Quantity and quality of low flow in the East Fork San Jacinto and West Fork San Jacinto Rivers near Houston, Texas, June 24, 26, 1969

1970 ◽  
Author(s):  
J.C. Fisher ◽  
Guadalupe Ramos
Keyword(s):  
Low Flow ◽  
West Fork

Statistical and Data Mining Techniques for Understanding Water Quality Profiles in a Mining-Affected River Basin

2018 ◽  
Vol 9 (2) ◽  
pp. 1-19 ◽  
Author(s):  
Jose Simmonds ◽  
Juan A. Gómez ◽  
Agapito Ledezma
Keyword(s):  
Data Mining ◽  
Water Quality ◽  
River Basin ◽  
Suspended Solids ◽  
Water Quality Monitoring ◽  
High Flow ◽  
Quality Monitoring ◽  
Low Flow ◽  
Inverse Relation

This article contains a multivariate analysis (MV), data mining (DM) techniques and water quality index (WQI) metrics which were applied to a water quality dataset from three water quality monitoring stations in the Petaquilla River Basin, Panama, to understand the environmental stress on the river and to assess the feasibility for drinking. Principal Components and Factor Analysis (PCA/FA), indicated that the factors which changed the quality of the water for the two seasons differed. During the low flow season, water quality showed to be influenced by turbidity (NTU) and total suspended solids (TSS). For the high flow season, main changes on water quality were characterized by an inverse relation of NTU and TSS with electrical conductivity (EC) and chlorides (Cl), followed by sources of agricultural pollution. To complement the MV analysis, DM techniques like cluster analysis (CA) and classification (CLA) was applied and to assess the quality of the water for drinking, a WQI.

Bleomycin for orbital and peri-orbital veno-lymphatic malformations – A systematic review

2020 ◽  
pp. 159101992097251
Author(s):  
Khunsa Faiz ◽  
Stephanos Finitsis ◽  
Janice Linton ◽  
Jai Jai Shiva Shankar
Keyword(s):  
Systematic Review ◽  
Pulmonary Fibrosis ◽  
Vascular Malformations ◽  
Symptomatic Improvement ◽  
Low Flow ◽  
Cochrane Database ◽  
Objective Reduction ◽  
Retrospective Cohort Studies ◽  
Subjective Reduction

Background Orbital and peri-orbital venolymphatic malformations (VLM) are low flow vascular malformations. Intralesional bleomycin is now commonly being used to treat such malformations. Objective The purpose of this systematic review is to synthesize evidence on the safety and efficacy of bleomycin/pingyangmycin sclerotherapy for the treatment of orbital and peri-orbital VLM. Methods We searched Medline, Embase, Scopus and Cochrane database for studies reporting outcomes of bleomycin/pingyangmycin sclerotherapy for orbital and peri-orbital VLM between 1974 to April 5th, 2019. Nine retrospective cohort studies enrolling 132 patients were included. Two reviewers independently screened and extracted data and assessed the risk of bias. Predefined outcome measures were subjective and objective reduction of the lesion and associated complications. Results Subjective reduction of the lesions was seen in 96.2% of the studies. Objective reduction of the lesion and symptomatic improvement were reported in 91.6 and 95% of the studies respectively. Non responders were 9.0%. Minor adverse events were reported in 18.1% of the studies. Major complications like pulmonary toxicity or pulmonary fibrosis was not encountered in any of the included studies. Quality of evidence was generally low. Conclusion Bleomycin/pingyangmycin sclerotherapy is very effective and relatively safe for the treatment of orbital and periorbital VLM and is not associated with any major side effects including pulmonary fibrosis. Limitations: The systematic review is limited mainly due to low quality of the included studies with retrospective design.

Quality of life and clinical results after endovascular sclerotherapy: A comparison between intra- and extramuscular low-flow venous malformations

2020 ◽  
pp. 026835552096292
Author(s):  
Annamaria Weitz-Tuoretmaa ◽  
Leo Keski-Nisula ◽  
Riitta Rautio ◽  
Jussi Laranne
Keyword(s):  
Quality Of Life ◽  
Clinical Results ◽  
Post Treatment ◽  
Low Flow ◽  
Subjective Symptoms ◽  
Venous Malformations ◽  
University Hospitals ◽  
Mri Findings ◽  
Mri Scans

Background Based on clinical observations we hypothesized that patients with intramuscular venous malformations (VMs) did worse or needed more sclerotherapy sessions than patients with extramuscular VMs. Purpose To evaluate the difference in treatment and quality of life (QOL) results after Polidocanol sclerotherapy of intra- and extramuscular low-flow VMs. Material and methods Forty-one patients with a VM were treated with Polidocanol in two university hospitals. The results were retrospectively analyzed. Pre- and post-treatment magnetic resonance imaging (MRI) scans were compared. All patients completed a self-evaluating form on symptoms as well as a QOL questionnaire. The results were compared between two groups: intra- and extramuscular VM’s. Results No statistically significant differences between intra- and extramuscular groups concerning QOL and specific dimensions pain, functional problems or cosmetic appearance were found. Radiological changes in MRI examinations did not correlate with any of the subjective symptoms. 56% of the patients benefitted from the treatment according to patient self-evaluation. Conclusion In this material intramuscular VM’s responded to the treatment comparably to extramuscular malformations. Post-treatment MRI findings do not correlate with subjective symptoms or QOL results and thus, a routine post-treatment examination seems to be unwarranted. Subjective symptoms and QOL results are the most important parameters in evaluating the effectiveness of sclerotherapy.

scholarly journals Measurement of Regional Cerebral Blood Flow with Positron Emission Tomography: A Comparison of [15O]Water to [11C]Butanol with Distributed-Parameter and Compartmental Models

1993 ◽  
Vol 13 (5) ◽  
pp. 733-747 ◽  
Author(s):  
Robert P. Quarles ◽  
Mark A. Mintun ◽  
Kenneth B. Larson ◽  
Joanne Markham ◽  
Ann Mary MacLeod ◽  
...  
Keyword(s):  
Positron Emission Tomography ◽  
Visual Stimulation ◽  
Human Subjects ◽  
Volume Of Distribution ◽  
Emission Tomography ◽  
Low Flow ◽  
Distributed Parameter ◽  
Positron Emission ◽  
The One

To further our understanding of the best way to measure regional CBF with positron emission tomography (PET), we directly compared two candidate tracers ([15O]water and [11C]butanol, administered intravenously) and two popular implementations of the one-compartment (IC) model: the autoradiographic implementation representing a single PET measurement of tissue radioactivity over 1 min and a dynamic implementation representing a sequence of measurements of tissue radioactivity over 200 s. We also examined the feasibility of implementing a more realistic, and thus more complex, distributed-parameter (DP) model by assigning fixed values for all of its parameters other than CBF and tracer volume of distribution ( Vd), a requirement imposed by the low temporal resolution and statistical quality of PET data. The studies were performed in three normal adult human subjects during paired rest and visual stimulation. In each subject seven regions of interest (ROIs) were selected, one of which was the primary visual cortex. The corresponding ROI were anatomically equivalent in the three subjects. Regional CBF, Vd, tracer arrival delay, and dispersion were estimated for the dynamic data curves. A total of 252 parameter sets were estimated. With [11C]butanol both implementations of the IC model provided similar results ( r = 0.97). Flows estimated using the 1C models were lower (p < 0.01) with [15O]water than with [11C]butanol. In comparison with the IC model, the constrained version of the DP used in these studies performed inadequately, overestimating high flow and underestimating low flow with both tracers, possibly as the result of the necessity of assigning fixed values for all of its parameters other than CBF and Vd.

Impacts of climate change and socio-economic scenarios on flow and water quality of the Ganges, Brahmaputra and Meghna (GBM) river systems: low flow and flood statistics

2015 ◽  
Vol 17 (6) ◽  
pp. 1057-1069 ◽  
Author(s):  
P. G. Whitehead ◽  
E. Barbour ◽  
M. N. Futter ◽  
S. Sarkar ◽  
H. Rodda ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Economic Change ◽  
Low Flow ◽  
River Systems ◽  
Area Of Interest ◽  
The Ganges ◽  
Impacts Of Climate Change

The potential impacts of climate change and socio-economic change on flow and water quality in rivers worldwide is a key area of interest.

Quality of life after endovascular sclerotherapy of low-flow venous malformations: the efficacy of polidocanol compared with ethanol

2017 ◽  
Vol 59 (8) ◽  
pp. 946-952 ◽  
Author(s):  
Annamaria Weitz-Tuoretmaa ◽  
Leo Keski-Nisula ◽  
Riitta Rautio ◽  
Jussi Laranne
Keyword(s):  
Quality Of Life ◽  
Venous Malformation ◽  
Post Treatment ◽  
Low Flow ◽  
Venous Malformations ◽  
Limited Information ◽  
Ethanol Group ◽  
Clinical Complications ◽  
Ethanol Sclerotherapy

Background Limited information is available on mid-term results and quality of life (QOL) after endovascular sclerotherapy of venous malformations. Purpose To compare two agents—polidocanol and ethanol—with a focus on the influence on QOL after sclerotherapy. Material and Methods Forty-one consecutive patients with a venous malformation in the head and neck area or in the extremities were treated with polidocanol between 2008 and 2013. Pre- and post-treatment magnetic resonance imaging (MRI) scans were compared. All patients completed a self-evaluation form on symptoms as well as a QOL questionnaire. The results were compared with previously obtained material during 1991–2001, comprising 44 consecutive, similarly located venous malformation patients subject to ethanol sclerotherapy. Results No significant clinical complications were observed. Subjectively, 19 (46%) of the patients benefitted from the treatment. QOL results showed that 85% of patients had an index < 39 – where 0 represents the highest and 100 the lowest QOL. Patients in the ethanol group had marginally better overall post-treatment QOL results. Post-treatment MRI in 35 patients showed the size of the malformation unchanged in 19 (54%) patients, in ten (29%) there was a decrease (<50%) while in six (17%) the decrease was more significant (>50%). Post-treatment MRI results did not correlate with either subjective symptoms or QOL results. Conclusion Polidocanol sclerotherapy were found to be an effective, safe, and well tolerated treatment option for low flow venous malformations. Routine MRI for follow-up appears redundant and may be omitted.

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