View clinical trials related to Near-infrared Spectroscopy.
Filter by:The aim of this study was to measure the acute change in oxygen saturation of skeletal muscle during resistance exercise in the upper extremity using near-infrared spectroscopy.
Infants with congenital heart disease (CHD) are at increased risk for delayed neurodevelopment. Multiple etiological explanations have been proposed, as there seems to be a multifactorial interplay of both prenatal and perioperative factors. The main goal of this research project is to focus on peri-operative physiological risk factors in infants with CHD which impair functional brain maturation or elicit brain injury, and subsequently creating a risk model and guidelines for standardized developmental follow-up in this population. PART 1: investigation of cerebral autoregulation and neurovascular coupling The homeostasis in cerebral blood supply regardless of perfusion pressure, is called Cerebral autoregulation (CAR). Neurovascular coupling (NVC) is the phenomenon in which blood supply increases as a result of increased brain activity in a specific area. At different times in the perioperative phase, these regulatory mechanisms will be estimated based on Electroencephalography (EEG) and Near Infrared Spectroscopy (NIRS), in addition to hemodynamic parameters. PART 2: cell-free DNA (cfDNA) extraction. Non-invasive monitoring of neuronal degeneration can be performed using cfDNA extraction techniques. Serial measurements of neuronal cfDNA will be used to determine whether and when this neuronal damage has occurred. PART 3: Prognosis and outcome. These risk factors, supplemented with demographic factors and medications administered, will be combined in an Artificial Intelligence-driven model, thus establishing a risk model for neurodevelopmental outcome. This model will be compared to the current standard-of-care, both structural imaging (ultrasound and MRI) and a clinical developmental assessment at 9 and 24 months of age (Bayley Scales of Infant Development-III).
Tests such as the pin-prick test, cold application or the Bromage scale are currently used to measure the success of nerve blocks and are considered subjective assessments as they require verbal consent from the patient. Near Infrared Spectroscopy (NIRS) measures the differential absorption and reflection of near infrared light transmitted by human tissues, providing a tissue-oxygen saturation index. Modern NIRS-based instruments use multiple detectors to filter spectroscopy data from skin structures to detect subcutaneous tissue oxygenation. Successful regional anesthesia results in decreased sympathetic activity within the distribution of blocked nerves. Regional oxygen saturation (rSO2) has been shown to increase in innervated areas after sympathetic block.
The evidence on the effects of clinical care with cerebral NIRS (Near-infrared spectroscopy) monitoring on short term neurological outcome, displayed by fidgety movements between six to 20 weeks post term, are still uncertain. Two centers (Graz and Innsbruck), who participated in the COSGOD III trial, routinely performed GMA between 37+0 to 42+0 weeks of corrected age (writhing movements) and between six to 20 weeks post term (fidgety movements). Aim of the present study is therefore to assess in neonates, who were included into the COSGOD III trial, in a retrospective observational study routinely performed fidgety movements between six to 20 weeks of corrected age after discharge. The investigators hypothesise that the preterm neonates in the intervention group of the COSGOD III trial show better survival and short term neurological outcome, displayed by normal fidgety movements, compared to neonates in the control group.
The experiment will consist of 3 consecutive trials performed in a sound-insulated climate chamber (20°C and 40% RH) at the VUB. Participants will be asked to return 3 successive weeks. Trained staff (pre-doctoral researchers and trained master students) will be present during the experimental trials. The first visit will be a familiarization trial in which they will complete all procedures as if it was an experimental trial, except for the interventional 60min Stroop task. Instead of the 60-min Stroop task the participants' maximal cognitive capacity will be determined. The participant wil come in, perform a cognitive performance test, will then perform the intervention/control procedure, which will be followed by an additional conduction of the same cognitive performance test as before the intervention/control, as well as a physical performance test (time to exhaustion cycling test). The intervention will consist of a 60 min Stroop task, while the control trial will consist of watching a documentary of the same duration. Multiple different questionnaires (e.g. to assess the mentally fatigued state of participants) will be assessed throughout the experimental/control trial. The aim of this study will be to research if mental fatigue influences prefrontal cortex oxygenation during a time to exhaustion cycling test. Marcora et al. (2009) already showed a decrease in cycling performance during the exact same protocol.
The research objectives of this project are to increase the understanding of pathophysiology and performance limitations related to sport-related flow limitation in the iliac artery (FLIA) using non-invasive measurement of muscle oxygenation at the working muscles of the leg and mechanical power output recorded during cycling exercise. Skeletal muscle oxygenation measured with Near-Infrared Spectroscopy (NIRS) is growing more accessible for use by coaches, teams, and individual athletes for use in performance testing. Describing how muscle oxygenation profiles in endurance athletes diagnosed with FLIA differ in comparison with healthy athletes may allow the use of this non-invasive, accessible measurement device for the screening of athletes at risk of developing FLIA. The relevance of this work is that FLIA imposes risk of irreversible injury to the main artery of the leg in endurance athletes, limiting their ability to participate in exercise, with further consequences for health, fitness, and quality of life. Currently, the early course of this progressive condition is poorly understood, as early detection is difficult and hence appropriate treatment is often delayed. If impairment becomes severe, often more invasive (and risky) treatment is necessary. Earlier detection and monitoring of FLIA may allow for improved patient management and outcomes. The design of this experiment will compare a patient group of trained cyclists diagnosed with FLIA, to healthy control subjects including cyclists of a similar fitness level without signs of FLIA. Both groups will perform an incremental ramp cycling test and an intermittent multi-stage cycling exercise test. Incremental ramp cycling testing is used as part of clinical diagnosis of FLIA, as well as performance (eg. VO2max) testing of healthy athletes. Multi-stage exercise protocols are also often used for performance testing of endurance athletes and allows for observation of (path)physiological responses during submaximal work stages. Outcome measures of muscle oxygenation kinetics with NIRS and cycling power will be analysed and compared between patients and healthy subjects.
Introduction Both Mental Fatigue (MF) and hypoxia impair multiple aspects of cognitive functioning. The decline in cognitive functioning in hypoxic conditions is associated with alterations in brain oxygenation and hemodynamic responses. These hemodynamic responses are preferably measured at the prefrontal cortex, an area of the brain that is known for its executive function and role in decision making, planning, attention and (short-term) memory. This study will investigate the role of prefrontal cortex oxygenation during the development of mental fatigue and during cognitive performances by altering the ambient oxygen availability through normobaric hypoxia (3800m; 12,9% O2) and normoxia. Methods Subjects will perform four trials in a sound-insulated climate chamber (20°C and 40% RH). Upon entry in the climatic chamber participants will adapt to the environment for 30 minutes. Next, they will perform a modified cognitive test battery "cognition", a fine motor task "Motor Performance Series" and a visuomotor-fitlight task before and after a 60-minute individualized Stroop task or control task (randomized. blinded, placebo controlled, counter-balanced, cross-over design). Nearinfrared spectroscopy (NIRS) will be used to assess hemodynamic changes (oxygenated hemoglobin (O2Hb), deoxygenated-hemoglobin (HHb) and total hemoglobin (tHb)) at the PFC. Hypotheses 1) MF will lead to earlier changes in the prefrontal NIRS-parameters (O2Hb, HHb, tHb) with lower oxygen availability. 2) The effects of MF on cognitive performance manifest itself to a greater extent with lower oxygen availability.3) Visuomotor performance declines to a greater extent due to MF with lower oxygen availability.
This study aims to investigate the circulation and oxygenation changes of deep tissue respond on low level light/laser therapy (LLLT) in the healthy population. The investigators used a self-made near infrared spectroscopy (NIRS) instrument to noninvasively monitor hemodynamic indicators of brain and forearm muscle groups, including total hemoglobin ([tHb]), and blood flow (BF) and oxygen consumption (VO2).
The NeurO2 study is a multicenter observational study looking at NIRS monitoring in neurocrocritically ill patients during the acute phase of care following an acute brain injury. The study is nested within the HEMOTION Trial and the SAHaRA Trial
Thyroidectomy operations have traditionally been performed as open surgery. However, the scarring that occurs in the patient leads to cosmetic problems, especially in young women. Today, as a result of the development of minimally invasive surgical techniques, the number of natural orifice transluminal endoscopic surgeries (NOTES) is increasing. Surgical scars are avoided by using natural pathways such as the mouth, urethra, vagina or anus. Transoral endoscopic thyroidectomy (TOETVA) with vestibular approach, a form of NOTES, was first performed in 2011. In this method, the operation is performed through three ports entered near the gingiva-buccal sulcus. TOETVA surgeries are performed with an insufflation pressure of 6 mmHg in the neck region. No studies are examining the effects of this pressure on the blood vessels in the neck region on the blood supply to the brain tissue. Therefore, the investigators aim to compare cases operated using open thyroidectomy or TOETVA method by measuring cerebral regional tissue saturation.