A review on recent developments in the adsorption of surfactants from wastewater.

The pollution of the world's water resources is a growing issue which requires remediation. Surfactants used in many domestic and industrial applications are one of the emerging contaminants that require immediate attention. Treating water contaminated with surfactants using adsorption provides better performance when compared to other techniques. A variety of materials have been developed for adsorbing surfactants. Activated carbon is the most suitable adsorbent for removing surfactants but is expensive to synthesize and difficult to regenerate. Therefore, a variety of new adsorbents such as zeolites, nanomaterials, resins, biomaterials and clays have been developed as alternatives. The developed adsorbents are promising but considerable research is still required to develop highly efficient, economical, environment friendly and sustainable adsorbents to replace activated carbon. This paper critically reviews the characteristics of adsorbents, the performance of adsorbents, kinetics, isotherms and thermodynamics, mechanisms of adsorption, regeneration of adsorbents and future perspectives in the adsorption of surfactants. Developing novel adsorbents, testing adsorbents in real wastewaters and recycling the adsorbents are required in future studies in the removal of surfactants.

The treatment of nephrogenic systemic fibrosis with therapeutic plasma exchange.

BACKGROUND: Nephrogenic systemic fibrosis (NSF), also known as nephrogenic sclerosing dermopathy (NSD), is a rare progressive fibrosing disease associated with gadolinium based dyes in patients with renal disease. The exact pathophysiology is not well understood. Accepted treatments include corticosteroids, immune modulators, PUVA, rituximab and extracorporeal photopheresis (ECP). Apheresis is utilized when symptoms continue to progress. However, the paucity of centers offering ECP can be inhibitory to care. Small case reports have been published illustrating moderate treatment success with therapeutic plasma exchange (TPE). METHODS: Chart review found two patients; both were African-American women with systemic lupus erythematosus (SLE), status post renal transplant, who had biopsy documented NSF. The patients were still symptomatic, despite maximal medical management, so they underwent TPE series for symptom management. Medical therapy with immune modulators was continued in conjunction to TPE. Response to treatment was evaluated using subjective reporting to the primary care team. RESULTS: The patients reported significant improvements in subjective pain levels after TPE. Patient 1 reported decreased skin and contracture pain after the 3rd treatment, with similar results for a second series 6 months later. Patient 2 reported drastic improvement in pain symptoms and rarely required pain medication during hospital course. No adverse reactions occurred during treatment. CONCLUSIONS: TPE is a therapy option for patients with NSF without access to ECP. TPE was well-tolerated, easily assessable, and effective; however the etiology of the improvement following TPE is unknown. Larger studies will help further determine the efficacy of TPE for NSF.

Decoloring hemoglobin as a feedstock for second-generation bioplastics.

The color of red blood cell concentrate (RBCC) limits its application in human food, but there is potential to use it for second-generation bioplastics. Several methods have been developed to remove color from RBCC, but they are expensive or may produce difficult-to-remove toxic residues. Hydrogen peroxide treatment is a cheaper alternative. The effects of RBCC concentration, pH, and reaction temperature were the most important factors influencing the decolorizing process. They were investigated with the aim of developing a method that could be scaled to commercial level for producing a bioplastic feedstock. Initial trials showed pH was an important factor for decolorization and foaming. At pH 15 there was a 96% reduction in solution color and 8.4% solids were lost due to foaming. There was a 76% reduction in solution color at pH 2 and only 2.6% solids were lost due to foaming. The optimal reaction conditions were to centrifuge 9% w/w, pH 2 aqueous RBCC solution to remove aggregates. The solution was reacted at 30°C with 7.5 g of 30% (w/w) hydrogen peroxide. These conditions achieved a 93% reduction in solution color after 3 hr and the molecular weight of the decolored protein was not significantly reduced.

Anesthetic Challenges Posed by Heavy Kratom Users.

Kratom is a herbal and natural dietary supplement from Southeast Asia that is gaining popularity in the United States. Its leaves contain multiple psychoactive chemicals that stimulate opioid, alpha-2, and serotonergic receptors. Kratom is used as a stimulant and in the treatment of anxiety, pain, and opioid withdrawal. In most states, kratom can be purchased legally and is sold at smoke shops, gas stations, and online. To date, only limited data is available on the impact of habitual kratom use on patients undergoing anesthesia. The following case report highlights multiple anesthetic challenges posed by a heavy kratom user.

Clinical and Economic Outcomes Associated With Remote Monitoring for Cardiac Implantable Electronic Devices: A Population-Based Analysis.

BACKGROUND: Despite expert recommendations advocating use of remote monitoring (RM) of cardiac implantable electronic devices, implementation in routine clinical practice remains modest due to inconsistent funding policies across health systems and uncertainty regarding the efficacy of RM to reduce adverse cardiovascular outcomes. METHODS: We conducted a population-based cohort study of patients with de novo implantable cardioverter-defibrillators (ICDs) with or without cardiac resynchronization therapy (CRT-D), using administrative health data in Alberta, Canada, from 2010 to 2016. We assessed RM status as a predictor of all-cause mortality and cardiovascular (CV) hospitalization using Cox proportional hazards modelling, and direct health costs by generalized linear models. From this real-world data, we then constructed a decision-analytic Markov model to estimate the projected costs and benefits associated with RM compared with in-clinic visit follow-up alone. RESULTS: Among 2799 ICD and CRT-D patients, 1830 (63.4%) were followed by RM for a mean follow-up of 50.3 months. After adjustment for age, sex, and comorbidities, RM was associated with a lower risk of death (hazard ratio [HR] 0.43, 95% confidence interval [CI] 0.36-0.52; P < 0.001) and CV hospitalization (HR 0.76, 95% CI 0.64-0.91; P = 0.002). In the economic model, cost savings were observed over 5 years with an estimated savings of $12,195 per person (95% CI -$21,818 to -$4,790). The model estimated a cost-savings associated with RM strategy in 99% of simulations. CONCLUSIONS: These population data support more widespread implementation of RM technology to facilitate better patient outcomes and improve health system efficiency.

Age, Sex, and Remote Monitoring Differences in Device Acceptance for Patients With Implanted Cardioverter Defibrillators in Canada.

BACKGROUND: Implantable cardioverter defibrillator (ICD) acceptance and shock anxiety are issues that clinicians should address to improve quality of life among device recipients. Previous findings have indicated that younger patients experience poorer device adjustment. The purpose of this study was to examine age and ICD-specific quality-of-life outcomes in a large sample of Canadian ICD patients. We tested the hypothesis that patient age is related to device acceptance and shock anxiety in an Alberta (Canada) ICD population. METHODS: The Florida Patient Acceptance Survey (FPAS) and Florida Shock Acceptance Survey (FSAS) were completed by ICD patients attending the Cardiac Implantable Electrical Device Clinics in Alberta. The population was dichotomized into those aged ≤ 65 years (younger) and those aged > 65 years (older). Sex, ICD shock history, and remote monitoring use were also examined. RESULTS: Surveys were completed by 126 younger (53 ± 11 years; 79% male) and 216 older (74 ± 6 years; 85% male) patients. Younger, compared with older, patients had greater device-related distress (P < 0.001) and more body-image concerns (P < 0.001), but no differences in return to function or positive appraisal. Younger patients reported lower total device acceptance (P = 0.001) and greater total shock anxiety (P < 0.001) compared with older patients. CONCLUSIONS: ICD patients aged ≤ 65 years reported poorer device acceptance and greater shock anxiety than older patients. Younger patients may require targeted interventions addressing adjustment to the ICD, and impact of the ICD on body image. Moreover, education about the relatively low probability of shocks may alleviate shock anxiety in younger patients.

CONTEXTE: L'acceptation d'un défibrillateur cardioverteur implantable (DCI) et la crainte des chocs de DCI sont des problèmes auxquels les cliniciens devraient s'attaquer pour améliorer la qualité de vie des patients qui sont porteurs d'un DCI. Selon des observations antérieures, les plus jeunes patients ont davantage de mal à s'adapter au dispositif. L'étude avait pour objet l'examen des paramètres de la qualité de vie particuliers à l'âge et au port d'un DCI dans un vaste échantillon de patients canadiens porteurs de ce dispositif. Nous avons testé l'hypothèse voulant que l'âge du patient soit lié à l'acceptation du dispositif et à la crainte des chocs chez des Albertains porteurs d'un DCI. MÉTHODOLOGIE: Les patients des cliniques de l'Alberta (Canada) des dispositifs cardiaques électroniques implantables qui étaient porteurs d'un DCI ont rempli les questionnaires FPAS (Florida Patient Acceptance Survey) et FSAS (Florida Shock Acceptance Survey). Les patients ont été partagés en deux groupes selon leur âge, soit ceux de 65 ans et moins (plus jeunes patients) et ceux de plus de 65 ans (patients âgés). Nous avons aussi examiné les facteurs suivants : sexe, chocs de DCI antérieurs et utilisation d'une télésurveillance. RÉSULTATS: Les questionnaires ont été remplis par 126 plus jeunes patients (53 ± 11 ans; 79 % d'hommes) et 216 patients âgés (74 ± 6 ans; 85 % d'hommes). Chez les plus jeunes patients, par rapport aux patients âgés, la détresse causée par le dispositif était plus grande (p < 0,001) et il y avait davantage de préoccupations liées à l'image corporelle (p < 0001), mais il n'y avait pas de différences pour ce qui est de la reprise des activités ou de l'évaluation positive du dispositif. Chez les plus jeunes patients, l'acceptation totale du dispositif était moindre (p = 0,001) et la crainte des chocs était plus grande (p < 0,001) que chez les patients âgés. CONCLUSIONS: Chez les porteurs d'un DCI de 65 ans et moins, le dispositif était moins bien accepté, et la crainte des chocs était plus grande que chez les patients âgés. Chez les plus jeunes patients, des interventions ciblées axées sur l'adaptation au DCI et les répercussions du DCI sur l'image corporelle pourraient être nécessaires. De plus, l'éducation à propos de la probabilité relativement faible de subir des chocs pourrait réduire cette crainte chez les plus jeunes patients.

Differential G-alpha interaction capacities of the GoLoco motifs in Rap GTPase activating proteins.

GoLoco motif proteins act as guanine nucleotide dissociation inhibitors (GDIs) for G-protein alpha subunits of the adenylyl cyclase-inhibitory (Galpha(i/o)) class. Rap1GAP2 is a newly identified GoLoco motif- and RapGAP domain-containing protein, and thus is considered a potential integrator of heterotrimeric and monomeric GTPase signaling. Primary sequence analysis indicated that the Rap1GAP2 GoLoco motif contains a lysine (Lys-75), rather than an arginine, at the crucial residue responsible for binding the alpha and beta phosphates of GDP and exerting GDI activity. To determine the functional outcome of this sequence variation we conducted a biophysical analysis of the human Rap1GAP2b/c GoLoco motif. We found that human Rap1GAP2b/c was deficient in GDI activity and Galpha interaction capability. Mutation of lysine-75 to arginine could not regain functional activity of the Rap1GAP2b/c GoLoco motif. Thus, the Rap1GAP2b/c GoLoco motif can be classed as inactive towards Galpha subunits. We also found that the Rap1GAP1a GoLoco motif, which lacks seven N-terminal amino acid residues present in canonical GoLoco motifs, does not interact with Galpha(i1). In contrast, the GoLoco motif of Rap1GAP1b, which is canonical in primary sequence, was found to interact with Galpha(i1).GDP.

Effect of cochlear implantation on nasality in children.

Hypernasality is a commonly perceived characteristic of speech in deaf adults and children, but the mechanism of this abnormal nasal resonance is poorly understood. The impact of cochlear implantation on nasalance measures in children with severe auditory deprivation has not been previously reported. We conducted a study of nasality in 6 deaf children who had undergone cochlear implantation. Voice recordings were obtained before surgery and 6 months after activation of the implants. The MacKay-Kummer SNAP Test--which consists of a syllable-repetition subtest and a picture-cued subtest--was used to obtain nasalance scores for oral (bilabial, alveolar, velar, and sibilant) and nasal phonemes. Before cochlear implantation, mean nasalance scores were significantly higher than normal during the production of oral phonemes for both subtests (p < or = 0.05). Six months after activation, the nasalance measures for all components of the syllable-repetition subtest had been restored to within 1 standard deviation of normal. For all oral phonemes of the picture-cued subtest, the elevated nasalance scores were consistently lower after cochlear implant activation, although the difference was statistically significant only for velar tasks. Nasalance scores for nasal phonemes were within 1 standard deviation of normal both before and after implant activation. Our study showed that cochlear implantation partially corrects elevated nasalance measures. Disturbances in nasal resonance may be caused in part by the inability of deaf speakers to monitor velopharyngeal valving with auditory feedback. The trend toward improved nasalance scores after implantation highlights the role of auditory feedback in monitoring velopharyngeal function. Visual biofeedback may be required to further normalize hypernasal speech in profoundly deaf children.

Multidimensional voice program analysis in profoundly deaf children: quantifying frequency and amplitude control.

Characterization of the vocal profile of profoundly deaf children using an objective voice analysis was carried out in a university-based pediatric otolaryngology clinic. 21 persons ages 3.5 to 18 years were assessed. From each sustained phonation of the vowel /a/ the following acoustic variables were extracted: fundamental frequency (F0), jitter percentage, shimmer percentage, fundamental frequency variation (vF0), peak amplitude variation (vAM), and first, second, and third formant frequencies (F1, F2, F3). Mean F0 was 267.8 Hz and consistent with established normative data. Mean measurements of jitter (0.88%) and shimmer (3.5%) were also within normal limits. The notable feature of the acoustic analysis was a statistically significant elevation in vF0 (2.81%) and vAM (23.58%). With the exception of one subject, the F1, F2, and F3 formant frequencies were comparable to those for normal hearing children. Auditory deprivation results in poor long-term control of frequency and amplitude during sustained phonation. The inability to maintain a sustained phonation may represent the partial collapse of an internal model of voice and speech.

High-speed video or video stroboscopy in adolescents: which sheds more light?

OBJECTIVE: The primary objective of this study was to compare the utility of high-speed video (HSV) to videostroboscopy (VS) in the assessment of adolescents with normal and abnormal larynges. A secondary objective was to evaluate the ease of assessment of adolescents with HSV. STUDY DESIGN: Case series with chart review. SETTING: Tertiary academic health care center. SUBJECTS AND METHODS: This study involved a retrospective review of recordings of 7 adolescents assessed with both HSV and VS. The 14 recordings were randomized and presented to 4 groups of blinded evaluators: 2 fellowship-trained laryngologists, 2 speech language pathologists (SLP) with multiyear experience working in a voice clinic, 2 pediatric otolaryngologists, and 2 otolaryngology residents. Raters were asked to evaluate the videos using a standardized scoring tool. Raters also completed a questionnaire assessing their opinion of the HSV and VS recordings. RESULTS: Evaluators required more time to complete their assessment of VS recordings (2.95 min ± 2.41 min) than HSV recordings (2.31 min ± 1.92 min) (P = .004). There was no difference in ease of evaluation (P = .878) or diagnostic accuracy within evaluator groups by recording modality (P = .5). The overall agreement between VS and HSV was moderate (kappa [SE] = 0.446 [0.029]). The debrief questionnaire revealed that 5 of 8 (62.5%) preferred VS to HSV. CONCLUSION: This is the first comparative study between HSV and VS in patients under 18 years of age. HSV permitted faster evaluation than VS, but there was no difference in diagnostic accuracy between the 2 modalities. The evaluators preferred VS to HSV.

Canadian Cardiovascular Society guidelines on the use of cardiac resynchronization therapy: implementation.

Recent studies have provided the impetus to update the recommendations for cardiac resynchronization therapy (CRT). This article provides guidance on the implementation of CRT and is intended to serve as a framework for the implementation of CRT within the Canadian health care system and beyond. These guidelines were developed through a critical evaluation of the existing literature, and expert consensus. The panel unanimously adopted each recommendation. The 9 recommendations relate to patient selection in the presence of comorbidities, delivery and optimization of CRT, and resources required to deliver this therapy. The strength of evidence was weighed, taking full consideration of any risk of bias, and any imprecision, inconsistency, and indirectness of the available data. The strength of each recommendation and the quality of evidence were adjudicated. Trade-offs between desirable and undesirable consequences of alternative management strategies were considered, as were values, preferences, and resource availability. These guidelines were externally reviewed by experts, modified based on those reviews, and will be updated as new knowledge is acquired.