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Venous Saturation

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https://www.readbyqxmd.com/read/29447940/the-relationship-between-plasma-vascular-endothelial-growth-factor-and-erythrocyte-2-3-bisphosphoglycerate-the-putative-role-of-chronic-hypoxia
#1
B K Puri, J A Monro
The non-invasive assessment of chronic tissue hypoxia is difficult. Pulse oximetry only allows the peripheral oxygen saturation to be measured, while the detection of hyperlactataemia needs to take into account the fact that the accumulation of lactic acid may result from several causes other than prolonged tissue hypoxia. Arterial blood oxygen measurement is invasive and often does not give a good indication of the level of tissue hypoxia. Other suggested methods include the use of positron emission tomography, magnetic resonance T2 ∗ relaxation time measurement, photoacoustics and high-frequency ultrasound...
March 2018: Medical Hypotheses
https://www.readbyqxmd.com/read/29447932/determining-the-venous-oxygen-reservoir-a-novel-hypothetical-approach-to-titration-of-supplemental-oxygen-in-preterm-newborns
#2
Chad C Andersen, Nicolette A Hodyl, Nina M Ziegler, Michael J Stark
While normal oxygen saturation is commonly thought to be a marker of normal oxygenation, cutaneous saturation does not account for the sufficiency of oxygen within each cell or that of the system overall. Rather, cutaneous oximetry simply defines the saturation of haemoglobin (Hb) with oxygen in a pulsatile vessel. Assessment of sufficiency is best determined by measurement of the amount of oxygen left over following aerobic respiration. This left over oxygen is 'stored' on Hb in the venous compartment and can be calculated as the venous oxygen content...
March 2018: Medical Hypotheses
https://www.readbyqxmd.com/read/29444562/fluid-resuscitation-during-early-sepsis-a-need-for-individualization
#3
Mathieu Jozwiak, Olfa Hamzaoui, Xavier Monnet, Jean-Louis Teboul
The prognosis of septic shock is tightly linked to the earliness of both appropriate antibiotic therapy and early hemodynamic resuscitation. This latter is essentially based on fluid and vasopressors administration. The step-by-step strategy, called "early goal-directed therapy" (EGDT) developed in 2001 and endorsed by the Surviving Sepsis Campaign (SSC) between 2004 and 2016 is no longer recommended. Indeed, recent multicenter randomized clinical trials showed no reduction in all-cause mortality, duration of organ support and in-hospital length of stay with EGDT in comparison with standard care...
February 14, 2018: Minerva Anestesiologica
https://www.readbyqxmd.com/read/29434789/effects-of-pumpless-extracorporeal-lung-assist-on-hemodynamics-gas-exchange-and-inflammatory-cascade-response-during-experimental-lung-injury
#4
Zhihai Ju, Jinhui Ma, Chen Wang, Jie Yu, Yeru Qiao, Feilong Hei
Pumpless extracorporeal lung assist (pECLA) has been reported to efficiently remove the systemic CO 2 production and provide mild to moderate oxygenation, thereby allowing for ventilator settings and modes prioritizing oxygenation and lung protection. However, an adequate bypass flow, the capacity to provide respiratory support and the effect on the inflammatory cascade response and tissue perfusion require further study to be determined. After induction of acute lung injury (ALI) by oleic acid injection, pECLA was implemented in 12 anaesthetized and mechanically ventilated dogs for 48 h...
February 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29428622/targeted-increase-in-pulmonary-blood-flow-in-a-bidirectional-glenn-circulation
#5
Samuel L Casella, Aditya Kaza, Pedro Del Nido, James E Lock, Audrey Marshall
Objective In patients with a Glenn shunt and unilateral pulmonary vascular abnormalities, supplemental pulmonary blood flow may improve antegrade flow in the target lung and may permit eventual Fontan completion, while mitigating the risks of uncontrolled additional flow to the contralateral lung. We attempted this by inserting a small aortopulmonary shunt into the affected pulmonary artery and banding the central pulmonary artery. .Methods We performed a retrospective review of all patients who underwent this procedure from 2000-2015...
February 8, 2018: Seminars in Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29401129/early-ambulation-after-microsurgical-reconstruction-of-the-lower-extremity
#6
Michael J Orseck, Christopher Robert Smith, Sean Kirby, Manuel Trujillo
Successful outcomes after microsurgical reconstruction of the lower extremity include timely return to ambulation. Some combination of physical examination, ViOptix tissue oxygen saturation monitoring, and the implantable venous Doppler have shown promise in increasing sensitivity of current flap monitoring. We have incorporated this system into our postoperative monitoring protocol in an effort to initiate earlier dependency protocols. A prospective analysis of 36 anterolateral thigh free flap and radial forearm flaps for lower extremity reconstruction was performed...
February 2, 2018: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/29397598/-the-clinical-significance-of-microcirculation-and-oxygen-metabolism-evaluation-in-acute-kidney-injury-assessment-in-patients-with-septic-shock-after-resuscitation
#7
C Yu, D W Liu, X T Wang, H W He, P Pan, Z Q Xing
Objective: To evaluate the value of microcirculation and oxygen metabolism evaluation (MicrOME) in acute kidney injury(AKI) evaluation in patients with septic shock after resuscitation. Methods: Consecutive patients with septic shock after resuscitation and mechanical ventilation were enrolled from October 2016 to February 2017 in ICU at Peking Union Medical College Hospital.Patients were divided into 3 groups based on 10 min transcutaneous oxygen challenge test transcutaneous partial pressure of oxygen(PtcO(2))and venoarterial pressure of carbon dioxide difference (Pv-aCO(2)) /arteriovenous O(2) content difference (Ca-vO(2)) by blood gas analysis, i...
February 1, 2018: Zhonghua Nei Ke za Zhi [Chinese Journal of Internal Medicine]
https://www.readbyqxmd.com/read/29395815/association-of-oral-intake-and-transient-mixed-venous-oxygen-desaturation-in-patients-undergoing-fast-track-postoperative-care-after-open-heart-surgery
#8
Yuichi Maki, Daisuke Toyoda, Keiko Tomichi, Jun Onodera, Yoshifumi Kotake
OBJECTIVE: The impact of early resumption of oral intake after cardiac surgery on hemodynamics has not been characterized. The authors examined the effects of early oral intake on the oxygen supply-demand relationship in patients undergoing on-pump cardiac surgery in an early recovery after surgery program. DESIGN: Prospective data were collected in postcardiac surgical patients in a multidisciplinary intensive care unit (ICU) during an 18-month period. SETTING: Single institution study...
December 20, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29371097/akt-activation-improves-microregional-oxygen-supply-consumption-balance-after-cerebral-ischemia-reperfusion
#9
Harvey R Weiss, Oak Z Chi, Geza K Kiss, Xia Liu, Stacey Damito, Estela Jacinto
There have been reports that activation of Akt may provide neuroprotection after cerebral ischemia-reperfusion. We tested the hypothesis that activation of Akt would decrease infarct size and improve microregional O2 supply/consumption balance after cerebral ischemia-reperfusion. This hypothesis was tested in isoflurane-anesthetized rats with middle cerebral artery blockade for 1 hr and reperfusion for 2 hr with or without SC-79 (Akt activator, 0.05 mg/kg, three doses). Regional cerebral blood flow was determined using a C14-iodoantipyrine autoradiographic technique...
January 22, 2018: Brain Research
https://www.readbyqxmd.com/read/29369096/electroencephalography-and-brain-oxygenation-monitoring-in-the-perioperative-period
#10
Thomas W L Scheeren, Merel H Kuizenga, Holger Maurer, Michel M R F Struys, Matthias Heringlake
Maintaining brain function and integrity is a pivotal part of anesthesiological practice. The present overview aims to describe the current role of the 2 most frequently used monitoring methods for evaluation brain function in the perioperative period, ie, electroencephalography (EEG) and brain oxygenation monitoring. Available evidence suggests that EEG-derived parameters give additional information about depth of anesthesia for optimizing anesthetic titration. The effects on reduction of drug consumption or recovery time are heterogeneous, but most studies show a reduction of recovery times if anesthesia is titrated along processed EEG...
January 23, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29343014/-correlation-between-peripheral-venous-oxygen-saturation-and-hemodynamic-parameters-in-patients-with-pulmonary-hypertension
#11
C Hong, J Y Li, R K Chen, C L Liu, X N Wang, S M Qing, X F Su, N F Zhang
Objective: To investigate the correlation of peripheral venous oxygen saturation (SpvO(2)) with mixed venous oxygen saturation (SvO(2)), pulmonary vascular resistance (PVR) and cardiac index (CI) in patients with pulmonary hypertension (PH), in order to predict these parameters using SpvO(2) and assess the prognosis of patients. Methods: Hospitalized patients diagnosed with PH by right heart catheterization in the Guangzhou Institute of Respiratory Diseases from July 2015 to October 2016 were retrospectively analyzed...
January 12, 2018: Chinese Journal of Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/29342097/time-domain-near-infrared-spectroscopy-device-for-monitoring-muscle-oxidative-metabolism-custom-probe-and-in-vivo-applications
#12
Rebecca Re, Ileana Pirovano, Davide Contini, Lorenzo Spinelli, Alessandro Torricelli
Measurement of muscle oxidative metabolism is of interest for monitoring the training status in athletes and the rehabilitation process in patients. Time domain near infrared spectroscopy (TD NIRS) is an optical technique that allows the non-invasive measurement of the hemodynamic parameters in muscular tissue: concentrations of oxy- and deoxy-hemoglobin, total hemoglobin content, and tissue oxygen saturation. In this paper, we present a novel TD NIRS medical device for muscle oxidative metabolism. A custom-printed 3D probe, able to host optical elements for signal acquisition from muscle, was develop for TD NIRS in vivo measurements...
January 17, 2018: Sensors
https://www.readbyqxmd.com/read/29324491/validation-of-a-second-generation-near-infrared-spectroscopy-monitor-in-children-with-congenital-heart-disease
#13
Viviane G Nasr, Lisa T Bergersen, Hung-Mo Lin, Paul B Benni, Rachel S Bernier, Michelle E Anderson, Barry D Kussman
BACKGROUND: Cerebral oximetry using near-infrared spectroscopy is a noninvasive optical technology to detect cerebral hypoxia-ischemia and develop interventions to prevent and ameliorate hypoxic brain injury. Cerebral oximeters are calibrated and validated by comparison of the near-infrared spectroscopy-measured cerebral O2 saturation (SctO2) to a "field" or reference O2 saturation (REF CX) calculated as a weighted average from arterial and jugular bulb oxygen saturations. In this study, we calibrated and validated the second-generation, 5 wavelength, FORE-SIGHT Elite with the medium sensor (source-detector separation 12 and 40 mm) for measurement of SctO2 in children with congenital heart disease...
January 9, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29318718/regional-cerebral-tissue-oxygen-saturation-changes-following-blood-transfusion-in-neuro-intensive-care-unit-patients%C3%A2-%C3%A2-a-pilot-observational-study
#14
R Muthuchellappan, N A Shaikh, R M Surve, U R S Ganne, M Philip
BACKGROUND: Although central venous oxygen saturation (ScvO2 ) is used to decide on red blood cell (RBC) transfusion, whether its improvement is associated with parallel improvement in cerebral oxygenation is not adequately studied. This study looked at changes in regional cerebral tissue oxygen saturation (rSO2 ) following RBC transfusion in neuro-intensive care unit (ICU) patients. METHODS: In this prospective observational pilot study, rSO2 was measured in adult neuro-ICU patients before RBC transfusion, at the end and at 6, 12, 18 and 24 h after RBC transfusion...
January 10, 2018: Transfusion Medicine
https://www.readbyqxmd.com/read/29315433/indications-for-and-results-of-axillary-arterio-venous-fistula-in-patients-with-a-functionally-single-ventricle-after-cavopulmonary-anastomosis
#15
Ivan A Yurlov, Vladimir P Podzolkov, Dmitry V Kovalev, Mikhail M Zelenikin, Victor B Samsonov, Nikolay S Chikin, Lyudmila A Yurpol'skaya, Tatyana V Mataeva
OBJECTIVES: This study aimed to investigate the indications for and the results of axillary arterio-venous fistula in patients with a functionally single ventricle at mid-term follow-up after bidirectional cavopulmonary connection. METHODS: From 2012 to 2017, 20 patients aged 21 ± 8.7 years underwent axillary arterio-venous fistula after bidirectional cavopulmonary connection in our institution. The interval between bidirectional cavopulmonary connection and axillary arterio-venous fistula was 13...
January 5, 2018: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/29310555/mechanical-circulatory-support-for-the-failing-fontan-conversion-to-assisted-single-ventricle-circulation-preliminary-observations
#16
Syed M Peer, Kristopher B Deatrick, Thomas J Johnson, Jonathan W Haft, Francis D Pagani, Richard G Ohye, Edward L Bove, Alvaro Rojas-Peña, Ming-Sing Si
BACKGROUND: Mechanical circulatory support (MCS) of a failing Fontan circulation remains challenging. We hypothesized that MCS can be provided by converting the Fontan circulation into a mechanically assisted single ventricle parallel circulation (MASVC). METHODS: A porcine model of functionally univentricular circulation was created under cardiopulmonary bypass (CPB) by performing an atrial septectomy, tricuspid valvectomy, and interrupting antegrade pulmonary blood flow...
January 2018: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/29304150/non-invasive-assessment-of-cerebral-oxygenation-a-comparison-of-retinal-and-transcranial-oximetry
#17
Karel Van Keer, Jan Van Keer, João Barbosa Breda, Vahid Nassiri, Cathy De Deyne, Cornelia Genbrugge, Luís Abegão Pinto, Ingeborg Stalmans, Evelien Vandewalle
BACKGROUND: To investigate the correlation between cerebral (SO2-transcranial), retinal arterial (SaO2-retinal) and venous (SvO2-retinal) oxygen saturation as measured by near-infrared spectroscopy (NIRS) and retinal oximetry respectively. METHODS: Paired retinal and cerebral oxygen saturation measurements were performed in healthy volunteers. Arterial and venous retinal oxygen saturation and diameter were measured using a non-invasive spectrophotometric retinal oximeter...
2018: PloS One
https://www.readbyqxmd.com/read/29302896/comparison-of-the-accuracy-of-noninvasive-hemoglobin-monitoring-for-preoperative-evaluation-between-adult-and-pediatric-patients-a-retrospective-study
#18
Yong-Hee Park, Seho Lim, Hyun Kang, Hwa-Yong Shin, Chong Wha Baek, Young Cheol Woo
We measured noninvasive hemoglobin (SpHb) levels during the pre-anesthesia visit in patients planning elective surgery. Differences between SpHb and laboratory-measured hemoglobin (Hblab) were compared between adult and pediatric patients. In the pre-anesthesia visiting office, we routinely monitor noninvasive Hb levels with oxygen saturation and heart rate using Masimo Radical-7® Pulse CO-Oximetry (Masimo Corp., Irvine, CA, USA). We attached the R1 20 (body weight, 10-50 kg) or R1 25 (body weight > 30 kg) probe on the index finger...
January 4, 2018: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29300699/a-self-calibrated-tissue-viability-sensor-for-free-flap-monitoring
#19
Melissa Berthelot, Guang-Zhong Yang, Benny Lo
In fasciocutaneous free flap surgery, close postoperative monitoring is crucial for detecting flap failure, as around 10% of cases require additional surgery due to compromised anastomosis. Different biochemical and biophysical techniques have been developed for continuous flap monitoring, however, they all have shortcoming in terms of reliability, elevated cost, potential risks to the patient, and inability to adapt to the patient's phenotype. A wearable wireless device based on near infrared spectroscopy has been developed for continuous blood flow and perfusion monitoring by quantifying tissue oxygen saturation ()...
January 2018: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/29297372/detailing-the-cardiovascular-profile-in-shock-patients
#20
REVIEW
Daniel De Backer
Evaluation of the cardiovascular profile of critically ill patients is one of the most important actions performed in critically ill patients. It allows recognition that the patient is in shock and characterization of the type of circulatory failure. This step is crucial to initiate supportive interventions and to cure the cause responsible for the development of shock. Evaluation of tissue perfusion allows identification of the patient insufficiently resuscitated and also to trigger therapeutic interventions...
December 28, 2017: Critical Care: the Official Journal of the Critical Care Forum
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