolus (PIEB) analgesia. The hypothesis of this study is: patients whose labor analgesia is maintained using PIEB with low-volume bolus (6.25 mL) of higher local anesthetic concentration solution (0.1% bupivacaine with fentanyl 2.0 mcg/mL) will have a longer duration of adequate analgesia (time to first manual re-dose request) than patients whose PIEB is delivered with a high-volume bolus (10 mL) of lower concentration local anesthetic solution (0.0625% bupivacaine with fentanyl 2.0 mcg/mL).

Start: January 2020

Effect of Opioid Free Anesthetic on Post-Operative Opioid Consumption After Laparoscopic Bariatric Surgery

A comparison of post-operative opioid use in laparoscopic bariatric surgery patients receiving opioid or opioid-free anesthesia.

Start: December 2019

Observational Prospective Study on Behavioral Outcomes of Children With Autism Spectrum Disorder (ASD) in Comparison to Those Without Neurodevelopmental Diagnoses

Autism Spectrum Disorder (ASD) is the fastest growing neurodevelopmental disorder in the world. Approximately 1% of the population worldwide is affected by this disorder. Children with ASD exhibit some very stereo-typical behaviors. Their daily functionality depends on very rigid and predictable schedules and routines. Any changes in their schedules can often trigger negative emotional outbursts. The need to come to the hospital for procedures can be one such trigger. The purpose of this study is to examine the post anesthesia behavior outcomes of children with ASD.

Start: February 2016

A Randomized, Double-Masked, Controlled, Single Site Investigator Initiated, Exploratory Study of the Midazolam/Ketamine Melt vs Ketamine Melt Alone vs Midazolam Melt Alone in Subjects Undergoing Intraocular Surgery.

This study is designed to explore the sedative and analgesic effectiveness of the Midazolam/Ketamine melt compared to Midazolam melt alone or Ketamine melt alone in subjects undergoing intraocular surgery.

Start: January 2021

Effects of Anesthetic Technique on NK Cells

The proposed study is a pilot prospective, single-blinded, randomized controlled trial evaluating the effects of two routine, standard-of-care, anesthetic techniques on natural killer cell population size and cytotoxicity in patients undergoing exploratory abdominal laparotomies.

Start: July 2019

A Prospective Cohort Study of Perioperative Covert Stroke and Postoperative Cognitive Dysfunction

With the development of population aging, the incidence of covert stroke and cognitive dysfunction gradually increased. Currently, there is still lack of prospective cohort study with large sample size on the relationship between perioperative covert stroke and postoperative cognitive dysfunction. The investigators will perform a prospective cohort study. The aim of the study is to determine whether there is an association between perioperative covert stroke and postoperative cognitive dysfunction in elderly patients undergoing noncardiac surgery.

Start: May 2018

Delirium in Elderly Patients With Trauma of the Hip

A broken hip occurs frequently in elderly patients and is often very painful. Side effects of inadequately treated pain as well as the traditional drugs (administered through intravenous catheter) used to treat pain are, among others, a confusional state, called delirium. When pain medication is administered locally, only around the hip joint, pain might be treated more effectively and these side effects could be prevented. This is called a nerve block. The current study evaluates the use of a continuous nerve block throughout the complete hospital admission with a catheter around the hip joint versus the use of traditionally used pain medication administered though an intravenous catheter in elderly patients with a broken hip. Half of all patients will receive the nerve block while in the emergency department and the other half will receive pain medication through the intravenous access.

Start: May 2016

Effect of Fatigue on Regional Anaesthesia Task

The adverse effects of sleep related fatigue are significant, impacting on doctors' health, wellbeing, performance and ultimately their safety and that of their patients'. Trainees are at an increased risk of fatigue because they routinely, and are increasingly, working long hours, and exposed to excessive and high intensity workloads. With increasing numbers of patient consultations, there is a higher risk of making poorer quality clinical decisions (i.e. decision fatigue). The excessive workloads experienced by doctors can cause fatigue through the requirement for sustained attention over long periods of time, particularly when performing complex and mentally demanding tasks. Our main objective is to study the difference between the fatigued and non-fatigued state of anaesthetists and on their ability to perform an ultrasound-guided peripheral nerve blockade task. We hypothesise that fatigue will result in a clinically significant reduction in the objective structured assessment scores of anaesthetists who are performing an ultrasound-guided peripheral nerve blockade task compared to their scores when they are non-fatigued.

Start: February 2021

Effect of the Duration of Pre-oxygenation on Apnea Tolerance in Obese Patients During the Induction of General Anesthesia

The occurrence of arterial oxygen desaturation (hypoxemia) during the induction of general anesthesia remains one of the main causes of complications and mortality in anesthesia. In a healthy patient breathing in ambient air [Inspired O2 fraction (FiO2) = 21%] before the onset of narcosis, a drop in arterial O2 saturation (SpO2) occurs within 1 to 2 minutes. When pre-oxygenation is performed for 3 minutes in healthy subjects with FiO2 = 100%, SpO2 is less than 97% after 7.9 minutes of apnea and arterial O2 desaturation (SpO2 <93%) occurs after 8 to 9 minutes. For this reason and "in order to prevent arterial desaturation during tracheal intubation or supraglottic device insertion maneuvers", it is recommended "to systematically perform a pre-oxygenation procedure (3 min / 8 deep breaths) , including in the context of an emergency ". Tolerance to apnea is conditioned by the amount of O2 stored during the pre-oxygenation phase. Oxygen is transported to different tissues in 2 forms: combined with hemoglobin (Hb) and in dissolved form. In ambient air, the quantity of O2 transported by the Hb is much greater than the part transported in dissolved form. However, when the patient breathes a gas enriched in O2, all the molecules of Hb are quickly saturated (SpO2 = 100%), while the content of dissolved O2 increases constituting a reserve allowing to increase the tolerance to apnea. Under usual conditions (3 minutes pre-oxygenation with FiO2 = 1), tolerance to apnea is shorter in obese subjects. Arterial O2 desaturation occurs after 2-3 minutes of apnea in patients with grade III obesity [Body Mass Index (BMI)> 35 kg / m2]. In addition, arterial O2 desaturation is faster the higher the BMI is. In fact, in obese patients, the lung volumes that can be mobilized in the supine position are modified compared to the non-obese subject: decrease in vital capacity, decrease in expiratory reserve volume, increase in airway resistance, decrease in thoracic compliance. These changes are, in part, explained by the weight of tissue on the rib cage and abdomen leading to compression of the lungs and diaphragm. In addition, there is also an increase in oxygen consumption in patients with a BMI> 40. Different techniques have been proposed to increase apnea tolerance in obese patients. For Dixon et al., The desaturation of the morbidly obese subject (BMI> 40 kg / m2) is less rapid after 3 minutes of pre-oxygenation carried out with the patient in a half-seated position at 25 °: 201 seconds against 155 seconds in the Control group. This additional time seems to correlate with the value of the arterial pressure in O2 (PaO2) measured at the end of the pre-oxygenation (442 vs 360 mmHg). Likewise, the proclive position (30 ° reverse Trendelenburg) during the pre-oxygenation phase seems effective in limiting the occurrence of desaturation after induction. The O2 reserve is usually assessed by measuring the partial pressure of O2 in the arterial blood. A value greater than 100 mmHg indicates that an amount of O2 is "in reserve", increasing tolerance to apnea. In practice, this examination is not feasible in current practice because it requires the performance of an invasive procedure, cannot be measured continuously and the rendering of the result is delayed by several minutes. In recent years, a technology based on spectrophotometry has been developed to measure the saturation of Hb in O2 in non-pulsatile blood. By algorithmic transformation, an Oxygen Reserve Index (ORI) is calculated. Its value varies from 0 to 1 and covers a data range between 100 and 200 mmHg of blood pressure in O2 (moderate hyperoxia). This data is obtained continuously and non-invasively from a sensor (RD Rainbow SET R Sensors; Masimo) placed on the 3rd or 4th finger of the hand. When a patient receives an O2 enriched gas mixture, the value of ORI increases rapidly and reaches a plateau. When the patient is in apnea, the drop in the ORI value precedes the drop in SpO2 by several tens of seconds. In a pilot study observing the kinetics of ORI in non-obese (BMI <25 kg / m2) or obese (BMI> 30 kg / m2) anesthetized patients, we observed that the time required to reach the plateau of l The ORI was longer (133 ± 30 seconds) in "obese" patients compared to "non-obese" patients (89 ± 28 seconds). Thus, one hypothesis to explain the poorer tolerance to apnea in obese patients would be that the duration of 3 minutes of pre-oxygenation as recommended in the recommendations is insufficient.

Start: January 2021

The Effect of Two Different General Anesthesia Regimes on Postoperative Sleep Quality

Major surgery can lead to postoperative disturbances in sleep patterns with subjective deterioration of sleep quality according to patients' reports as well as objective alterations of sleep architecture, as recorded by polysomnography Factors implicated in postoperative sleep disturbances include but are not limited to the severity of the surgical procedure, the neuroendocrine response to surgery, inadequate treatment of postoperative pain and external factors interfering with sleep, such as light, noise and therapeutic procedures There are differences in the molecular mechanisms inhalational anesthetics and intravenous agents affect different brain regions to induce anesthesia. Our hypothesis is that these differences may also be evident during the postoperative period, affecting brain functions which are involved in postoperative sleep architecture. So, the aim of this study will be to assess the effect of two different anesthetic techniques (propofol versus desflurane) of maintaining general anesthesia in patients subjected to similar major operations Patients will be assessed with the Pittsburgh Sleep Quality Questionnaire (PSQI), regarding preoperative and long term postoperative sleep quality, sleep diaries regarding early postoperative sleep quality and biochemical markers (cortisol, prolactin and melatonin) regarding neuroendocrine response to surgery and disturbances in endogenous circadian secretion associated with sleep

Start: March 2014

Effect of Type of General Anesthesia Maintenance on Exhaled Nitric Oxide and Eosinophil Blood Count

Nitric oxide (NO) is a free radical in gas state which plays an important role in a variety of processes relevant to respiratory physiology. It represents a means of detecting airway hyperresponsiveness and appears to have a strong correlation with the eosinophilic infiltration of the airway. Patients who suffered bronchospasm or laryngospasm intraoperatively or postoperatively showed higher levels of exhaled NO. Propofol modifies NO production by stimulating the constitutive synthesis of NO and by inhibiting the inducible production of NO. It seems to exert protective effects on acute lung injury (ALI) in experimental models and it can possibly reduce exhaled NO. There is also evidence that some intravenous anesthetic agents can influence chemotaxis of eosinophils in vitro. Variation of exhaled NO and eosinophils in surgical patients undergoing anesthesia has not been studied before. Therefore, the aim of this study will be to investigate the differential impact of maintenance of general anesthesia with propofol versus maintenance with sevoflurane on exhaled NO and eosinophil blood count.

Start: February 2014

The Effect of Intraoperative Music Listening on Sevoflurane Consumption and Recovery Parameters

The perioperative period can be a significant source of psychological burden, anxiety and fear for patients Both pharmacological and non-pharmacological methods have been proposed in order to alleviate perioperative stress Music is one of the non-pharmacological methods which have been used in this context, with favorable effects both preoperatively and postoperatively The attenuation of perioperative stress through music listening is probably due to the activation of emotional and cognitive processes that evoke feeling of pleasure and can distract patients' attention from fear and unpleasant thoughts related to the surgical procedure Little information is available regarding the effect of intraoperative music listening on anesthetized, unconscious patients There is a notion that general anesthesia does not completely abolish auditory perception and that some processing of intraoperative events can occur in unconscious patients, even in the absence of postoperative recall The investigators hypothesis is that intraoperative music listening can decrease anesthetic requirements and reduce sevoflurane consumption in female patients subjected to abdominal hysterectomy for benign disease.

Start: August 2014

Bilateral Bi-level Erector Spine Plane Block as a Component of General Anesthesia in Surgical Correction of Spinal Deformations

Improving the anesthesiology management for surgical correction of spinal deformations with introducing the diagnostic methods and treatment strategy of acute pain, preventing the evolution of chronic pain. Development and implementation in clinical practice perioperative intensive care protocols for surgical correction of spinal deformities.

Start: December 2020

Assessing the Cortical Response to Noxious and Auditory Stimuli Using Near Infrared Spectroscopy in Subjects Under General Anesthesia

The primary aim is to utilize near-infrared spectroscopy (NIRS) in patients under general anesthesia to measure changes in brain blood flow in the bilateral somatosensory cortices and the prefrontal cortices in response to noxious stimulation.

Start: October 2016

Quadratus Lumborum Versus Transversus Abdominis Plane Nerve Block: A Comparison Study

The Transversus Abdominis Plane (TAP) block is the current standard of care for patients undergoing laparoscopic abdominal surgeries with the Enhanced Recovery After Surgery (ERAS) Protocol. The Quadratus Lumborum (QL) is another established abdominal fascial plane block that is comparable in procedure and risks and may potentially be more beneficial. The study compares the two blocks in hopes of establishing a new standard of care for patients undergoing laparoscopic abdominal surgeries with the ERAS protocol.

Start: May 2018

Gabapentin on Postoperative Pain Associated With Ureteroscopy and Stents Insertion

The study's objective is to determine the efficacy of preoperative gabapentin in relieving postoperative pain, reducing opioid use and improving quality of recovery in subjects undergoing urologic surgery. Investigators hypothesize that subjects receiving gabapentin will have lower pain scores, less opioid consumption and better quality of recovery as compared to subjects who are given a placebo.

Start: January 2018

Anesthetic Considerations for Repeat Cesarean Section - a Prospective Study

The purpose of this study is to examine the anesthetic considerations and outcomes during repeated caesarean section and to compare such considerations in low-order vs high-order repeated caesarean sections.

Start: January 2021

Effect of Low-dose Esketamine Combined With Target-controlled Infusion of Propofol for Painless Gastrointestinal Endoscopy

Purpose: 1. To determine the efficacy of low-dose esketamine in painless gastrointestinal endoscopy. 2. To determine the safety of low-dose esketamine in painless gastrointestinal endoscopy. 3. To provide a theoretical basis and new ideas for the application of esketamine as a new drug in perioperative period.

Start: December 2020

Tolerance to Sevoflurane in Children Undergoing Repeated Drug Exposure

Deep sedation or general anesthesia is frequently required for infant that need radiotherapy to treat malignancies. As radiation therapy usually consist of several sessions, these patients are exposure to several consecutive anesthetic exposures (e.g. for some central nervous system tumors 30 sessions of radiotherapy are required). In our center, this 30-min anesthetic exposure are with sevoflurane. Considering that repeated daily exposure to such potent drugs, as general anesthetics, may induce tolerance, it is reasonable to explore whether this phenomenon is occurring in this population. The aim of this observational study was to determine if a repeated exposure to sevoflurane is associated with the development of clinical and electroencephalographic tolerance. We will enroll 16 pediatric patients, and we will measure the time needed to appropriately place the laryngeal mask (clinical effect) and we also will compare the electroencephalographic signal under anesthesia across the different sessions (electroencephalographic effect).

Start: November 2019

General Anesthesia Exposure and Neurodevelopmental Outcome in Pediatrics

This study investigates the impact of different levels of anesthesia exposure on children's neurocognitive development and evaluates the concurrent validity of different methods that assess neurodevelopmental outcome.

Start: October 2020