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venous physiology

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https://www.readbyqxmd.com/read/28328592/status-asthmaticus-and-central-herniation-a-case-for-multidisciplinary-critical-care
#1
Joelle B Karlik, Tristan Stani, Stephanie Nonas, Aclan Dogan, Ansgar Brambrink
A 24-year-old woman with history of asthma was intubated emergently for acute status asthmaticus triggered by acute respiratory syncytial virus infection and treated with permissive hypercapnia. Her ventilation was complicated by auto-positive end-expiratory pressure and elevated peak airway, plateau, and central venous pressures. On hospital day 2, she was noted to have anisocoria. Imaging showed diffuse cerebral edema with central herniation. Difficult ventilation and hypercapnia directly contributed to her severe cerebral edema...
March 15, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28328586/percutaneous-isolated-hepatic-perfusion-hemodynamic-monitoring-and-goal-directed-anesthetic-management-a-case-report
#2
Oscar Martin-Delgado, Miguel Rodriguez, Andres Lopez, Miguel A Reina, Emilio De Vicente, Yolanda Quijano, Antonio Echenagusia, Juan A Martinez
The percutaneous isolated hepatic perfusion utilizes a venovenous bypass to administer high-dose chemotherapy exclusively in the liver, getting depurated through a hemofilter before returning to the systemic circulation. The hepatic perfusion is managed under general anesthesia and invasive monitoring as a result of very abrupt changes in venous return and vascular resistances because of the isolation of the hepatic territory and absorption of circulating catecholamines by the hemofilter. We report a case in which we describe the technique, physiologic implications, anesthetic, and goal-directed hemodynamic management for this procedure...
March 15, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28325811/a-theoretical-and-practical-approach-to-defining-adequate-oxygenation-in-the-preterm-newborn
#3
REVIEW
Chad C Andersen, Nicolette A Hodyl, Haresh M Kirpalani, Michael J Stark
John Scott Haldane recognized that the administration of supplemental oxygen required titration in the individual. Although he made this observation in adults, it is equally applicable to the preterm newborn. But how, in practice, can the oxygen requirements in the preterm newborn be determined to avoid the consequences of too little and too much oxygen? Unfortunately, the current generation of oxygen saturation trials in preterm newborns guides saturation thresholds rather than individual oxygen requirements...
March 21, 2017: Pediatrics
https://www.readbyqxmd.com/read/28320993/intractable-back-pain-after-coil-embolization-of-giant-veno-venous-collaterals-in-a-patient-with-fontan-circulation
#4
Seigo Okada, Masahiro Kamada, Naomi Nakagawa, Yukiko Ishiguchi, Yuji Moritoh, Mayuko Shohi, Kengo Okamoto, Shunji Hasegawa, Shouichi Ohga
Veno-venous collaterals are sometimes seen in patients after the Fontan procedure. A 28-year-old female with tricuspid atresia who underwent the Fontan procedure had oxygen desaturation due to a giant veno-venous collateral. Coil embolization was performed for the collateral. After the procedure, she complained of severe back pain. Anti-inflammatory analgesics and steroids were not effective, although carbamazepine promptly relieved the intractable pain. Treatment-related pain after coil embolization for veno-venous collaterals in patients with Fontan physiology is quite rare, although cardiologists must recognize a critical condition to be differentiated from vascular occlusion...
March 21, 2017: International Heart Journal
https://www.readbyqxmd.com/read/28319252/physiologic-reduction-of-hepatic-venous-blood-flow-by-the-valsalva-maneuver-decreases-liver-stiffness
#5
Selcan Ipek-Ugay, Heiko Tzschätzsch, Jürgen Braun, Thomas Fischer, Ingolf Sack
OBJECTIVES: Liver stiffness increases after intake of food or water, suggesting that hepatic venous blood flow affects the results of elastographic measurements. This study investigated the correlation between in vivo liver stiffness and hepatic blood flow using the Valsalva maneuver for reducing intrahepatic venous blood flow. METHODS: Intrahepatic changes in venous blood flow were assessed by sonography based on the pulsed wave Doppler velocity, vessel diameter assessment, and blood flow volume measurements in the portal vein and right hepatic vein...
March 20, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28299447/markers-of-physiological-stress-during-exercise-under-conditions-of-normoxia-normobaric-hypoxia-hypobaric-hypoxia-and-genuine-high-altitude
#6
David Richard Woods, John Paul O'Hara, Christopher John Boos, Peter David Hodkinson, Costas Tsakirides, Neil Edward Hill, Darren Jose, Amanda Hawkins, Kelly Phillipson, Antonia Hazlerigg, Nicola Arjomandkhah, Liam Gallagher, David Holdsworth, Mark Cooke, Nicholas Donald Charles Green, Adrian Mellor
PURPOSE: To investigate whether there is a differential response at rest and following exercise to conditions of genuine high altitude (GHA), normobaric hypoxia (NH), hypobaric hypoxia (HH), and normobaric normoxia (NN). METHOD: Markers of sympathoadrenal and adrenocortical function [plasma normetanephrine (PNORMET), metanephrine (PMET), cortisol], myocardial injury [highly sensitive cardiac troponin T (hscTnT)], and function [N-terminal brain natriuretic peptide (NT-proBNP)] were evaluated at rest and with exercise under NN, at 3375 m in the Alps (GHA) and at equivalent simulated altitude under NH and HH...
March 15, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28296647/intra-and-inter-rater-reliability-of-lower-leg-waterplethysmography-bioelectrical-impedance-and-muscle-twitch-force-for-the-use-in-standing-work-evaluation
#7
Rudolf Wall, Oliwia Lips, Robert Seibt, Monika Rieger, Benjamin Steinhilber
OBJECTIVES: Prolonged standing is associated with multiple risk factors for musculoskeletal and venous disorders. Basic understanding of prolonged standing physiology is lacking. We therefore plan to investigate the influence of multiple hours standing on lower limb oedema measured by waterplethysmography (WP) and bioelectrical impedance (BI) and lower leg musle fatigue using muscle twitch force (MTF). In order to interpret our results, test-retest and inter-rater reliability of these measurement methods was evaluated first...
March 15, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28290964/anabolic-adaptations-occur-in-conscripts-during-basic-military-training-despite-high-prevalence-of-vitamin-d-deficiency-and-decrease-in-iron-status
#8
Vahur Ööpik, Saima Timpmann, Leho Rips, Indrek Olveti, Kersti Kõiv, Martin Mooses, Hanno Mölder, Ahti Varblane, Hele-Reet Lille, Helena Gapeyeva
INTRODUCTION: In Estonian Defense Forces that are drawn up on the basis of the conscription model considerable numbers of young men are prematurely discharged from military service for medical reasons, but causes leading to premature dropout of conscripts have not been systematically studied. However, one of the factors involved could be relatively demanding physical training that starts at the beginning of military service in the form of basic military training (BMT). Cumulative training and nontraining stresses experienced by conscripts during BMT may exceed their physiological adaptability and increase the probability of becoming prematurely discharged...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28289372/improved-quantification-of-cerebral-vein-oxygenation-using-partial-volume-correction
#9
Phillip G D Ward, Audrey P Fan, Parnesh Raniga, David G Barnes, David L Dowe, Amanda C L Ng, Gary F Egan
Purpose: Quantitative susceptibility mapping (QSM) enables cerebral venous characterization and physiological measurements, such as oxygen extraction fraction (OEF). The exquisite sensitivity of QSM to deoxygenated blood makes it possible to image small veins; however partial volume effects must be addressed for accurate quantification. We present a new method, Iterative Cylindrical Fitting (ICF), to estimate voxel-based partial volume effects for susceptibility maps and use it to improve OEF quantification of small veins with diameters between 1...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28274021/pharmaco-penile-duplex-ultrasonography-in-the-evaluation-of-erectile-dysfunction
#10
Phani Chakravarty Mutnuru, Harshavardhana Kuruba Ramanjaneyulu, Rammurti Susarla, Jyotsna Yarlagadda, Rahul Devraj, Prabakaran Palanisamy
INTRODUCTION: The National Institute of Health defined 'erectile dysfunction' as the persistent inability to achieve and/or to maintain an erection for a satisfactory sexual performance. In last few years, the concept of erectile dysfunction has evolved from that of a disorder referred to as 'impotence' which used to be considered predominantly psychogenic to that of 'Erectile Dysfunction' (ED), a well understood physiologic result of multiple risk factors, both psychological and organic...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28271677/can-measurement-of-progesterone-estradiol-and-prolactin-by-immunoassay-be-interchanged-a-comparison-of-the-roche-cobas-e601-vs-abbott-architect-i2000sr
#11
Lianli Yin, Xiang Chen, Yinghua Tang, Yifan Sun
BACKGROUND: Progesterone is a reliable indicator of either natural or induced ovulation, and it plays an important role in preparing for implantation in the uterus and maintaining pregnancy. Estradiol is the most powerful natural estrogen in humans. It adjusts reproductive function in females and, with progesterone, maintains a pregnancy. Prolactin is also an important indicator, and its major physiological action is the initiation and maintenance of lactation in women. Architect i2000sr and Cobas e601 are automated immunoassay systems that are widely used to measure progesterone, estradiol, and prolactin concentrations in the blood...
March 1, 2017: Clinical Laboratory
https://www.readbyqxmd.com/read/28266961/thoracic-manifestations-of-klippel-trenaunay-syndrome
#12
Mark M Hammer, Wallace T Miller
Klippel-Trenaunay syndrome (KTS) is a congenital disorder characterized by venous malformations and a predisposition to pulmonary embolism. We reviewed the imaging findings of 7 adult patients with KTS who underwent thoracic CT. While the superficial manifestations of KTS predominantly affect the extremities, patients frequently develop abnormalities of the pulmonary arterial system, particularly chronic thromboembolic pulmonary hypertension. Additionally, some patients are seen to develop pulmonary arteriolar aneurysms; the physiologic significance of this finding is unknown at this time...
March 6, 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28262755/clinical-characteristics-and-prognosis-of-cerebral-venous-thrombosis-in-chinese-women-during-pregnancy-and-puerperium
#13
Zhu-Wei Liang, Wan-Li Gao, Li-Min Feng
Due to the specific physiology associated with pregnancy and puerperium, cerebral venous sinus thrombosis (CVT) may manifest different characteristics. This study aimed to identify the clinical manifestations and prognosis of pregnancy-associated CVT. A total of 43 pregnancy-associated CVT patients were enrolled. We analysed the clinical presentations of the disease and performed a multivariate logistic regression analysis to determine which variables were associated with prognosis. Our descriptive results showed the following: 1) the incidence was 202 per 100,000 deliveries, and the mortality rate was 11...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28262243/pitfalls-in-the-diagnostic-management-of-pulmonary-embolism-in-pregnancy
#14
Cécile Tromeur, Liselotte M van der Pol, Frederikus A Klok, Francis Couturaud, Menno V Huisman
Women are at increased risk of venous thromboembolism (VTE) during pregnancy and VTE remains one of the main causes of maternal mortality in developed countries (Konstantinides SV, et al. Eur Heart J 2014; 35(43):3033-69, 69a-69k). Although an accurate diagnosis of acute pulmonary embolism (PE) in pregnant patients is thus of crucial importance, the diagnostic management of suspected PE is challenging for this specific patient category. As D-dimer levels increase physiologically throughout pregnancy, the optimal D-dimer threshold to rule out PE during pregnancy remains unknown...
March 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28255210/postpartum-varicose-veins-supplementation-with-pycnogenol-or-elastic-compression-a-12-month-follow-up
#15
Gianni Belcaro, Mark Dugall, Roberta Luzzi, Edmondo Ippolito, M Rosaria Cesarone
This open registry aimed to evaluate the clinical evolution of postpartum varicose veins (VVs), in healthy women after the second pregnancy, how these veins regain shape and competence, and possible treatments. The registry included two groups of women: (1) those who used elastic compression stockings, and (2) who used an oral venotonic agent (Pycnogenol, 100 mg/d). A total of 12 evaluation targets were established. Minor symptoms were scored in an analogue scale line. A visual analogue scale line evaluated the overall satisfaction relative to elastic compression or Pycnogenol...
March 2017: International Journal of Angiology: Official Publication of the International College of Angiology, Inc
https://www.readbyqxmd.com/read/28254456/linking-brain-vascular-physiology-to-hemodynamic-response-in-ultra-high-field-mri
#16
Kâmil Uludağ, Pablo Blinder
Functional MRI using blood oxygenation level-dependent (BOLD) contrast indirectly probes neuronal activity via evoked cerebral blood volume (CBV) and oxygenation changes. Thus, its spatio-temporal characteristics are determined by vascular physiology and MRI parameters. In this paper, we focus on the spatial distribution and time course of the fMRI signal and their magnetic field strength dependence. Even though much is still unknown, the following consistent picture is emerging: a) For high spatial resolution imaging, fMRI contrast-to-noise increases supra-linearly with field strength...
February 22, 2017: NeuroImage
https://www.readbyqxmd.com/read/28254226/preliminary-report-of-altered-insulin-secretion-pattern-in-monochorionic-twin-pregnancies-complicated-with-selective-intrauterine-growth-restriction
#17
Yao-Lung Chang, Tzu-Hao Wang, Seham M Abufraijeh, Shuenn-Dyh Chang, An-Shine Chao, Peter C C Hsieh
OBJECTIVE: Fetuses with intrauterine growth restriction (IUGR) have adaptive hormonal changes including changes in insulin, which may increase their future risks for developing diabetes mellitus. This study compared cord blood insulin concentrations in IUGR and appropriate for gestational age (AGA) fetuses in a monochorionic (MC) twin model. MATERIALS AND METHODS: Ten pairs were classified as selective IUGR (sIUGR) based on having one twin weight below the 10th percentile and with an intertwin birth weight discordance>20%...
February 2017: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28247972/clinical-relevance-of-hypercoagulability-and-possible-hypofibrinolysis-associated-with-estrone-and-estriol
#18
Albe C Swanepoel, Priyaa Naidoo, Vance G Nielsen, Etheresia Pretorius
Estrone (E1 ) and Estriol (E3 ) are endogenous female hormones, present in increased concentrations during female specific physiological processes (menopause and pregnancy respectively) that are associated with increased venous thrombotic risk. These hormones are also used as hormone therapies that are also associated with increased thromboembolism risk. Viscoelastic analysis revealed no significant difference to clot formation after hormone addition, however morphological analysis showed that the addition of both E1 and E3 result in fibrin clots composed of thinner fibrin fibers arranged in dense matted networks...
March 1, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28235859/an-international-collaboration-studying-the-physiological-and-anatomical-cerebral-effects-of-carbon-dioxide-during-head-down-tilt-bed-rest-the-spacecot-study
#19
Karina Marshall-Goebel, Edwin Mulder, Dorit Donoviel, Gary Strangman, Jose I Suarez, Chethan Venkatasubba Rao, Petra Frings-Meuthen, Ulrich Limper, Jörn Rittweger, Eric M Bershad
Exposure to the microgravity environment results in various adaptive and maladaptive physiological changes in the human body, with notable ophthalmic abnormalities developing during 6-month missions on the International Space Station (ISS). These findings have led to the hypothesis that the loss of gravity induces a cephalad fluid shift, decreased cerebral venous outflow and increased intracranial pressure (ICP) which may be further exacerbated by increased ambient carbon dioxide (CO2) levels on the ISS. Here we describe the "SPACECOT study" (Studying the Physiological and Anatomical Cerebral Effects of CO2 during Head-Down Tilt), a randomized, double-blinded cross-over design study with two conditions: 29 h of 12° head-down tilt (HDT) with ambient air and 29 h of 12° HDT with 0...
February 23, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28222581/a-comparison-of-the-physiological-demands-imposed-by-competing-in-a-half-marathon-vs-a-marathon
#20
Juan Del Coso, Juan J Salinero, Beatriz Lara, Javier Abián-Vicén, César Gallo-Salazar, Francisco Areces
BACKGROUND: While there is widespread scientific information about the physiological challenges imposed on elite endurance runners during competitions, the information regarding the amateur population is scarce. The aim of this study was to compare the physical and physiological load imposed by competing in a real half-marathon vs a marathon race. METHODS: From a larger group of participants, we selected 22 experienced runners who were matched in pairs (11 marathoners and 11 half-marathoners) for age and anthropometric data...
February 21, 2017: Journal of Sports Medicine and Physical Fitness
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