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Cerebral oximetry

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https://www.readbyqxmd.com/read/28212237/response-to-use-of-cerebral-oximetry-during-cardiac-arrest
#1
Yvonne Price, Sibtain Anwar
No abstract text is available yet for this article.
March 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28206993/hemodynamic-effects-of-sodium-bicarbonate-administration
#2
A C Katheria, M K Brown, K Hassan, D M Poeltler, D A Patel, V K Brown, J B Sauberan
OBJECTIVE: To describe the hemodynamic changes that occur with sodium bicarbonate (NaHCO3) administration in premature neonates. STUDY DESIGN: This retrospective study included premature neonates 23 to 31+6 weeks of gestational age who underwent continuous cardiac and cerebral monitoring as participants in prospective trials at our institution, and who received NaHCO3 infused over 30 min in the first 24 h of life. Blood pressure (BP), heart rate, cardiac output (CO), SpO2 and cerebral oximetry (StO2) were captured every 2 s...
February 16, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28152128/quantifying-cerebral-hypoxia-by-near-infrared-spectroscopy-tissue-oximetry-the-role-of-arterial-to-venous-blood-volume-ratio
#3
Martin B Rasmussen, Vibeke R Eriksen, Bjørn Andresen, Simon Hyttel-Sørensen, Gorm Greisen
No abstract text is available yet for this article.
February 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28113987/optical-characterization-of-tissue-phantoms-using-a-silicon-integrated-fdnirs-system-on-chip
#4
Chirag C Sthalekar, Yun Miao, Valencia Joyner Koomson
An interface circuit with signal processing and digitizing circuits for a high frequency, large area avalanche photodiode (APD) has been integrated in a 130 nm BiCMOS chip. The system enables the absolute oximetry of tissue using frequency domain Near Infrared Spectroscopy (fdNIRS). The system measures the light absorbed and scattered by the tissue by measuring the reduction in the amplitude of signal and phase shift introduced between the light source and detector which are placed a finite distance away from each other...
September 22, 2016: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28086807/detection-of-critical-cerebral-desaturation-thresholds-by-three-regional-oximeters-during-hypoxia-a-pilot-study-in-healthy-volunteers
#5
Kerry L Tomlin, Anna-Maria Neitenbach, Ulf Borg
BACKGROUND: Regional oximetry is increasingly used to monitor post-extraction oxygen status of the brain during surgical procedures where hemodynamic fluctuations are expected. Particularly in cardiac surgery, clinicians employ an interventional algorithm to restore baseline regional oxygen saturation (rSO2) when a patient reaches a critical desaturation threshold. Evidence suggests that monitoring cardiac surgery patients and intervening to maintain rSO2 can improve postoperative outcomes; however, evidence generated with one manufacturer's device may not be applicable to others...
January 13, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/28068656/mechanisms-of-improved-exercise-performance-under-hyperoxia
#6
Silvia Ulrich, Elisabeth D Hasler, Séverine Müller-Mottet, Stephan Keusch, Michael Furian, Tsogyal D Latshang, Simon Schneider, Stéphanie Saxer, Konrad E Bloch
BACKGROUND: The impact of hyperoxia on exercise limitation is still incompletely understood. OBJECTIVES: We investigated to which extent breathing hyperoxia enhances the exercise performance of healthy subjects and which physiologic mechanisms are involved. METHODS: A total of 32 healthy volunteers (43 ± 15 years, 12 women) performed 4 bicycle exercise tests to exhaustion with ramp and constant-load protocols (at 75% of the maximal workload [Wmax] on FiO2 0...
2017: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/28060323/a-model-to-simulate-clinically-relevant-hypoxia-in-humans
#7
Lars Eichhorn, Florian Kessler, Volker Böhnert, Felix Erdfelder, Anja Reckendorf, Rainer Meyer, Richard K Ellerkmann
In case of apnea, arterial partial pressure of oxygen (pO2) decreases, while partial pressure of carbon dioxide (pCO2) increases. To avoid damage to hypoxia sensitive organs such as the brain, compensatory circulatory mechanisms help to maintain an adequate oxygen supply. This is mainly achieved by increased cerebral blood flow. Intermittent hypoxia is a commonly seen phenomenon in patients with obstructive sleep apnea. Acute airway obstruction can also result in hypoxia and hypercapnia. Until now, no adequate model has been established to simulate these dynamics in humans...
December 22, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28054177/factors-associated-with-a-low-initial-cerebral-oxygen-saturation-value-in-patients-undergoing-cardiac-surgery
#8
Kensuke Kobayashi, Tadashi Kitamura, Satoshi Kohira, Shinzo Torii, Tetsuya Horai, Mitsuhiro Hirata, Toshiaki Mishima, Koichi Sughimoto, Hirotoki Ohkubo, Yusuke Irisawa, Takuya Matsushiro, Hidenori Hayashi, Yurie Miyata, Yuta Tsuchida, Naoki Ohtomo, Kagami Miyaji
Regional cerebral oximetry using near-infrared spectroscopy device, an INVOS 5100 C (Medtronic, Minneapolis, MN, USA), during cardiac surgery aims to avoid perioperative neurological impairment, especially during cardiopulmonary bypass. However, it is not uncommon to encounter critically low initial cerebral regional oxygen saturation or a low value unresponsive to intervention. Therefore, it is important to identify factors associated with low saturation value other than true cerebral hypoxia. We investigated the relationship between preoperative regional cerebral oxygen saturation and clinical variables during cardiac surgery...
January 4, 2017: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
https://www.readbyqxmd.com/read/28044331/cerebral-oximetry-and-its-role-in-adult-cardiac-non-cardiac-surgery-and-resuscitation-from-cardiac-arrest
#9
REVIEW
D W Green, G Kunst
Monitors using near-infra red spectroscopy to assess cerebral oxygenation levels non-invasively in discrete areas of the brain have been used clinically for over 20 years. Interest has intensified recently, especially during cardiac surgery, and there are now five commercially available devices. Despite the attraction of being able to measure oxygen supply/demand in such a critical area, there has been only limited uptake of this technology in overall clinical anaesthetic practice. This narrative review aims to explore not only the rationale for using this technology but also the factors which have restricted its more widespread use...
January 2017: Anaesthesia
https://www.readbyqxmd.com/read/28039082/intraoperative-cerebral-oxygenation-oxidative-injury-and-delirium-following-cardiac-surgery
#10
Marcos G Lopez, Pratik Pandharipande, Jennifer Morse, Matthew S Shotwell, Ginger L Milne, Mias Pretorius, Andrew D Shaw, L Jackson Roberts, Frederic T Billings
BACKGROUND: Delirium affects 20-30% of patients after cardiac surgery and is associated with increased mortality and persistent cognitive decline. Hyperoxic reperfusion of ischemic tissues increases oxidative injury, but oxygen administration remains high during cardiac surgery. We tested the hypothesis that intraoperative hyperoxic cerebral reperfusion is associated with increased postoperative delirium and that oxidative injury mediates this association. METHODS: We prospectively measured cerebral oxygenation with bilateral oximetry monitors in 310 cardiac surgery patients, quantified intraoperative hyperoxic cerebral reperfusion by measuring the magnitude of cerebral oxygenation above baseline after any ischemic event, and assessed patients for delirium twice daily in the ICU following surgery using the confusion assessment method for ICU (CAM-ICU)...
February 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28034908/targeted-oxygen-in-the-resuscitation-of-preterm-infants-a-randomized-clinical-trial
#11
Ju Lee Oei, Ola D Saugstad, Kei Lui, Ian M Wright, John P Smyth, Paul Craven, Yueping Alex Wang, Rowena McMullan, Elisabeth Coates, Meredith Ward, Parag Mishra, Koert De Waal, Javeed Travadi, Kwee Ching See, Irene G S Cheah, Chin Theam Lim, Yao Mun Choo, Azanna Ahmad Kamar, Fook Choe Cheah, Ahmed Masoud, William Tarnow-Mordi
BACKGROUND AND OBJECTIVES: Lower concentrations of oxygen (O2) (≤30%) are recommended for preterm resuscitation to avoid oxidative injury and cerebral ischemia. Effects on long-term outcomes are uncertain. We aimed to determine the effects of using room air (RA) or 100% O2 on the combined risk of death and disability at 2 years in infants <32 weeks' gestation. METHODS: A randomized, unmasked study designed to determine major disability and death at 2 years in infants <32 weeks' gestation after delivery room resuscitation was initiated with either RA or 100% O2 and which were adjusted to target pulse oximetry of 65% to 95% at 5 minutes and 85% to 95% until NICU admission...
January 2017: Pediatrics
https://www.readbyqxmd.com/read/28005566/anesthesia-for-functional-endoscopic-sinus-surgery
#12
Daniel A Carlton, Satish Govindaraj
PURPOSE OF REVIEW: The present article summarizes anesthetic techniques used during functional endoscopic sinus surgery to decrease bleeding and aid in creating a clear surgical field. The applicable physiology behind these anesthetic techniques is reviewed with emphasis on the effect on bleeding and the surgical field. Deliberate hypotension, reverse Trendelenburg positioning, regional anesthesia, and cerebral monitoring are discussed. RECENT FINDINGS: There are mixed data as to whether traditional inhalation anesthesia or total intravenous anesthesia is superior with respect to better surgical fields and decreased blood loss...
February 2017: Current Opinion in Otolaryngology & Head and Neck Surgery
https://www.readbyqxmd.com/read/27982555/how-to-manage-blood-pressure-after-brain-injury
#13
Laurent Carteron, Fabio S Taccone, Mauro Oddo
Manipulation of blood pressure (BP) is a mainstay of therapy in patients with acute brain injury (ABI). In the early emergent phase (first hours from injury), depending on intracranial pathology, BP manipulation aims to 1) limit the progression of parenchymal hematomas or hemorrhagic transformation (in patients with ischemic/hemorrhagic stroke and aneurysmal subarachnoid hemorrhage [SAH]), and 2) attenuate hypoperfusion and secondary cerebral ischemic insults (in patients with traumatic brain injury [TBI])...
December 16, 2016: Minerva Anestesiologica
https://www.readbyqxmd.com/read/27909605/cerebral-oximetry-in-general-anaesthesia
#14
EDITORIAL
Tamás Végh
No abstract text is available yet for this article.
October 2016: Turkish Journal of Anaesthesiology and Reanimation
https://www.readbyqxmd.com/read/27909604/effects-of-head-position-on-cerebral-oxygenation-and-blood-flow-velocity-during-thyroidectomy
#15
Ayten Saraçoğlu, Demet Altun, Ayşen Yavru, Nihat Aksakal, İsmail Cem Sormaz, Emre Camcı
OBJECTIVE: Determining the blood flow through intra and extra-cranial arteries during neck extension may be helpful but is a controversial issue. We aimed to elucidate the changes in cerebral blood flow related to head positioning during thyroid surgery by carotid Doppler examination and regional oxygen saturation variations. METHODS: Thirty patients were recruited to the study. Patients were positioned with a final position of thyroidectomy consisting a 30° semi Fowler with the extension of neck and head...
October 2016: Turkish Journal of Anaesthesiology and Reanimation
https://www.readbyqxmd.com/read/27909499/hyperacute-and-chronic-changes-in-cerebral-magnetic-resonance-images-after-pvac-nmarq-and-epicardial-thoracoscopic-surgical-ablation-for-paroxysmal-atrial-fibrillation
#16
Conn Sugihara Mbbs, Neil Barlow Mbbs, Emma Owens Mbbs, David Sallomi Mb ChB, Neil Sulke Md
Threshold testing of cardiac rhythm devices is essential to monitoring the proper functioning of such devices (1). However, the currently method of applying multiple ECG leads to the patient is burdensome and time consuming (2). We are presenting a completely new way to perform cardiac rhythm device threshold testing using pulse oximetry. Twenty patients, with varying cardiac rhythm devices and pacing modes, were enrolled and had their atrial and ventricular thresholds tested. A comparison was made between simultaneous threshold determinations via the standard EGM based method and the new pulse oximetry based method...
April 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27807663/effect-of-posture-and-extracranial-contamination-on-results-of-cerebral-oximetry-by-near-infrared-spectroscopy
#17
Shinya Kato, Kenji Yoshitani, Yosuke Kubota, Yuzuru Inatomi, Yoshihiko Ohnishi
BACKGROUND: Near-infrared spectroscopy (NIRS)-based cerebral oximetry is a noninvasive technology used to estimate regional cerebral oxygen saturation (rSO2). Extracranial blood flow is known to substantially affect rSO2 values measured by most clinically available devices. Several studies have also reported that the Trendelenburg position and upright position have a larger effect on rSO2 measurements than the supine position. Therefore, we investigated the effect of these two positions (the Trendelenburg position versus the upright position) and extracranial contamination on rSO2 measurements obtained using two commercially available devices and one prototype device...
November 2, 2016: Journal of Anesthesia
https://www.readbyqxmd.com/read/27793105/assessment-of-risk-factors-for-cerebral-oxygen-desaturation-during-neonatal-and-infant-general-anesthesia-an-observational-prospective-study
#18
Ilona Razlevice, Danguole C Rugyte, Loreta Strumylaite, Andrius Macas
BACKGROUND: Cerebral oxygen saturation (rSO2c) decrease from baseline greater than 20 % during infant cardiac surgery was associated with postoperative neurologic changes and neurodevelopmental impairment at 1 year of age. So far, there is no sufficient evidence to support the routine monitoring of rSO2c during general surgical procedures in children. We aimed to find out the frequency of cerebral desaturation 20 % or more from baseline and to identify possible predictors of change in cerebral oxygen saturation during neonatal and infant general surgery...
October 28, 2016: BMC Anesthesiology
https://www.readbyqxmd.com/read/27713204/-rupture-of-saccular-brachiocephalic-artery-aneurysm-after-one-year-and-seven-months-from-coil-embolization-report-of-a-case
#19
Shinya Terada, Masaki Tabuchi, Akihiko Yamauchi
A 52-years-old man, who had undergone coil embolization of saccular aneurysm of the brachiocephalic artery, presented with right back discomfort. Diagnosis by computed tomography was difficult because of an artifact from the coils. Angiography, on the other hand, revealed a rupture of the aneurysm, and emergency surgery was performed. A Y-shaped graft was anastomosed to the ascending aorta under partial clamp. Then, one of its branches was anastomosed to the common carotid artery also under partial clamp in an end-to-side fashion...
October 2016: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/27708177/neurophysiological-intraoperative-monitoring-during-aortic-arch-surgery
#20
REVIEW
Jeffrey E Keenan, Ehsan Benrashid, Emily Kale, Alina Nicoara, Aatif M Husain, G Chad Hughes
Circulatory management during replacement of the aortic arch is complex and involves a period of circulatory arrest to provide a bloodless field during arch vessel anastomosis. To guard against ischemic brain injury, tissue metabolic demand is reduced by systemically cooling the patient prior to circulatory arrest. Neurophysiological intraoperative monitoring (NIOM) is often used during the course of these procedures to provide contemporaneous assessment of brain status to help direct circulatory management decisions and detect brain ischemia...
December 2016: Seminars in Cardiothoracic and Vascular Anesthesia
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