7,076 results match your criteria high tidal

Modeling Floodplain Inundation, Circulation and Residence Time Under Changing Tide and Sea-Levels.

Estuaries Coast 2020 Jun;43:693-707

Department of Biology and Geology, University of South Carolina Aiken, SC 29801, USA.

Sea-level rise will have unknown effects on the structure and function of valuable tidal freshwater floodplains. One reason for this knowledge gap is our poor constraint on the physical controls on complex floodplain inundation and circulation processes. Here, a high-resolution light detection and ranging (lidar) digital elevation model (DEM) is applied to fine-scale numerical simulations of flow and tracer exchange in a 0. Read More

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Sea-trial verification of a novel system for monitoring biofouling and testing anti-fouling coatings in highly energetic environments targeted by the marine renewable energy industry.

Biofouling 2021 Jun 14:1-19. Epub 2021 Jun 14.

International Centre for Island Technology, Heriot Watt University Orkney Campus, Robert Rendall Building-ORIC, Stromness, Scotland.

A novel system was developed to deploy settlement panels to monitor biofouling growth and evaluate antifouling coatings at depths representative of operational conditions of full-scale marine renewable energy devices. Biofouling loading, species diversity, and succession were assessed at depths ranging from 25-40 m at four tests sites in Orkney (UK) featuring extreme wave and tidal current exposure to more sheltered conditions. Evaluations were carried out over a period of 8 months with intermediate retrieval of samples after 3 months. Read More

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Sharks surf the slope: Current updrafts reduce energy expenditure for aggregating marine predators.

J Anim Ecol 2021 Jun 13. Epub 2021 Jun 13.

MARBEC, Univ Montpellier, CNRS, IFREMER, IRD, Sète, France.

An animal's energy landscape considers the power requirements associated with residing in or moving through habitats. Within marine environments, these landscapes can be dynamic as water currents will influence animal power requirements and can change rapidly over diel and tidal cycles. In channels and along slopes with strong currents, updraft zones may reduce energy expenditure of negatively buoyant fishes that are also obligate swimmers. Read More

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Tidal volume measurements in the delivery room in preterm infants requiring positive pressure ventilation via endotracheal tube-feasibility study.

J Perinatol 2021 Jun 10. Epub 2021 Jun 10.

Division of Newborn Medicine, Department of Pediatrics, Tufts Children's Hospital, Boston, MA, USA.

Objective: Current delivery room (DR) resuscitation utilizes pressure-limited devices without tidal volume (TV) measurements. Clinicians use chest expansion as a surrogate, which is a poor indicator of TV. TV in early life can be highly variable due to rapidly changing lung compliance. Read More

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Reference equations for tidal breathing parameters using structured light plethysmography.

ERJ Open Res 2021 Apr 7;7(2). Epub 2021 Jun 7.

Lung Function and Sleep, Queen Elizabeth Hospital, Birmingham, UK.

Tidal breathing measurements can be used to identify changes in respiratory status. Structured light plethysmography (SLP) is a non-contact tidal breathing measurement technique. Lack of reference equations for SLP parameters makes clinical decision-making difficult. Read More

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Target volume-guarantee in high-frequency oscillatory ventilation for preterm respiratory distress syndrome: Low volumes and high frequencies lead to adequate ventilation.

Pediatr Pulmonol 2021 Jun 9. Epub 2021 Jun 9.

Division of Neonatology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.

Background And Objectives: Respiratory distress syndrome (RDS) and ventilation-induced lung injury lead to significant morbidity in preterm infants. High-frequency oscillatory ventilation with volume-guarantee (HFOV-VG) has been used as a rescue therapy and might lead to lower rates of death and bronchopulmonary dysplasia, especially when using low tidal volumes and high frequencies. The aim of the study was to define HFOV-VG parameters leading to adequate ventilation in the first 72 h of preterm RDS using a low volume and high-frequency strategy. Read More

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Tidally modified western boundary current drives interbasin exchange between the Sea of Okhotsk and the North Pacific.

Sci Rep 2021 Jun 8;11(1):12037. Epub 2021 Jun 8.

Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan.

The interbasin exchange between the Sea of Okhotsk and the North Pacific governs the intermediate water ventilation and fertilization of the nutrient-rich subpolar Pacific, and thus has an enormous influence on the North Pacific. However, the mechanism of this exchange is puzzling; current studies have not explained how the western boundary current (WBC) of the subarctic North Pacific intrudes only partially into the Sea of Okhotsk. High-resolution models often exhibit unrealistically small exchanges, as the WBC overshoots passing by deep straits and does not induce exchange flows. Read More

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OLA strategy for ARDS: Its effect on mortality depends on achieved recruitment (PaO/FiO) and mechanical power. Systematic review and meta-analysis with meta-regression.

Med Intensiva (Engl Ed) 2021 Jun 5. Epub 2021 Jun 5.

PICU, Children's Hospital Los Angeles, California, USA.

Objective: The "Open Lung Approach" (OLA), that includes high levels of positive end-expiratory pressure coupled with limited tidal volumes, is considered optimal for adult patients with ARDS. However, many previous meta-analyses have shown only marginal benefits of OLA on mortality but with statistical heterogeneity. It is crucial to identify the most likely moderators of this effect. Read More

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Protective ventilation and outcomes of critically ill patients with COVID-19: a cohort study.

Ann Intensive Care 2021 Jun 7;11(1):92. Epub 2021 Jun 7.

Divisao de Pneumologia, Instituto Do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, Brazil.

Background: Approximately 5% of COVID-19 patients develop respiratory failure and need ventilatory support, yet little is known about the impact of mechanical ventilation strategy in COVID-19. Our objective was to describe baseline characteristics, ventilatory parameters, and outcomes of critically ill patients in the largest referral center for COVID-19 in Sao Paulo, Brazil, during the first surge of the pandemic.

Methods: This cohort included COVID-19 patients admitted to the intensive care units (ICUs) of an academic hospital with 94 ICU beds, a number expanded to 300 during the pandemic as part of a state preparedness plan. Read More

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Tracheal tube obstruction as a complication of transoesophageal echocardiography.

Anaesth Rep 2021 Jan-Jun;9(1):110-113. Epub 2021 May 25.

Department of Cardiothoracic Anaesthesia, Critical Care and ECMO Wythenshawe Hospital Manchester UK.

Complications of transoesophageal echocardiography are numerous and may have serious consequences. We present the case of a 31-year-old woman with postoperative airway obstruction secondary to a transesophageal echocardiography probe. The patient had been admitted with acute myocarditis and required temporary mechanical support with a biventricular assist device. Read More

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Supraglottic Airway Devices for Elective Pediatric Anesthesia: I-gel versus Air-Q, Which is the Best?

Anesth Essays Res 2020 Jul-Sep;14(3):461-466. Epub 2021 Mar 22.

Department of Anesthesia and ICU, Faculty of Medicine, Ain Shams University, Cairo, Egypt.

Objectives: The objectives of the study were to compare the insertion facility, the effect on hemodynamic parameters, and effective ventilation using I-gel versus Air-Q supraglottic airway devices (SADs) for pediatric patients undergoing short-duration surgical procedures.

Patients And Methods: One hundred and fifty children aged 3-10 years were randomly divided into two equal groups: Group I received I-gel and Group Q received Air-Q SAD. All patients were anesthetized by sevoflurane inhalation using a face mask without neuromuscular blockade. Read More

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Variation in Early Management Practices in Moderate-to-Severe Acute Respiratory Distress Syndrome in the United States.

Chest 2021 Jun 2. Epub 2021 Jun 2.

Temple University Hospital, Philadelphia, PA.

Background: While specific interventions have previously demonstrated benefit in patients with the Acute Respiratory Distress Syndrome (ARDS), use of these interventions is inconsistent, and patient mortality remains high. The impact of variability in center management practices on ARDS mortality rates remains unknown.

Research Question: What is the impact of treatment variability on mortality in patients with moderate-to-severe ARDS in the United States (US)?

Study Design And Methods: We conducted a multicenter, observational cohort study of mechanically ventilated adults with ARDS and PaO/FiO< 150 on positive end expiratory pressure (PEEP) > 5 cm HO, who were admitted to 29 US centers between October 1, 2016 and April 30, 2017. Read More

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Biogeochemical functioning of an urbanized tropical estuary: Implementing the generic C-GEM (reactive transport) model.

Sci Total Environ 2021 Aug 22;784:147261. Epub 2021 Apr 22.

Université Libres de Bruxelles, Department of Geoscience, Environment & Society (DGES), CP 160/02, 1050 Brussels, Belgium.

Estuaries are amongst the most productive ecosystems of the land ocean continuum, but they are also under high anthropic pressures due to coastal urbanization. Too sparse observations have hindered the understanding of complex interactions between water quality and estuarine hydrodynamics and biogeochemical transformations. Until now, estuarine modelling studies have mainly focused on temperate estuarine systems in industrialized countries. Read More

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Succession pattern and phylotype analysis of microphytobenthic communities in a simulated oil spill seagrass mesocosm experiment.

Sci Total Environ 2021 Aug 20;784:147053. Epub 2021 Apr 20.

Department of Marine and Ecological Sciences, Florida Gulf Coast University, Fort Myers, FL, USA; Alabama Center for Ecological Resilience (ACER), Dauphin Island, Alabama, United States; School of Geosciences, University of South Florida, Tampa, FL 33620, USA. Electronic address:

Microphytobenthic communities play a significant role in nutrient modulation, sediment stabilization, and primary production in seagrass beds, which provide various ecosystem services. We hypothesized that microphytobenthic communities in sediments of chronically oil-exposed seagrass beds will exhibit increased resiliency to stressors associated with oil exposure as opposed to seagrass beds never exposed to oil spills. We prepared 14-liter seawater mesocosms, each containing a submersed macrophyte Ruppia maritima collected from the Chandeleur Islands, Louisiana, and Estero Bay, Florida. Read More

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Development and Validation of a Machine-Learning Model for Prediction of Extubation Failure in Intensive Care Units.

Front Med (Lausanne) 2021 17;8:676343. Epub 2021 May 17.

Department of Critical Care Medicine, Zhongshan Hospital, Fudan University, Shanghai, China.

Extubation failure (EF) can lead to an increased chance of ventilator-associated pneumonia, longer hospital stays, and a higher mortality rate. This study aimed to develop and validate an accurate machine-learning model to predict EF in intensive care units (ICUs). Patients who underwent extubation in the Medical Information Mart for Intensive Care (MIMIC)-IV database were included. Read More

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Effect of hemoglobin content on cerebral oxygen saturation during surgery for scoliosis in pediatric patients.

BMC Anesthesiol 2021 Jun 1;21(1):165. Epub 2021 Jun 1.

Department of Transfusion Medicine, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China.

Background: Although regional cerebral oxygen saturation (rScO) monitoring has been widely used in clinical practice, the relationship between hemoglobin (dHB) content and rScO is incompletely understood. The aim of this study was to analyze the effect of hemoglobin content on rScO in pediatric patients undergoing general anesthesia for correction of scoliosis.

Methods: Ninety-two pediatric patients aged 3 to 14 years undergoing scoliosis correction surgery were enrolled. Read More

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Changes of Heart Rate and Lipid Composition in Mytilus Edulis and Modiolus Modiolus Caused by Crude Oil Pollution and Low Salinity Effects.

J Xenobiot 2021 May 14;11(2):46-60. Epub 2021 May 14.

Karelian Research Center of RAS, Institute of Biology, Pushkinskaya St., 11, 185910 Petrozavodsk, Russia.

Blue mussels, , inhabiting tidal zones, are naturally exposed to fluctuating environmental conditions (e.g., fluctuations in temperature and salinities), while horse mussels, , live under relatively invariable shelf water conditions. Read More

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Breath-Triggered Drug Release System for Preterm Neonates.

Pharmaceutics 2021 May 4;13(5). Epub 2021 May 4.

Division of Translational Biomedical Engineering, Fraunhofer Institute for Toxicology and Experimental Medicine ITEM, 30625 Hannover, Germany.

A major disadvantage of inhalation therapy with continuous drug delivery is the loss of medication during expiration. Developing a breath-triggered drug release system can highly decrease this loss. However, there is currently no breath-triggered drug release directly inside the patient interface (nasal prong) for preterm neonates available due to their high breathing frequency, short inspiration time and low tidal volume. Read More

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Effects of Respiratory Muscle Training on Baroreflex Sensitivity, Respiratory Function, and Serum Oxidative Stress in Acute Cervical Spinal Cord Injury.

J Pers Med 2021 May 5;11(5). Epub 2021 May 5.

Neurology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 833, Taiwan.

Background: respiratory complications are a leading cause of morbidity and mortality in individuals with spinal cord injury (SCI). We examined the effects of respiratory muscle training (RMT) in patients with acute cervical SCI.

Methods: this prospective trial enrolled 44 adults with acute cervical SCI, of which twenty received RMT and twenty-four did not receive RMT. Read More

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Cardiopulmonary values and organ blood flows before and during heat stress: data in nine subjects at rest in the upright position.

Can J Physiol Pharmacol 2021 Jun 1. Epub 2021 Jun 1.

Université de Montréal, 5622, Environmental and Occupational Health, School of Public Health, Montreal, Quebec, Canada.

Physiological changes associated with thermoregulation can influence the kinetics of chemicals in the human body, such as alveolar ventilation (VA) and redistribution of blood flow to organs. In this study, the influence of heat stress on various physiological parameters was evaluated in nine male volunteers during sessions of exposure to wet blub globe temperatures (WBGT) of 21, 25 and 30°C for four hours. Skin and core temperatures and more than twenty cardiopulmonary parameters were measured. Read More

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Ten days of high dietary sodium does not impair cerebral blood flow regulation in healthy adults.

Auton Neurosci 2021 May 27;234:102826. Epub 2021 May 27.

Department of Kinesiology & Applied Physiology, University of Delaware, Newark, DE, United States of America. Electronic address:

High dietary sodium impairs cerebral blood flow regulation in rodents and is associated with increased stroke risk in humans. However, the effects of multiple days of high dietary sodium on cerebral blood flow regulation in humans is unknown. Therefore, the purpose of this study was to determine whether ten days of high dietary sodium impairs cerebral blood flow regulation. Read More

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Comparison of Actual Performance in the Flow and Fraction of Inspired O among Different High-Flow Nasal Cannula Devices: A Bench Study.

Can Respir J 2021 4;2021:6638048. Epub 2021 May 4.

Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, No. 37 Guoxue Alley, Chengdu 610041, Sichuan, China.

Background: High-flow nasal cannula (HFNC) oxygen therapy has been recommended for use in coronavirus disease 2019 (COVID-19) patients with acute respiratory failure and many other clinical conditions. HFNC devices produced by different manufacturers may have varied performance. Whether there is a difference in these devices and the extent of the differences in performance remain unknown. Read More

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crAssphage as a human molecular marker to evaluate temporal and spatial variability in faecal contamination of urban marine bathing waters.

Sci Total Environ 2021 May 18;789:147828. Epub 2021 May 18.

UCD School of Biomolecular and Biomedical Science, UCD Earth Institute, UCD Conway Institute, University College Dublin, Ireland. Electronic address:

Bathing water quality may be negatively impacted by diffuse pollution arising from urban and agricultural activities and wildlife, it is therefore important to be able to differentiate between biological and geographical sources of faecal pollution. crAssphage was recently described as a novel human-associated microbial source tracking marker. This study aimed to evaluate the performance of the crAssphage marker in designated bathing waters. Read More

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Influences on tidal channel and aquaculture shrimp pond water chemical composition in Southwest Bangladesh.

Geochem Trans 2021 May 28;22(1). Epub 2021 May 28.

Department of Earth and Environmental Sciences, Vanderbilt University, 5726 Stevenson Center, 7th floor, Nashville, TN, 37240, USA.

Detailed geochemical studies of both major and minor elements in Bangladesh surface waters are sparse, particularly in shrimp aquaculture pond environments. Therefore, water samples from shrimp aquaculture ponds and tidal channels were collected in high precipitation (July) and low precipitation (May) months from 2018-2019 in Southwest Bangladesh and analyzed for complete water chemistry. Selenium (Se) and arsenic (As) were elevated above WHO guidelines in 50% and ~ 87% of samples, respectively, but do not show any recognizable spatial patterns. Read More

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Prehospital End-Tidal CO: A Superior Marker for Mortality Risk in the Acutely Injured Patient.

Am Surg 2021 May 28:31348211023401. Epub 2021 May 28.

Department of Surgery, 22442Carolinas Medical Center, Charlotte, NC, USA.

Background: Emergency medical personnel must expeditiously triage acutely injured patients to the appropriate medical facility. Efficient and objective variables to facilitate this process and provide information to the receiving trauma center are needed. Currently, multiple variables are used to prognosticate injury severity and risk of mortality including vital signs, mental status, lactate, and base excess. Read More

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Unravelling tidal effect on zooplankton community structure in a tropical estuary.

Environ Monit Assess 2021 May 27;193(6):362. Epub 2021 May 27.

Indian National Centre for Ocean Information Services, Ministry of Earth Sciences, Govt. of India, Hyderabad, 500090, India.

The variability in zooplankton density and species composition in response to tidal oscillations were investigated in the lesser saline upper reaches (E1) and higher saline lower reaches (E2) of the Mahanadi Estuary, located at the mouth of the third largest river in Indian Peninsula. This is the first of its kind high frequency observation over the tidal cycle ranging from highest high tide to lowest low tide in this estuary revealing dynamic variability of zooplankton assemblages. Zooplankton abundance was higher during high tide in comparison to low tide, irrespective of salinity regimes. Read More

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Ventilatory parameters measured during a physiological study of simulated powered air-purifying respirator failure in healthy volunteers.

Anaesth Intensive Care 2021 May 26:310057X20978982. Epub 2021 May 26.

Department of Anaesthesia, Austin Health, Melbourne, Australia.

Powered air-purifying respirators (PAPR) are a high level of respiratory personal protective equipment. Like all mechanical devices, they are vulnerable to failure. The precise physiological consequences of failure in live subjects have not previously been reported. Read More

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[Intraoperative Ventilation Approaches to One-lung Ventilation].

Anasthesiol Intensivmed Notfallmed Schmerzther 2021 May 26;56(5):329-341. Epub 2021 May 26.

The management of thoracic surgery patients is challenging to the anesthetist, since one-lung ventilation (OLV) includes at least two major conditions: sufficient oxygenation and lung protection. The first is mainly because the ventilation of one lung is stopped while perfusion to that lung continues; the latter is related to the fact that the whole ventilation is applied to only a single lung. Recommendations for maintaining the oxygenation and methods of lung protection may contradict each other (e. Read More

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Correlation of End-Tidal Carbon Dioxide with Arterial Carbon Dioxide in Mechanically Ventilated Neonates: A Scoping Review.

Glob Pediatr Health 2021 17;8:2333794X211016790. Epub 2021 May 17.

Graduate Program on Health Technology, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil.

Monitoring CO levels in intubated neonates is highly relevant in the face of complications associated with altered CO levels. Thus, this review aims to present the scientific evidence in the literature regarding the correlation between arterial carbon dioxide measured by non-invasive methods in newborns submitted to invasive mechanical ventilation. The search was carried out from January 2020 to January 2021, in the Scopus, Medline, The Cochrane Library, Web of Science, CINAHL and Embase databases. Read More

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Evidence-Based Guideline on Critical Patient Transport and Handover to ICU.

Anesthesiol Res Pract 2021 6;2021:6618709. Epub 2021 May 6.

Department of Anesthesia, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia.

The perioperative period is a time in which significant physiological change occurs. Improper transfer of information at this point can lead to medical errors. Planning and preparation for critical patient transport to ICU is vital to prevent adverse events. Read More

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